SHEFR\ATOOD
M o D E L5 - 9 4 0 0
s T E R E O / D Y N A Q UAAMDP L I FI E R
5 E R V I C EM A N U A L
0
$
r
L\
LOW FILTER
When depresged
reduces rumble
from turntable
and low
frequency noise.
(Attenuates at
12 db/octave).
SELECTOR
coltTRoL
Selects your
stereo listening
source: PHONO
1, PHONO2/
MIC,TUNER,
A U X . 1 ,A U X . 2 .
HI FITTER
When depressed
cuts off scratch
from records,br
background
"hiss" trom noisy
FM stations.
(Attenual* at
12 db/octave).
TAPE TOI{ITOR
Permits
recording to, or
(depressed)
playing back
from tape
rscorder; permits
monltorlng
during recording.
ILLUTIilATED
SELECTOR
IIIDICATOR
Describes
position of
selector swltch.
BASS
Increases bass
tones up to *12
db, decreases
up to -12 db.
SPEAKERS
S€lects your
main stgreo
IODE SWITCH
speakers (A),
remote stereo Permits listening
to left channel
speakers (B),
BAtJAIiICE
only, right
both sets, or
Balanceethe
channelonly,
relative volume turns speakers
stereo, reverse or
levels between
off (for
your right and
mono-through
headphone
listening).
both speakers.
left speakers.
TREBLE
lncreases treble
tones up to *12
db, decreases
up to -12 db.
TAPE DUBBING
PHO]IEE
Permits
For private
recording to, or listening with
playing back
stereo
from, a second
headphones.
tape recorder.
Also, permits
dubbingfrom
one recorder to
the other.
touDNEss
Masler power
ON/OFF and
volume control
for your
speakers. Also
automatically
add bass
compensation
at low levels.
FOURCHATTINEL DYITIAOUAD
Controls special Controls built-in
rear panel inpuls
Dynaquad
and outputs for
4 channel
a 4 channel
matrixing circuit.
decoder (may
also be used as
a second tape
monitor).
SPECIFICATIONS
PowerOulput:Musicpower160wattstotal (lHF)
RllS PowerOutpul(bothchannelsdriven):
6 0 w a t t s x 2 @ 4o h m sl, K H z
50 wattsx2 @8 ohms,1 KHz
40 wattsx2 @8 ohms,20-20,000Hz
HarmonicDlstortlon:
0.8olo
I ohmratedoutput,0.10o/o
@10 watts.
lnlermodulationDlsioilldn:
0.60/o@8 ohm ratedoutput, O.25o/o
@10watts.
Slereo and lllono SpeakerOutpul lmpedance:
4 , 8 ,o r 1 6o h m s .
StereoHeadphoneOutput:Highor low impedance.
StereoRecordingOutput:230mv,2Kohm.
Power Bandwidth:5-45 KHz-lo/oDist.
FrequencyRerponre: Aux.20-20KHz-t- y2 db.
Phone:RIAAStd.i 1.0db.
DamplngFactor:40:1@I ohms.
BassConlrol:-f- 12 db. @100Hz.
TrebleConlrol: + 12 db @10 KHz.
LOUONESS
When depressed,
defeats loudness
control
compensation
circuit (which
automatically
increases bass
tones at low
volumelevels).
Input Senrltlvfi (for ratedoutput):
Phono,1.8mv.
mv,
Auxiliary,200
mv
Mic.,2.1
Input Gapabllitylor 1olodist.:
mv.
Phono,80
lnfinite
Auxiliary,
M i c . , 6 0m v
Hun and l{oise (lHF}: Phono-60 db.
Aux.-85db.
Vol.ControlMin.-90db.
Crosrtalk: -45 db @1 KHz.
o
tlc. Input lmpedance:50,000
GENERAL:
PowerRequiremenb:
115-125V,50/60 Hz. 20-200watls tused.
AG Outletr: Switched(2) total 180watts.
(1)200watts.
Unswilched
Slze: (X)"H, OOoW, 00" D.
ShlpplngWelght:29 lbs.
DUPLICATEO
S N O T H E RD R I V E RB D .
TR509
TR504 R525
VR501
T R 5 0 BI R 6 2 4 1T R 5 0 5
P R E - A M PB D
TR701b
TR704
TR701a
TR7O5
TR702
TR 7 O 6
VR7O1
TR 7 O 3
cB52
TR902b
TR9DZa
c 8s 1
T R 9 0b1
c 85 3
TR901a
c 85 4
Page 2
Figure 1
5 - 9 4 0 0 A M P L I F I T R S E R V I C I N GA N D A D J U S T M E N T
N O T E : To simplify
the following
descriptions
only the left
channel
and its related circuitries
are described.
The right channel
( See scheis identicaL
e x c e p t f o r r e f e r e n c e s y m b o l n u m b e r so
matic diagram )
nff reference numbers refer to Figure I unLess
otherwise specified.
.
PreLiminary checks of the DC voltages present at various
points in your amplifier
can indicate
whether a transistor
is
oPen, shorted r or otherwise malfunctioning.
Fault isol-ation
in the preampfifier,
tone amplifier,
and driver stages ean
generaffy be isolated
by checking the DC voltages.
Many times
the circuit
defect can be isolated
by comparing gain measurements at lKHz as indicated on the schematic or by comparing
the operating channel with the defective
channe.l-.
A M P L I F I E RT L E C T R O N IRCE L A YP R O T E C T I OANN D S P E A K E 5
RY S T E MC H E I K 5 :
This amplifier
incorporates
a special
eLectronic over.load protection
which automatically
disconnects the speakers
circuit
when danger to the power amplifier
exists or when danger to
the speaker system exists.
If there is no output to the speakers,
check the speaker connections for shorted wires or shorted
(Sp"aker line resistances should not indicate
speakers.
less
t h a n 4 o h m r e s i s t a n c e o n a n o h m m e t e r .)
The Electronic
Re1ay Protection
of an eJ.ectronic
circuit
consists
switch which senses two eonditions,
output current and DC center
p o i n t v o L t a g e , t o p r o t e c t b o t h t h e p o w e r a m p l - i fi e r a n d t h e
This circuit
speakets.
the current delivered to the
limits
speaker load and also protects the speaker from DC vol-tages in
the event of an amplifier
device failure.
A center point DC
shift
is detected by dif f erential- ampl-ifier TR702 and TR703, which
disconnects the power amplifier
from the speaker J-oad by way of
transistors
TR704, TR705 and TR705, which deactivates a re1ay,
disccnnecting
the speaker load.
current
The power amplifier
protection
is obtained by transistors
TR701a and TR701b with
associated components, which sense the current through the output
transistor
resistors
R 5 2 4 a n d R 5 2 5 . V r l h e nt h e p e a k c u r r e n t s
reach approximately 5 Amps, TR70l-a and TR701b conduct, causing
mul-tivibrator
action in conjunction with TR704, TR705, and TR705
to deactivate the relay at a recurring
rate, thereby protecting
will
This circuit
the amplifier
from abnormal- load conditions.
sample and disconnect the spearkel line untiL the ovexcontinuely
load condition
is removed.
While servicing
be valuable to operate the
the ampl-ifier it will
a m p l i f i e r u s i n g a v a r i a b l - e v o . l - t a g e p o w e r I i n e ( V A R IA C) e q u i p p e d
with a line wattmeter to identify
abnormal power consumption.
I nerease the power line voltage upward while observing the
Power consumption should not exceed 10-2U watts
wattmeter.
( loudness control
v o l u m e a t m i n i m u m) . s t h e v o l t a g e i s i n c r e a s e d
Page 3
t o t h e r a t e d I 2 O V A C . I f t h e p o w e r c o n s u m p t i o nb e g i n s t o e x c e e d
2 0 w a t t s , d o N O Ti n c r e a s e t h e l i n e v o L t a g e a n y f u r t h e r a n d
d e t e x m i n e w h e t h e r t h e m a l f u n c t i o n i s i n t h e p o w e r s u P P f V' t u n e r ,
or amplifier section.
the center point
is suspected, verify
If the power amplifier
v o l t a g e a t t h e + s p e a k e r t e r m i n a l f o r a Z E R Ov o l t a g e + 0 . 2 V
If the center point vo.l-tage reads a plus voltage r
xeading.
(TR604) or a shortsuspect a shorted top side driver transistor
(TR508) (schematic shows
ed top side darLington output transistor
If the eenter
as the top devices in each channel).
transistors
point voltage reads minus, suspect a shorted bottom side driver
(TR505) or a shorted bottom side darlington output
transistor
( T R 5 0 9) .
transistor
be located by removing both driver
A defect can frequently
If Line power consumption drops
s
ockets.
f
r
o
m
t
h
e
i
r
transistors
I f p o w e l cc o n d
r
i
v
e
r transistots.
s
u
s
p
e
c
t
f
a
u
f
t
y
considerablyr
s
h
o
ul-d be suspectt
r
a
n
s
i
s
t
o
r
s
h
i
g
h
o
u
t
p
u
t
f
a
u
l
t
y
sumption remains
may be
c
o
m
p
o
n
e
n
t
s
p
r
e
d
r
i
v
e
r
C
I
r
a
s
s
o
c
i
a
t
e
d
If not the
ed.
defective.
exists,
then verif y that capacitors are not
I f the f aul-t sti1l
board contains no sol-der shorts, open resistorst
shorted, circuit
poor solder connections, or broken pads.
vol-tage reads zero voltage in accordance
If the center-point
with the above check, apply audio signal- to the channel or
which
Distortion
channel-s being tested and measure distortion.
ratings may be due to one of the following:
exceeds amplifier
are not beta matched.
0utput transistors
1.
0utput bias requires readi ustment.
2.
aIe not Ploviding adequate
Driver transistors
3.
signal drive.
a properly oper'ating amPlifier
performance indicates
The following
load.
with an I ohm resistive
Distortion at 2.0V:
Less than 0.15% IM or Harmonic (tKHz), Typically
O.O7/"
Distortion at 10V:
T y p i c a l l y A . 2 / o I M o r H a r m o n i c ( f f H z)
Page 4
Typically
52 lrlatts DuaI Channel at 0.8/o (ZOHz
Typically
50 tl/atts Singfe ChanneLat O.8/o
ZOKHz)
O U T P U T R A N SsIT O RB I A S :
Proper output transistor
operation and output bias adj ustment are
performance of the amplifiet.
most important to assure correct
Bias adj ustment is necessaxy if the output transistors
are neplaced, * or if any of the transisto:rs
in the driver
circuitry
r or
symptoms:
exhibits
one or more of the following
the ampLifier
l.
0verheating of the output transistors
under normal-operating conditions.
2.
Excessive Low leveL
Harmonic Distortion
at 2.O volts across
I ntermoduLation or
more than B.15%
I ohms.
*It
washers used
is extremely important that the mica insulating
heat sinks be unfrom their
to seperate the output transistors
properly with siLicon grease liberafly
broken and installed
Make certain
applied to aLJ- surfaces in contact with each other.
do not contact
the emitter and base pins of the output transistors
any part of the heat sinks.
SUGGESTED
AMPLIFIER
TEST BENCHSET.UP
SCOPE
AUDIO
D.C.
VOLTMETER
osc.
orc. fz<l
?u'.iJ it
+Probe
60db ATTENUATOR
lO db Steps
SWITCH
60 Hz
PHASEADJ.
TO OUTPUT
TERMINALS+
RECEIVERAC O - 3OOWotts
RECPTS.
WATTMETER
POSITIONJEST
TO INPUT
JACKS
6.3 VAC
[5 - r25VAC
t20v
T Hz
I . H . D . M E A S U R E M E N60
2 . I . M .M E A S U R E M E N T
3 . S I N E W A V EM E A S .
VARIAC
O-,5O lblts
Fig ure Z
Page 5
STORTION
O U T P U TA N D B I A S A D J U S T M E NUTS I N GA N I N T E R M O D U L A T IDOI N
A N A L Y ZRE
for
similar
testing
to Figure 2.
I.
Connect the amplifier
2.
Connect an Intermodulation Distortion Analyzer with a
r a t i o o f 4 : 1 u s i n g 6 O H z a n d 7 0 0 0 H 2t o t h e a m p L i f i e r ( A U X )
input and set the selector switch to AUX.
3.
S e t t h e v o l u m e c o n t r o l t o m a x i m u ma n d a d j u s t t h e g e n e r a t o r
f o r a n a m p l , i fi e r o u t p u t o f 2 . O v o l t s a c r o s s B o h m s .
4.
w a v e fo r m , a d j u s t
lrJhile observing the resultant distortion
(
t
h
e
crossover
VR501) so that
the bias potentiometer
(Class ttAgtt)
p
o
i
n
t
of being eliminated.
distortion
is at a
N o t e : C l a s s t r A t ro p e r a t i o n ( c o n t i n u e d C l r rrlo t a t i o n ) c a u s e s
output transistors to draw excessive current and overheat.
R T F ER T O D I A GR A M SB E L O ! i l
5.
lmproper Bios
Proper Bios
Ad iustmeni
Adiustment
Repeat Steps 3 and 4 for
oPPosit
channel.
performance indicates
The following
with an B ohm load.
amplifier
a pxoperly
operating
at 2.OV
Less than 0.15% I M Distortion
at 10V
O.2% IM Distortion
Typically
5O Watts of power per channel- at O.8%, single channel
50 h/atts of power per channel at O.8%, Dual channel
Distortion
Analyzer is not available r dF
I f an I ntermodulation
Analyzer may be used for
and a Harmonie Distorticln
0scillator
bias as foLIows:
adj ustment of the output transistor
P a ge 5
amplifier
l.
Connect the
2.
Connect an OsciLlator
IKHz to the amplifier
switch to AUX.
for
testing
similar
to
Figure
2,
at
with less than .O5/" distortion
( n U X) i n p u t a n d s e t t h e s e l e c t o r
3.
5et
for
4.
Using the Harmonic Distortion
Analyzer looking at the
distortion
make
of the amplifier
outputr properly
nulled,
the adjustment as fol-Lows:
Adjust the bias for Class frABrl
( V R 5 0 1) s o t h a t
operation by turning
the bias potentiometer
the cxossover is at a point of being eliminated.
the volume control
to maximum and adj ust the Oscillator
an amplifier
output of 2.O volts
across I ohms.
N o t e : C I a s s r r A r ro p e r a t i o n ( c o n t i n u e d C h ' r, o t a t i o n ) c a u s e s
the output transistors to draw excessive current and overheat.
SE L O h I
R E F E RT O D I A G R A M B
lmproper Bios
A d i u s fm e n t
5.
Repeat Steps
3 and 4 for
Proper Bios
Adiustmenl
the
opposite
channel.
performance indicates
a properly
The following
@
w
i
t
h
amplifier
an I ohm load
lKHz.
operating
Less than 0.10% THDat 2.0V
Typically 0.15% THD at 10V
60 Watts of pobrerper channel at O,!yo, single channel
5 0 l d a t t s o f p o w er p e r c h a n n e l a t o . 8 % , Z O H z - 2 0 r 0 0 0 H 2 ,
Dual channel
B i a s c a n a l s o b e a d j u s t e d b y u s i n g a V A R IA C e q u i p p e d w i t h
li ne wattmeter:
a
1.
Turn the
2.
A d j u st t h e b i a s p o t e n t i o m e t e r ( V R 5 0 1 ) , t o t h e p o i n t a t w h i c h
the amplifier begins to cause a vexy slight increase in line
wattage consumption.
loudness
controJ- to
minimum.
P R O T E C TOI N B O A R DT E S T IN G A N D A D J U S T M E N T :
Without
1.
audio drive.
of TR702
Adj ust VR701 for equal voLtage on the coLIectors
b
a
l
a
nced so
n
o
w
a
m
p
l
i
f
i
e
r
i
s
and TR703. The differential
sPeaker
t
h
e
+
D
C
a
t
p
r
o
t
e
.
c
t
v
o
l
t
a
g
e
against
as to properly
te rminals .
Page 7
2.
Short the speaker terminals
channel speaker outputs.
3.
C o nn e c t a n a u d i o
AUX inp uts ,
4.
Now, test the protection
board for proper openation by
increasing
the audio drive leveJ- to the powex amplifiet.
disconnectThis wilJ- cause the relay to be deactivated,
at a recurring
from the amplifier
ing the speaker terminals
This should occur at less than 100 watts of 1ine
rate.
Do not audio drive into a short circuit,
input power.
buyond this input power 1eveL.
oscill-ator
on both
the
o p ex a t i n g
at
Left
and right
lKHz to
both
F O U R C H A N N T LO P E R A T I O N
This
circuit.
The 5-9400 incorporates
a 4-channel matrixing
which
simple matrixing
all,ows recorded ambient signals,
circuit
are not reproduced during
conventionaL stereo playback, to be
amplifing equipconverted to 4-channeL sound without additional
By connecting 2 additional- speaker systems, one each to the
ment.
rear
they then become the left
R E M 0 T EL e f t a n d R i g h t t e r m i n a l s ,
rear sound soulces with the front panel toggfe switch
and right
in the Dynaquad I N position.
the speakers
hlhen the toggle switch is in the rrupil position
c o n n e c t e d t o t h e R E M O T Et e r m i n a l s c a n b e u t i l - i z e d a s a s e c o n d
set of stereo sound sources in the same area or at a remote
J-ocation.
Page I
S - 9 4 0 0 P A R T sL I s T
P A R TD E S E R I P T I O N
S C H E M A T IR
CE F E R E N CNEO .
P A R TN O .
TR501ar501b
T R 5 0 5 a 5, 0 5 b
T R 5 0 1a , 5 O 1 b 5
, O 2 a ,5 O 2 b
TR901
a r 9 O 1 br 9 1 2 a , 6 O Z b
TR704r705
T R 5 0 3 a 5, 0 3 b ,6 0 4 a , 5 O 4 b
T R 5 0 3 a 5, 0 3 b
TR801
T R 6 0 8a , 5 0 8 b ,5 0 9 a , 5 O 9 b
T R 5 0 2 a r5 D 2 b
TR 7 0 5
TR7U1
a , 7 0 1 b 1 7 0 2r 7 O 3 ,
802
30 20 0 7 8 0
300000
11
30 0 00241
30200124
3020u521
3U2U0371
3 0 2 0 0 701
3020 0421
3U300143
30400041
3U200531
3 0 2 0 u5 9 0
D 7 0 1a , 7 0 1 b1 7 0 2r 7 O 3r 7 O 4
D 5 0 1a , 5 0 1b
D501ar501b
D g 0 1, g o 2 , 8 0 3 , 8 0 4
D 6 O 4 a 5, O 4 br 7 0 5 , 8 0 5 , 8 0 5 '
851
D 80 7
30500260
30500410
80
306U01
30500450
LIST*
PRICE
T R A N IS5 T O R 5
2N5087
2sA505L
2 5 A6 4 0
2 s c5 9 3 F
25C945P
2sc959L
2 5 C 10 0 0
2 5 C 1 211D
2 5 0 3 23 K
25K34
cDE8002C
5 P 55 4 5 6
.90
2.go
.78
.98
.50
2. 1 0
-72
1. 1 7
4.44
1.26
1.50
.30
DI O D E S
30500u3u
.30
.22
.48
.38
.55
30500370
.90
C 5 0 1 a r 5 0 b1 , 9 O 1a , 9 0 1b ,
g O Z b , 9 0 3ra9 0 3 b ,9 O 4 a ,
904b
C9D2a
C 5 0 3 a , 5 0 3 b , 5 0 4, 5a 0 4 b ,
5 0 5 a , 5 0 5 b, 5 O 7a , 5 0 7 b
c 8 10
C 5 0 8 a5
, 08b
C 5 0 4a , 5 0 4 b, 7 0 2
C 6 O 2 ra5 O 2 b
C606a,605b'854
C505a,505b
c 70 1
C 5 10 a r 5 10 b , 5 O l a r 5 0 7 b
c 8 0 1, 8 0 8 , 8 0 9
6 4 0 4 3 4 75
.48
5 4 11 3 4 75
6 4 0 4 2 10 6
.48
.48
c703
c 85 3
c B51 , 8 5 2
6 4 0 4 3 10 5
6 4 0 4 s 10 5
640403 3 5
54843335
5404s335
5 4 A 4 14 7 5
5 4 0 4 3 10 7
6 4 0 4 s 1U 7
54045221
5 4 D 4 13 3 7
5 4 2 4 5 10 8
54245478
.48
.55
.32
.48
.52
.35
.56
I .25
1.45
. B0
3.00
6.30
.47uf @ 35V
4.7uf @ 15V
C509a,509b
C5 U 1a , 5 0 1b
66054414
5 6 0 6 2 4 7s
.53
.85
V A R I A B L ER E S I 5 T O R 5
B I A s A D J U s T( 1 K )
VR501ar501b
2 8 1 0 0 0 1I
.85
15188
1 s247 3
5V-03
u-05c
v05c
wz-120
C A P A E I T O R SE L E C T R O L Y T I E
4.7uf @ 25U
4.7uf @ 25V (AXIAL)
10uf @ 15V
1O u f @ 2 5 V
1O u f @ 5 0 V
33uf @ 5.3V
33uf @ 25V
33uf @ 50V
41uf @ 10V
10 0 u f @ 2 5 U
10 0 u f @ 5 0 V
221uf @ 50V
3 3 O u f @ 10 V
10 0 0 u f @ 5 3 V
4700uf @ 50V
c A P A C I T 0 R ST, A N T A L U M
Page 9
P A R TD E S C R I P T I O N
S C H E M AC
T I R E F E R E N CNEO .
P A R TN O .
LIST*
PRICE
J A R T A B L ER E S I s T 0 R s( C 0 N T ).
(IT)
D I F F - A M PB A L A N C E
BALANCE
C 0 N T R 0 L( n U n l 1 0 0 K )
L 0 u D N E s sC 0 N T R O L
w/swITcH
( D U A L1 O O K )
T O N EC O N T R O L(sD U A L1 O O K
)
VR7O1
V R 5 5 a1 r 5 5 1b
VR552a,552b
2810004I
2820001
2 8 0 0 0 05 3
.50
2.24
4.40
V R 9 0 1a r 9 O 1 b ,9 O 2 ar 9 O 2 b
28000 040
2.go
5W2
SbJ9
5h/3r4r5r6rgr11
s!d7
5tif10
2730000s
27300005
2 75 0 0 0 12
27100040
2 71 0 D 0 4 4
27100051
3 7 0 0 8 061
3 7 0 0 8 091
3 0 7 0 0 001
38300030
1.44
1.26
1.95
2.34
2.34
4.O4
.53
.66
.12
.30
G E N E R AS
LECTION
S W I T C H , t 4 I C /P H 0 N 0 2
S W I T C ,H P R E - A M P0 U T I M A
I N - A M PI N
S W I T C H ,L T V E RT Y P E
S W I T C H ,M 0 D E
S W I T C H ,S P E A K E R
S W I T C H ,S E L E C T 0 R
L A M P ( 8 V - 0 . 1 A M P)
L A M P ( E V - O . 2 5 A M P)
T H E R M I S T ODR- 2 2 4
F U S E3 A
st|J1
P L 1, 2 1 3 r 4 r 5
P L 1r l
T H 5 0 a1 , 5 0 1 b
F1
M E C H A N I C ASLE E T I O N
MICROPHON
JA
EC K
H E A D P H O NAEN D T A P E D U B B
I N G J AC K
I N P U TB D . ( , | J A C K )
I N P U TB D . ( q J A C K)
I N P U TB D . ( E J A C K )
I N P U TB D . ( , | O J A C K )
D I N J A C K( S P I N )
L D. (A POST)
SPEAKET
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H
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FUNCTION
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P0
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TRANSIST0R
T H E R M I S T OHRO L D E R
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K N O B ,F L I P L E V E R
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s T Y R E F O AEMN D C A P s
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33020700
33 0 3 0 4 0 0
3 3 0 10 ' l0 0
33040500
33080300
3 3 10 0 3 0 0
34034001
53080200
34032001
3 40428D1
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8
34011002
53152001
29058001
29056001
2 910 70 0 2
2 9 10 6 0 s ?
1 0 0 91 0 0 1
85034002
74A14001
81100013
89048001
85083001
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1.58
2.50
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3.66
29.95
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1.20
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.86
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19.75
22.80
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'48
6.26
CIRCUITDIAGRAM
SHERWooD
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MAIN AMP IN
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CIRCUITDIAGRAM
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TAPE REC
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SW-I
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SW-3
SW-{
SW-5
sw-6
SW-?
SW.6
SW-g
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SW-ll
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INPUT SELECTORSW
PHONO-z/ltilCSELECTORSW
TAPE MONTORSW
FOUR CHANNELINPUT SW
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LOW FILTER SW
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HIGH F:ILTERSW
PRE-AMP MAIN-ArrtpSEPARATESW
sP SELECTORSW
DYNA QUADSW
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r2-15-?a-t-3-r:1
NOTES
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4 3 0 0 N 0 R T HC A L I F 0 R N I AA V E N U E C
478-7300