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GENERAL INFORMATION
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The Audiomatic Modei A-900 is a dual-track monaural tape recorder and
play two or four track prerecorded stereophonic tapes.
are:
player. It wili
Model A-900 features push-button control for each tape transport mode. These modes
Rewind, Record, Stop, Play, and Fast Forward.
Double track recording is used, giving two fuli length recordings on a reel of tape. Any
size reel up to ?" can be used. A record level indicator is provided to simplify the record
level settlng. New recordings can be made on previously recorded tape since the erase head
is automatically positioned when the record button is depressed. Monaural recordings can be
made from a radio, televj.sion receiver, or phonograph in addition to those made directly from
the microphone.
This recorder has two tape speeds, ?.50 inches per second, and
tracks, the recording time is as follows:
3. ?4 inches
Using both
Reel Size
5" (600 ft. )
?" (1200 ft. )
Connect this recorder to a
3.75 Speed
?.50 Speed
2 hour
I hour
l/
2 hours
ll? volt,
per second.
I hour
60 cycles, AC supply only.
Supplied
By:
Continental lambic I nc.,
6842 W. Archer,
Chicago, lllinois
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HCDWARD W. SAlUtS &
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The lieting of any available replacement part herein does
not constitute in any case a recommendation, warranty or
guarantyby Howard W. Sams & Co,, Inc., as to the quality
and suitability of such replacement part. The numbers of
these parts have been compiled from information furnished
to Howard W. Sams & Co., Inc., by the manufacturers of
cQ4??
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G O.r
I N |E.
lndianapolis
the particular
t1rye
6, lndiana
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of replacement part listed. Repro-
duction or use, without express permission, of editorial or
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pictorial content, in any manner, le prohibited. No patent
liability is assumed wlth reepect to the uee of the lnforma-
tion contained herein. @ tgOt Howard W. Sams & Co. , Inc. ,
Indianapolis 6, Indiana.
Printed tn U.S. of Amerlca
DATI
12
-
61
sET 558
CJI
rotDtR
TAPE INDICATOR
SPEED CONTROL
RECORD LOCK
SPEAKER
MONITOR
LEFT CHANNEL
CONTROLS
RECORD LEVEL
INDICATOR
TONE
VOLUME
REWIND RECORD STOP PLAY FAST FWD.
Fig.
l.
Audiomatic A-900 with cabinet top removed.
TECHN
I
CAL SPECIF I CATI ONS
AUDIOMATIC MODEL A.9OO
Amplifier
Stereo Input:
InSTOP position, both serve as low level inputs
for using the recorder as a complete amplifier'
For
stereo, both are used; monaurally, either
can be
Recording
used.
Input:
For recordingdirectlyfrom radio or TV or from
the Model P-902 phonograph.
Sing A-Long InPut:
Permits use of microphone when playing tape or
reeords"
2
Ext. spkrs:
For earphone monitoring or operation of external
speaker system. Also can be used as variable
outputs for feeding external amplifier or builtin Hi-Fi systems.
Volume Controls (Two):
Bothbass andtreble compensated. Independently
controls output of each channel.
Output:
6
watts peak (stereo).
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2. Top View of mechanism
with baseplate overlay removed.
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Tube Complement:
1--5y3, 2-Power
ECC82
/L2AV7, 2--ECL82/68M8.
Supp1y:
Heavy duty, transformer type, hum and noise
shielded. 11?VAC, 112 watts.
Frequency Response:
40 to 15,000 cps @ 7 L/2 ips + 3 db.
Bias Frequency:
80r000 cycles, for distortion-free recording.
Tone Controls (Two):
Full range, from maximum brilliance to rich
bass tone. Independent control of each channel
for best listening pleasure.
General
Record Indicator:
Easy view, tube type (tuning eye).
Size:
Harmonic Distortion:
Weight:
5% at peak output.
Speakers:
2--5" x 7" heavy permanent magnet, extended
range matched speakers. Acoustically baffled
with On-Off monitoring switch"
Chassis:
Heavy aluminum, fully shielded.
Signal To Noise Ratio:
40 db minimum"
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L87/9"xg 3/4,'x15L/4"
39 lbs.
Storage Compartment:
For tape, reels, AC cord, and microphone.
Public Address System:
Can be used while recording.
AC Outlet:
Located on rear panel. Provides AC outlet for
phonograph, etc.
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Duplicating Tapes:
Using two units exact copies can be made.
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Wow and Flutter:
Standard Accessories:
l-Humi-Seal Crystd Microphone, 1-?" empty
reel, 1-5" reel of tape, f-instruction bookr 1warranty certificate.
Acces
sories Available:
Patch cords - for recording from radio, phono,
TV.
Duplicating cords
Tape.Transport
- for
copying tapes.
.35%
Tape Indicator:
By integral numbers, easily reset, giving instantaneous s election.
Record-Playback Head:
Stacked in-Iine, combined
Motor:
ips.
a m i c all y balanced, vibration free. Heavy
duty, constant speed, 4-pole shaded--l?00 rpm.
Contains lifetime, self-aligned, select fit oilite
bearings. Motor mounted on special isolation
Dyn
Rapid forward and rewind.
Tape Reel Size:
3tt, 5tt, or ?tt.
Record Lock:
Safety feature
t/4 or L/2 ftack,
fully shielded .0002 gaps.
d
Tape Speed:
3 3/4 and 1 L/2
or less-? t/2 ips speed.
type floating mounts.
to prevent
accidental erasure.
Erase:
Patented permanent magnet, diagonal gap, positive, automatic.
Controls:
Flywheel:
Balanced, zinc
die cast.
Unit Mounting Plate:
Sturdy one piece aluminum die-cast metal-other parts placed for protection.
Cooling:
Fult pushbutton operation, all modes.
4" fan, forced ventilation.
SPECIFICATIONS
MODEL
P-902
STEREOPHONIC PHONO DI SC.TURNTABLE
( ACCESSoRY
)
Weight:
Speeds:
3-speed manual turntable-33
l/31
45.-
Approximately 8 lbs.
and ?8 rpm.
Cartri{ge:
Size:
Neutral Fosition:
Case:
14tix8ttx5il.
Stereophonlc cartridge with turnover needle.
Portable with cover and handle.
To prevent drive wheel '{l.at spots'when not in
use.
Cables:
For either monaural or stereophonic reproduc-
tion.
SPECIF ICATIONS
MODEL
S-9OI
DUAL EKTS{SION SPEAKIR5
( ACCESSORY )
Carrying Case:
E<tra Speaker jack:
Erables use of both speakers monaurally for
Portable, separates into two separate tone bal-
greater volume and coverage.
anced speakers.
Case Complement:
Weight:
Approximately 18 lbs.
Each unit consists of one-8" permanent magnet
speaker and one-3" tweeter. Crossover network used in each unit.
lO-Foot Leads:
2-used, for plugging into Audiomatic extension
speaker jacks.
4
Size:
L5
l/2"
x 14" x 12".
FUNCTIONS OF CONTROLS & PUSHBUTTONS
0n-0ff, Tone, Volume - Right Channel
This is a dual control located at the extreme
Iower right side of the top panel. The large outer rim
controls the volumeof the sound from the right channel
speaker when playing stereo. The small inner knob
turns the Audiomatic 'bn" and also is used to adjust
the tone from the right channel spealer.
Speaker Monitor
This controlislocated to the left of the ON-OFF
switch. Itservesas a monitor control so that Jrou czul
listen to sound as it is being recorded monaurally.
Turning this control to the right (clockwise) turns on
the left internal speaker. Turned to the left, the speaker
is disconnected. TheSPEAKffi. MONITOR switch does
not control the right internal speaker or extension
speakers.
Tone, Volume
- Left Channel
This, also, is a dual control, located at the extre'meleft on the top panel. The large outer rim controls the volume of the left channel speaker. The small
innerknobisusedtoadjustthe tone from the left chan-
Rewind Button
This button is used to transfer the tape rapidly
from the right (ta.ke-up) reel to the left (supply) reel
at high speed.
Record Button
This button is used to start the Audiomatic recording any sound being fed to the tape from microphone, radio, TV, phonograph, or telephone.
Note: TIIE RECORD LOCK MUST BE TURND BEFORE THE RECORD BUTTONCANBEDEPRESSED.
Stop Button
This button is us ed to stop tape travel after being
ineitherthePLAY, RECORD, FORWARD, or REWIND
modes. It is also a safety feature and must always be
left pressed down when the recorder is not in use.
Play Button
This buttonis used to start the Audiomatic play-
nel speaker.
ing back any recording that is on the tape, monaural
or stereophonic.
Record Lock
Foruard Button
This knob serves to prevent recordings from
being accidentally erased by pressing the RECORD
This button is used to transfer the tape rapidly
from the left reel to the right reel without recording
pushbutton by mistake.
NOTE: THIS KNOB MI'ST BE TURNED TOTHERIGHT
(CLOCKWTSE) BEFORE THE RECORD BUTTON CAN BE DEPRESSED.
Speed Control
The SPEED knob should point to ?.50 or 3.?5
according to the speed desired. The Audiomatic has
two tape speeds, 7.50-inches-per-second and 3.75inches-per-second. Insofar as quality of recording
reproduction is concerned. Speed is an important
factor. The higher the speed, generally, the greater
will be the fidelity.
Caution: DonotturntheSPEED knob unless the
STOP button'is depressed.
or playing back"
Tape I ndicator
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Setthe counter to zero by turning its reset knob
toward the rear of the recorder when starting to record or play back a reel of tape. If the reading of the
counter is nqted at various points in the tape travel,
newprogram selections can be indexed, or previously
recorded selections can be located with great accuracy.
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Record Level lndicator
The RECORD LEVEL indicator gives a visual
of the correct volume setting for the RECORD function. Adjustthel EFT CHANNEL VOLIJME
control to the point where the RECORD LEVEL indicator does not quite close on peak passages.
analysis
REAR PANEL CONNECTIONS
Ext. Spkrs.
-
Left and Right
These jacks provide a connection for external
speakers. When external speakers are used, the internal speakers are automatically disconnected.
Sing A-Long
By inserting the microphone plug into the Sing
A-'Long jack, the operator can aecompary phonograph
recordsormonaural tapes without his voice being recorded on the tape.
Mic. lnput
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The microphone may be plugged into this jack rrt
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for recording or for public address use.
vr
Recording lnput
Stereo lnput
This jaek is designed to connect the audio signals from a radio, phonograph, or television receiver
to the recorder for recording purposes.
thetwophonopick-up cables from a stereo phonograph
to the recorder for playing stereo records.
These input jacks are designed for connecting
OPERATI NG I NSTRUCTIONS
Preparation For Operation
1. Remove the AC power cord, reel of tape, empty
reel, andthe microphone from the rear compartment.
2. Depress the STOP birtton.
3. Plug the AC cord into a convenient wall receptacle
of the proper rating.
4. SetSPEEDcontrol lmob in the 3.75 or 7.50 position
as desired.
Caution: DonotturnSPEEDcontrol knob unless
button is depressed.
STOP
When the forward or reverse buttons are depressed, the RECORD and PLAY buttons are locked
io that they cannot be pressed down, with, the possibility of spilling tape. The buttons should always be
pressed down firmly until they latch. The STOP button must be depressed before changing functions or
speeds of the recorder.
Important: Always depress the STOP button when the
recorder is not in use.
2. With the STOP button depressed, turn the ON-OFF
TONE control to the right (clockwise) until a click is
heard. Allow the recorder to warm-up until the RECORD LEVEL indicator glows green.
3. Place the SPEED knob in the position desired. As
a general rule, 3.?5-inches per second for voice, and
?.50-inches per second for music.
4. Turn the RECORD LOCK to the right with the left
handandwiththe right hand depress the RECORD button--then release the RECORD LOCK.
5" While holding the microphone about 3-4-inches away
from the mouth, speak in a normal tone of voice and
adjust the LEFT' CHANNEL-VOLUME control to the
point where the RECORD LEVEL indicator does not
quite close on Peak Passages.
Note: To monitor the sound being recorded, turn the
SPEAKffiMOMTORcontroltothe right. Care
f ar enough
from the recorder to prevent squeal due to a-
must be taken to keep the microphone
coustic feedback.
Rayind
(< ) 0r Fast Forward (>)
it is desirable to play a certain portion of
again, it is not necessary to revind the
over
a tape
entire reel. By depressing the rewind (<) button the
tapewill reverse at a rapid speed. By depressing the
fastforward (>) buttonthetapewilladvance at a rapid
When
Threading The Tape
pan (left) making
certainthereel slots catch the protrusions of the pan.
1. Placea reel of tape on the supply
2. Place an empty reel, the same sizeor larger, on the
take-uppan (right). Again make certain the reel slots
catch the protrusions of the Pan.
speed.
3. Releasethe STOP button by pressing lightly on any
one of the other four pushbuttons so that all buttons
are in the released position. This releases the tape
brakes, simplifying tape threading.
Whileitis possible to record sound from an external source simply by placing the microphone in
frontof thespeaker, thisis not recommended as backgroun<i noises will be recorded along with the desired
4. Unwind about 14-inches of tape from the supply
reel. Hold a section of tape straight with both hands
and insert the tape in the tape slot making sure that
the dull coated side of the tape faces away from the
the speaker voice coil terminals of the radio or TV
receiver. For this purpose, a patch cord is available
To Record From Radio
0r
TV
program material.
For noisefree recordings, record directly from
operator (toward rear of unit).
frorn your Audiomatic dealer.
5. Insert the free end of the tape into the slot in the
reel. While holding the tape in place,
give the reel two or three turns to secure the tape to
CORDING INPLII located on the rear panel of the Audio-
hub of the empty
the reel.
Note:
3. Adjust the volume control of the radio or TV at
normal roomvolume. Setthe tone control of the radio
To Record From Microphone
6
matic.
2. Connect the patch cord alligator clips to the radio
or TV receivers voice coil terminals.
Do not route tape around tape post.
1. Insert the microphone plug into the MIC. jack
cated on the rear Panel.
1. Insert the plug end of the patch cord into the RE-
1o-
or TV at full treble.
4. Proceedwithrecordingas described under rllo
Re-
cord From Microphone'i.
2. Set the SPEH) knob to the speed at which the recording was made.
3. Place SPEAKER MOMTOR control in the 'bn"
To Record From Phonograph
1. Plug one of the phono turntable output cables into
theRECORDINGINPU'I jacklocated on the rear panel.
2. Insert AC cordfromphonographinto 11?V"A.C. outlet on rear panel.
3. Start turntable and proceed with recording as described under rTo Record From Microphone".
Note: Themicrophone should not be connected to the
Audio mati c when recording from another
source. Also, when the recording is played
backo thephonooutputcable should be removed
from the RECORDING INPUT jack.
position.
4. Adjust the
RIGHT and LEFT VOLITME and TONE
controls for desired listening level.
Sing A-Long Use With Phono
1. Place a record on the turntable and plug one of the
phono output cables into the jack on the back panel
marked RECORDING INPUT.
2. Insert mic:rophone plug into the jack on the back
panel marked SIIIG A-LONG.
3. Starttheturntableand adjust the LEFT CHANNELVOLUME control for desired listening level.
To Use Second Track
1. Depress the STOP button
4. Sing into the microphone and adjust the RIGHT
when the tape has been
wound onto the take-up reel.
CHANNEL-VOLUME control until the sounds coming
from the right-hand speal<er blend rvith the music
2. Removetake-upreel, turn over, andplaceonsuppiy
paJl.
coming from the left-hand speaker.
Sing A-Long Use With
3. Place empty reel
on take-up pan.
In addition to accompanying phonograph records,
4. Thread tape and proceed with recording
viously described.
Tape
as pre-
To Play Monaural Recordings
CHANNEL-VOL IJME control.
1. Thread tape as described under "Threading The
2. Plug microphone into jack marked SING A-LONG,
sing into microphone and advance RIGHT CHANNELVOLUME control to the point where your voice blends
2. Set the SPED knob to the speed at which the recording was made.
position.
4. Turn the RIGHT CHANNEL-VOLIjME control to
To Use As Public Address System
5. PressthePlAYbuttonand adjust the LEFT CHAN-
With the STOP button pressed down, speak directly into the microphone, setting the LEFT CHAN-
minimum.
NEL-VOL UME and TONE controls for desired listening
leveI.
To Play Stereophonic Tape
1. Thread tape as described under 'lThreading The
Tape".
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with the music.
Caution: You cannot record your voice along with the
taped program. If the RECORD button is
depressed, the tape will be erased.
3. Place SPEAKffi, MONITOR control in the "on"
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tape and narrate at the same time.
1. Playthetapeinthenormal manner, adjusting LEFT
Tape".
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you can record monaural selections, then play the
F
NEL-VOLIIME and TONE controls for desired listening level and tone"
Caution: Holdthemicrophoneasfar away as possible
from the left speaker to prevent squeal due
to acoustic feedback.
DISASSTMBLY INSTRUCTIONS
To Remove Unit From Case
(
Ref
er to Exploded View)
1. Remove push-on type speed shift knob (3), the top
and bottom of dual control knobs (14), (16), (22), and
(23), and the dummy dual control knobs (20) and (2a).
2. Removethetwoscrews, (9) and (10), from the front
escutcheon (11). Remove escutcheon.
3. Remove screw (5) from rear escutcheon (6). Remove escutcheon.
4. Remove tape guide post
(15).
5. Remove screws (18) that mount the front escutcheon
mounting brackets"
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6.
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Remove the two scre\rrs holding the unit in the cabinet
(located at top of storage compartment)"
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?. Remove baseplate overlaY (12).
To Remove Amplifier From Transport Mechanism
8. Remove the two serewsr located at front of baseplate, holding unit in cabinet.
the amplifier chassis"
1. Remove
the motor and power
"U" shaped bracket
Remove
compartment.
in storage
"U" shaped bracket
from storage comPartment.
2. Remove the four
head terminals.
Remove the four s crevfs holding the two sub-panels
to the rear panel"
chassis.
9. Removethefour
screqrs holding
10.
Push the two sub-panels through the holes in the
11.
rear of the
ca.binet.
hea.d
transformer plug from
leads from the play-record
3. Remove tnto screws from each end of amplifier
away from the transport
mechanism and disconnect the play-record switch arm
4. Carefullylifttheamplifier
link (104).
12. Lift tape transport and amplifier assembly partially out o] cabinet. Unplug four speaker leads and
speaker monitor plug before removing unit completely'
MECHAN I CAL A DJ
U
STMENTS
Pressure Pad Adjustment
Exploded View)
( Refer to
TAPE
1, Remove front escutcheon (11).
I
2. Depress the PLAY button. Do not turn the Audiomatic tbn".
3. Useapenciltype postal scale and check the
amount
necessary to just pull the right-hand pad
awayfrom the play-record head (57)" The test should
of pressure
be made at the right-hand end of ttre pressure pad
mounting spring. If necessary, adjust locked adjustment scielv'(42iuntil a reading of t 3/4'oz. *l/4-oz'
is obtained.
4" The guide post pressure pad (Ieft-hand pad) is adjusted by bending the pressure pad spring (35). Adjust for minimum pressure against tape.
Fig.
3.
Erase head tape Path.
(junctionof long diagonat slot and short vertical slot).
3. To adjust the level of the tape, loosen
set screw (44) and rotate tape guide post (45) to move
tape up or down. See H<Ploded View.
See Figure
Brake Shoe Adjustment
Erase Head Adjustment
1. With tape properly thr eaded, turn r ecorder'bn " and
depress the RECORD button. Allow tape to run for a
f err seconds then turn recorder 'bff ", but leave RECORD
button depressed.
(
Ref
er to
ExPloded View)
1. Withall pushbuttons in the 'tp" position, the brake
pads (90) should clear brake drums (10? and 109) by
approximately
2. With front escutcheon (11) and rear escutcheon (6)
removed, checkerase tread (52) to see if it is parallel
with the taPe.
3" Check to see if the top edge of the tape coincides
rvith the top end of the diagonal slot in the erase head
t/8",
2. DepresstheSTOP button while observing the brake
pads. Both brake pads must contact the brake drums
at the same time and with equal pressure.
3.
If
necessary, adjust by bending brake spring (91).
CLEAN ING
The majority of defects, other than wear or
breakage, can be traced to dirty surfaces. The play-
recordtread (5?), capstan, andpressureroller (67) are
subjectto an accumulation of tape coating oxide, which
is worn off the tape as it passes these parts. This
accumulation should be periodically removed since it
Wipe
will cause faint recording and poor playback'dirt
is
these surfaces carefully with a clean cloth. If
caked or hard and will not come off with a dry cloth,
dampen cloth with alcohol or lighter fluid.
7
Fig.
4.
Bottom vi€r,v of transport mechanism.
LUBRICATION
All rotating parts are provided with generous
sizeoilitebearings which are factory lubricated" Under normal use no further lubrication is necessary.
In heavy duty service, the following parts should be
lubricated once a ye:rr with a drop of # 10 motor oil:
The basic rule is - do not over lubricate. Oil
mustbekeptoff all rubber idlers, belts, and periphery
of flyrheelandoff partsthatmighttransfer oil to them.
1. The top
lubrieated.
and bottom motor bearings"
2. The capstan bearing.
3" Pressure roller (67) bearings.
4. All idler
5. The reel
pan bearings.
Always wipe excess lubricant from parts that have been
An occasional cleaning out of foreign matter unthe pushbuttons is desirable, and a drop of oil on
the sliding lever members is advisable.
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5. Bottom view of transport mechanism - motor mounting plate removd.
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PHOTOFACT "EXPLODED' VIEW
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7.
Top vieuv
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of motor mounting plate.
CAL
A DJU STMENTS
2. Clean pole pieces of play-record head (5?) with
Hum Adjustment
Place unit
alcohol or lighter fluid.
in
PLAY position; Left Channel-
3. Thread alignment tape on recorder. Turn Left
VOLUME at maximum and Left Channel-TONE at full
bass. Connect a VTVM to the LEFT Ext. Spkr. jack.
Setthe VTVM to AC, 3 volt scale, with a 3.3 ohm load
resistor across the meter. Adjust hum control (R3)
for mininium deflection on meter.
Channel-VOLtIME
TONE to
to
full treble.
ma:rimum,
ild Left Channel-
4" Conneet a VT\IM to LEFT Ert" Spkr. iack. Set the
meter to AC, 3 volt seale,
5. Place reeorder in PLAY position, 7 t/Z-ineh per
Play-Record Head Alignment
second speed. DeereaseVOLUME to point where output is l-volt on meter. Turn play-record head ad-
1. Remove front escutcheon (11) and rear escutcheon
justment screw (57, Fig. 2) until manimum point of
deflection on meter is obtained.
(6),
TROUBLE CHART
Cause
Symptom
Push buttons fail to latch
into position.
No drive in Play or Record.
1. Lock plate spring (80) disconneeted or
1o Connect or replace
broken.
spring (80).
1. Idlertensionsprings (138) disconneeted
or broken.
1. Connect or
2. Idler slideplate
Tape fails to wind on takeup reel during
Playor Re-
Remedy
(124) bindingon bushing
idler wheel (123)
replaee
springs (138).
2. Check slide plate (124)
(126), thus prwenting
from moving forward.
andbushing (126) for burrs.
Clean with alcohol.
1" Reel drive spring {70) loose, dismnnected, or broken.
1. Connect or
2. Reel pan shaft (2) binding.
2. Clean foreign matter
from bearing surface and
shaft with a clean cloth.
replace
spring (70).
cord"
Lubricate with one drop of
# 10 motor oil.
No Fast Forward or Rewind.
t2
1. Idler lever tension spring (9?) disconor broken, thereby not actuating
idler lever (100).
nected
1. Connect or
spring (97).
replace
TROUBLE CHART
Symptom
( COnt,d}
Cause
Remedy
2. Idlerdrivebelt(118)broken or not properly connected.
Tape spills whenStop but-
ton is depressed during
fast Forward or Rewind.
'\ilow" during operation
of recorder.
"Flutt er " duringoper-
ation of recorder.
No erase or erase is incomplete.
1. Brake
2. Replace idler drive belt
(118).
1.
shoes out of adjustment.
See "BrakeShoe Adjust-
ment"
under Mechanical
Adjustments.
2. Brake pads worn out or missing.
2. Replace brake pads.
1. Brake return spring (92) disconnected
or broken.
1. Connect or
replace
spring (92).
2. Check all driving surfaces for oil or
foreign matter"
alcohol.
1. Dirty play-record head (57), pressure
pads, capstan shaft or pressure roller (6?).
1. Clean as described under 'Cleaning".
1. Erase head tension spring
(40) discon-
1, Connect or
and
replace
spring (40).
nected or broken.
2. Erase
2. Clean with a cloth
head (52) not adjusted properly"
2. See "Erase Head Adjustment" und er Mechanical
Adjustments.
Does not record.
1. Replace if
1. Faulty microphone or cord.
2. Faulty input jack.
er
necessarye
checking recorder
with another type of input,
C
2. Check and replace if ne-
>3
af t
ce$sary.
3.
4. Open
Motor and amplifier in-
piay-record head (5?).
t
.lo
4. Check continuity. After
ti3
checking for continuity, demagnetize head.
Irt
3. Check tubes.
Faulty tube.
g
o
o
('
F
1. Checkvoltages per sche-
1. Power supply defect.
matic.
operative"
2, Damaged
3.
2. Repair or replace.
power cord.
l.
Defective On-Off switch.
Replace switch.
AFAMP/OUTPUT
-rr
o
I
m
Fig.
v
8. Top view of amplifier.
\n
13
t4
Fig.
9.
Fig.
10.
Bottom view of amplifier showing capacitor locations'
Bottom viav of amplifier showing resistor locations.
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MECHANICAL PARTS LIST
Ref.
Part
No.
No.
1 I
2 I
3
c-13.318-3
+ |
5 I
n-zzs+-s
5?-4C-606-4
o-rr.+so-r
o
I
7 I 73-2340-r
lt|
73-2340-1
9
10
I
|
57-1C-804-4
| sz-zc-ao+-+
11 I C-35.1419-1
t2 I n-gs"r+so-r
r3 | sz-oc-ors-s
14 I c-rr"eez-r
15 | a-sz.zoz
16 I e-es.r+es-r
r7 I e-rs"ross-r
18 I SZ-ZC-AO+-r
19 I zs-zzt+-s
zo I c-rr.+eo
zr I tz-zzt+-s
zz I c-rr"a+z-r
23 I S-eS.r+gs-r
24 I c-rs"alo
25 I TS-ZZSq-S
26 I e-sr"rros-r
21 | n-ss"tros-z
28 I B-35.1369-3
29 | e-er.reos-t
30 | e-ss.rros-s
31 I r-rr.nu
I
ShaJt
Assry.
Nylon Reel Pan & Shaft
Assry.
Speed Shift Knob
FeIt Washer
# 6-32 x 3,/8" O"H.IvlS.
Rear Escutcheon
Varnish Impregnated
Washer
Varnish Impregnated
Washer
# 8-32 x 1/4" T.H.IWS.
# 8-32 x 1/4" T.H.M.S.
Front Escutcheon Ass'y.
Basepla.te Overlay SiIk
Screen Assey.
# 6-32 x 1" T.H.M.S"
Dual Control Knob, Top
Tape Guide Post
Dual Control Knob, Bottom
Front Escutcheon Mtg. Brkt.
# 8-32 x 1/4" T.H"I\4S.
FeIt Washer
Control Knob, Dummy DuaI
FeIt Washer
DuaI Control Knob, ToP
DuaI Control Knob, Bottom
Control Knob, Dummy Dual
Felt Washer
Nylon ReeI Pan &
I
c-1s.318-3
tt
I c-13.44s
I
Description
I
I
I
I
I
I
Push
Push
Push
Push
Push
Zt-ZZ+t-tAAp
il35 |I u-,n.ruu
8-19.892
86 I e-sr.rs+
s7 I s-sr.ss+
38 I SZ-rC-OOr-r
3e I c-rs.ars-z
40 | n-sr.aor
4r | 48-410-1
42 I 5?-16C-606-1
43 | n-u.eaz-r
44 I 57-343e-0
45 | e-sz.aoo
46 I 48-410-1
47 I e-:z.z6o
48 I e-sr.++e-z
4s I e-rs.rato-r
50 | sz-ros-ers-o
51 I Zr-ZZSr-e
iz I c-ss.zso
53 | a-as.rzrs
54 I 57-1C-603-1
I
ut
I
I as
I ss
uo
I
I ut
I oz
63
l6
II
I
|I
Assey.,
i
B-32.309
B-33.404*
68
69
D- 35.1436-1
I
I
70
I
7L
I
75
76
I
I
I
I
I
I
B-19.858-1
77
78
?9
80
B-19.859
B-31.33?
81
5?-21C-804-1
82
5?-21C-804-1
83
84
85
86
B-32.291
B- 31.498
B-19.1699
B-31.338
ot
B-19"1 364-1
88
89
90
73-2231-5
57-6C-806-1
91
B-35"10?0-1
B- 31.338
B-35.1046
B-35.835
73-2241-148F
B- 31.34 3
I
I
I
I
I
I
I
I
I
I
I
o-rz Hex Nut
+ a-zz x 3,28" R.H.IvLS.
Set Screw
Tape Guide Post
I # 6-32 He)<. Nut
I Tape Guide Post Spacer
I ntase Head Return Spring
I Erase Head Mtg. Plate
| + o-sz x 13,/16" R.H.IWS.
I
I
I #6Int.Lockwasher
I n"""" Head Assgy. Ass?yr
I einch Roller Plate
o-az x 3/16" B.H.M"s.
|
| *0Int.Lockwasher
Tape Guide Lug
Mounting Bracket, Record
+
Set Screv,/,
Hex Nut
Hex Nut
Pushbutton
Pushbutton
Pushbutton
Pushbutton
73
I
I
I
I
I
I
I
I
I
I
]
92
93
94
95
96
9?
98
99
100
101
Bristol
Retainer Bracket
Lever
Hinge Bracket
Return SPring
Locking Plate Spring
# 8-32 x 1/4" B"H.IVLS""
Sems
# 8-32
Sems
x 1/4" B"H.l4S.,
Shouldered Washer
48-222r
B-31.339
73-2340-1
Record
Record
Record
Spring
Record
Lock Link
Lock
Lock Return
Lock Mtg. Plate
# I Int. Lockwasher
# 8-32 x 3/8" R.H.]WS.
Brake Pad, Felt
Brake Spring Assey.
Brake Return Spring
Shift Plate Ass'y.
Brake Slide Plate Ass'y.
FIat Washer, Steel
# 10-32 Hex, Elastic Stop Nut
Idler Lever Tension Spring
Varnish Impregnated Washer
73-2248-39
Phenolic Washer
B-35.1051
Idler Lever Ass'!y.
B-32.2?5-1
# 8-32 Hex Hd. Shouldered
102
103
B- 35-1452
5?-3698-0
104
105
106
c-1 3.25?-1
I Record Actuating Lever Assry.
| + o-lz x8/16" Bristol Hd.
I
B-31.351
B-32.485
I
Hd.
+
I Head
I Spring, Record
B-16.104
I
B.H.M.S.
I
I
2
Screv,/
Plate
E"as" Head Tension Spring
+
Pinch Roller Tension
Spring
"8" Ring, 3/16" Shaft
Linen Washer
Pressure Roller
Shim Washer, Brass
Baseplate & Bearing Assry.
ReeI Drive Tension Spring
Record Lock Shaft
Record Lock Lever
12
I
Pressure Pad Spring
I t,/4 rract< Play-Record
I neaa
sz-toc-+oq-t I # 4-40 x 1/4" R.H.IvI.s"
ts-zz+t-ts+ I FIat washer, Steel
"-rn.nno
sz-s+sg-o
67*
I
Assty.,
n-ro.zs+
n-rs.sas
B-33.418B- 28.16 3
Record
I
|
65
66
Assry.,
| + 0-rz x 3/16"
I Plavback Slide
B- 31.360
I
Rewind
I r'"rt paa
I r"tt n"a, Play-Record
64
I
Record Slide Plate
I
I
Assty.,
I
Stop
PIay
Ass'?y., Fast
Forward
Push-On Stud Nut, 3/16"
Stud
FIat Washer
Playback Actuating Lever
I
32 I
Button
Button
Button
Button
Button
I
Head
O-fZ x 3/16" Bristol Hd.
I s"t s"ruw
I Tape-Guide Post, Right
B-31.333
5
7- 3589-1
c-35.1050-1
57-3589-1
Switch Lever Asssy"
# 8-32 x 3,/16" Bristol Hd.
Set Screrf
Switch Arm Link
-FlY'rheel
# 8-32 x 1/4"
Set Screrv
Bdstol
Hd.
Brake Drum & Bushing AssrY
# 8-32 x 1/4" Bristol Hd.
Set Scrertr
109
c-35.1050-1
110
57-3589-1
111
B-35.1044
Brake Drum & Bushing
Assry.
# 8-32 x 1,/4" Bristol Hd.
Set Screw
tt2
113
tl4
115
116
tLl
llg *
119
120
t2l
B-32.275-l
Sub ldler Plate Assry.
# 8-32 Hex Hd. Shoulder
Screw
Linen Washer
B-28.163
B- 33.405
Sub
13-2254-6
Felt Washer
B-28.16 3
B-35.1066
'B-28.
*
Sheave
Idler
Linen Washer
18I
B-33.418-2
Pulley Assry.
Idler Drive BeIt
"E" Ring, 3/16 "
Sha.ft
Motor Pulley
# 8-32 x 1/4" Bristol Hd.
B-32" 288
57-3589-1
Set Screrv
t22
B- 33.41 8-
I23*
B-33.408*
t24
B-35.1064-1
2
"E" Ring, 3/16 Shaft
Rubber Bonded Idler, 2 1/2"
Dia.
Idler Slide Plate Ass?y.
MECHANICAL PARTS LIST ( Cont,di
Ref.
Part
No.
No.
t25
57-6C-806-1
L26
L27
L28
129
130
131
t32
Description
73-2231-5
73-2241-t43
B-19.1431-1
B-32.291-1
B-31.32?
No.
Description
140
73-223L-5
t41
5?-6c-805-1
Flat Washer, Steel
Flat Washer, Steel
Idler Throw-Out Lever
t42
B-19.863
143
73-223t-5
L44
L45
57-6C-805-1
5?-6C-805-1
Int. Lockwasher
# 8-32 x 5/16" R"H.M.S.
Drive Mtg. Plate Bracket
# 8 Int. Lockwasher
# 8-32 x 5/16" R.H"M.S.
# 8-32 x 5/16" R"H"M"S"
146
D-35.1438
Drive Mtg. Plate &
141
B- 33.5
Digital Counter
Shouldered Washer
Idler Lift Compression
B-33.40?-1
5?-1 C-603-1
73-2231-4
Part
No.
# 8-32 x 3/16r'R"ILM.S"
Idler Slide Bushing
# 8 Int. Lockwasher
Spring
133
134
135
'Ref.
'€"Washer
# 6-32 x 3/16" B.IIM.S.
# 6 Int. Lockwasher
Bracket Assry.
148
r
B-28.
t49
36
175
*
150
"O" Ring
Motor Mtg. Plate
Shock Mount
136
B-19.961
Spring Clip
13?
c-35.816-1
Speed Control Shaft Assey.
138
B-31.324
Idler Tension Spring,
t52
35.1053- 2
B-19.86
(2 req.)
Angle Brkt. for Mtg.
Drive Assiy"
153
139
L54
B-33.534
B-33.643
2
#8
B-33.41 1
48-222L
151
155
Flat Washer
# 10-32 Eastic Stop Nut
Motor Assly.
Nylon Cable Clamp
4" Fan Blade
r Ref. No. 67, Presgure Roller, WALSCO part #l4b?.
* nef. No. U8, Idler Drive Belt, WALSCO part #l4l0-0?.
* Ref. No. 123, Rubber Bonded ldler, WALSCO part
* Ref. No. 148, "O" Rlng, WALSCO Part #1410-0?. #1430.
c
I
o
>=
,io !
ti
=
o
I
llt
F
CABINET PARTS LIST
c-35.1 3?5-1
c-35.1 3?6-1
c-35.L417-2
c-35.1450:1
B-19.864-2
20-2089-1
c-30.363-1
33.630-1
33.6 30-2
48-1C-20-0
48-2151
48-2220-r
5?-43C-608-4
57-43C-8 20-0
57-46c-612-4
Handle Plate Assembly
Handle Assembly
Monitor Switch Harness Ass'y.
Baffle Assembly
Cabinet Fastener Clips
Plastic Beading, White
5!r x 7" Speaker, 3.2 ohm
Plastic Bumper, White, 3rl8"
Plastic Bumper, White, 3/4"
#L/4-20 Hex Nut
#8-32 Tinnerman Push-On Nut
#8-32 x L7/32Kqs Hex Nut
# xL/2 F"H.W.S.
#8 xl l/4 F.H.W.S.
#6
x 3/4 R"H"W.S.
xL/2
ffi x 3/8
5?-66A-508-4
57-66A-606-0
#5
5?-3550
#8-32 x 1 1/4 Wing Shank
Flat Washer
Catch, Brass
Covering Material (Outside)
Covering Material (Inside)
73-224t-131
8?-31 70-1
503-l 93-1
503-1 93- 2
R"H.S.lvr.S"
R.H.S.ilr"S"
503-1 93- 3
503-193-4
503-193-5
503-1 93-6
503-1 93-?
503-193-8
50?-85 2
50?-1026
50?-1027
50?-1028
509-231
.510-6-49
510-?8.
5-1
5-1
515-1
515-1
51 5-1
515-1
51
51
Covering Material (Inside R.H.)
Covering Material (Inside L.H.)
Covering Material (Bottom)
Covering Material (Case R.H.)
Covering Material (Case L.H.)
Covering Material (Inside Compt.
Front Mounting Rail
Side Mounting Rail, R.H.
Side Mounting Rail, L.H.
Rear Mounting Rail
Block
Glue Block, L/2 x 1/2 x 4
Glue Block, l/2 x L/2 x 4
Front Panel
349
350
351
Side Panel, R.H.
Side Panel, L.H"
352
Rear Panel
35 3
Top Panel
Bottom Panel
354
518-65
520-100
537-83
'ft
o
1g
rfl
F
Partition Panel
Filler
Speaker Baffle
\.n
T7
ACCESSORY STEREO PHONO TURNTABLE
MODIL P-902 PARTS LIST
Part
Part
Description
No.
503-192-1
503-192- 2
503-192- 3
504-25
Handle Plate
B-19.1681
504-25
B-11.287
Motor Eloard
B-20.241-t
B-23.239
B- 33.599-4
B- 33.618-2
B-33"6 20-3
Description
No.
Slide Switch, S.P.D"T.
Line Cord w/Pl,tgr 6r, GraY
Terminal StriP
Shielded Cord & Concentric
Plug, 60", Gray
Tone Arm Assembly (Black)
507-100?-3
s0?-100?-4
50?-100?-5
5L5-1214
Covering Material (ToP)
Covering Material (Inside Lid)
Covering Material (Bottom)
Motor Board
Mounting Rail, Rear
Mounting Rail, Front
Mounting Rail, Sides
Rear Panel
5-1 2?5
515-1 2?6
515-1 355
Side Panel
Top & Bottom Panel
Handle AssemblY
Plastic Beading (White)
33.630-1
Plastic Bumper (White) 3/8"
8-2499-1
D-35.1446-1
57-44C-612-4
48-1C-21-0
5?-43C-608-4
5?-66A-508-4
13-2241-t37
8?-3164-2
+l/4-20 Hex Nut
73-2240-L15
B-3.108- 2
Cabinet Assembly
Motor Board Final AssemblY
ffi x3/4 o"H.w.S.
#6 Finishing Washer
Paper Tubular Cap. 2.5 mfd
@ 5ov
Jack, Open Circuit, 2 Cond.
t05-222
35.13 ?2 - 1
c-35.13?6-3
20- 2089-1
87- 31?0- 2
3 Speed
Motor w/8" Turntable
51
P.G. Butt Connector
Handle Plate AssemblY
lfr xr/2
F.H.W"S.
#5
R.II"S.IvtS"
xl/2
B-
#5/8 FIat Washer
Tack, Brass Plt.
Catch, Brass Plt.
3
3.5
28-1
Front Panel
(1/4" Bushing)
ACCESSORY DUAL EXTENSION SPEAKERS
MODEL S-9OI PARTS LIST
Part
No.
503-195-1
514-8-2
c-35.1 384-2
B- 31.495
B-32.483
8-2500-1
c- 35.1444-1
c-35.1445-1
Baffle Board Final Ass'Y.
1-33.572-1
lvlolded Plug Assembly (GraY)
#3/8-32 Hex Nut, Double
48-221 3-1
57-44C-816-4
73-2240-L16
73-2243-70
48- 21 51
57- 3549-0
145-1 25-1
537-84
53?-85
c-35.1443-1
c-35.L442-t
2
.c- 30.356 - 3
18
Covering Material
Dowel Rod 4 5/8"
Dowel Rod Assembly
Hinge Pin
Handle Mounting Post
Speaker Case AssemblY
Baffle Board Final AssrY.
B-3.108-
Part
.No.
Description
I
I
I
(Left)
(night)
Chamfered
#8 x 1 O.H.W"S.
#8 Finishing Washer
Flat Washer
#8-32 Tinnerman, Push-On
#8-32 x 1 Wing Shank Screw
Plastic Grille (Gold)
Speaker Baffle (Right)
Speal<er Baffle (Left)
Baffle Assembly (Left)
Baffle Assembly (Right)
Paper Tub. Cap.
2.5 mfd @ 50 V
3 l/2" 5q. P.NI. Speaker'_8 ohm
Description
D- 30.366 - 2
8" P"M. Speaker,
48-1C-15-1
57-46C-506-1
#8-32 Hex Nut
?3- 2231- 5
B-19.1680
c- 35.1 3?6-2
35.1 379-1
33.630-2
48-1C-21-0
57-43C-608-4
5?-66A-508-4
#5
#8
8 ohm
x 3/8 R.H.W.S.
Int. Lockwasher
Handle Plate
Handle Assembly
Handle Plate Assembly
Plastic Bumper (White) 3/4"
#L/4-20 Hex Nut
#6-1l2 F.H.W"S.
+5
x1/2
R.H.s"rvI.s.
73-2241-L37
FIat Washer
87-31?0-1
Catch
503-194
50?-973
507-1037
50?-1038
Covering Material
Locating Rail
Mounting Rail
Mounting Rail
Glue Block, l/Nt' x L/2t' x 4"
Bottom Panel
Front & Rear Panel
Side Parel, R.H.
Side Panel, L.H.
Top Panel
Baffle Board, Right
BaJfle Board, Left
510-6-49
515-1 213
51 5-1 21 5
5L5-12L7
515-1 218
515-1 356
537-84
537-85
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PAGE 20
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