TECHNICAL MANUAL
MAIN/ALTERNATE
CONTROLLER
992 9785 001/003/004
988-2337-001
T.M. No. 888-2337-001
October 14, 1998
© Copyright HARRIS CORPORATION
1992, 1994, 1998 All Rights Reserved
Returns And Exchanges
Damaged or undamaged equipment should not be returned unless written approval
and a Return Authorization is received from HARRIS CORPORATION, Broadcast
Systems Division. Special shipping instructions and coding will be provided to assure proper handling. Complete details regarding circumstances and reasons for
return are to be included in the request for return. Custom equipment or special
order equipment, that is not defective, is not returnable. In those instances where
return or exchange of equipment is at the request of the customer, or convenience
of the customer, a restocking fee will be charged. All returns will be sent freight
prepaid and properly insured by the customer. When communicating with HARRIS
CORPORATION, Broadcast Systems Division, specify the HARRIS Order Number
or Invoice Number.
Unpacking
Carefully unpack the equipment and preform a visual inspection to determine that
no apparent damage was incurred during shipment. Retain the shipping materials
until it has been determined that all received equipment is not damaged. Locate
and retain all PACKING CHECK LISTs. Use the PACKING CHECK LIST to help
locate and identify any components or assemblies which are removed for shipping
and must be reinstalled. Also remove any shipping supports, straps, and packing
materials prior to initial turn on.
Technical Assistance
HARRIS Technical and Troubleshooting assistance is available from HARRIS Field
Service during normal business hours (8:00 AM - 5:00 PM Central Time). Emergency service is available 24 hours a day. Telephone 217/222-8200 to contact the
Field Service Department or address correspondence to Field Service Department,
HARRIS CORPORATION, Broadcast Systems Division, P.O. Box 4290, Quincy, Illinois 62305-4290, USA. The HARRIS factory may also be contacted through a FAX
facility (217/221-7096).
Replaceable Parts Service
Replacement parts are available 24 hours a day, seven days a week from the
HARRIS Service Parts Department. Telephone 217/222-8200 to contact the service
parts department or address correspondence to Service Parts Department, HARRIS CORPORATION, Broadcast Systems Division, P.O. Box 4290, Quincy, Illinois
62305-4290, USA. The HARRIS factory may also be contacted through a FAX facility (217/221-7096) or e-mail at TSUPPORT@HARRIS.COM.
NOTE
The # symbol used in the parts list means used with (e.g. #C001 = used with C001).
Guide to Using Harris Parts List Information
The Harris Replaceable Parts List Index portrays a tree structure with the major items being leftmost in the index.
The example below shows the Transmitter as the highest item in the tree structure. If you were to look at the bill of
materials table for the Transmitter you would find the Control Cabinet, the PA Cabinet, and the Output Cabinet. In
the Replaceable Parts List Index the Control Cabinet, PA Cabinet, and Output Cabinet show up one indentation level
below the Transmitter and implies that they are used in the Transmitter. The Controller Board is indented one level
below the Control Cabinet so it will show up in the bill of material for the Control Cabinet. The tree structure of this
same index is shown to the right of the table and shows indentation level versus tree structure level.
Example of Replaceable Parts List Index and equivalent tree structure:
The part number of the item is shown to the right of the description as is the page in the manual where the bill for
that part number starts.
Inside the actual tables, four main headings are used:
Table #-#. ITEM NAME - HARRIS PART NUMBER - this line gives the information that corresponds to the
Replaceable Parts List Index entry;
HARRIS P/N column gives the ten digit Harris part number (usually in ascending order);
DESCRIPTION column gives a 25 character or less description of the part number;
REF. SYMBOLS/EXPLANATIONS column 1) gives the reference designators for the item (i.e., C001, R102,
etc.) that corresponds to the number found in the schematics (C001 in a bill of material is equivalent to C1 on the
schematic) or 2) gives added information or further explanation (i.e., “Used for 208V operation only,” or “Used
for HT 10LS only,” etc.).
Inside the individual tables some standard conventions are used:
A # symbol in front of a component such as #C001 under the REF. SYMBOLS/EXPLANATIONS column means
that this item is used on or with C001 and is not the actual part number for C001.
In the ten digit part numbers, if the last three numbers are 000, the item is a part that Harris has purchased and
has not manufactured or modified. If the last three numbers are other than 000, the item is either manufactured by
Harris or is purchased from a vendor and modified for use in the Harris product.
The first three digits of the ten digit part number tell which family the part number belongs to - for example, all
electrolytic (can) capacitors will be in the same family (524 xxxx 000). If an electrolytic (can) capacitor is found
to have a 9xx xxxx xxx part number (a number outside of the normal family of numbers), it has probably been
modified in some manner at the Harris factory and will therefore show up farther down into the individual parts
list (because each table is normally sorted in ascending order). Most Harris made or modified assemblies will
have 9xx xxxx xxx numbers associated with them.
The term “SEE HIGHER LEVEL BILL” in the description column implies that the reference designated part
number will show up in a bill that is higher in the tree structure. This is often the case for components that may
be frequency determinant or voltage determinant and are called out in a higher level bill structure that is more
customer dependent than the bill at a lower level.
2-02-93
WARNING
THE CURRENTS AND VOLTAGES IN THIS EQUIPMENT ARE DANGEROUS. PERSONNEL MUST AT ALL TIMES OBSERVE SAFETY WARNINGS, INSTRUCTIONS
AND REGULATIONS.
This manual is intended as a general guide for trained and qualified personnel who are aware of the dangers inherent in
handling potentially hazardous electrical/electronic circuits. It is not intended to contain a complete statement of all safety
precautions which should be observed by personnel in using this or other electronic equipment.
The installation, operation, maintenance and service of this equipment involves risks both to personnel and equipment, and
must be performed only by qualified personnel exercising due care. HARRIS CORPORATION shall not be responsible for
injury or damage resulting from improper procedures or from the use of improperly trained or inexperienced personnel
performing such tasks.
During installation and operation of this equipment, local building codes and fire protection standards must be observed.
The following National Fire Protection Association (NFPA) standards are recommended as reference:
- Automatic Fire Detectors, No. 72E
- Installation, Maintenance, and Use of Portable Fire Extinguishers, No. 10
- Halogenated Fire Extinguishing Agent Systems, No. 12A
WARNING
ALWAYS DISCONNECT POWER BEFORE OPENING COVERS, DOORS, ENCLOSURES, GATES, PANELS OR SHIELDS. ALWAYS USE GROUNDING STICKS AND
SHORT OUT HIGH VOLTAGE POINTS BEFORE SERVICING. NEVER MAKE INTERNAL ADJUSTMENTS, PERFORM MAINTENANCE OR SERVICE WHEN ALONE
OR WHEN FATIGUED.
Do not remove, short-circuit or tamper with interlock switches on access covers, doors, enclosures, gates, panels or shields.
Keep away from live circuits, know your equipment and don’t take chances.
WARNING
IN CASE OF EMERGENCY ENSURE THAT POWER HAS BEEN DISCONNECTED.
WARNING
IF OIL FILLED OR ELECTROLYTIC CAPACITORS ARE UTILIZED IN YOUR
EQUIPMENT, AND IF A LEAK OR BULGE IS APPARENT ON THE CAPACITOR
CASE WHEN THE UNIT IS OPENED FOR SERVICE OR MAINTENANCE, ALLOW
THE UNIT TO COOL DOWN BEFORE ATTEMPTING TO REMOVE THE DEFECTIVE CAPACITOR. DO NOT ATTEMPT TO SERVICE A DEFECTIVE CAPACITOR
WHILE IT IS HOT DUE TO THE POSSIBILITY OF A CASE RUPTURE AND SUBSEQUENT INJURY.
11-21-94
888-2337-001
WARNING: Disconnect primary power prior to servicing.
i
ii
888-2337-001
WARNING: Disconnect primary power prior to servicing.
11-21-94
FIRST-AID
Personnel engaged in the installation, operation, maintenance or servicing of this equipment are urged to become familiar
with first-aid theory and practices. The following information is not intended to be complete first-aid procedures, it is a
brief and is only to be used as a reference. It is the duty of all personnel using the equipment to be prepared to give
adequate Emergency First Aid and thereby prevent avoidable loss of life.
Treatment of Electrical Burns
1.
Extensive burned and broken skin
a.
Cover area with clean sheet or cloth. (Cleanest available cloth article.)
b.
Do not break blisters, remove tissue, remove adhered particles of clothing, or apply any salve or ointment.
c.
Treat victim for shock as required.
d.
Arrange transportation to a hospital as quickly as possible.
e.
If arms or legs are affected keep them elevated.
NOTE
If medical help will not be available within an hour and the victim is
conscious and not vomiting, give him a weak solution of salt and soda:
1 level teaspoonful of salt and 1/2 level teaspoonful of baking soda to
each quart of water (neither hot or cold). Allow victim to sip slowly
about 4 ounces (a half of glass) over a period of 15 minutes. Discontinue fluid if vomiting occurs. (Do not give alcohol.)
2.
Less severe burns - (1st & 2nd degree)
a.
Apply cool (not ice cold) compresses using the cleanest available cloth article.
b.
Do not break blisters, remove tissue, remove adhered particles of clothing, or apply salve or ointment.
c.
Apply clean dry dressing if necessary.
d.
Treat victim for shock as required.
e.
Arrange transportation to a hospital as quickly as possible.
f.
If arms or legs are affected keep them elevated.
REFERENCE:
ILLINOIS HEART ASSOCIATION
AMERICAN RED CROSS STANDARD FIRST AID AND PERSONAL SAFETY MANUAL (SECOND EDITION)
11-21-94
888-2337-001
WARNING: Disconnect primary power prior to servicing.
iii
Table of Contents
Section I
Introduction/Specifications
Scope And Purpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main/Alternate Exciter Controller . . . . . . . . . . . . . . . . . .
Main/Alternate Transmitter Controller. . . . . . . . . . . . . . .
Operating Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section II
Installation/Initial Turn-On
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delivery and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Returns And Exchanges . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation/Initial Turn-On. . . . . . . . . . . . . . . . . . . . . . . . . .
Main/Alternate Exciter Controller . . . . . . . . . . . . . . . . . . . .
Configuration Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . .
JP2 - JP5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exciter Interconnections . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial Turn-On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Input Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying Proper AC voltage selection . . . . . . . . . .
Verifying AC input voltage . . . . . . . . . . . . . . . . . . .
Sensitivity Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main/Alternate Transmitter Controller Installation . . . . . . .
Configuration Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . .
JP2 - JP5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JP15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JP11 - JP14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JP16 - JP19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JP22, JP23, JP25, JP39 . . . . . . . . . . . . . . . . . . . . . . .
JP24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JP31, JP32, JP37, JP41, JP43, JP45 . . . . . . . . . . . . .
JP30, JP33, JP34, JP40, JP42, JP44 . . . . . . . . . . . . .
JP35, JP36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JP38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JP46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JP47, JP48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter Connections . . . . . . . . . . . . . . . . . . . . . . . . . .
Main/Alternate Low Power Transmitter Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filament Off/Plate Off/Plate On . . . . . . . . . . . . . . . .
External Interlocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Antenna/Station Load Interlocks . . . . . . . . . . . . . . .
External Coaxial Transfer Switch . . . . . . . . . . . . . . . . . .
Initial Turn-On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv
1-1
1-1
1-1
1-1
1-1
1-1
1-2
1-2
1-2
1-2
1-2
1-2
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-2
2-2
2-2
2-2
2-2
2-2
2-2
2-2
2-3
2-3
2-3
2-4
2-4
2-4
2-4
2-4
2-4
2-4
2-4
2-4
2-4
2-5
2-5
2-5
2-5
2-5
2-5
2-5
2-6
2-6
2-6
2-6
Sensitivity Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auxiliary Relay Contacts . . . . . . . . . . . . . . . . . . . . . . . . . .
Extended/Remote Control Connections . . . . . . . . . . . . . . .
Control Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-6
2-6
2-7
2-7
2-7
2-7
Section III
Operators Guide
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main/Alternate Exciter Controller Operations . . . . . . . . . .
Transmitter RF Mute Not Connected . . . . . . . . . . . . . . .
Transmitter RF Mute Connected. . . . . . . . . . . . . . . . . . .
Selecting An Exciter For Operation . . . . . . . . . . . . . . . .
Exciter Automatic Switching . . . . . . . . . . . . . . . . . . . . .
Main/Alternate Transmitter Controller Operations . . . . . .
Low Power Solid State Transmitter Controller . . . . . . .
Selecting A Transmitter For Operation . . . . . . . . . . . . .
Transmitter Automatic Switching . . . . . . . . . . . . . . . . . .
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-2
Section IIIA
Controls And Indicators
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Section IV
Overall System Theory
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram Description - Main/Alternate Exciter
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Mode Of Operation . . . . . . . . . . . . . . . . . . . . . .
Automatic Mode Of Operation . . . . . . . . . . . . . . . . . . . .
Block Diagram Description - Main/Alternate Transmitter Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Mode Of Operation . . . . . . . . . . . . . . . . . . . . . .
Automatic Mode Of Operation . . . . . . . . . . . . . . . . . . . .
Detailed Circuit Description - Main/Alternate Exciter
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Mode Of Operation . . . . . . . . . . . . . . . . . . . . . .
Input Gating And Coding . . . . . . . . . . . . . . . . . . . .
TX Off Delay Timer U15-5. . . . . . . . . . . . . . . . . . .
Clock Pulse Generator U15-9 . . . . . . . . . . . . . . . . .
Flip-Flops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Position Status/Indicators. . . . . . . . . . . . . . . . . . . . .
RF Mute Control Relays . . . . . . . . . . . . . . . . . . . . .
Auxiliary Relays . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coax Switch Timer U20-9. . . . . . . . . . . . . . . . . . . .
Plate On Pulse Generator U20-5 . . . . . . . . . . . . . . .
Clock Pulse Generator . . . . . . . . . . . . . . . . . . . . . . .
Normal/Test Switch . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Mode Switching . . . . . . . . . . . . . . . . . . . . . .
Auto/Manual Latching Relay . . . . . . . . . . . . . . . . .
Comparators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auto-Manual Gates . . . . . . . . . . . . . . . . . . . . . . . . .
TX Overload Recovery Timer U7-5 . . . . . . . . . . . .
Switch Enable Pulse Generator U7-9 . . . . . . . . . . .
Switch To Manual Mode . . . . . . . . . . . . . . . . . . . . .
Switch Alarm Latch . . . . . . . . . . . . . . . . . . . . . . . . .
888-2337-001
WARNING: Disconnect primary power prior to servicing.
4-1
4-3
4-3
4-3
4-5
4-5
4-5
4-6
4-6
4-6
4-6
4-6
4-6
4-6
4-6
4-6
4-6
4-7
4-7
4-7
4-7
4-7
4-7
4-8
4-8
4-8
4-8
4-8
4-8
11-21-94
Detailed Circuit Description - Main/Alternate Transmitter Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Manual Mode Of Operation . . . . . . . . . . . . . . . . . . . . . . 4-8
Input Gating And Coding . . . . . . . . . . . . . . . . . . . . 4-8
Plate Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
TX Off Delay Timer U15-5. . . . . . . . . . . . . . . . . . . 4-9
Clock Pulse Generator U15-9 . . . . . . . . . . . . . . . . . 4-9
Flip-Flops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Output Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Position Status/Indicators. . . . . . . . . . . . . . . . . . . . . 4-9
Auxiliary Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Coax Switch Timer U20-9. . . . . . . . . . . . . . . . . . . . 4-9
Plate On Pulse Generator U20-5 . . . . . . . . . . . . . . . 4-9
Clock Pulse Generator . . . . . . . . . . . . . . . . . . . . . . . 4-9
Automatic Mode Switching . . . . . . . . . . . . . . . . . . . . . . 4-9
Auto/Manual Latching Relay . . . . . . . . . . . . . . . . . 4-9
Comparators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Auto-Manual Gates . . . . . . . . . . . . . . . . . . . . . . . . 4-11
TX Overload Recovery Timer U7-5 . . . . . . . . . . . 4-11
Standby Transmitter Plate On Generator U335 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Switch Enable Pulse Generator U7-9 . . . . . . . . . . 4-11
Plate On Pulse Generator U20-5 . . . . . . . . . . . . . . 4-11
Coax Switch Delay Timer . . . . . . . . . . . . . . . . . . . 4-11
Filament Off Pulse Generator . . . . . . . . . . . . . . . . 4-11
Switch To Manual Mode . . . . . . . . . . . . . . . . . . . . 4-11
Switch Alarm Latch . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Display Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Interconnection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
AC Restart Time Delay Relays. . . . . . . . . . . . . . . . . . . 4-12
AC Power Fail Reset Relay K1. . . . . . . . . . . . . . . 4-12
AC Power Fail Inhibit Time Delay Relay K2 . . . 4-12
Section V
Maintenance/Alignments
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Station Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter Logbook . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Logbook . . . . . . . . . . . . . . . . . . . . . . . . . . .
11-21-94
5-1
5-1
5-1
5-1
5-1
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Of Components. . . . . . . . . . . . . . . . . . . . . .
Semiconductors. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fixed Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printed-Circuit Boards . . . . . . . . . . . . . . . . . . . . . . .
Corrective Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main/Alternate Exciter Controller Adjustments . . . . . . . . .
Sensitivity Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main/Alternate Transmitter Controller Adjustments . . . . .
Sensitivity Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1
5-1
5-1
5-1
5-2
5-2
5-2
5-2
5-2
5-2
5-2
5-2
5-3
5-3
5-3
Section VA
Views
Section VI
Troubleshooting
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specific Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . .
No Front Panel LEDs Illuminated . . . . . . . . . . . . . . . . . .
Controller Does Not Switch Correctly In The AUTO
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller Switches To The Other Unit When
Placed In The AUTO Mode . . . . . . . . . . . . . . . . . . . . . .
Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-1
6-1
6-1
6-1
6-1
6-1
6-1
Section VIA
Emergency Operating Procedures
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Incorrect AUTO Mode Operation . . . . . . . . . . . . . . . . . . 6-1
Complete Unit Bypassing . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Section VII
Parts List
Section VIII
Drawings
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Section I
Introduction/Specifications
1.1 Scope And Purpose
This technical manual contains the information necessary to
install and maintain the MAIN/ALTERNATE CONTROLLER.
The manual is conveniently divided into the following sections:
• SECTION I, INTRODUCTION/SPECIFICATIONS. Pro•
•
•
•
•
•
•
•
•
•
vides general manual layout, equipment purpose, system
block diagrams, and specifications.
SECTION II, INSTALLATION/INITIAL TURN-ON. Provides detailed installation procedures and initial turn on
instructions.
SECTION III, OPERATORS GUIDE. Provides a description of the normal operation of the unit using the front panel
controls and indicators.
SECTION III-A, CONTROLS/INDICATORS. Provides
identification and functions of all external panel controls
and indicators.
SECTION IV, OVERALL SYSTEM THEORY. Provides
block diagram and detailed theory of operation of the
controller unit and various sections that apply to the overall
system.
SECTION V, MAINTENANCE/ALIGNMENTS. Provides preventive and corrective maintenance information in
addition to alignment procedures.
SECTION V-A, VIEWS. Provides drawings that show the
location of major components and assemblies in the controller.
SECTION VI, TROUBLESHOOTING. Provides general
information for troubleshooting.
SECTION VI-A, EMERGENCY OPERATING PROCEDURES. Provides methods to maintain on-air operation of
the system in the event of a failure.
SECTION VII, PARTS LIST. Provides a parts list for the
entire assembly.
SECTION VIII, DRAWINGS. Provides a list of the drawings in the drawing package.
1.2 Equipment Purpose
The Main/Alternate Controller may be used in many different
applications with many different Harris and non-Harris products.
This technical manual is primarily concerned with the unit
operating in one of the following modes:
1.2.1 Main/Alternate Exciter Controller
Main/Alternate exciter or low power solid state transmitter
switching utilizing an internally mounted coaxial transfer switch
for power levels up to 1000 W.
1.2.2 Main/Alternate Transmitter Controller
Main/Alternate transmitter switching utilizing solid-state or tube
type transmitters with an external motorized coaxial transfer
switch for power levels above 1000 W.
1.3 Operating Modes
In either of the above applications, the Main/Alternate Controller
may be operated in the AUTOMATIC or MANUAL mode. Front
panel selector switches are used to select between the two modes
of operation.
1.3.1 Manual Mode
In the manual mode of operation, the controller allows the user
to change events manually providing additional flexibility of
operation.
With an exciter controller, if exciter A is on the air and the B AIR
switch is depressed - the controller will switch to the B exciter
and place it on air. The output of exciter A will be connected to
the station load. The controller will apply an rf mute to exciter
A, however for troubleshooting purposes the rf mute may be
released by moving the NORMAL/TEST switch to the TEST
position.
With a transmitter controller, if transmitter A is on the air and the
B AIR switch is depressed - the controller will turn off transmitter
A and switch the transmitter B rf output to the antenna. However,
the controller will not turn on transmitter B. This must be done
manually, allowing the user to activate transmitter B at any time
Figure 1-1. Main/Alternate Controller
09-08-04
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WARNING: Disconnect primary power prior to servicing.
1-1
desired. The output of transmitter A will be connected to the
station load, and may be serviced at any time.
1.3.2 Automatic Mode
In the Automatic mode of operation, if the power output of the
selected unit (main or alternate) is reduced below a user set
threshold, then the controller will automatically switch to the
other unit and place it on the air. After the switch has taken place,
the controller will switch itself to the manual mode of operation.
This will prevent the controller from trying to switch back to the
faulty unit.
1.4 System Block Diagram
System Block Diagrams appear on the next page, for a block
diagram description and detailed explanation refer to Section IV,
Overall System Theory.
rack panel enclosure. Switches and status indicators are provided
on the front panel. Connectors are provided on the rear panel for
system interconnection as well as ancillary system connections
and remote control.
1.6 Specifications
NOTE
Specifications subject to change without notice.
1.6.1 Electrical
AC mains requirement: 115/230 Vac +/- 10%, 50/60 Hz, 1
Phase at 40 Watts.
1.6.2 Physical
Size: 19" EIA rack mounted enclosure 3-1/2" high x 12"
deep
Weight: 9.5 pounds
Color: Black with white lettering standard, Platinum with
black lettering available upon request.
1.5 Physical Description
The Main/Alternate Controller consists of a two printed-circuit
board assemblies mounted in a 3-1/2-inch standard 19 inch EIA
1-2
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11-18-94
Figure 1-2. Block Diagram Main/Alternate
Exciter Controller
Figure 1-3. Block Diagram Main/Alternate
Transmitter or Exciter Controller
11-18-94
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1-3
1-4
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11-18-94
Section II
Installation/Initial Turn-On
2.1 Introduction
2.6 Main/Alternate Exciter Controller
This section provides information and instructions necessary for
the installation and initial turn-on of the Main/Alternate Controller. This section is primarily concerned with the configuration
jumpers and interconnect wiring, refer to the exciter or transmitter technical manuals as required.
Prior to the electrical turn-on and operation of the controller, one
configuration jumper may have to be selected and the unit will
have to be electrically connected to the exciters. If it is part of a
system package, this will already be set for the fastest time
possible. If the unit is received as a stand-alone, it likely will not
have any jumpers set. They are supplied in a separate bag.
2.2 Delivery and Storage
The controller is normally delivered in a cardboard carton. Any
obvious damage should be noted at the time of receipt and claims
filed with the carrier. Extreme care should be taken during the
unloading operation to prevent injury to personnel or damage to
the equipment. If the unit is to be temporarily stored, inside
storage is required. Do not stack items on top of the cardboard
carton.
2.3 Returns And Exchanges
Damaged or undamaged equipment should not be returned unless a written Return Authorization is issued. When communicating with Harris Corporation, Broadcast Division, specify the
order number or invoice number. Include complete details regarding circumstances and reasons for return in the request.
Custom equipment or special order equipment is not returnable.
In instances where return or exchange of equipment is at the
request or convenience of the customer, a restocking fee will be
charged. Special shipping instructions and coding will be provided to insure proper handling. All returns will be sent freight
prepaid and properly insured by the customer.
WARNING
CHANGING JUMPER POSITIONS REQUIRES GAINING ACCESS
TO THE INSIDE OF THE CONTROLLER UNIT. FOLLOW PROPER
SAFETY PRECAUTIONS AS 110 VAC OR 220 VAC WILL BE
PRESENT INSIDE THE UNIT WHEN IT IS PLUGGED INTO THE AC
MAINS SUPPLY. UNPLUG THE AC LINE CORD FROM THE
POWER MAINS BEFORE ANY SERVICING IS ATTEMPTED.
ONCE POWER IS REMOVED, PLACE THE UNIT ON A SUITABLE
WORK SURFACE AND REMOVE THE SCREWS SECURING THE
TOP COVER. REMOVE THE COVER AND USING A TEST LEAD
CONNECT ONE END OF THE LEAD TO THE CONTROLLER
CHASSIS AND USING THE OTHER END, GROUND THE + TERMINAL OF CAPACITOR C93 LOCATED BETWEEN THE FRONT
PANEL AND THE CUTOUT FOR T1. THIS WILL ENSURE ALL DC
VOLTAGE IS REMOVED FROM THE CONTROLLER BOARD.
2.6.1 Configuration Jumpers
The controller may be configured as a main/alternate exciter or
main/alternate transmitter controller. The configuration process
involves positioning internal jumper selectors. Table 2-1 at the
end of this section lists all of the jumper positions required for
operation as a main/alternate exciter controller. The only jumper
that needs to be selected is JP2 - JP5.
NOTE
It is recommended that when this jumper has been correctly selected, the position is written in the blank space provided on Table 2-1 for future reference.
2.4 Unpacking
Carefully unpack the unit and save all packing material. Inspect
thoroughly for any damage incurred in shipment. Retain all
PACKING CHECK LISTS to locate and identify any components or assemblies removed for shipping.
2.5 Installation/Initial Turn-On
Following is a list of the major topics in this section:
• Main/Alternate Exciter Controller Installation and Initial
Turn-On
• Main/Alternate Transmitter Controller Installation and In-
itial Turn-On
• Auxiliary Contact Connections
• Remote/Extended Control
08-30-95
NOTE
Refer to Section VA, VIEWS for a drawing of the physical location of the configuration jumpers.
2.6.1.1 JP2 - JP5
Sets the amount of time allowed for recovery of the main exciter
before a switch to the alternate unit is initiated in the AUTOMATIC mode. There is only one jumper that must be installed into
either JP2, JP3, JP4, or JP5 and the table lists the timeout for each
jumper.
For example, the main exciter goes out of lock, the exciter rf
mutes itself, then returns to a locked condition. The exciter may
delay releasing its internal rf mute by 5 seconds. Assume that this
process takes 8 seconds.
If it is desired to begin to switch to the alternate exciter before
the main exciter releases the rf mute, then the timeout should be
set shorter than the 8 second recovery time and the jumper should
be installed into JP2 (2.0S).
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WARNING: Disconnect primary power prior to servicing.
2-1
If it is desired to allow the main exciter the opportunity to recover
to see if it will return back to normal operation, then the timeout
should be set longer than the 8 second recovery time and the
jumper should be installed into JP4 (9.1S) or JP5 (27S). If at the
end of the selected timeout, the main exciter has not returned to
an allowable power output level then the switch to the alternate
unit will begin.
1. Connect J2-6 and J2-13 to the rf mute input from exciter
A.
2. Connect J3-6 and J3-13 to the rf mute input from exciter
B.
If it is desired to automatically mute the exciter when the transmitter is turned off, then route the mute line from the transmitter
to the ON-AIR exciter:
2.6.2 Exciter Interconnections
The following lists the electrical connections to/from the controller, refer to Drawing 839-8118-399 sheet 2 in the drawing
package for more details.
3. Connect the exciter mute from the transmitter to J8-20.
NOTE
This procedure assumes that the optional internally mounted coaxial transfer switch (Harris Part Number 992-8602-001) has
been installed in the Main/Alternate Controller. If an external
coaxial transfer switch is used, refer to the transmitter controller
section (discussed later) for more configuration information.
2.6.2.1 RF Output
The internally mounted coaxial transfer switch allows the rf
signal from the on air exciter to be routed to the transmitter rf
input while the off air exciter is connected to a low power external
load. The internal coax transfer switch is connected to the controller at J11. The four type “N” input/output connectors are
accessible through the rear panel of the controller.
1. Connect the rf output from exciter A to J2.
2. Connect the rf output from exciter B to J3.
3. Connect the external load to J4. This load must be
capable of safely dissipating more power rf power than
is capable from any one exciter.
4. Connect the transmitter rf input to J1.
2.6.2.2 RF Sample
Typically an exciter will contain a remote forward power sample
output that is a dc voltage proportional to the forward power
output. This dc voltage sample will be used to determine when
an exciter has failed and the controller needs to switch to the
alternate unit. If the exciter does not have a remote sample output,
a detector of some fashion will need to be installed.
1. Connect the remote forward power sample from exciter
A to J10 on the rear of the controller.
2. Connect the remote forward power sample from exciter
B to J5 on the rear of the controller.
2.6.2.3 RF Mute
The exciter must be compatible with the ground to mute format
as employed in the MS/MX15 exciter or as selectable in the
THE-1 and DIGIT exciters.
If it is acceptable to have the on air exciter unmuted at all times
then only the mute line connections from the controller to the
exciters need to be completed. In this configuration, the off air
exciter is muted by the controller, and for test purposes can be
unmuted by moving the rear panel switch, S1 to the TEST
position. This will remove the ground connection from the off
air exciter mute line.
2-2
2.7 Initial Turn-On
The Main/Alternate Controller may be set up for exciter switching as follows:
2.7.1 AC Input Wiring
The AC connection is made at the rear of the Controller via a
standard three prong connector. The ac input voltage is selectable
at 100, 120, 220, or 240Vac. The tag located on the rear panel
indicates the input voltage configuration of the Controller at the
time of shipment. THE AC VOLTAGE THAT THE CONTROLLER WILL BE OPERATED AT MUST BE VERIFIED PRIOR TO EQUIPMENT ENERGIZING AT THE
USER LOCATION TO PREVENT DAMAGE OR IMPROPER OPERATION OF THE CONTROLLER. To wire
the input of the Controller, refer to the following application
notes:
2.7.1.1 Verifying Proper AC voltage selection
CAUTION
CONTROLLER DAMAGE OR IMPROPER OPERATION WILL OCCUR IF THE CONTROLLER AC INPUT IS NOT SET TO MATCH THE
INCOMING AC INPUT VOLTAGE. BEFORE INSERTING THE AC
PLUG INTO THE CONTROLLER, VERIFY THAT THE AC INPUT
VOLTAGE MATCHES THAT WHICH THE CONTROLLER IS SELECTED TO ACCEPT.
IF THE AC VOLTAGE RANGE IS CHANGED VERIFY THAT THE
PROPER SIZE INPUT FUSE F1, HAS BEEN INSTALLED. CONTROLLER DAMAGE OR IMPROPER OPERATION COULD OCCUR
IF THE WRONG FUSE IS INSTALLED.
2.7.1.2 Verifying AC input voltage
The ac input voltage to the Controller should be verified before
the Controller is plugged into the ac line, and that the ac input
connector is set to the proper range. The ac input connector block
contains the input line fuse and the selector card for setting the
ac input voltage. See Figure 1-1 to determine the proper voltage
range selection for the actual voltage measured. To change the ac
input voltage range perform the following steps.
a. Remove the ac input line cord if installed
b. Slide the plastic cover door to the left, exposing the input
fuse and selector card.
c. Rotate fuse pull lever to the left and remove the fuse.
d. Remove the voltage selector card by pulling straight out.
Putting a loop of wire through the hole in the card and
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WARNING: Disconnect primary power prior to servicing.
08-30-95
6. Adjust the A SENSE control on the front panel clockwise until the indicator above the control illuminates.
7. Slowly adjust the A SENSE control counterclockwise
to the point where the indicator extinguishes and stop.
This is the point at which the controller will switch
exciters.
8. Increase the rf output level of exciter A until the indicator illuminates.
9. Slowly decrease the rf output level of exciter A and
check the switch-over point. Return exciter A back to
normal power output.
10. Depress the B AIR pushbutton switch on the controller.
11. Repeat the above steps using exciter B, the B SENSE
control, and the B SENSE indicator.
Figure 2-1. AC Input Voltage Selection Chart
pulling the wire with a pair of needle nose pliers will help
in the removal.
e. Select the proper operating voltage by orientating the card
to the position at which the desired voltage range numbers
appear on the top left side of the board.
f. Push board firmly into the module slot and note that the
desired voltage range numbers are clearly visible. Rotate
the fuse pull lever back to the normal position.
g. Verify that the fuse is the proper amperage and type(1A
fast blow), then reinsert into the fuse holder.
Slide the cover back over the fuse.
2.7.2 Sensitivity Adjustments
1. Apply power to the controller by inserting the ac power
cord into the socket on the rear panel.
2. Depress the MANUAL switch on the front panel and
verify that the indicator above the switch becomes
illuminated.
3. Depress the A AIR switch on the front panel and verify
that the indicator above the switch becomes illuminated.
4. Turn on exciter A and slowly increase the rf power while
verifying that the transmitter is receiving rf drive. Stop
increasing the power output when 100% of normal rf
drive to the transmitter is reached.
5. Decrease the rf output level of exciter A to the point
where it is desired to automatically switch to the alternate exciter.
NOTE
The point at which the controller switches exciters is totally at
the discretion of the operator. It should be noted that exciter failure is likely to be total compared to transmitter failures, in that
the exciter will probably cease to produce rf rather than slowly
drop in output level. It is suggested that the trip point be set at
approximately 50% of the normal exciter rf output operating
level.
08-30-95
2.7.3 Automatic Switching
1. Operate exciter A at 100% power with the controller in
the MANUAL and A AIR modes. Verify A SENSE LED
is illuminated.
2. Depress the AUTO switch on the front panel and verify
that the indicator above the switch becomes illuminated.
3. Lower the power output of exciter A below the sensitivity threshold. The A AIR SENSE LED should be
extinguished.
4. After the recovery timer times out, verify that the controller applies an rf mute to both exciters and switches
the output of exciter B to the transmitter rf input.
5. The controller should release the rf mute for exciter B
and maintain the rf mute to exciter A.
6. Verify that the controller switches itself to the MANUAL mode.
7. The red SWITCH ALARM LED should now be illuminated indicating a switch has occurred.
8. The B SENSE LED should now be illuminaetd.
9. To repeat the above steps using exciter B, return to step 2.
10. This completes the exciter automatic switching setup
procedures.
2.8 Main/Alternate Transmitter Control-
ler Installation
Prior to the electrical turn-on and operation of the controller, the
unit will have to be electrically connected to the transmitters,
external coaxial transfer switch, antenna interlock (if used),
station load interlock (if used) and several configuration jumpers
will have to be selected.
NOTE
Refer to Section VA, VIEWS for a drawing of the physical location of the configuration jumpers.
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WARNING: Disconnect primary power prior to servicing.
2-3
WARNING
CHANGING JUMPER POSITIONS REQUIRES GAINING ACCESS
TO THE INSIDE OF THE CONTROLLER UNIT. FOLLOW PROPER
SAFETY PRECAUTIONS AS 110 VAC OR 220 VAC WILL BE
PRESENT INSIDE THE UNIT WHEN IT IS PLUGGED INTO THE AC
MAINS SUPPLY. UNPLUG THE AC LINE CORD FROM THE
POWER MAINS BEFORE ANY SERVICING IS ATTEMPTED.
ONCE POWER IS REMOVED, PLACE THE UNIT ON A SUITABLE
WORK SURFACE AND REMOVE THE SCREWS SECURING THE
TOP COVER. REMOVE THE COVER AND USING A TEST LEAD
CONNECT ONE END OF THE LEAD TO THE CONTROLLER
CHASSIS AND USING THE OTHER END, GROUND THE + TERMINAL OF CAPACITOR C93 LOCATED BETWEEN THE FRONT
PANEL AND THE CUTOUT FOR T1. THIS WILL ENSURE ALL DC
VOLTAGE IS REMOVED FROM THE CONTROLLER BOARD.
2.8.1 Configuration Jumpers
The controller may be configured as a main/alternate transmitter
or main/alternate exciter controller. The configuration process
involves positioning internal jumper selectors.
Other internal configuration jumpers are determined by the following:
a. Type of transmitter, solid-state or tube.
b. Transmitter overload recovery time.
c. Coaxial transfer switch control voltage and movement
time.
d. Transmitter remote control input logic.
Table 2-1 at the end of this section lists the required positions for
the jumpers which determine configuration as a main/alternate
transmitter controller.
2.8.1.1 JP2 - JP5
Sets the amount of time allowed for recovery of the main transmitter/exciter before a switch to the alternate unit is initiated in
the AUTOMATIC mode. There is only one jumper that must be
installed into either JP2, JP3, JP4, or JP5 and the chart lists the
timeout for each jumper.
For example, the main transmitter incurs an overload, turns off,
then turns back on again. Assume that this process takes 7
seconds.
If it is desired to begin to switch to the alternate transmitter before
the main transmitters turns back on again, then the timeout
should be set shorter than the 7 second recovery time and the
jumper should be installed into JP2 (2.0S) or JP3 (5.6S). Selecting JP2 will cause a faster switch to the alternate transmitter than
JP3.
If it is desired to allow the main transmitter the opportunity to
recover to see if it will return back to an allowable power output
level, then the timeout should be set longer than the 7 second
recovery time and the jumper should be installed into JP4 (9.1S)
or JP5 (27S). If at the end of the selected timeout, the main
transmitter has not returned to an allowable power output level
then the switch to the alternate unit will begin.
2.8.1.2 JP15
Sets the timing period for U20-9. This timing period should be
selected to be just longer than the maximum time required by the
coaxial transfer switch to move from one position to the other.
For example, the coaxial transfer switch manufacturer’s data
specifies that the total amount of time required to switch positions is 2.0 seconds - Position 2-3, 3.3 seconds should be selected.
2.8.1.3 JP11 - JP14
Sets the timing period for timer U15-9. This timing period is the
amount of time that the new switch position information remains
latched in JK flip-flops U12 and U13. The jumper time selected
is dependent upon the switching speed of the coaxial switch used.
NOTE
The time selected JP11 - JP14 MUST be longer than the time
selected by JP15.
For example, the coaxial transfer switch takes 2.0 seconds to
change positions and JP15 is jumpered for 3.3 seconds - the
jumper should be installed into JP13, 5.6 seconds.
2.8.1.4 JP16 - JP19
Sets the timing period for U21-9. This timing period is selected
to be longer than that required for a complete switch cycle. The
completion of the timing cycle of this timer is the point when the
filaments of the failed transmitter are turned off and the unit goes
to MANUAL mode following an automatic switch to the alternate unit.
For example, JP15 is jumpered for 3.3 seconds, JP13 is jumpered
for 5.6 seconds, JP17 should be used for 9 seconds.
2.8.1.5 JP22, JP23, JP25, JP39
These jumpers select normal or inverted interlock function for
the interlock indicator circuits. Position 1-2 inverts the interlock
function, position 2-3 is for normal interlock function.
2.8.1.6 JP24
Allows selection of the voltage source used for the interlock
indicator circuits. Position 1-2 allows the internal 12 V supply
to be used. Jumper 3-4 and 5-6 when the transmitter controller
power supplies are to be used.
2.8.1.7 JP31, JP32, JP37, JP41, JP43, JP45
These jumpers allow the transmitter A control lines (plate on and
off and filament off) to be configured for either voltage loop back
signalling or ground sink signalling. For voltage loopback operation for transmitter signalling, all jumpers should be positioned 1-2. For ground sink signalling for transmitter control, all
jumpers should be positioned 2-3.
2.8.1.8 JP30, JP33, JP34, JP40, JP42, JP44
These jumpers allow the transmitter B control lines (plate on and
off and filament off) to be configured for either voltage loop back
signalling or ground sink signalling. For voltage loopback operation for transmitter signalling all jumpers should be positioned 1-2. For ground sink signalling for transmitter control all
jumpers should be positioned 2-3.
2.8.1.9 JP35, JP36
These jumpers determine if auxiliary relays K7 and K8 operate
in a latched mode or in a momentary mode. Relays K7 and K8
respond to the A AIR and B AIR mode positions respectively. If
2-4
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WARNING: Disconnect primary power prior to servicing.
08-30-95
jumper JP36 is positioned 1-2, relay K7 will energize momentarily when the controller goes to the A AIR mode. If positioned
2-3 the relay will remain actuated as long as the controller
remains in the A AIR mode. Relay K8 operates in a likewise
fashion in the B AIR mode as determined by jumper JP35.
If the 2-3 position is chosen, a solid-state transmitter may not be
put in the “LOW” power mode because a “HIGH” command will
be given to the transmitter by the latched K7 or K8. This may be
desired however and force the TX LOC/REM to be n LOC or
“LOW” power operation. Also, “LOW” power will usually trigger a loss of rf by M/A Controller in AUTO mode but if M/A
Controller is in MANUAL mode, it may be required to go to the
“LOW” power (by user). Most units shipped from factory are in
momentary mode.
2.8.1.10 JP38
This jumper allows the selection of either the internal +12 V
power supply or an external power supply as the source of the
voltage for signalling the control relays of the coaxial transfer
switch. Jumpered 2-3 allows the internal supply to be used.
Jumper 1-2 allows an external supply to be used.
2.8.1.11 JP46
This jumper determines if the timing cycle of timer U20-9 is
allowed to run to completion or is terminated by the switch
“movement complete” signal from the switch position decoding
logic. Normally this jumper will be positioned 1-2 to allow the
“movement complete” signal to terminate the timing cycle. This
speeds up the switching cycle. If jumpered 2-3 the timer will run
to normal timing completion before the new on-air transmitter is
turned on.
2.8.1.12 JP47, JP48
These jumpers allow configuration of the logic for transmitter
filament on and off commands and plate on commands to be
tailored to the type of transmitters in use.
For solid state transmitters, no plate on command is required
prior to switching to the alternate transmitter. Nor is a filament
off command required for the failed unit following completion
of a switch to the alternate unit. For tube type transmitters these
commands are necessary.
When JP47 is jumpered 1-2, a plate on command is issued when
RF loss is sensed from the main unit. JP47 1-2 is normally
installed only for tube type transmitters as they require a filament
warm up prior to alternate unit switching.
JP47 3-4 is not currently jumpered in any application.
If JP47 is also jumpered 5-6 then a plate on command is issued
following the movement of the coaxial switch to the alternate
switch position. This jumper is normally installed for both tube
type and solid state transmitters.
If solid state units are in use then JP48 is jumpered 2-3 which
allows the on commands to be steered only to the transmitter
corresponding to the current A AIR or B AIR position
If tube type transmitters are in use, JP48 is jumpered 1-2 and on
commands are issued to both transmitters.
08-30-95
For main/alternate exciter applications, the positions of both
JP47 and JP48 have no impact on operation.
2.8.2 Transmitter Connections
The following lists the electrical connections to/from the controller and coaxial transfer switch, refer to Drawing 839-8118-399
in the drawing package for more details.
2.8.2.1 Main/Alternate Low Power Transmitter Controller
For low power transmitter applications below 500W, the optional
internal RF transfer switch may be used. This switch mounts
within the controller housing and plugs directly into the logic
board at connector J11. All power and status connections are
made through the single connector.
2.8.2.2 RF Output
Manually rotate the coaxial transfer switch to Position 1. Refer
to the manufacturers technical manual to determine the appropriate input/output port locations. Use an ohmmeter to verify
that in Position 1 transmitter A will be connected to the antenna
and transmitter B will be connected to the station load.
1. Connect the rf output from transmitter A and transmitter
B to the appropriate input connector on the coaxial
transfer switch.
2. Connect the antenna and station load to the appropriate
output connector on the coaxial transfer switch.
2.8.2.3 Filament Off/Plate Off/Plate On
When used as a main/alternate transmitter controller, the unit
must be interfaced to the remote control command inputs of each
transmitter. This will allow the controller to turn each transmitter
on or off at the proper times during a switching sequence.
Connector J2 provides the necessary interface connections to
transmitter A while J3 provides the corresponding but separate
remote command connections to transmitter B.
For solid state transmitters:
1. Connect the transmitter ON remote control input to J2-3
(Plate On) for transmitter A and J3-3 (Plate On) for
transmitter B.
2. Connect the transmitter OFF remote control input to
J2-4 (Plate Off) for transmitter A and J3-4 (Plate Off)
for transmitter B.
For tube type transmitters:
1. Connect the transmitter Plate ON remote control input
to J2-3 for transmitter A and J3-3 for transmitter B.
2. Connect the transmitter Plate OFF remote control input
to J2-4 for transmitter A and J3-4 for transmitter B.
3. Connect the transmitter Filament OFF remote control
input to J2-2 for transmitter A and J3-2 for transmitter
B.
In general, there are two types of remote command interface
standards in use. These two types are ground sinked and voltage
loopback. Internal jumpers allow the controller to be configured
to be compatible with either of these two types of transmitter
remote controls. There are separate jumper selectors for trans-
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WARNING: Disconnect primary power prior to servicing.
2-5
mitter A and transmitter B allowing independent selection for
each unit.
If the transmitter requires voltage loopback, the remote control
voltage from the transmitter must be connected to J2-10 for
transmitter A and/or J3-10 for transmitter B.
2.8.3 External Interlocks
Typically most transmitters require a normally closed set of
contacts to allow transmitter operation.
1. Connect the transmitter external interlocks for transmitter A to J6-1 and J6-14.
2. Connect the transmitter external interlocks for transmitter B to J6-2 and J6-15.
2.8.3.1 Antenna/Station Load Interlocks
Interlock control contact sets are provided to allow antenna and
station load interlocks to be switched by the controller as a
function of the coax switch position. Four double pole double
throw (form C) contact sets of latching relay K6 are available at
J6. These relay contact sets switch the antenna interlock and the
station load interlock to the main and standby transmitters respectively. In the A AIR position the relay will be in the RESET
position. In the B AIR position, the relay will be in the SET
position.
1. If used, connect the normally closed station load interlocks to J6-4 and J6-17.
2. If used, connect the normally closed antenna interlocks
to J6-3 and J6-16. Also the Antenna & Station Load
interlocks can be routed through the External Coaxial
Transfer Switch. This eliminates a possible hot switch
if for some reason the transmitter would not receive an
off command.
2.8.4 External Coaxial Transfer Switch
When an external switch is required, select a switch which
operates from an AC line voltage which is compatible with that
available at the transmitter site and has control relays which
operate on 12 Vdc. Verify that the RF power handling capabilities
of the switch exceed the output power levels of either transmitter.
Switch Connector J1 on the rear panel of the controller provides
the required command and status lines to the external switch.
1. If an external control voltage is required, connect the
supply to J1-1 and J1-21. JP38 must be jumpered 1-2.
2. Connect the common for the control relays to J1-17 and
J1-18.
3. Connect the control line for the command to go to
Position 1 to J1-4.
4. Connect the control line for the command to go to
Position 2 to J1-10.
5. Connect the +12 Vdc supply at J1-5 to the position
status relay common.
6. Connect the Position 1 status output to J1-6.
7. Connect the Position 2 status output to J1-19.
2-6
2.9 Initial Turn-On
The Main/Alternate Controller may be set up for transmitter
switching as follows:
CAUTION
REFER TO AC INPUT WIRING PROCEDURE IN PARAGRAPH 2-7.1
BEFORE PROCEEDING WITH THE FOLLOWING STEPS.
2.9.1 Sensitivity Adjustments
1. Refer to paragraph 2.7.1 for AC Voltage Select setup.
2. Apply power to the controller by inserting the ac power
cord into the socket on the rear panel.
3. Depress the MANUAL switch on the front panel and
verify that the indicator above the switch becomes
illuminated.
4. Depress the A AIR switch on the front panel and verify
that the indicator above the switch becomes illuminated.
5. Turn on transmitter A and slowly increase the rf power
while verifying that the antenna is receiving the rf
signal. Stop increasing the power output when 100%
of normal power is reached.
6. Decrease the rf output level of transmitter A power
output to the point where it is desired to automatically
switch to the alternate transmitter.
NOTE
The point at which the controller switches transmitters is totally
at the discretion of the operator. Depending on the type of transmitter and/or system, the setting of the trip point varies. The
overall goal should be to keep the output power at a maximum
safe operating level. Remember to allow for foldback power conditions.
7. Adjust the A SENSE control on the front panel clockwise until the indicator above the control illuminates.
8. Slowly adjust the A SENSE control counterclockwise
to the point where the indicator extinguishes and stop.
This is the point at which the controller will switch
transmitters.
9. Increase the output power of transmitter A until the
indicator illuminates.
10. Slowly decrease the power of transmitter A and check
the switch-over point. Return transmitter A back to
normal power output.
11. Depress the B AIR pushbutton switch on the controller.
12. Both transmitter A and transmitter B should receive
Plate Off commands.
13. The coaxial transfer switch should move to Position 2
and the B AIR indicator should be illuminated.
14. Turn transmitter B on.
15. Repeat the above steps using transmitter B, the B
SENSE control, and B SENSE indicator.
2.9.2 Automatic Switching
1. Operate transmitter A at 100% power with the controller in the MANUAL and A AIR modes.
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08-30-95
2. Verify A SENSE LED is illuminated.
3. Depress the AUTO switch on the front panel and verify
that the indicator above the switch becomes illuminated.
4. Lower the power output of transmitter A below the
sensitivity threshold. The A SENSE LED should extinguish.
5. The controller will issue a Plate On command to transmitter B. This command only happens in tube type
transmitters with JP47, 1-2.
6. After the recovery timer timeout, the controller will
issue a Plate Off command to both transmitters.
7. The coaxial transfer switch should move to Position 2
and the B AIR indicator should become illuminated.
8. After the coax switch timer is reset or times out, the
controller will isue a Plate On command to transmitter
B.
9. After the coax switch delay timer timeout, the controller
will issue a Filament Off command to transmitter A.
10. Verify that the controller switched itself to the MANUAL mode.
11. The red SWITCH ALARM LED should now be illuminated indicating a switch has occurred.
12. The B SENSE LED should now be illuminaetd.
13. To repeat the above steps using exciter B, return to step
2.
14. Repeat the above steps using transmitter B and the B
SENSE LED.
15. This completes the transmitter automatic switching
setup procedure.
2.10 Auxiliary Relay Contacts
Refer to schematic 839-7994-101 Schematic Main/Alternate
Controller sheet 5 for the following discussion.
Two auxiliary relay contact sets, each single pole double throw,
are provided also through connector J6. One set is associated
with the A AIR position relay K8 and one with the B AIR position
relay K7. Relay K8 is energized (continuously or momentarily
as selected by JP35) when the coax switch is in the A AIR
position. Relay K7 is energized (continuously or momentarily as
selected by JP36) in the B AIR position. When momentary mode
is selected for these contact sets, the relay will energize momentarily when the A AIR or B AIR position is first reached upon
08-30-95
operation of the coaxial switch. These contact sets may be used
to control various external devices.
2.11 Extended/Remote Control Connections
The front panel operation of the Main/Alternate Controller may
also be performed by extended or remote control. The unit will
need to be switched to the REMOTE mode prior to remote
operation.
The remote command and remote status connections are available through connector J4 on the rear panel of the controller. All
front panel controls and indicators with the exception of the
REMOTE/LOCAL switch are available through J4 for connection to remote control equipment.
2.11.0.1 Control Inputs
All control inputs are ground sinked and only a momentary
connection to ground is necessary to activate the function. Pushbutton switches (extended control) or relay contacts and control
transistors (remote control) may be used for providing the connection to ground. The device used in this application must be
capable of sinking up to 25 mA in the ON condition and withstand more than +15 Vdc when in the open circuit OFF state.
1.
2.
3.
4.
5.
Connect the switch ground to J4-21.
Connect the A AIR control line to J4-4.
Connect the B AIR control line to J4-5.
Connect the AUTOMATIC MODE control line to J4-7.
Connect the MANUAL MODE control line to J4-8.
2.11.0.2 Status Outputs
All status outputs are open collector type with 200 ohm series
resistors. Lamps and LED’s with dropping resistors (extended
control) or pullup resistors (remote control) may be used as status
indicators. Each status line can sink up to 25 mA of current in
the low (ON) state and withstand up to +30 Vdc in the high (OFF)
state.
1. +12 Vdc is present from J4-19 and J4-20 and may be
used for the interface circuits.
2. Connect the A SENSE indicator to J4-1.
3. Connect the B SENSE indicator to J4-2.
4. Connect the AUTOMATIC MODE indicator to J4-12.
5. Connect the MANUAL MODE indicator to J4-11.
6. Connect the REMOTE indicator to J4-13.
7. Connect the SWITCH ALARM indicator to J4-14.
8. Connect the A AIR indicator to J4-15.
9. Connect the B AIR indicator to J4-16.
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2-7
Table 2-1.
Transmitter Controller
Jumper(s)
Additional Information
Solid State Transmitter
JP1, JP6
JP2-JP5
Tube Type Transmitter
Exciter Controller
Always jumpered 1-2
JP2 (2.0seconds)
JP3 (5.6 seconds)
JP4 (9.1 seconds)
JP5 (27 seconds)
JP7, JP8
Always jumpered 2-3
JP9, JP10
Always jumpered 1-2
JP15
Position 1-2 (10 seconds)
Position 2-3 (3.3 seconds)
1-2
(2-3 for DIGIT™ Exciter)
JP11-JP14
JP11 (20.0 seconds)
JP12 (9.1 seconds)
JP13 (5.6 seconds)
JP14 (1.0 seconds)
NOTE: Must be longer
than switch travel time
JP14
JP16-JP19
JP16 (20 seconds)
JP17 (8.2 seconds)
JP18 (3.6 seconds)
JP19 (2 seconds)
NOTE: Must be longer
than JP11-JP14
JP18
JP20, JP21
Always jumpered 2-3
JP22, JP23, JP25, JP39 1-2 Normally Open
2-3 Normally Closed
2-3
JP24
Always jumpered 3-4, 5-6
JP26
Always jumpered 2-3
JP27
Always jumpered 1-2
JP28, JP29
Always jumpered 1-2
JP31, JP32, JP37,
JP41, JP43, JP45
TX A
1-2 Voltage Loopback
2-3 Ground Sink
2-3
JP30, JP33, JP34,
JP40, JP42, JP44
TX B
1-2 Voltage Loopback
2-3 Ground Sink
2-3
JP35, JP36
1-2 Momentary
2-3 Latched
2-3
JP38
1-2 External V
2-3 +12V
2-3
JP46
1-2 Reset
2-3 Timeout
1-2
JP47
5-6
1-2
5-6
1-2
5-6
JP48
2-3
1-2
2-3
JP49
2-8
Always jumpered 1-2
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WARNING: Disconnect primary power prior to servicing.
08-30-95
Section III
Operators Guide
3.1 Introduction
This section contains normal operational procedures and information pertaining to the function of the Main/Alternate Controller using the front panel controls and indicators.
3.2 Operation
This operational procedure is presented under the assumption
that the controller has been properly installed and checked out as
outlined in Section II, Installation/Initial Turn-On, of this manual
and as outlined in specific exciter/transmitter technical manuals.
3.3 Main/Alternate Exciter Controller
Operations
3.4 Main/Alternate Transmitter Control-
ler Operations
3.4.1 Low Power Solid State Transmitter Controller
Operation of the unit as a low power solid state transmitter
controller is the same, except that an internal coaxial transfer
switch is used. This is for applications of power levels up to
500W.
CAUTION
3.3.1 Transmitter RF Mute Not Connected
If the transmitter rf mute is not connected, then the selected
exciter will produce rf output if the transmitter is on or off. The
alternate exciter may be tested if the external load is connected,
by placing S1 on the rear of the unit to the TEST position.
3.3.2 Transmitter RF Mute Connected
If the transmitter rf mute is connected, then the selected exciter
will produce rf output only when the transmitter is on. If the
transmitter is off, then an rf mute will be applied to the selected
exciter. The alternate exciter may be tested if the external load is
connected, by placing S1 on the rear of the unit to the TEST
position.
3.3.3 Selecting An Exciter For Operation
1. Turn the transmitter off, to prevent any overload conditions.
2. Depress the MANUAL front panel switch and verify
that the indicator above the switch becomes illuminated.
3. Depress the A AIR or B AIR front panel switch, depending upon which exciter is to be selected for service.
4. Turn the transmitter back on.
5. The A or B SENSE LED should be illuminated.
6. Depress the AUTO front panel switch and verify that
the indicator above the switch becomes illuminated.
NOTE
For the following switching to occur, the controller must be in
the AUTOMATIC mode of operation.
3.3.4 Exciter Automatic Switching
If the selected exciter rf power output drops, but returns before
the Recovery Timer times out, no switching will occur. If the
selected exciter rf power output drops and does not recover, the
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controller will automatically connect the alternate exciter to the
transmitter. The controller will also switch itself to the MANUAL mode and the SWITCH ALARM LED will be illuminated.
The failed exciter may be serviced using the external load and
switch S1.
Do not depress the A AIR or B AIR front panel switches when the controller
is in the AUTOMATIC mode.
3.4.2 Selecting A Transmitter For Operation
1. Depress the MANUAL front panel switch and verify
that the indicator above the switch becomes illuminated.
2. Depress the A AIR or B AIR front panel switch, depending upon which transmitter is to be selected for service.
a. Both transmitters should receive Plate Off (tube type) or
Off (solid state) commands and should stop producing rf
power output.
b. The external coaxial switch should move to Position 1 if
A is selected or Position 2 if B is selected.
1. Manually turn the selected transmitter back on by depressing the Plate On (tube type) or On (solid state)
button on the transmitter front panel.
2. Be sure the A or B SENSE LED is illuminated (SEE
CAUTION BELOW).
3. Depress the AUTO front panel switch and verify that
the indicator above the switch becomes illuminated.
CAUTION
BE SURE THE A OR B SENSE LEDS ARE ILLUMINATED BEFORE
DEPRESSING THE CONTROLLER ‘AUTO’ MODE BUTTON, OTHERWISE THE CONTROLLER WILL IMMEDIATELY SHUT OFF THE
MAIN TRANSMITTER AND SWITCH TO THE BACK-UP TRANSMITTER.
FOR EXAMPLE: THE CONTROLLER IS IN THE MANUAL MODE.
TRANSMITTER A IS TURNED ON BUT IS RUNNING INTENTIONALLY AT A LOWER POWER. THE RF SAMPLE IS BELOW THE A
SENSE LED THRESHOLD POINT, THEREFORE THE LED IS OFF.
UPON DEPRESSING THE CONTROLLER AUTO BUTTON, THE
CONTROLLER INTERPRETS THE LOW RF LEVEL AS A FAULT
AND IMMEDIATELY BEGINS SWITCHING TO TRANSMITTER B.
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WARNING: Disconnect primary power prior to servicing.
3-1
NOTE
For the following switching to occur, the controller must be in
the AUTOMATIC mode of operation.
3.4.3 Transmitter Automatic Switching
If the selected transmitter rf power output drops, but returns by
the time the Recovery Timer times out, no switching will occur.
3-2
If the selected transmitter rf power output drops below the user
set threshold and does not recover, the controller will automatically connect the alternate transmitter to the antenna and turn it
on. The failed transmitter will be connected to the station load
and turned off. The controller will also switch itself to the
MANUAL mode and the SWITCH ALARM LED will be illuminated. The failed transmitter may be serviced using the station
load and manual front panel transmitter control.
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WARNING: Disconnect primary power prior to servicing.
11-18-94
Section IIIA
Controls And Indicators
3.1 Introduction
Figure 3A-1 shows the location of each control and indicator
associated with the Main/Alternate Controller. Table 3A-1 lists
these controls and indicators and describes their functions.
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3A-1
Figure 3A-1. Main/Alternate Controller
Controls and Indicators
3A-2
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Table 3A-1. Main/Alternate Controller
Controls and Indicators
Ref.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Control/Indicator
AUTO Switch S2
AUTO LED DS4
MANUAL Switch S4
MAN LED DS1
A AIR Switch S7
A AIR LED DS8
A SENSE R14
B SENSE R17
B AIR LED DS9
B AIR Switch S1
INTERLOCK B DS3
INTERLOCK A DS13
SENSE B LED DS7
SENSE A LED DS12
SWITCH ALARM DS2
16
REM/LOC Switch S3
17
18
19
20
21
22
REM LED DS11
LOC LED DS10
A+B AIR Switch S5
A+B AIR LED DS6
A+B TEST Switch S6
A+B TEST LED DS5
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Function
When depressed, selects automatic mode of operation. (Not Used)
Illuminates when the controller is in the automatic mode. (Not Used)
When depressed, selects manual mode of operation.
Illuminates when the controller is in the manual mode.
When depressed, selects the A AIR mode of operation.
Illuminates when the Combiner and RF Switch are in the A AIR position.
Allows adjustment of unit A rf threshold signal level applied to J10. (Not Used)
Allows adjustment of unit B rf threshold signal level applied to J5. (Not Used)
Illuminates when the Combiner and RF Switch are in the B AIR position.
When depressed, selects the B AIR mode of operation.
NOT USED, should not be illuminated.
NOT USED, should not be illuminated.
Illuminates when unit B has sufficient rf output. (Not Used)
Illuminates when unit A has sufficient rf output. (Not Used)
Illuminates to indicate an automatic transfer to the A AIR or B AIR mode is in process or has
been completed. This indicator remains illuminated until the AUTO switch is depressed. (Not
Used)
Selects either local only or remote and local acceptance of control function input. The switch is an
alternate (push-push) action switch.
Illuminates green to indicate the remote command mode has been selected.
Flashes red to indicate the local only command mode has been selected.
When depressed, selects the A+B AIR mode of operation. (Not Used)
Illuminates when the Combiner and RF Switch are in the A+B AIR position. (Not Used)
When depressed, selects the A+B TEST mode of operation. (Not Used)
Illuminates when the Combiner and RF Switch are in the A+B TEST position. (Not Used)
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3A-3
3A-4
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Section IV
Overall System Theory
4.1 Introduction
This section presents the principles of operation of the Main/Alternate Controller.
The basic unit may be used in one of the following applications:
•
•
•
•
Main/Alternate Exciter Controller
Main/Alternate Transmitter Controller
Switch Type Combiner Controller
Switchless Combiner Controller
11-21-94
This technical manual is concerned with the unit operating as a
Main/Alternate Exciter Controller or as a Main/Alternate Transmitter Controller. For simplicity, the first part of this section
describes the exciter controller and the second part describes the
transmitter controller. Each section contains a block diagram
description and a detailed circuits description.
The Main/Alternate Controller can be conveniently divided
into two basic circuits; the switching control or manual circuits, and the automatic circuitry.
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4-1
Figure 4-1. Main/Alternate Exciter Controller
Block Diagram
4-2
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WARNING: Disconnect primary power prior to servicing.
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4.2 Block Diagram Description - Main/Al-
ternate Exciter Controller
Refer to Figure 4-1 Block Diagram Main/Alternate Exciter Controller for the following discussion.
4.2.1 Manual Mode Of Operation
In the Manual Mode of operation, exciter A is selected for service
by depressing the A AIR front panel pushbutton switch or exciter
B may be selected with the B AIR switch. If the exciters are the
same type or of equal quality, either one may be designated as
the main exciter. An important function of the controller is to
apply an rf mute to both exciters. The controller will change the
position of the internal coaxial transfer switch, then un-mute only
the alternate exciter.
Signals from the A Air and B Air front panel pushbutton switches
are coded by Input Gating and Coding circuits into switch
position signals. The switch position signals are then applied to
the input portion of the appropriate J-K Flip-Flops to set the
flip-flops. At the same time, a signal is applied to the Clock Pulse
Generator circuits.
After a short delay, the J-K Flip-Flops are clocked with a pulse
from the Clock Pulse Generator. The outputs of the J-K FlipFlops are connected to Output Driver transistors which will mute
the main exciter and change the position of the coaxial transfer
switch.
When the coaxial switch completes its cycle, the Position Status
signal resets the Clock Pulse Generator and will un-mute the
alternate exciter and keep the main exciter muted.
4.2.2 Automatic Mode Of Operation
The primary function of the automatic circuitry is to sense a rf
power output failure of the selected exciter, then initiate the
appropriate switching to turn off the faulty unit and place the
alternate unit in service.
For the following action to occur, the controller must be in the
AUTO mode of operation. This mode may be selected by the
front panel pushbutton switch or by remote control.
RF power samples from exciter A and exciter B are connected to
fault Comparators. If the power output of the selected unit goes
below the user set threshold, the comparator will generate a fault.
The fault outputs of these Comparators are applied to the AutoManual Gates.
If a fault occurs, the Recovery Timer is started. If the power
output has returned to normal before the timeout, no switching
will occur. If the fault is still present when the Recovery Timer
times out, the fault is allowed to pass through the Auto-Manual
Gates. This will select the other unit and is the same as manually
pressing the front panel switch. For example, if exciter A has
failed, the signal from the Auto-Manual Gates will select B AIR.
The manual switching described above will occur and exciter B
will be selected for operation.
After a short Delay, the controller will switch itself to the
Manual mode of operation, to prevent the unit from ever trying to switch back to the failed unit. The Switch Alarm LED
on the front of the controller will illuminate red indicating a
switch has occurred.
A second clock signal from the Clock Pulse Generator resets the
flip-flops and de-energizes the interface transistors that drive the
coaxial switch.
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4-3
Figure 4-2. Main/Alternate Transmitter Controller
Block Diagram
4-4
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4.3 Block Diagram Description - Main/Al-
ternate Transmitter Controller
Refer to Figure 4-2 Block Diagram Main/Alternate Transmitter
Controller for the following discussion.
4.3.1 Manual Mode Of Operation
The basic function of the controller is to turn the main unit off
and change the position of the coaxial transfer switch. The
alternate unit may then be turned on manually from the front
panel of the transmitter.
Signals from the A Air and B Air front panel pushbutton switches
are coded by Input Gating and Coding circuits into switch
position signals. The switch position signals are then applied to
the input portion of the appropriate J-K Flip-Flop to set the
flip-flop. At the same time, a signal is applied to the Clock Pulse
Generator circuits.
The Clock Pulse Generator sends a signal to Plate Off Generator,
which via Interface Drivers provides a Plate Off signal to both
transmitters.
After a short delay, to allow the transmitters to stop producing rf,
the J-K Flip-Flops are clocked with a pulse from the Clock Pulse
Generator. The outputs of the J-K Flip-Flops are connected to
Output Driver transistors which change the position of the external coaxial transfer switch.
When the coaxial switch completes its cycle, the Position Status
signal resets the Clock Pulse Generator. A second clock signal
resets the flip-flops and de-energizes the interface transistors that
drive the coaxial switches.
The selected transmitter can then be turned on manually or by
remote control for operation, at any convenient time.
4.3.2 Automatic Mode Of Operation
The primary function of the automatic circuitry is to sense a rf
power output failure of the selected transmitter, then initiate the
appropriate switching to turn off the faulty unit and place the
alternate unit in service.
For the following action to occur, the controller must be in the
AUTO mode of operation. This mode may be selected by the
front panel pushbutton switch or by remote control.
RF power samples from transmitter A and transmitter B are
connected to fault comparators. If the power output of the selected unit goes below the user set threshold, the comparator will
generate a fault. The fault outputs of these comparators are
applied to the Auto-Manual Gates.
If a fault occurs, the Recovery Timer is started.
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If the power output has returned to normal before the timeout, no
switching will occur.
NOTE
The recovery timer allows for momentary faults such as short
power outages, momentary VSWR overloads, etc., in which the
main transmitter will return back to the ON-AIR mode instead of
switching to the backup transmitter unnecessarily.
If the fault is still present when the Recovery Timer times out,
the fault is allowed to pass through the Auto-Manual Gates. This
will begin the switching process to select the other unit.
For example, if transmitter A has failed, the signal from the
Auto-Manual Gates will start the Standby Transmitter and select
the B AIR mode.
The select B AIR signal from the Auto-Manual Gates will trigger
the Standby Transmitter Plate On Pulse Generator. If the transmitter is tube-type, this will begin the filament warmup sequence
for the alternate transmitter. If the transmitter is solid-state, no
warmup is needed and this output is not used.
The select B AIR signal from the Auto-Manual Gates is coded
by Input Gating and Coding circuits into switch position signals.
The switch position signals are then applied to the input portion
of the appropriate J-K Flip-Flop to set the flip-flop. At the same
time, a signal is applied to the Clock Pulse Generator circuits.
The Clock Pulse Generator sends a signal to Plate Off Generator,
which via Ingterface Drivers provides a Plate Off signal to both
transmitters.
After a short delay, to ensure that the transmitters have stopped
producing rf, the J-K Flip-Flops are clocked with a pulse from
the Clock Pulse Generator. The outputs of the J-K Flip-Flops are
connected to Output Driver transistors which change the position
of the external coaxial transfer switch.
When the coaxial switch completes its cycle, the Position Status
signal resets the Clock Pulse Generator. Another signal is sent to
the Plate On Pulse Generator, which generates a Plate On command to the selected transmitter.
The trailing edge of the Plate On signal clocks the J-K Flip-Flops
again. The second clock signal resets the flip-flops and de-energizes the interface transistors that drive the coaxial switches.
After the switching has taken place, the Filament Off Pulse
Generator will send a Filament Off signal to the faulty transmitter to turn it completely off. After a short Delay, the controller will switch itself to the Manual mode of operation, to
prevent the unit from ever trying to switch back to the failed
unit. The Switch Alarm LED on the front of the controller
will illuminate red indicating a switch has occurred.
888-2337-001
WARNING: Disconnect primary power prior to servicing.
4-5
4.4 Detailed Circuit Description -
Main/Alternate Exciter Controller
Refer to schematic 839-7994-101 Schematic Main/Alternate
Controller for the following discussion.
The easiest way to understand the operation of the controller is
to cover the sequence of events that occur when it switches units
in the MANUAL and AUTO modes.
4.4.1 Manual Mode Of Operation
Refer to Figure 4-3 Main/Alternate Exciter Controller Timing
Diagram for the following discussion. The diagram starts at the
top with the controller in the AUTO mode of operation and goes
downward, ending with selection of the alternate unit. When the
controller is in the MANUAL mode, the timing begins with the
TX Off Delay Timer being activated.
Assume that the controller is operating in the A AIR mode and
that exciter B is to be selected for service.
4.4.1.1 Input Gating And Coding
To accomplish this the B AIR pushbutton switch on the Display
Board would be depressed causing +12 Vdc to be applied to the
controller at J12-4 sheet 2 D-1. This active high input is applied
to NAND gate U10-9. U10 inverts the signal to a logic low and
applies it to NAND gates U11-5 and U11-12. This puts the J
inputs of J-K flip-flop integrated circuits U12 and U13 at a logic
high, which sets the input sections of flip-flop integrated circuits
U12 and U13. The outputs of the flip-flops will remain unchanged at this time.
4.4.1.2 TX Off Delay Timer U15-5
The active high at U10-9 is also applied to NAND gate U16-10
by forward biasing diode CR30. The output of U16-8 goes low
and triggers the timer at U15-6. The output of the timer at TP11
will remain high for 0.1 seconds and then go active low. The high
to low transition will then trigger the Clock Pulse Generator at
U15-8.
4.4.1.3 Clock Pulse Generator U15-9
The output of the Clock Pulse Generator at U15-9 will then go
to a logic high. The amount of time that the output remains high
is determined by JP11 through JP14.
When U15-9 goes high, the K bar inputs of the flip-flops U12
and U13 at pins 5 and 11 will be high and U16-11 will go active
low.
The active low at U16-11 is inverted by U4-5 and a active high
is applied to the Clock inputs of the flip-flops.
4.4.1.4 Flip-Flops
The J-K flip-flops U12 and U13 are set up so that they determine
rf switch commands. In the Main/Alternate Controller only two
switch commands definitions are used. To ensure that coaxial
transfer switch is not commanded to go to both position 1 and 2
at the same time, quad NAND gates are used. The NAND gate
inputs are connected to the Q and Q-bar outputs of the flip-flops.
In order for the output of a NAND gate to be a logic low, all inputs
must be a logic high, thus some flip-flops must be set and the
other flip-flops must be reset. If all flip-flops are either set or
reset, there would be no action on the output of the NAND gates.
4-6
The five sections of integrated circuits U14, U16 and U5 perform
this function in preventing two simultaneous switch position
commands.
At this point in the switching process, the J input at U13-6 will
be high and the J input at U13-10 will be low & the Clock and
K-bar input at U13 will also be high. This will set the upper
flip-flop of U13 and the Q output at pin 1 will go high and the
Q-bar output at pin 2 will go low. Since the J input to the lower
U13 is low, the outputs do not change, the Q output at pin 15 will
be low and the Q-bar output at pin 14 will be high.
NAND gate U5 pins 9, 10, and 11 will all be high, so the output
at TP29 will go active low. Only pin 10 of NAND gate U14 will
be active high, pins 9 and 11 will still be active low, therefore the
output at TP30 will remain high.
4.4.1.5 Output Drivers
The outputs of the NAND gates are inverted by U3 sheet 6 C-7
inverters and then by the NPN transistors contained in integrated
circuits U44 and U39. These inverters provide drive current for
the coax switch driver transistors Q1-Q5. These drivers provide
the current necessary to energize the control relays in the coaxial
transfer switch and cause the switch to rotate to its new position.
When TP29 goes active low, it is inverted by U31-12 and applied
as an active high to the anode of CR89 and to the base of U44-13.
When CR89 is forward biased, U39-14 turns on and applies a
ground to both exciters at J3-6 via CR58 (exciter B) and at J2-6
via CR59 (exciter A) sheet 4 B-3. This will rf mute the exciters
before the coaxial transfer switch changes position.
The active high from U31-12 will also turn on the transistor
U44-14 and ground the base of Q4. When Q4 is turned on, +12
Vdc is supplied to the coaxial transfer switch at J11-3.
4.4.1.6 Position Status/Indicators
Refer to sheet 4 C-8. When the coaxial transfer switch has
completed the switch cycle, the Position B status input at J11-8
will go active high. JP28 is jumpered 1-2 and NAND gate U25-12
will be high. JP26 is jumpered 2-3, JP29 is jumpered 1-2, and
+12 Vdc is applied to U25-13. The output at U25-11 will go low,
is inverted by U23-5, and applied as a logic high at J12-22. This
will illuminate the B AIR green LED on the Display Board.
4.4.1.7 RF Mute Control Relays
Since JP21 is jumpered 2-3, the active high from U23-5 will
energize relays K3 and K5. Relay K2 and K4 will be de-energized.
If S1 is in the Normal position, a ground will be applied to the
exciter A rf mute input at J2-13 via K3 contacts 9 and 13.
The connections to exciter B rf mute input at J3-13 will now be
open, but the rf mute applied by transistor U39-14 thru diodes
CR58, CR57, and CR59, CR60 will still be muting both exciters.
4.4.1.8 Auxiliary Relays
The active high output of U23-5 forward biases CR98 and is
connected to U28-17 and U29-9. The output of OR gate U29-8
will trigger timer U19 and the output at U19-1 will pulse active
high. If JP36 is jumpered 1-2, relay K7 will energize during this
888-2337-001
WARNING: Disconnect primary power prior to servicing.
11-21-94
pulse. If JP36 is jumpered 2-3, the logic high from U28-5 will
keep relay K7 energized.
removed. The rf power output of the exciter will be dissipated by
the external load.
4.4.1.9 Coax Switch Timer U20-9
4.4.2 Automatic Mode Switching
For the following action to occur, the controller must be in the
AUTO mode of operation. This mode may be selected by the
front panel pushbutton switch or by remote control.
Refer to sheet 4 C-8. When the Position 2 status at J11-8 goes
active high, TP22 will go active low and this will reset the Coax
Switch Timer at U20-10 sheet 3 D-4. Resetting the timer will
cause the output of the timer to go active low. U20-9 will then
trigger the Plate On Pulse Generator, U20-6.
4.4.1.10 Plate On Pulse Generator U20-5
The output of the Plate On Pulse Generator will go high for 0.68
seconds and this output is inverted by U17-12.
4.4.1.11 Clock Pulse Generator
The inverted 0.68 second pulse from U17-12 is applied to U1613 sheet 2 A-1. The output at U16-11 is inverted and connected
to the clock inputs of the flip-flops. The end of the 0.68s pulse
causes a second active high pulse at TP14 which again clocks the
J-K flip-flops. Because there is no input, all sections will be reset.
This will turn off rf mute transistor U39-14 sheet 6 A-2 and
coaxial transfer switch output driver Q4. Exciter B should be
un-muted and connected to the transmitter rf input and exciter A
should be rf muted.
4.4.1.12 Normal/Test Switch
If the Normal/Test switch on the rear panel of the unit is moved
to the Test position, the rf mute ground for exciter A will be
4.4.2.1 Auto/Manual Latching Relay
Latching relay K1sheet 3 A-4 controls which mode the controller
operates in. If the front panel MANUAL switch is depressed, +12
Vdc is connected via the Display Board to inverter U17-15. The
output at pin 5 causes NAND gate U18-1 to go active high and
this applies +12 Vdc to reset K1. K1 is shown on the schematic
in the reset condition. K1 pin 13 is pulled low by R29 sheet 1
C-4 and this is inverted by U17-9 sheet 3 B-7 to illuminate the
MANUAL led green on the Display Board. K1 pin 4 is pulled
high by R46 and this is inverted by U17-7 to extinguish the
AUTO led on the Display Board.
If the front panel AUTO switch is depressed, +12 Vdc is connected via the Display Board to inverter U17-17. The output at
pin 3 causes NAND gate U18-7 to go active high and this applies
+12 Vdc to set K1. K1 pin 13 is connected to +12 Vdc and this
is inverted by U17-9 to extinguish the MANUAL led green on
the Display Board. K1 pin 4 is grounded and this is inverted by
U17-7 to illuminate the AUTO led on the Display Board. When
Figure 4-3. Main/Alternate Exciter Controller
Timing Diagram
11-21-94
888-2337-001
WARNING: Disconnect primary power prior to servicing.
4-7
K1 is in the set or AUTO position, TP6 is active high and the
Auto-Manual Gates are active.
Assume that the controller is operating in the A AIR and AUTO
modes, and that exciter A rf power output becomes reduced.
4.4.2.2 Comparators
The controller accepts two rf sample inputs, one from exciter A
at J10 sheet 1 B-8 and one from exciter B at J5. The input voltage
must be a dc voltage representative of the rf signal and be
between +1 and +10 VDC. The rf sample voltages leave the
controller and are connected to sensitivity potentiometers on the
Display Board. The sensitivity potentiometers form a variable
voltage divider and the output returns to the controller and is
applied to the non-inverting input of each comparator. The inverting input to each comparator is connected to a reference
voltage divider.
If the power output of exciter A decreases below the comparator
threshold, TP10 will go active low. This is inverted by U2-14 and
applied to the Auto-Manual Gates at U3-2.
4.4.2.6 Switch To Manual Mode
When U5-12 sheet 1 D-1 goes low, the Coax Switch Delay Timer
U21-9 sheet 3 C-9 is triggered. The timeout is selectable by JP16
through JP19. When it times out, it triggers the Filament Off
Pulse Generator U21-5 for 2.0 seconds. This active low for 2.0
seconds is inverted by U23-18 and applied to U18-2 as a logic
high. U18-3 would be low and the output at U18-1 will go high
and resetting K1.
4.4.2.7 Switch Alarm Latch
When the output of the Auto-Manual Gates at U5-12 sheet 1 D-1
goes low, it is inverted by U17-14 Sheet 3 D-1 and sets the Switch
Alarm Latch U24. The Q NOT output at U24-2 will go low and
is inverted by U23-12. This will turn on transistor U37-1 and
illuminate the Switch Alarm on the front panel RED.
NOTE
This completes the detailed circuit description for the exciter controller, for other circuit descriptions not covered refer to the end
of this section.
4.4.2.3 Auto-Manual Gates
Several conditions must be met before the signal is allowed to
pass through the AUTO-MANUAL gates.
First K1 sheet 3 A-5 must be in the AUTO position and U3 sheet
1 D-5 pins 4 and 13 must be active high.
The JP1 and JP6 must be jumpered 1-2 and the AC Power Fail
Inhibit input at J9-2 must be high. U3 pins 1 and 10 will be active
high.
The Switch Inhibit Input at J8-20 must also be low, causing U3
pins 5 and 9 to be active high.
When all these conditions have been met, the signal from the
comparators can pass through the AUTO-MANUAL gates and
start the TX Overload Recovery Timer.
With U3 pins 1,2,4, and 5 logic high, the output at TP2 will go
low and start the TX Overload Recovery Timer. This output is
also inverted by U4-16 and connected to U5-1.
4.4.2.4 TX Overload Recovery Timer U7-5
The active low at TP2 triggers U7-6 and starts the Recovery
Timer. The timeout is jumper selected by JP2 through JP5. After
the timeout, the output at U7-5 goes active low and triggers the
Switch Enable Pulse Generator U7-8.
4.4.2.5 Switch Enable Pulse Generator U7-9
The Switch Enable Pulse Generator sheet 1 B-2 will supply an
active high pulse for 0.2 seconds to U5 pins 2 and 5. If there is
an exciter A power fault, at this point, U5 pins 1, 2, and 13 will
all be high. The output at U5-12 goes low and starts the switching
action and triggers the Coax Switch Delay Timer U21-8. If the
exciter A power fault is no longer present, U5-13 will be low and
the output at U5-12 will remain high and no switching will occur.
When U5-12 goes low, it is inverted by U4-18 and connected to
U10-9 sheet 2 C-4 via CR27. This is the same as depressing the
B AIR switch that was described above and the same action
occurs.
4-8
4.5 Detailed Circuit Description -
Main/Alternate Transmitter Controller
Refer to schematic 839-7994-101 Schematic Main/Alternate
Controller for the following discussion.
The easiest way to understand the operation of the controller is
to cover the sequence of events that occur when it switches units
in the MANUAL and AUTO modes.
4.5.1 Manual Mode Of Operation
Refer to Figure 4-4 Main/Alternate Transmitter Controller Timing Diagram for the following discussion. The diagram starts at
the top with the controller in the AUTO mode of operation and
goes downward, ending with selection of the alternate unit. When
the controller is in the MANUAL mode, the timing begins with
the Plate Off function being activated.
Assume that the controller is operating in the A AIR mode and
that transmitter B is to be selected for service.
4.5.1.1 Input Gating And Coding
To accomplish this the B AIR pushbutton switch on the Display
Board would be depressed causing +12 Vdc to be applied to the
controller at J12-4 sheet 2 D-1. This active high input is applied
to NAND gate U10-9. U10 inverts the signal to a logic low and
applies it to NAND gates U11-5 and U11-12. This puts the J
inputs of J-K flip-flop integrated circuits U12 and U13 at a logic
high, which sets the input sections of flip-flops. The outputs of
the flip-flops will remain unchanged at this time.
4.5.1.2 Plate Off
The logic high at U10-9 is also applied to the PLATE OFF OR
gate consisting of diodes CR28 through CR31. The logic high
output signal of the PLATE OFF OR gate is applied through
inverter integrated circuits U16-4,5 then to U4-11 to turn on
transistors U42-9 and U43-9 sheet 5 D-3. This results in PLATE
OFF commands being sent to both transmitters. These com-
888-2337-001
WARNING: Disconnect primary power prior to servicing.
11-21-94
mands may be either ground sinking or voltage loopback, depending upon jumpers JP30, JP31, JP44, JP45, and JP49.
4.5.1.3 TX Off Delay Timer U15-5
The active high at U10-9 sheet 2 C-4 is also applied to NAND
gate U16-10 by forward biasing diode CR30. The output of
U16-8 goes low and triggers the timer at U15-6. The output pulse
from timer integrated circuit U15-5 is relatively short, which
allows the transmitters to stop producing rf.The output of the
timer at TP11 will remain high for 0.1 seconds and then go active
low. The high to low transition will then trigger the Clock Pulse
Generator at U15-8.
4.5.1.4 Clock Pulse Generator U15-9
The output of the Clock Pulse Generator at U15-9 will then go
to a logic high. The amount of time that the output remains high
is determined by JP11 through JP14.
When U15-9 goes high, the K bar inputs of the flip-flops U12
and U13 at pins 5 and 11 will be high and U16-11 will go active
low.
The active low at U16-11 is inverted by U4-5 and a active high
is applied to the Clock inputs of the flip-flops.
4.5.1.5 Flip-Flops
The J-K flip-flops U12 and U13 are set up so that they determine
rf switch commands. In the Main/Alternate Controller only two
switch commands definitions are used. To ensure that coaxial
transfer switch is not commanded to go to both position 1 and 2
at the same time, quad NAND gates are used. The NAND gate
inputs are connected to the Q and Q-bar outputs of the flip-flops.
In order for the output of a NAND gate to be a logic low, all inputs
must be a logic high, thus some flip-flops must be set and the
other flip-flops must be reset. If all flip-flops are either set or
reset, there would be no action on the output of the NAND gates.
The five sections of integrated circuits U14, U16 and U5 perform
this function in preventing two simultaneous switch position
commands.
At this point in the switching process, the J input at U13-6 will
be high and the J input at U13-10 will be low & the Clock and
K-bar input at U13 will also be high. This will set the upper
flip-flop of U13 and the Q output at pin 1 will go high and the
Q-bar output at pin 2 will go low. Since the J input to the lower
U13 is low the outputs do not change, the Q output at pin 15 will
be low and the Q-bar output at pin 14 will be high.
NAND gate U5 pins 9, 10, and 11 will all be high, so the output
at TP29 will go active low. Only pin 10 of NAND gate U14 will
be active high, pins 9 and 11 will still be active low, therefore the
output at TP30 will remain high.
4.5.1.6 Output Drivers
The outputs of the NAND gates are inverted by U31 sheet 6 C-2
interter and then by the NPN transistors contained in integrated
circuits U44 and U39. These inverters provide drive current for
the coax switch driver transistors Q1-Q5. These drivers provide
the current necessary to energize the control relays in the external
coaxial transfer switch and cause the switch to rotate to its new
position.
11-21-94
When TP29 sheet 2 C-1 goes active low, it is inverted by U31-12
sheet 6 D-7 and applied as an active high to the anode of CR89
and to the base of U44-13.
The active high from U31-12 will also turn on the transistor
U44-14 and ground the base of Q4. When Q4 is turned on, either
+12 Vdc is supplied to the coaxial transfer switch at J1-10 or an
external source voltage is used if JP38 is jumpered 2-1.
4.5.1.7 Position Status/Indicators
When the coaxial transfer switch has completed the switch cycle,
the Position B status input at J1-19 sheet 4 C-8 will go active
high. JP28 is jumpered 1-2 and NAND gate U25-12 will be high.
JP26 is jumpered 2-3, JP29 is jumpered 1-2, and +12 Vdc is
applied to U25-13. The output at U25-11 will go low, is inverted
by U23-5, and applied as a logic high at J12-22. This will
illuminate the B AIR green LED on the Display Board.
4.5.1.8 Auxiliary Relays
The active high output of U23-5 forward biases CR98 and is
connected to U28-17 and U29-9 sheet 5 A-4. The output of OR
gate U29-8 will trigger D flip flop (used as a timer) U19 and the
output at U19-1 will pulse active high. If JP36 is jumpered 1-2,
relay K7 will energize during this pulse. If JP36 is jumpered 2-3,
the logic high from U28-5 will keep relay K7 energized.
4.5.1.9 Coax Switch Timer U20-9
When the Position 2 status at J1-19 sheet 4 C-8 goes active high,
TP22 will go active low and this will reset the Coax Switch Timer
at U20-10 sheet 3 D-4. Resetting the timer will cause the output
of the timer U20-9 to go active low then trigger the Plate On Pulse
Generator U20-6.
4.5.1.10 Plate On Pulse Generator U20-5
The output of the Plate On Pulse Generator will go high for 0.68
seconds and this output will forward bias CR96 sheet 5 C-8 and
is applied to JP47. Pins 5 and 6 are connected and the active high
is applied to U27-5. Since the controller is in the MANUAL
mode, U27-4 will be low and the output of U27-6 remains high.
Transmitter B does not receive a Plate On command, it will have
to manually be turned on.
The output of the Plate On Pulse Generator U20-5 sheet 3 D-1
is also inverted by U17-12.
4.5.1.11 Clock Pulse Generator
The inverted 0.68 second pulse from U17-12 is applied to U1613 sheet 2 A-1. The output at U16-11 is inverted and connected
to the clock input of the flip-flops. The end of the 0.68s pulse
causes a second active high pulse at TP14 which will again clock
the J-K flip-flops. Because there is no input, all sections will be
reset. Transmitter B should be connected to the antenna and
transmitter A should be connected to the station load.
4.5.2 Automatic Mode Switching
For the following action to occur, the controller must be in the
AUTO mode of operation. This mode may be selected by the
front panel pushbutton switch or by remote control.
4.5.2.1 Auto/Manual Latching Relay
Latching relay K1 sheet 3 A-5 controls which mode the controller
operates in. If the front panel MANUAL switch is depressed, +12
888-2337-001
WARNING: Disconnect primary power prior to servicing.
4-9
Figure 4-4. Main/Alternate Transmitter Controller
Timing Diagram
Vdc is connected via the Display Board to inverter U17-15. The
output at pin 5 causes NAND gate U18-1 to go active high and
this applies +12 Vdc to reset K1. K1 is shown on the schematic
in the reset condition. K1 pin 13 is pulled low by R29 sheet 1
C-4 and this is inverted by U17-9 sheet 3 B-7 to illuminate the
MANUAL led green on the Display Board. K1 pin 4 is pulled
high by R46 and this is inverted by U17-7 to extinguish the
AUTO led on the Display Board.
If the front panel AUTO switch is depressed, +12 Vdc is connected via the Display Board to inverter U17-17. The output at
pin 3 causes NAND gate U18-7 to go active high and this applies
+12 Vdc to set K1. K1 pin 13 is connected to +12 Vdc and this
is inverted by U17-9 to extinguish the MANUAL led green on
the Display Board. K1 pin 4 is grounded and this is inverted by
U17-7 to illuminate the AUTO led on the Display Board. When
K1 is in the set or AUTO position, TP6 is active high and the
Auto-Manual Gates are active.
4-10
Assume that the controller is operating in the A AIR and AUTO
modes, and that transmitter A rf power output becomes reduced.
4.5.2.2 Comparators
The controller accepts two rf sample inputs, one from transmitter
A at J10 sheet 1 B-8 and one from transmitter B at J5. The input
voltage must be a dc voltage representative of the rf signal and
be between +1 and +10 VDC. The rf sample voltages leave the
controller and are connected to sensitivity potentiometers on the
Display Board. The sensitivity potentiometers form a variable
voltage divider and the output returns to the controller and is
applied to the non-inverting input of each comparator. The inverting input to each comparator is connected to a reference
voltage divider.
If the power output of transmitter A decreases below the comparator threshold, TP10 will go active low. This is inverted by
U2-14 and applied to the Auto-Manual Gates at U3-2.
888-2337-001
WARNING: Disconnect primary power prior to servicing.
11-21-94
4.5.2.3 Auto-Manual Gates
4.5.2.7 Plate On Pulse Generator U20-5
Several conditions must be met before the signal is allowed to
pass through the AUTO-MANUAL gates.
After the Coaxial Switch Timer is reset by the Position 2 status
or after it times out, the Plate On Pulse Generator is triggered.
The output of the Plate On Pulse Generator will go high for 0.68
seconds and this output will forward bias CR96 sheet 5 C-8 and
is applied to JP47. Pins 5 and 6 are connected and the active high
will cause the output of U27-6 to go low. This low is inverted by
U28-18 and connected to JP48.
First K1 sheet 3 A-5 must be in the AUTO position and U3 sheet
1 D-5 pins 4 and 13 must be active high.
The JP1 and JP6 must be jumpered 1-2 and the AC Power Fail
Inhibit input at J9-2 must be high. U3 pins 1 and 10 will be active
high.
The Switch Inhibit Input at J8-20 must also be low, causing U3
pins 5 and 9 to be active high.
When all these conditions have been met, the signal from the
comparators can pass through the AUTO-MANUAL gates and
start the TX Overload Recovery Timer.
With U3 pins 1,2,4, and 5 logic high, the output at TP2 will go
low and start the TX Overload Recovery Timer. This output is
also inverted by U4-16 and connected to U5-1.
4.5.2.4 TX Overload Recovery Timer U7-5
The active low at TP2 triggers U7-6 and starts the Recovery
Timer. The timeout is jumper selected by JP2 through JP5. After
the timeout, the output at U7-5 goes active low and triggers
Standby Transmitter Plate On Pulse Generator and the Switch
Enable Pulse Generator U7-8.
4.5.2.5 Standby Transmitter Plate On Generator U33-5
When U7-5 goes active high, inverter U17-16 sheet 3 D-7
triggers the Standby Transmitter Plate On Generator at U33-6.
The output at TP19 will go high for 2.0 seconds, this forward
biases CR95 sheet 5 C-8 and is present at JP47-1.
For tube-type transmitters, JP47 is jumpered 1-2 and as long as
the unit is in the AUTO mode the output of U27-6 will go low.
This is inverted by U28-18 and connected to JP48, which is also
jumpered 1-2 for tube type transmitters. The active high turn on
transistors U42-1 and U43-1. Depending upon jumpers JP34,
JP37, JP40, and JP41, both transmitters will receive ground
sinking or voltage loopback Plate On commands. This will start
the filament warmup process on the alternate transmitter.
For solid state transmitters, there is no JP47 1-2 because a
warmup time is not needed.
4.5.2.6 Switch Enable Pulse Generator U7-9
The Switch Enable Pulse Generator will supply an active high
pulse for 0.2 seconds to U5 pins 2 and 5. If there is a transmitter
A power fault, at this point, U5 pins 1, 2, and 13 will all be high.
The output at U5-12 goes low and starts the switching action and
triggers the Coax Switch Delay Timer U21-8. If the transmitter
A power fault is no longer present, the output at U5-12 will
remain high and no switching will occur.
When U5-12 goes low, it is inverted by U4-18 and connected to
U10-9 sheet 2 C-4 via CR27. This is the same as depressing the
B AIR switch that was described above and for the most part the
same action occurs. The only different is that the Plate On Pulse
Generator will send Plate On commands and the Coax Switch
Delay Timer is triggered.
11-21-94
With solid state transmitters JP48 is jumpered 2-3 and the active
high is applied to steering AND gates U26-6 and U26-3. Since
the coaxial transfer switch has already changed to Position 2,
U26-2 will be high and U26-5 will be low. The active high output
of U26-3 will forward bias CR73 and turn on transistor U42-1.
This results in a PLATE ON command being sent to transmitter
B. These command may be either ground sinking or voltage
loopback, depending upon jumpers JP34 and JP40.
With tube type transmitters JP48 is jumpered 1-2 and the active
high will forward bias CR70 and CR76, turning on transistors
U42-1 and U43-1. This results in a PLATE ON command being
sent to both transmitters. These command may be either ground
sinking or voltage loopback, depending upon jumpers JP34 &
JP40 and JP37 & JP41.
Because transmitter B has been switched into the station load, it
may be interlocked off because the air or water flow interlock
associated with the station load may be open.
4.5.2.8 Coax Switch Delay Timer
When the output of the Auto-Manual Gates at U5-12 sheet 1 D-1
goes low, the Coax Switch Delay Timer U21-9 sheet 3 C-6 is
triggered. The timeout is selectable by JP16 through JP19 and
must be longer that the coaxial transfer switch movement time.
When it times out, it triggers the Filament Off Pulse Generator.
4.5.2.9 Filament Off Pulse Generator
When the Filament Off Pulse Generator is triggered, the output
at U21-5 will go low for 2.0 seconds. This is inverted by U23-18
and applied to U27-10 sheet 5 B-8 and U27-12. Since the coaxial
transfer switch has already moved to Position 2, U27-13 will be
high. The output of U27-11 will go low and is inverted by
U28-12. This turns on transistor U43-7 and sends a Filament Off
command to transmitter A. These command may be either
ground sinking or voltage loopback, depending upon jumpers
JP32 and JP43.
4.5.2.10 Switch To Manual Mode
The output of U23-18 sheet 3 C-3 is applied to U18-2 as a logic
high. U18-3 would be low and the output at U18-1 will go high
and reset K1.
The controller will therefore be in the Manual mode and will not
try to switch back to transmitter A.
4.5.2.11 Switch Alarm Latch
When the output of the Auto-Manual Gates at U5-12 sheet 1 D-1
goes low, it is inverted by U17-14 sheet 3 D-7 and sets the Switch
Alarm Latch U24. The Q NOT output at U24-2 will go low and
is inverted by U23-12. This will turn on transistor U37-1 and
illuminate the Switch Alarm on the front panel RED.
888-2337-001
WARNING: Disconnect primary power prior to servicing.
4-11
4.6 Display Board
Refer to schematic 839-7994-100 in the drawing package for the
following discussion.
The Display Board is physically mounted on the inside of the
front panel. It contains pushbutton function switches, LED indicators, sensitivity potentiometers, and the remote/local switch. A
ribbon cable connects J1 on the Display Board to J12 on the
controller board.
When one of the front panel function switches is depressed, +12
Vdc is sent as an active high to the controller. The bar graph LED
indicators require an active high from the controller for illumination. The potentiometers are used to vary the dc voltage for the
fault comparators located on the controller. When the Remote
mode is selected by S3, +12 Vdc is connected to J1-25 and turns
on Q1 which illuminates the Remote indicator green. When the
Local mode is selected by S3, ground is connected to J1-25 and
the Local indicator DS10. The active high pulses at the Flash
input on J1-24 will cause this indicator to flash red, as a visual
indication of this mode.
4.7 Interconnection Diagram
Refer to schematic 839-8071-045 Schematic Main/Alternate,
schematic 839-7994-101 Schematic Main/Alternate Controller,
or Combiner Controller in the drawing package for the following
discussion.
mately 12 Vdc. Capacitors C94, C95, and C96 provide bypassing
for the regulator. Diodes CR92 and CR93 are protection devices
to prevent the capacitors from discharging through low current
paths internal to the regulator and damaging the device.
4.8.1 AC Restart Time Delay Relays
When the ac power fails, the selected exciter/transmitter will turn
off and power should be removed from the controller. Relays K1
and K2 are used during these conditions to prevent the controller
from falsely switching to the alternate unit.
4.8.1.1 AC Power Fail Reset Relay K1
When ac power is correctly applied, diodes CR1 and CR2 rectify
the ac input and energize K1. The +12 Vdc supply from the
controller at J9-7 sheet 6 B-8 is connected via K1 pins 6 and 7
back to the AC Power Fail Reset-L on the controller at J9-1 sheet
1 A-6. This active high allows the proper response of the Transmitter Overload Recovery Timer U7-4 and the Switch Enable
Pulse Generator U7-10, when a rf power fault is detected in the
AUTO mode of operation. When the ac power is lost, K1 will
de-energize and J9-1 will be connected to chassis ground. The
ground applied at this time to U7 pins 4 and 10 will hold these
two timer’s output low, preventing any recovery timing or
switching action while the dc supply voltages decay to 0V.
4.8.1.2 AC Power Fail Inhibit Time Delay Relay K2
4.8 Power Supply
When ac power is applied, K2 will be energized. The +12 Vdc
supply from the controller at J9-7 is connected, via K1-7, through
K2 pins 7 and 4 to the AC Power Fail Inhibit at J9-2 sheet 1 D-8.
With JP1 and JP6 in the 1-2 position, the active hgih input at J9-2
will forward bias CR101 and CR100, and inverted by U1 and
again inverted by U2. TP7 and TP9 will therefore be high. This
allows the first section of the Auto-Manual Gates to properly
respond to a fault from the comparators.
The power supply for the controller consists of transformer T1,
bridge rectifier CR91, filter capacitor C93, and the components
associated with regulator IC U32. The input to transformer T1 is
protected by fuse F1. F1 is contained within the line filter/selector FL1 (located on the rear panel) FL1 allows selection of 220
Vac or 110 Vac input to the primary windings of transformer T1.
Bridge rectifier CR91 is connected across the secondary windings, which are connected in parallel. Capacitor C93 filters the
dc component of the rectifier output. The dc voltage at the input
to voltage regulator transistor Q1 is approximately 17 to 19 volts
DC. This voltage will vary with the AC line voltage. Resistors
R113 and R114 set the output voltage of the regulator at approxi-
When the ac power is lost, K2 will de-energize and the +12 Vdc
will no longer be present at J9-2 on the controller. This active
low, inverted twice by U1 and U2, disables the first part of the
Auto-Manual Gates and does not allow a trigger of the Transmitter Overload Recovery Timer. When ac power is restored, K2 will
remain de-energized for a length of time determined by R1
between pins 2 and 5. R1 is selected, approximately 20k ohms
per second, so the ON-AIR exciter/transmitter has ample time to
re-establish an rf signal before the controller tries to switch to the
alternate unit. After the delay, the active high is again present at
J9-2 allowing a detected rf fault to start the Transmitter Overload
Recovery Timer.
4-12
888-2337-001
WARNING: Disconnect primary power prior to servicing.
11-21-94
Section V
Maintenance/Alignments
5.1 Introduction
Person who actually made the repair.
This section provides preventive maintenance checks, cleaning,
and alignment information.
STATION ENGINEER
5.2 Purpose
5.4 Safety Precautions
The information contained in this section is intended to provide
guidance to establish a comprehensive maintenance program to
promote operational readiness and eliminate downtime. Particular emphasis is placed on preventive maintenance and record
keeping functions.
5.3 Station Records
The importance of keeping station performance records cannot
be over-emphasized. Separate logbooks should be maintained by
operation and maintenance activities. These records can provide
data for predicting potential problem areas and analyzing equipment malfunctions.
5.3.1 Transmitter Logbook
Any deviations in the Main/Alternate Controller performance
should be recorded in the Transmitter logbook along with conditions that might be associated with the deviation. This will
permit the problem to be repeated during maintenance.
5.3.2 Maintenance Logbook
The maintenance logbook should contain a complete description
of all maintenance activities required to keep the controller
operational. A list of maintenance information to be recorded and
analyzed to provide a data base for a failure reporting system is
as follows:
DISCREPANCY
Describe the nature of the malfunction. Include all observable
symptoms and performance characteristics.
CORRECTIVE ACTION
Describe the repair procedure used to correct the malfunction.
DEFECTIVE PART(S)
List all parts and components replaced or repaired. Include the
following details:
a. COMPONENT TIME IN USE
b. COMPONENT PART NUMBER
c. COMPONENT MAJOR ASSEMBLY
d. COMPONENT REFERENCE DESIGNATOR
SYSTEM ELAPSED TIME
Total controller time on.
Indicates chief engineer noted and approved the repair.
The controller design provides safety features which help ensure
that no high voltage points are readily accessible to personnel
unless the case or protective shields are disassembled. Although
low voltages are primarily used throughout the module circuitry,
110 Vac can be present on the printed circuit board from external
circuits connected to the relay contacts. Maintenance with power
energized is always hazardous and caution should be observed.
Component or module replacement with power on is not recommended. External circuits should also be disconnected before
performing maintenance.
5.5 Preventive Maintenance
Preventive maintenance is a systematic series of operations performed periodically on equipment. As these procedures cannot
be applied indiscriminately, specific instructions are necessary.
a. Visual inspection is the most important preventive maintenance operation because it determines the necessity for the
others. Become thoroughly acquainted with normal operation conditions in order to recognize and identify abnormal
conditions readily. The remedy for most visible defects is
obvious, however, care must be taken if heat damaged
components are located. Overheating is usually a symptom
of trouble. It is essential to determine the actual cause of
overheating before the heat damaged component is replaced, otherwise the damage may be repeated.
b. Clean parts when inspection shows that cleaning is required.
5.5.1 Maintenance Of Components
The following paragraphs provide information for component
maintenance.
5.5.1.1 Semiconductors
The best check of semiconductor performance is actual circuit
operation. When semiconductors are replaced, the operation of
associated circuits may be affected and should be checked.
Replacement semiconductors should be of the original type or a
recommended direct replacement. Preventive maintenance of
semiconductors is accomplished by performing the following
steps:
a. Inspect the semiconductors and surrounding area for accumulations of dirt or dust.
NAME OF REPAIRMAN
11-18-94
888-2337-001
WARNING: Disconnect primary power prior to servicing.
5-1
b. Use a vacuum cleaner and a brush to remove dust from the
area.
c. Examine all semiconductors for loose connections or corrosion.
5.7 Main/Alternate Exciter Controller
Adjustments
The Main/Alternate Controller may be set up for exciter switching as follows:
5.5.1.2 Capacitors
Preventive maintenance of capacitors is accomplished as follows:
a. Examine all capacitor terminals for loose connections or
corrosion.
b. Examine the body of each capacitor for swelling, discoloration, or other evidence of breakdown.
c. Use a vacuum cleaner and a brush to remove dust from the
area.
5.5.1.3 Fixed Resistors
Preventive maintenance of fixed resistors is accomplished by the
following steps:
a. Examine resistors for dirt or signs of overheating. Discolored, cracked, or chipped components indicate a possible
overload.
b. When replacing a resistor ensure the replacement value
corresponds to the original component.
c. Use a vacuum cleaner and a brush to remove dust from the
area.
5.5.1.4 Relays
Replace hermetically sealed relays if defective.
5.5.1.5 Printed-Circuit Boards
Preventive maintenance of printed-circuit boards is accomplished by checking the following:
a. Inspect the printed-circuit boards for cracks or breaks.
b. Inspect the wiring for open circuits or raised foil.
c. Check components for breakage or discoloration due to
overheating.
d. Use standard practices to repair solder connections with a
low-wattage soldering iron.
5.6 Corrective Maintenance
The maintenance philosophy of the controller consists of problem isolation to a specific area and subsequent isolation and
replacement of the defective component. Corrective maintenance for the controller is limited by the objective of minimum
down time. Maintainability and care are considerably simplified
for operation and maintenance personnel as the controller is
designed and built with highly reliable and proven elements to
minimize down time.
5-2
5.7.1 Sensitivity Adjustments
1. Apply power to the controller by inserting the ac power
cord into the socket on the rear panel.
2. Depress the MANUAL switch on the front panel and
verify that the indicator above the switch becomes
illuminated.
3. Depress the A AIR switch on the front panel and verify
that the indicator above the switch becomes illuminated.
4. Turn on exciter A and slowly increase the rf power while
verifying that the transmitter is receiving rf drive. Stop
increasing the power output when 100% of normal rf
drive to the transmitter is reached.
5. Decrease the rf output level of exciter A to the point
where it is desired to automatically switch to the alternate exciter.
NOTE
The point at which the controller switches exciters is totally at
the discretion of the operator. It should be noted that exciter failure is likely to be catastrophic compared to transmitter failures,
in that the exciter will probably cease to produce rf rather than
slowly drop in output level. It is suggested that the trip point be
set at approximately 50% of the normal exciter rf output operating level.
6. Adjust the A SENSE control on the front panel clockwise until the indicator above the control illuminates.
7. Slowly adjust the A SENSE control counterclockwise
to the point where the indicator extinguishes and stop.
This is the point at which the controller will switch
exciters.
8. Increase the rf output level of exciter A until the indicator illuminates.
9. Slowly decrease the rf output level of exciter A and
check the switch-over point. Return exciter A back to
normal power output.
10. Depress the B AIR pushbutton switch on the controller.
11. Repeat the above steps using exciter B, the B SENSE
control, and the B SENSE indicator.
5.7.2 Automatic Switching
1. Operate exciter A at 100% power with the controller in
the MANUAL and A AIR modes. Verify A SENSE
LED is illuminated.
2. Depress the AUTO switch on the front panel and verify
that the indicator above the switch becomes illuminated.
3. Lower the power output of exciter A below the sensitivity threshold.
888-2337-001
WARNING: Disconnect primary power prior to servicing.
11-18-94
4. After the recovery timer times out, verify that the controller applies an rf mute to both exciters and switches
the output of exciter B to the transmitter rf input.
5. The controller should release the rf mute for exciter B
and maintain the rf mute to exciter A.
6. Verify that the controller switches itself to the MANUAL mode.
7. Repeat the above steps using exciter B.
8. This completes the exciter automatic switching setup
procedures.
5.8 Main/Alternate Transmitter Control-
ler Adjustments
The Main/Alternate Controller may be setup for transmitter
switching as follows:
5.8.1 Sensitivity Adjustments
1. Apply power to the controller by inserting the ac power
cord into the socket on the rear panel.
2. Depress the MANUAL switch on the front panel and
verify that the indicator above the switch becomes
illuminated.
3. Depress the A AIR switch on the front panel and verify
that the indicator above the switch becomes illuminated.
4. Turn on transmitter A and slowly increase the rf power
while verifying that the antenna is receiving the rf
signal. Stop increasing the power output when 100% of
normal power is reached.
5. Decrease the rf output level of transmitter A power
output to the point where it is desired to automatically
switch to the alternate transmitter.
NOTE
The point at which the controller switches transmitters is totally
at the discretion of the operator. Depending on the type of transmitter and/or system, the setting of the trip point varies. The
overall goal should be to keep the output power at a maximum
safe operating level.
6. Adjust the A SENSE control on the front panel clockwise until the indicator above the control illuminates.
11-18-94
7. Slowly adjust the A SENSE control counterclockwise
to the point where the indicator extinguishes and stop.
This is the point at which the controller will switch
transmitters.
8. Increase the output power of transmitter A until the
indicator illuminates.
9. Slowly decrease the power of transmitter A and check
the switch-over point. Return transmitter A back to
normal power output.
10. Depress the B AIR pushbutton switch on the controller.
11. Both transmitter A and transmitter B should receive
Plate Off commands.
12. The coaxial transfer switch should move to Position 2
and the B AIR indicator should be illuminated.
13. Repeat the above steps using transmitter B, the B
SENSE control, and B AIR indicator.
5.8.2 Automatic Switching
1. Operate exciter A at 100% power with the controller in
the MANUAL and A AIR modes. Verify A SENSE LED
is illuminated.
2. Depress the AUTO switch on the front panel and verify
that the indicator above the switch becomes illuminated.
3. Lower the power output of exciter A below the sensitivity threshold. The A AIR SENSE LED should be
extinguished.
4. After the recovery timer times out, verify that the controller applies an rf mute to both exciters and switches
the output of exciter B to the transmitter rf input.
5. The controller should release the rf mute for exciter B
and maintain the rf mute to exciter A.
6. Verify that the controller switches itself to the MANUAL mode.
7. The red SWITCH ALARM LED should now be illuminated indicating a switch has occurred.
8. The B SENSE LED should now be illuminaetd.
9. To repeat the above steps using exciter B, return to step 2.
10. Repeat the above steps using exciter B.
11. This completes the exciter automatic switching setup
procedures.
888-2337-001
WARNING: Disconnect primary power prior to servicing.
5-3
5-4
888-2337-001
WARNING: Disconnect primary power prior to servicing.
11-18-94
Section VA
Views
843 5265 001
888-2337-001
WARNING: Disconnect primary power prior to servicing.
5A-1
843 5265 002
5A-2
888-2337-001
WARNING: Disconnect primary power prior to servicing.
Modified 843 5265 002
888-2337-001
WARNING: Disconnect primary power prior to servicing.
5A-3
5A-4
888-2337-001
WARNING: Disconnect primary power prior to servicing.
Section VI
Troubleshooting
6.1 Introduction
6.4 Component Replacement
The following Section contains troubleshooting information for
the Main/Alternate Controller only. Refer to other specific technical manuals for troubleshooting information for the exciters or
transmitters.
The printed-circuit boards of the Main/Alternate Controller may
be removed using the following procedure:
NOTE
Refer to Section VI-A, for possible modes of bypassing that might
be performed in certain failure conditions.
6.2 General Troubleshooting
Most troubleshooting consists of visual and logic level checks.
Prior to starting a troubleshooting procedure, check all switches,
power cord and cable connections, and fuses.
After the trouble has been isolated to a specific area, refer to the
theory section of this manual for circuit discussion to aid in
problem resolution. If replacement parts are required, refer to
Section VII, Parts List.
6.3 Specific Troubleshooting
The following section lists some possible modes of failure and
provides specific troubleshooting information.
6.3.1 No Front Panel LEDs Illuminated
1. Check for +12 Vdc at TP23.
2. Check for an ac input to the bridge rectifier at J9-3, 4
and J9-5, 6.
3. Verify that FL1, the ac line filter/selector on the rear of
the unit, is jumpered for the correct line voltage.
4. Measure fuse F1 with an ohmmeter.
5. Ensure that the ac cord is correctly inserted into the
socket.
6.3.2 Controller Does Not Switch Correctly In The
AUTO Mode
1. Verify that the sensitivity adjustments have been correctly setup, see Section II.
2. Verify that the AC Power Fail Inhibit at J9-2 is active
high. If it is low, check relays K1 and K2.
6.3.3 Controller Switches To The Other Unit When
Placed In The AUTO Mode
1. Check for the proper dc voltages at the rf power sample
inputs at J10 (unit A) and J5 (unit B) located on the rear
panel. The input voltage must be a dc voltage representative of the rf signal and be between +1 and +10
Vdc.
11-18-94
1. Disconnect the ac power cord from the power mains.
2. Tag and remove the interconnecting cables on the rear
panel.
3. Remove the four front panel screws holding the unit in
the rack.
4. Carefully slide the unit out of the mounting rack.
5. Place the unit on a clean work bench and remove the
top cover.
6. Using a test lead connected to chassis ground, discharge
C93 by touching the other end of the test lead to the
positive terminal of C93.
7. Disconnect the ribbon cable which connects the Display board to/from the controller board.
8. To remove the Display board assembly remove the
screws which secure the board to the front panel. Gently
tilt the board toward the rear of the unit and move up
and out of the chassis.
9. To remove the controller board, unplug the two ribbon
cables which connect connectors J6 and J8 to the controller board. Disconnect the coaxial switch connector
J11 (if installed) and the power supply connector J9.
Remove all screws which secure it to the chassis. Gently
lift the front of the board while pulling toward the front.
The board will slide out from under the coax switch (if
installed) and can then be removed.
10. To reinstall the boards, reverse the order of the above
steps.
NOTE
Refer to Section VA, VIEWS for identification of the components
on the circuit board by symbol number.
The circuit board used in the Main/Alternate Controller is of the
double-sided plated-through type. This means that there are
traces on both sides of the board and the through-holes contain
a metallic plating. Because of the plated-through holes, solder
creeps up into the hole. This requires a more sophisticated
technique for component removal in order to avoid damage to
the traces on the board. Excessive heat on any point on the board
will cause damage.
To remove a component from a double-sided board, the leads of
the defective component should be cut from the body while the
leads are still soldered to the board. The component is then
discarded and each lead is heated independently and pulled out
of the hole. Each hole may then be cleared of solder with a solder
vacuum tool.
The new component is installed in the usual way and soldered
from the bottom side of the board. If no damage has been done
to the plated-through hole, soldering of the top side is not
888-2337-001
WARNING: Disconnect primary power prior to servicing.
6-1
required. However, if the removal procedure did not progress
smoothly, each lead should be soldered at the top side to prevent
potential intermittent problems.
After soldering, remove residual flux. There are solvents available in electronic supply houses which are useful. The board
6-2
should then be checked to ensure the defluxing operation has
removed the flux and not just smeared it about so that it is less
visible. While rosin flux is not normally corrosive, it will absorb
moisture and become conductive enough to cause deterioration
in specifications over a period of time.
888-2337-001
WARNING: Disconnect primary power prior to servicing.
11-18-94
Section VIA
Emergency Operating Procedures
6.1 Introduction
The following section is intended to make the maintenance
personnel aware of some of the bypass modes of operation that
are possible in the Main/Alternate Controller. If certain failures
occur, it is possible to temporarily bypass the source of the
problem and remain operational until proper maintenance can be
performed.
6.1.1 Incorrect AUTO Mode Operation
If the controller is not correctly operating in the AUTO mode:
1. Select the MANUAL mode of operation with the front
panel switch.
2. Use the A AIR or B AIR front panel switches to control
which unit is to be selected for service.
3. Manually control the selected unit with it’s front panel
controls and indicators.
6.1.2 Complete Unit Bypassing
1. The controller may be completely bypassed by disconnecting all cables on the rear panel.
2. If the internal coaxial transfer switch is used, then a type
“N” connector barrel may be used to patch the desired
unit output to the transmitter rf input or antenna.
3. If an external coaxial transfer switch is used, determine
if it is possible to manually rotate the switch to the
required position.
4. Switch the selected unit to local control and manually
turn it on or off.
888-2337-001
WARNING: Disconnect primary power prior to servicing.
6A-1
6A-2
888-2337-001
WARNING: Disconnect primary power prior to servicing.
Section VII
Parts List
This section contains a list of the replaceable parts.
See Replaceable Parts Service clause on back side of title page.
Replaceable Parts List Index
Table 7-1.
Table 7-2.
Table 7-3.
Table 7-4.
Table 7-5.
Table 7-6.
Table 7-7.
Table 7-8.
Table 7-9.
2/17/04
MAIN/ALTERNATE CTLR-PLAT GREY .
MAIN/ALTERNATE CTLR-BLACK . . . .
MAIN/ALTERNATE CTLR, DARK GRAY
CONTLR, MAIN/ALT - BASIC . . . . .
CABLE ASSY, RIBBON 34C . . . .
CABLE ASSY, RIBBON, 25C . . .
PWA, MAIN/ALT CNTRLR . . . . .
PWB, DISPLAY BD. . . . . . . . .
KIT, CONNECTOR . . . . . . . . . .
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. 992 9785 001 (B)
. 992 9785 003 (B)
. 992 9785 004 (B)
. 994 9381 004 (J)
. 922 1200 001 (A)
. 922 1200 002 (A1)
. 992 8583 001 (W)
. 992 8584 002 (D)
. 992 8602 002 (C)
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WARNING: Disconnect primary power prior to servicing.
7-2
7-2
7-2
7-2
7-3
7-3
7-3
7-5
7-6
7-1
Table 7-1. MAIN/ALTERNATE CTLR-PLAT GREY - 992 9785 001 (B)
Harris PN
Description
QTY UM
939 8118 669. . . . . . FRONT PANEL MAIN/ALTERNATE . . . . . . . . . 1.0 EA
994 9381 004. . . . . . CONTLR, MAIN/ALT - BASIC . . . . . . . . . . . . . . 1.0 EA
Reference Designators
Table 7-2. MAIN/ALTERNATE CTLR-BLACK - 992 9785 003 (B)
Harris PN
Description
QTY UM
939 7968 134. . . . . . FRONT PNL, M/A CONTROLLER . . . . . . . . . . . 1.0 EA
994 9381 004. . . . . . CONTLR, MAIN/ALT - BASIC . . . . . . . . . . . . . . 1.0 EA
Reference Designators
Table 7-3. MAIN/ALTERNATE CTLR, DARK GRAY - 992 9785 004 (B)
Harris PN
Description
QTY UM
939 8118 733. . . . . . PNL, FRONT, MAIN/ALTERNATE . . . . . . . . . . . 1.0 EA
994 9381 004. . . . . . CONTLR, MAIN/ALT - BASIC . . . . . . . . . . . . . . 1.0 EA
Reference Designators
Table 7-4. CONTLR, MAIN/ALT - BASIC - 994 9381 004 (J)
Harris PN
250 0274 000. . . . . .
296 0258 000. . . . . .
354 0658 000. . . . . .
358 3223 000. . . . . .
384 0357 000. . . . . .
398 0017 000. . . . . .
404 0807 000. . . . . .
472 0622 000. . . . . .
484 0296 000. . . . . .
548 2400 509. . . . . .
574 0362 000. . . . . .
576 0095 000. . . . . .
614 0505 000. . . . . .
614 0752 000. . . . . .
839 7994 100. . . . . .
839 7994 101. . . . . .
839 8071 045. . . . . .
917 2461 001. . . . . .
922 1200 001. . . . . .
922 1200 002. . . . . .
922 1203 004. . . . . .
939 7968 138. . . . . .
939 7968 140. . . . . .
988 2337 001. . . . . .
992 8583 001. . . . . .
992 8584 002. . . . . .
992 8602 002. . . . . .
999 2822 001. . . . . .
7-2
Description
QTY UM
CORD, AC, 3C, NEMA/IEC PLUG . . . . . . . . . . 1.0 EA
TUBING TEFLON 19AWG . . . . . . . . . . . . . . . . . . 1 FT
TERMINAL PRESSURE. . . . . . . . . . . . . . . . . . . 2.0 EA
FEMALE SCREWLOCK .56"4-40 . . . . . . . . . . . 2.0 EA
RECTIFIER 1N4004 ESD . . . . . . . . . . . . . . . . . 8.0 EA
FUSE, FAST CART 1A 250V . . . . . . . . . . . . . . . 1.0 EA
RELAY SOCKET . . . . . . . . . . . . . . . . . . . . . . . . 1.0 EA
XFMR CTL 115/230V 50/60HZ . . . . . . . . . . . . . 1.0 EA
* FILTER RFI POWER LINE . . . . . . . . . . . . . . . 1.0 EA
RES 121K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 1.0 EA
RELAY 2PDT 12VDC. . . . . . . . . . . . . . . . . . . . . 1.0 EA
RELAY TIME DELAY ADJ . . . . . . . . . . . . . . . . . 1.0 EA
TERM BD 12 TERM . . . . . . . . . . . . . . . . . . . . . . 1.0 EA
TERM BD 6 TERM . . . . . . . . . . . . . . . . . . . . . . . 1.0 EA
SCHEM, DISPLAY BD. . . . . . . . . . . . . . . . . . . . . 0
SCHEM, MAIN/ALT CNTRLR . . . . . . . . . . . . . . . 0
SCHEM, MAIN/ALT OR . . . . . . . . . . . . . . . . . . . . 0
CONTROL MAIN/ALT . . . . . . . . . . . . . . . . . . . . 1.0 EA
CABLE ASSY, RIBBON 34C . . . . . . . . . . . . . . . 1.0 EA
CABLE ASSY, RIBBON, 25C. . . . . . . . . . . . . . 2.0 EA
PLATE, MTG, TERM BD . . . . . . . . . . . . . . . . . 1.0 EA
CHASSIS, CONTROLLER . . . . . . . . . . . . . . . . . 1.0 EA
COVER, CONTROLLER . . . . . . . . . . . . . . . . . . 1.0 EA
DP, XMTR MAIN/ALT CNTRL . . . . . . . . . . . . . . 1.0
PWA, MAIN/ALT CNTRLR . . . . . . . . . . . . . . . . . 1.0 EA
PWB, DISPLAY BD. . . . . . . . . . . . . . . . . . . . . . 1.0 EA
KIT, CONNECTOR. . . . . . . . . . . . . . . . . . . . . . 1.0 EA
HARDWARE LIST, CONTROLLER . . . . . . . . . 1.0 EA
Reference Designators
#R001
#R001
XK001
R001
K001
K002
888-2337-001
WARNING: Disconnect primary power prior to servicing.
2/17/04
Table 7-5. CABLE ASSY, RIBBON 34C - 922 1200 001 (A)
Harris PN
822 1200 001 . . . . .
250 0456 000 . . . . .
612 1015 000 . . . . .
Description
QTY UM
CABLE LAYOUT, RIBBON 34C . . . . . . . . . . . . . . 0
CABLE, RIBBON 34 COND 28 AWG . . . . . . . . . . 0 FT
RECP 34C 2 ROW STRAIGHT IDC . . . . . . . . . 2.0 EA
Reference Designators
Table 7-6. CABLE ASSY, RIBBON, 25C - 922 1200 002 (A1)
Harris PN
822 1200 002 . . . . .
2500340000A . . . . .
610 1126 000 . . . . .
612 0997 000 . . . . .
Description
QTY UM
CBL LAYOUT, (NO 1/1 REQ) . . . . . . . . . . . . . . . . 0
*CABLE, RIBBON 26 COND 28 AWG. . . . . . . . . . 0 FT
PLUG, D, 25 PIN, MTA/IDC. . . . . . . . . . . . . . . . 1.0 EA
RECP 26C 2 ROW STRAIGHT IDC . . . . . . . . . 1.0 EA
Reference Designators
Table 7-7. PWA, MAIN/ALT CNTRLR - 992 8583 001 (W)
Harris PN
358 1214 000
380 0188 000
380 0190 000
380 0678 000
382 0381 000
382 0397 000
382 0464 000
382 0466 000
382 0475 000
382 0497 000
382 0498 000
382 0500 000
382 0501 000
382 0516 000
382 1016 000
382 1070 000
382 1084 000
384 0326 000
384 0357 000
.....
.....
.....
.....
.....
.....
.....
.....
.....
.....
.....
.....
.....
.....
.....
.....
.....
.....
.....
Description
QTY UM
SCREWLOCK, FEMALE . . . . . . . . . . . . . . . . . . 4.0 EA
XSTR, TIP30, PNP ESD. . . . . . . . . . . . . . . . . 5.0 EA
XSTR, PNP 2N3906 ESD. . . . . . . . . . . . . . . . . . . 1 EA
*XSTR, ARRAY QUAD 2222 ESD . . . . . . . . . . 6.0 EA
IC, NE556N ESD . . . . . . . . . . . . . . . . . . . . . . . 5.0 EA
IC, CD4013/MC14013 ESD. . . . . . . . . . . . . . . 2.0 EA
*IC, 74C00 ESD. . . . . . . . . . . . . . . . . . . . . . . 6.0 EA
IC 4027 DUAL J/K F/F ESD. . . . . . . . . . . . . . . . 2.0 EA
IC, 317 ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 EA
* IC 74C32
ESD. . . . . . . . . . . . . . . . . . . . 1.0 EA
*IC, 74C20 ESD. . . . . . . . . . . . . . . . . . . . . . . 1.0 EA
*IC, 74C10 ESD. . . . . . . . . . . . . . . . . . . . . . . 2.0 EA
*IC, 74C08 ESD . . . . . . . . . . . . . . . . . . . . . . . . 1.0 EA
*IC, 74C908 ESD . . . . . . . . . . . . . . . . . . . . . 2.0 EA
*IC, MM74C240N ESD . . . . . . . . . . . . . . . . . 6.0 EA
IC, ILQ-1 OPTO-ISOLATOR ESD . . . . . . . . . . 2.0 EA
IC, LP339N ESD. . . . . . . . . . . . . . . . . . . . . . . . 1.0 EA
RECT FW BRIDGE 8AMP 600V ESD . . . . . . . 1.0 EA
RECTIFIER 1N4004 ESD. . . . . . . . . . . . . . . 103.0 EA
384 0743 000
404 0498 000
404 0673 000
404 0674 000
.....
.....
.....
.....
DIODE ARRAY DUAL 8 ESD. . . . . . . . . . . . . . 2.0
HEAT SINK FOR CASE TO-3 . . . . . . . . . . . . . . 1.0
SOCKET, DIP, 8 PIN (DL). . . . . . . . . . . . . . . . . 2.0
SOCKET, DIP, 14 PIN (DL). . . . . . . . . . . . . . . 27.0
EA
EA
EA
EA
404 0675 000 . . . . . SOCKET, DIP, 16 PIN (DL). . . . . . . . . . . . . . . 10.0 EA
404 0767 000 . . . . . SOCKET, DIP, 20 PIN (DL). . . . . . . . . . . . . . . . 6.0 EA
2/17/04
Reference Designators
Q001,Q002,Q003,Q004,Q005
Q006,Q007,Q008,Q009,Q010,Q011,Q012,Q013,Q014,Q015
U036,U037,U039,U042,U043,U044
U007,U015,U020,U021,U033
U019,U024
U001,U010,U011,U016,U025,U027
U012,U013
U032
U029
U003
U005,U014
U026
U018,U030
U002,U004,U017,U023,U028,U031
U008,U009
U006
CR091
CR001,CR002,CR003,CR004,CR005,CR006,CR007,CR008,CR009,CR010
,CR011,CR012,CR013,CR014,CR015,CR016,CR017,CR018,CR019,CR020
,CR021,CR022,CR023,CR024,CR025,CR026,CR027,CR028,CR029,CR030
,CR031,CR032,CR033,CR034,CR035,CR036,CR037,CR038,CR039,CR040
,CR041,CR042,CR043,CR044,CR045,CR046,CR047,CR048,CR049,CR050
,CR051,CR052,CR053,CR054,CR055,CR056,CR057,CR058,CR059,CR060
,CR061,CR062,CR065,CR066,CR067,CR068,CR069,CR070,CR071,CR072
,CR073,CR074,CR075,CR076,CR077,CR078,CR079,CR080,CR081,CR082
,CR083,CR084,CR085,CR086,CR087,CR088,CR089,CR090,CR092,CR093
,CR094,CR095,CR096,CR097,CR098,CR099,CR100,CR101,CR102,CR103
,CR104,CR105,CR106
U034,U035
#U032
XU018,XU030
XU001,XU003,XU005,XU006,XU007,XU010,XU011,XU014,XU015,XU016,X
U019,XU020,XU021,XU024,XU025,XU026,XU027,XU029,XU033,XU034,XU
035,XU036,XU037,XU039,XU042,XU043,XU044
XR012,XR013,XR014,XR015,XR016,XR017,XU008,XU009,XU012,XU013
XU002,XU004,XU017,XU023,XU028,XU031
888-2337-001
WARNING: Disconnect primary power prior to servicing.
7-3
404 0828 000. . . . . .
410 0385 000. . . . . .
494 0239 000. . . . . .
506 0230 000. . . . . .
SOCKET, SIP18, STRAIGHT. . . . . . . . . . . . . . . 2.0
INSULATOR TO-3 SILICON . . . . . . . . . . . . . . . 1.0
CHOKE, WIDE BAND 2.5 TURN . . . . . . . . . . . . 8.0
CAP .001UF 100VAC 5%. . . . . . . . . . . . . . . . . 20.0
EA
EA
EA
EA
506 0232 000. . . . . . CAP, 0.01UF 100V 5%. . . . . . . . . . . . . . . . . . . 23.0 EA
506 0238 000. . . . . .
506 0239 000. . . . . .
506 0245 000. . . . . .
506 0246 000. . . . . .
516 0453 000. . . . . .
CAP, 0.015UF 100V 5%. . . . . . . . . . . . . . . . . . . 1.0
CAP, 0.022UF 100V 5%. . . . . . . . . . . . . . . . . . . 4.0
CAP, 0.33UF 63V 5%. . . . . . . . . . . . . . . . . . . . . 4.0
CAP, 0.47UF 63V 5%. . . . . . . . . . . . . . . . . . . . . 4.0
CAP .1UF 100V 20% X7R . . . . . . . . . . . . . . . . 32.0
EA
EA
EA
EA
EA
516 0530 000. . . . . .
522 0547 000. . . . . .
522 0548 000. . . . . .
522 0550 000. . . . . .
522 0578 000. . . . . .
CAP .01UF 10% 100V X7R . . . . . . . . . . . . . . . . . 1
* CAP 3300UF 40V -10/+50% . . . . . . . . . . . . . . 1.0
CAP 10UF 50V 20%. . . . . . . . . . . . . . . . . . . . . . 4.0
CAP 100UF 25V 20%. . . . . . . . . . . . . . . . . . . . 11.0
CAP 1.0UF 50V 20% . . . . . . . . . . . . . . . . . . . . 14.0
EA
EA
EA
EA
EA
540 0308 000. . . . . .
540 1356 000. . . . . .
540 1366 000. . . . . .
540 1387 000. . . . . .
540 1391 000. . . . . .
540 1414 000. . . . . .
540 1429 000. . . . . .
540 1486 000. . . . . .
540 1524 000. . . . . .
548 2051 000. . . . . .
548 2400 034. . . . . .
548 2400 101. . . . . .
*RES 100 OHM 1W 10% . . . . . . . . . . . . . . . . . . 1.0
RES NETWORK 10K OHM 2% . . . . . . . . . . . . . 2.0
RES NETWORK 100 OHM 2% . . . . . . . . . . . . . 2.0
RES NETWORK 10K OHM 2% . . . . . . . . . . . . . 5.0
RES NETWORK 220 OHM 2% . . . . . . . . . . . . . 1.0
RES NETWORK 4700 OHM 2% . . . . . . . . . . . . 5.0
RES NETWORK 680 OHM . . . . . . . . . . . . . . . . 1.0
RES NETWORK 1000 OHM 2% . . . . . . . . . . . . 1.0
RES NTWK 100K 2% SIP 5/10 . . . . . . . . . . . . . 1.0
RES ZERO OHM . . . . . . . . . . . . . . . . . . . . . . . . 1.0
RES 2.21 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 5.0
RES 10 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 13.0
EA
EA
EA
EA
EA
EA
EA
EA
EA
EA
EA
EA
548 2400 201. . . . . .
548 2400 238. . . . . .
548 2400 251. . . . . .
548 2400 301. . . . . .
548 2400 330. . . . . .
548 2400 334. . . . . .
548 2400 366. . . . . .
548 2400 381. . . . . .
548 2400 401. . . . . .
RES 100 OHM 1/2W 1% . . . . . . . . . . . . . . . . . 12.0
RES 243 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 1.0
RES 332 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 5.0
RES 1K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . . 6.0
RES 2K OHM 1/2W 1% . . . . . . . . . . . . . . . . . . . 4.0
RES 2.21K OHM 1/2W 1%. . . . . . . . . . . . . . . . . 5.0
RES 4.75K OHM 1/2W 1%. . . . . . . . . . . . . . . . 10.0
RES 6.81K OHM 1/2W 1%. . . . . . . . . . . . . . . . . 1.0
RES 10K OHM 1/2W 1% . . . . . . . . . . . . . . . . . 13.0
EA
EA
EA
EA
EA
EA
EA
EA
EA
548 2400 430. . . . . .
548 2400 451. . . . . .
548 2400 454. . . . . .
548 2400 466. . . . . .
548 2400 473. . . . . .
548 2400 489. . . . . .
548 2400 493. . . . . .
548 2400 501. . . . . .
548 2400 530. . . . . .
548 2400 542. . . . . .
548 2400 601. . . . . .
548 2400 634. . . . . .
RES 20K OHM 1/2W 1% . . . . . . . . . . . . . . . . . .
RES 33.2K OHM 1/2W 1%. . . . . . . . . . . . . . . . .
RES 35.7K OHM 1/2W 1%. . . . . . . . . . . . . . . . .
RES 47.5K OHM 1/2W 1%. . . . . . . . . . . . . . . . .
RES 56.2K OHM 1/2W 1%. . . . . . . . . . . . . . . . .
RES 82.5K OHM 1/2W 1%. . . . . . . . . . . . . . . . .
RES 90.9K OHM 1/2W 1%. . . . . . . . . . . . . . . . .
RES 100K OHM 1/2W 1% . . . . . . . . . . . . . . . . .
RES 200K OHM 1/2W 1% . . . . . . . . . . . . . . . . .
RES 267K OHM 1/2W 1% . . . . . . . . . . . . . . . . .
RES 1MEG OHM 1/2W 1% . . . . . . . . . . . . . . . .
RES 2.21MEG OHM 1/2W 1%. . . . . . . . . . . . . .
EA
EA
EA
EA
EA
EA
EA
EA
EA
EA
EA
EA
7-4
5.0
1.0
1.0
2.0
2.0
1.0
2.0
2.0
2.0
1.0
1.0
2.0
XK006
#U032
RFC001 RFC002 RFC003 RFC004 RFC005 RFC006 RFC007 RFC008
C017,C018,C023,C025,C027,C029,C031,C033,C036,C038,C057,C058,C05
9,C060,C086,C087,C088,C089,C090,C092
C006,C010,C011,C013,C015,C019,C043,C047,C049,C054,C056,C064,C06
6,C069,C073,C077,C079,C080,C082,C083,C084,C085,C094
C081
C002,C004,C005,C021
C039,C040,C041,C042
C001,C007,C022,C091
C024,C026,C028,C030,C032,C034,C035,C037,C061,C063,C097,C098,C09
9,C100,C101,C102,C103,C104,C105,C106,C107,C108,C109,C110,C111,C
112,C113,C114,C115,C116,C117,C118
C119,C120,C121,C122,C123,C124,C125,C126,C127,C128
C093
C003,C020,C071,C072
C009,C014,C044,C050,C051,C055,C065,C067,C076,C078,C095
C008,C012,C016,C045,C046,C048,C052,C053,C062,C068,C070,C074,C07
5,C096
R039
R012,R017
R013,R014
R002,R005,R009,R010,R011
R016
R003,R004,R006,R007,R008
R015
R080
R001
R117
R099,R101,R104,R107,R110
R020,R037,R042,R056,R061,R068,R077,R082,R084,R087,R088,R090,R09
5
R021,R026,R032,R038,R045,R053,R055,R058,R059,R062,R063,R094
R114
R098,R102,R105,R106,R111
R019,R029,R031,R079,R081,R112
R027,R071,R073,R113
R097,R100,R103,R108,R109
R066,R067,R070,R074,R083,R085,R089,R091,R092,R096
R041
R028,R036,R043,R044,R046,R051,R069,R072,R075,R076,R078,R086,R11
5
R022,R040,R050,R052,R054
R064
R049
R057,R060
R023,R035
R048
R024,R034
R065,R116
R033,R047
R025
R093
R018,R030
888-2337-001
WARNING: Disconnect primary power prior to servicing.
2/17/04
574 0448 000
574 0485 000
578 0026 000
604 0859 000
610 0877 000
.....
.....
.....
.....
.....
RELAY 12VDC 4PDT LATCHING. . . . . . . . . . . 1.0
RELAY DPDT 12VDC 2 AMP . . . . . . . . . . . . . . 1.0
RELAY DPDT 12VDC 2 AMP . . . . . . . . . . . . . . 6.0
SW, TGL DPDT . . . . . . . . . . . . . . . . . . . . . . . . . 1.0
HDR, STR, 2 PIN, SQ . . . . . . . . . . . . . . . . . . . 12.0
EA
EA
EA
EA
EA
610 0900 000 . . . . . HEADER 3 CKT STRAIGHT . . . . . . . . . . . . . . 35.0 EA
610 0933 000 . . . . . JUMPER, PWB TEST POINT . . . . . . . . . . . . . 29.0 EA
610 0947 000
610 0982 000
610 0984 000
610 1070 000
610 1106 000
612 1181 000
612 1184 000
.....
.....
.....
.....
.....
.....
.....
RECP, D, 15 PIN, RT ANG . . . . . . . . . . . . . . . . 2.0
*HDR 26C VERT 2ROW TOP LATCH . . . . . . . 2.0
*HDR 34C VERT 2ROW TOP LATCH . . . . . . . 1.0
HDR 6 PIN STRAIGHT . . . . . . . . . . . . . . . . . . . 2.0
HDR, 8PIN, 1ROW, STRT,POL. . . . . . . . . . . . . 2.0
*D RECP 25C RT ANGLE . . . . . . . . . . . . . . . . . 2.0
SHUNT JUMPER 0.1" CENTERS . . . . . . . . . . 42.0
EA
EA
EA
EA
EA
EA
EA
612 1268 000
839 7994 101
843 5265 002
999 2818 001
.....
.....
.....
.....
RECEPTACLE RT ANG BNC . . . . . . . . . . . . . . 2.0 EA
SCHEM, MAIN/ALT CNTRLR . . . . . . . . . . . . . . . . 0
PWB, MAIN/ALT CNTRLR . . . . . . . . . . . . . . . . 1.0
HARDWARE LIST, MAIN/ALT . . . . . . . . . . . . . 1.0 EA
Harris PN
380 0189 000
384 0826 000
384 0827 000
384 0849 000
384 0850 000
404 0828 000
.....
.....
.....
.....
.....
.....
Description
QTY UM
XSTR, NPN 2N3904 ESD. . . . . . . . . . . . . . . . . 1.0 EA
LED LIGHT BAR, RED ESD. . . . . . . . . . . . . . . 2.0 EA
LED LIGHT BAR, GREEN ESD . . . . . . . . . . . . 3.0 EA
LED LIGHT BAR, GREEN ESD . . . . . . . . . . . . 5.0 EA
LED LIGHT BAR, RED ESD. . . . . . . . . . . . . . . 1.0 EA
SOCKET, SIP18, STRAIGHT . . . . . . . . . . . . . . 4.0 EA
548 2400 237
548 2400 277
548 2400 401
550 0921 000
604 1121 000
604 1125 000
610 0984 000
839 7994 100
843 5265 001
.....
.....
.....
.....
.....
.....
.....
.....
.....
RES 237 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 5.0
RES 619 OHM 1/2W 1% . . . . . . . . . . . . . . . . . . 6.0
RES 10K OHM 1/2W 1%. . . . . . . . . . . . . . . . . . 5.0
POT 100K OHM 1/2W . . . . . . . . . . . . . . . . . . . . 2.0
SW PB BLUE MOM W/O LED. . . . . . . . . . . . . . 4.0
SW PB BLUE W/O LED . . . . . . . . . . . . . . . . . . 1.0
*HDR 34C VERT 2ROW TOP LATCH . . . . . . . 1.0
SCHEM, DISPLAY BD. . . . . . . . . . . . . . . . . . . . . . 0
PWB, DISPLAY BD. . . . . . . . . . . . . . . . . . . . . . 1.0
K006
K001
K002,K003,K004,K005,K007,K008
S001
JP002,JP003,JP004,JP005,JP011,JP012,JP013,JP014,JP016,JP017,JP018
,JP019
JP001,JP006,JP007,JP008,JP009,JP010,JP015,JP020,JP021,JP022,JP023
,JP025,JP026,JP027,JP028,JP029,JP030,JP031,JP032,JP033,JP034,JP03
5,JP036,JP037,JP038,JP039,JP040,JP041,JP042,JP043,JP044,JP045,JP0
46,JP048,JP049
TP001,TP002,TP003,TP004,TP005,TP006,TP007,TP008,TP009,TP010,TP
011,TP012,TP013,TP014,TP015,TP016,TP017,TP019,TP020,TP021,TP022
,TP023,TP024,TP025,TP026,TP027,TP028,TP029,TP030
J002,J003
J006,J008
J012
JP024,JP047
J009,J011
J001,J004
#JP001,#JP002,#JP006,#JP007,#JP008,#JP009,#JP010,#JP013,#JP015,#
JP018,#JP020,#JP021,#JP022,#JP023,#JP025,#JP026,#JP027,#JP028,#J
P029,#JP030,#JP031,#JP032,#JP033,#JP034,#JP035,#JP036,#JP037,#JP
038,#JP039,#JP040,#JP041,#JP042,#JP043,#JP044,#JP045,#JP046,#JP0
48,#JP049 #2JP024 #2JP047
J005,J010
Table 7-8. PWB, DISPLAY BD. - 992 8584 002 (D)
2/17/04
EA
EA
EA
EA
EA
EA
EA
Reference Designators
Q001
DS001,DS002
DS004,DS008,DS009
DS003,DS007,DS011,DS012,DS013
DS010
XDS001,XDS002,XDS003,XDS004,XDS007,XDS008,XDS009,XDS010,XDS
011,XDS012,X DS013
R001,R002,R004,R008,R009
R003,R007,R010,R011,R019,R020
R012,R013,R015,R016,R018
R014,R017
S001,S002,S004,S007
S003
J001
888-2337-001
WARNING: Disconnect primary power prior to servicing.
7-5
Table 7-9. KIT, CONNECTOR - 992 8602 002 (C)
Harris PN
354 0384 000. . . . . .
354 0385 000. . . . . .
354 0658 000. . . . . .
408 0212 000. . . . . .
408 0216 000. . . . . .
610 0539 000. . . . . .
612 0543 000. . . . . .
612 0544 000. . . . . .
7-6
Description
QTY UM
CONTACT, PIN . . . . . . . . . . . . . . . . . . . . . . . . 50.0 EA
CONTACT, SOCKET . . . . . . . . . . . . . . . . . . . . 80.0 EA
TERMINAL PRESSURE. . . . . . . . . . . . . . . . . . . 2.0 EA
SHIELD 15 POSITION & . . . . . . . . . . . . . . . . . . 2.0 EA
SHIELD 25 POSITION . . . . . . . . . . . . . . . . . . . . 4.0 EA
PLUG 25 POS . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 EA
RECEPTACLE 205205-1 . . . . . . . . . . . . . . . . . . 2.0 EA
RECEPTACLE 205207-1 . . . . . . . . . . . . . . . . . . 2.0 EA
Reference Designators
888-2337-001
WARNING: Disconnect primary power prior to servicing.
2/17/04
Section VIII
Drawings
The following is a list of the drawings provided under separate
cover.
WIRING DIAG, M/A CONTROLLER
839 8118 399
SCHEM, MAIN/ALT CNTRLR
839 7994 101
SCHEM, DISPLAY BD.
839 7994 100
SCHEM, MAIN/ALT OR COMBINER CONTROLLER
839 8071 045
WIRING DIAG, MAIN/ALT THE-1
839 7968 191
WIRING DIAG, MAIN/ALT, DX
839 7968 192
WIRING DIAG, MAIN/ALT CONTROL
839 7968 202
WIRING DIAG,MAIN/ALT CTRL
839 8118 002
WIRING DIAG,M/A CONTLR SX
839 8118 322
WIRING DIAG,MAIN/ALT CTLR
839 8118 328
WIRING DIAG, MAIN/ALT CONTROLLER
839 8118 332
WIRING DIAG, M/A CNTRLLER HT 1/250/500 XMTR
839 8118 422
WIRING DIAG, M/A CNTRLLER PT 2/3/4/5/8/10 with Delta Switch
839 8118 423
WIRING DIAG, M/A CNTRLLER PT 2/3/4/5/8/10 with Dielectric Switch
WIRING DIAG, M/A CNTRLLER DX 100
11-18-94
839 8118 424
888-2337-001
WARNING: Disconnect primary power prior to servicing.
8-1
8-2
888-2337-001
WARNING: Disconnect primary power prior to servicing.
11-18-94