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IT
STEREO AM PLIF IER
sA-7cIa
(1)rrloNEER.
: . )(=*\
PIoNEEFI ELECTFIG'NIC CG'FIPG'FIATIGIN 4-1' Mesuro 1-chome' Mesuro-ku' Tokvo 153' Japan
Ij#lEi:=iËgft:lËËgilml*iç*gl;*'+;àÉ?"jâe.Ë#"È:'"Ër"r::ï::11ir1i".""",,"< AFfi-3É7O)
sA-7clE|
lndicator Assembly
CAPACITORS
Par t No,
(AWV-004)
Symbol & Descr ipt ion
Volume Assembly (GWG-1 30)
Part No. Symbol & Descr ipt ion
C E A N L O R 1 M 5 0c E A 1 0 1 P 1 6c F A R 4 7 P 5 0coMA 332K 50C K D Y F 4 7 3 2 5 0
N o t e :
RESISTORS
Part No.
C4C5 , C6c7-c9
When ordering resls/ors, cont,ert theresistance value inta code form, andthen rewrite the part no as before
Symbol & Descript ion
A C V - 1 8 1
RD%PM 1O4JR D % P M 1 2 3 JccDs l 271K50coMA 473J 50A S K - 1 5 8
V R 1 Variable resistor( V O L U M E }
R 1 1 1 , R 1 1 2R 1 1 3 , R 1 1 4c101 , c102c 1 0 3 , c 1 0 455 Leve r sw i t ch ( LOUDNESS)
RD%PMF Û t l n JRD%PM -I ] t ] JACP.O78
SEMICONDUCTORS
Part No. Symbol & Descr ipt ion
R 1R2-R4V R 1 . V R 2
TA7318P .AH 4 1 2 0 1 0
OTHERS
Part No.
o 102, 03
Symbol & Descr ipt ion
AAV.OO4I nrr-sru
V 1T 1
F l u o r e s c e n t i n d i c a t o r t u b e
H e a t e r t r a n s f o r m e r
1O. PACKI NGKey No. Part No. Description
12
A H A . 1 8 7ARB.328
AHD.698
Side pad
Operat ing instruct ions( E N G L I S H )Pack ing case
1 1. SUPPLEMENTS FOR HA TYPEModel SA'708/HA is the same as the SA-708/HR with exception of description in this supplements.Contrast of Miscellaneous Parts
/ .y'f ii,---,.<a2
Symbol DescriptionPart No.
RemarksHR type HA type
,A AC socke t (AC OUTLETS)Operat ing instruct ions( G E R M A N / F R E N C H )
AKP-026A R D . I 3 7
o This service manual is applicable to the HR and HA types. When repairing the S and S/G types,please see the additional service manual (ART-368).
CONTENTS t1 . SPEC|F |CATTONS
2. FRONT PANEL FACIL IT IES
3 . BLOCK D IAGRAM
4. C IRCUIT DESCRIPT IONS
4 . 1 P h o n o C i r c u i t . . . . .
4.2 Tone Controls . . .
4.3 Power Amplif ier . . .
4.4 Indicator Circuit
4.5 Protection Circuit
5. DISASSEMBLY . .
6 . PARTS LOCATION
7. ADJUSTMENTS.
8 . EXPLODED V IEW
9. SCHEMATIC DIAGRAM, P.C. BOARDPATTERNS AND PARTS LIST
34
6
6
6
6
7
8
I
1 0
1 2
1 3
LINE VOLTAGE SELECTION
HR type; Line voltage is factory adjusted at 24OY.HA type; Line voltage is factory adjusted at 220Y.Line voltage can be changed with following steps.1. Disconnect the power cord.2. Remove the top cover (refer to page 9).3. Reset the fuse (2.5A) on the Fuse assembly to
the comect place (see Fig. 1).4. Stick the line voltage label on the rear panel.
Part No. Description
9.1 Miscel lanea 15
9.2 Schematic Diagram 16
9.3 P.C. Board Connection Diagram 19
9.4 Parts List of P.C. Board Assemblies. . 23
1 0 . P A C K | N G . . . . 2 5
1 1 . S U P P L E M E N T S F O R H A T Y P E . 2 5
t
AAX.193AAX-192
22OV label
24OV label
MODEL SA.7O8 COMES IN FOUR VERSIONS DISTINGUISHED AS FOLLOWS:
Tvpe Voltage Remarks
H R 22OV and 240V (Selectable) U.K. and Oceania model
H A 22OV and 240V (Selectable) Êurope model
s 1 1OV, 12OV, 22OV,ond 240V (Switchablel General export model
S/G 1 1OV, 12OV, 22QV, and 240V (Switchablel U.S. Mi l i tary model
Fig. 1
1. SPECIFICATIONS
SemiconductorslCsFETs .TransistorsDiodes
Ampf ifier SectionCont inuous Power Output of G5 watts- perchannel , min. , at 8 ohms from 20 Hertz to20,000 Hertz wi th no more than 0.02 %total harmonic d istor t ion or 65 watts perchannel at 4 ohms from 20 Hertz to 20,000Hertz wi th no more than 0.03% totalharmonic d istor t ion.Cont inuous Power Output at l kHz (both channels dr iven)
T.H.D. 0.02y" ,8 ohms . . 70 wat ts oer channelToral Harmonic Disror t ion (2OHertz to 20,000Hertz,
8 ohms, f rom AUX)cont inuous rated power output . . No more than 0.02%32.5 wat ts per channel power output
. . . . No more than 0.02%'f watt per channel power output . No more thanO.O2o/o
In te rmodu la t i on D i s to r t i on (50 Her t z : 7 ,000 Her t z = 4 :1 ,8 ohms, f rom AUX)continuous rated power output . . No more than0.02o/o32.5 wat ts per channel power output
. . . . . No more thano.}2o/o1 watt per channel power output . No more thanO.O2o/o
Damping F actor(20 Hertz to 20,000 Hertz, 8 ohms) . 35
Input (Sensi t iv i ty / l mpedance)PHONO . . 2 .5mV/5Oki lohmsT U N E R . . l 5 0 m V / 5 O k i l o h m sA U X . . . 1 5 0 m V / 5 0 k i l o h m sT A P E P L A Y l , 2 . . . . . . . 1 5 0 m V / 5 0 k i l o h m sTAPE PLAY 2 (D lN connec to r ) . . . 150mV/50k i l ohms
Phono Over load Level (T.H.D. 0.01%, l kHz)PHoNo . " 2oomV
Output (Level / l mpedance)T A P E R E C l . . . , . 1 i ? m Y l 1 k i l o h mT A P E R E C 2 . . . . . . . . . : . l s 0 m V / l k i l o h mTAPE REC 2 (DlN connector) 3OmV/8Oki lohms
Speaker . A, B, A+B (4 - 16ohms)
Frequency ResponsePHONO (R IAA Equa l i za t i on )
20Hz to 20,000H2 j0.2dB
T U N E R , A U X . T A P E P L A Y
J
24 13 1
sA-7ClEt
Tone Contro lB A S S . . . . + 7 . 5 d 8 , - 7 . 5 d 8 ( t 0 0 H z )TREBLE +7 .5d8 , -7 .5d8 (10 ,000H2)
Subsonic F i l ter . l5Hz ( -6dB/oct)Loudness Contour (Volume contro l set at -40d8
p o s i t i o n ) . . . . + 6 d B ( 1 0 0 H 2 ) , + 3 d B ( 1 0 , 0 0 0 H 2 )Hum and Noise ( lHF, shor t -c i rcu i ted, A network)
P H O N O . . . . 8 6 d 8TUNER, AUX, TAPE PLAY. . IOOdB
Hum and Noise (DlN cont inuous power/5OmW)PHONO TodB/6odBTUNER, AUX, TAPE PLAY . 86dB /61d8
Muting -20d8
Miscel laneous
Power RequirementsH A m o d e l . . 2 2 0 V , 5 0 / 6 0 H 2H R m o d e l . . . 2 4 0 V , 5 0 1 6 0 H 2S, SiG models 1 l0V/1 20V 1220v 1240V, 50/60H2
Power Consumot ionH A , H R m o d e l s . . . . 6 0 0 WS, S/G models l90W
D i m e n s i o n s . . . . 4 2 0 ( W ) x 1 5 0 ( H ) x 3 3 7 ( D ) m m16-e l16 (w) x s -7 l8 (H) x t 3 -1 l4 (D) i n
Weight (wi thout package) . . . . 9 .7kg (21 tb. 6 oz)
Furnished Parts
Operat ing inst ruct ions 1Fuse 2.5A (S, S/G models only) 1Fuse 5A (S, S/G models only) . I
NOTE:Specifications and the design subject to possible modifi-cations without notice due to improuements.
* Measured pursuant to the Federanl Trade Commision'sTrade Regulation rule on Power Output Claims forAmplifiers.
10Hz to 50 .000H2 l . l dB
3. BLOCK DIAGRAM
1 U N E R
aux
rRECTAPE I
L pllv
r R E CTAPE 2
Lpr-lY
TAPE OUPLICATE
f275dBil ( f : 1 rHz , I
BALANCE I IMUTITIG voLutiEMODE I;I
[ ] exor , res
F L T U E E
S P E A K E R A
S P E A K E R B
S P E A K E R A
S P E A K E R 8
I BF U N C T ' O N
PHOr{O
TUNER
A U X
l R E CTAPE I
LPLAY
l R E CT A P E 2
LP LAY
P O W E R A I ' P
I N O I C A T O R D R I V E , F U N C T I O N I I i I D I C A T O R
P O W E R A M P
A M P
T O N E A M P
F L H E A T E R
4. CIRCUIT DESCRIPTIONS4.1 PHONO CIRCUITRF Interference Filter
Since the phono input circuit is extremely sensi-tive, it is adversely affected by radio frequencyinterference. This interference is reduced by insert-ing a resistor in series with the phono input circuitby setting the PHONO INTERFERENCE FILTERswitch on the rear panel to the ON position.
Equalizer AmplifierThe equalizer amplifier is a B-stage direct-
coupled amplifier with emitter-to-emitter feed-back. An S-N ratio of SGdB (at 2.bmV input,IHF-A, PHONO INTERFERENCE FILTER switchOFF) has been achieved by using a ultra-low-noisePNP transistor (2SAST8) at the first stage, andreducing the signal source resistance and equalizerelement impedance.
The 2nd stage load has been reduced, a large
6
output voltage obtained, and the output impe-dance lowered by using an emitter follower at theoutput stage.
Metal film resistors having a tolerance of. llToand polypropylene film capacitors having a toler_ance of !2Vo are used on the NFB circuit to obtainan equalizer deviation of within r0.2dB over the2OHz to 2OOOOHz range. The maximum allowableinput of this circuit is 20OmV (at 7kHz, THDo.otTo).
4.2 TONE CONTROLSThe tone amplifier is a B-stage direct-coupled
amplifier with emitter-to-emitter feedback.
_ Tone control (BASS, TREBLE) is accomplishedby providing the tone amplifier NFB circuit with afrequency characteristic. The NFB circuit ischanged to a flat frequency characteristic whenthe TONE switch is in the OFF position.
R C H A N N E L ( S A M E A S L C H A N N E L )
R E C T I F I E R
R E C T I F I E R
VO LTAGEREGU LATOR
R E C T I F I E RV O L I A G E
RE G U LAÎOR
sA-7clE|
O BASS AND TREBLE CONTROLS
Use these controls to adjust the bass and the
treble. If you set the tone switch to ON and turn
the bass control to right from its center position'
Vo" *iff be able to ômphasize tlne sound in the
io*-Tr"q.r"ncy range' Conversely' turning the bass
"o"t-f
'to the left from the center position' you
will attenuate the sound'yor,
""n use the treble control to adjust the
sound in the high-frequency range'
@ TONE SWITCH
Set this switch to ON when adjqsting the bass and
tÀf" controls. When set to OFF' the tone con-
trol circuits are disengaged and frequency
,"rpot *" is flat' This function is convenient for
"tË"n"g phono cartridge and speaker tone
quality and listening room acoustlcs'
O BALANCE CONTROL
Use this control to balance the volume of the left
and right channels' First, however'-set the mode
,"f""to-t to MONO, and adjust so that the sound
appears to come from somewhere exactly be-
tween the two speakers' lf the so.un$ appears to
L"-foua"t on the right, it means that the volume
oi tfr" right chann"l it high"t' Turn the balance
control to the left and adjust'
éî.ru"tt"fv, if th; sound-appears to be Iouder on
the left, it means that tùô volume of the left
"iu"""f is higher' Therefore' turn the balance
control to the right and adigst' After adjusting'
iJutn the mode selector to ST'
@ SUBSONIC FILTER SWITCH
When this switch is set to Xhe LSHz position-'-the
subsonic titter wittr a cut-off frequency of 15Hz is
actuated. The subsonic filter serves to attenuate
îi"qr'r".r"i"t lower than 15Hz in a 6dB/oct slope'
It is therefore effective in suppressing ultra-low-
frequency ,toi'!- *f i"h is generated by record
*"ô *d other causes' You cannot actually hear
this noise Uut iils -a
factor in th-e generation of
intermodulation distortion and it may damage
your speak"' 'V't"-' Set this syitlh to the 15Hz'p..itl""
during'iecord play for the best effect'
@ MODE SELECTOR
Use this selector for selecting the performances'
ST: Set to this position for normal stereo re-
ProductionMONO: rnri*"'îii'and right channel signals and
'"P'od''""t them monoPhonicallY'
@ FIJNCTION SELECTORUse this selector to select the progtam source'
When set, the function indicator above the meter
p"""i ""it"sponding
to the position of the func'
tion selector will light uP'
iUNBn, Set here when listening to broadcasts
on a tuner connected to the TUNER jacks'
(The TUNER function indicator lights up')
PHONô: Set here when playing records on a
turntable connected to the PHONO jacks'
(The PHONO function indicator lights up')
AUX: Èet here when listening to a program source
which is connected to the AUX jacks'
(The AUX function indicator lights up';
@ TAPE DUPLICATE SWITCHUse this switch when employing two tape decks
to duplicate recorded tapes or edit tapes' This
switch is otherwise kept at the OFF position'
ltC: when playing back the tape on a deck con-
nected to thl TAPE 1 jacks and recording
(duplicating) on a deck connected to the
TAPE 2 jacks'
OFF: Set to this position when not duplicating'
it1, wr,"n ptaying back the tape on a deck con-
nected to th*e TAPE 2 jacks and recording
(duplicating) on a deck connected to the
TAPE l jacks'
@ TAPE MONITOR SWITCH
Use this to select the program source which is
being reProduced' ,1: Set here to monitor a recording or a tape
being ptayed back on a tape.deck which is
connected to the TAPE 1 jacks'
OFF: Set t'"'" *nàtt"ver you are not playing back
a tape or Àonitoring a recording (i'e' when
you have set the function selector to
i'ttOUO or TUNER' or AUX for an alter-
native Program source)'
2; Set here tl monitor a recording or a tape
Ueing ptayàd Lack ol3 !".p"'deck which is
connected to the TAPE 2 jacxs'
2. FRONT PANEL FACILITIES
E Po\ryER SwITcH
@ SPEAKER sELEcToRUse this selector to select the speaker systems.OFF: Sound not obtained from,pàJ"i.A: Sound obtained from spe'akers ïonnectea
Sound obtained from speakers connectedto the B speaker terminals.Sound obtained from speakers connectedto both A and B speakerierminas.------'
@ PowERMETERThis meter allows you to read out the ratedpower level on the fluorescent dispiay tube whenspeakers with a nominal i-puau""â oï g ohms areconnected to the amplifier's speaker terminals.
@ FIJNCTION INDICATORS
A+B:
to the A speaker terminals.
@ LOUDNESS SWITCH
@ VOLUME CONTROLUse this control t9 adjust the output tevel to thespeakers and headphones. Tum it clocku,ise toincrease the output tevel. No ;;""; iuitt U" heardif you set i t to ,,b',
@ MUTING SWITCH
@ HEADPHONE JACKPlug the headphones into this jack when youwant to Iisten through your stereo-fràaOphones.NOTE:t^3::!:r:i:r.rer setector to oFF when tistening ontv with
The TUNER, PHONO.light up in accordancefunction selector.
The function indicator wi| not go off when the tapemonitor switch is set to posit ion ,, î , , or ' , ' ,2J. '-""
AUX function indicatorswith the position of the
4 . 3 P O W E R A M P L I F I E RThe first stage is a differential amplifier formed
by twin transistor, while the load circuit forms acurrent mirror circuit. The current mirror servesto make this stage operate in push-pull mode,thereby eliminating the even numbered harmonics,and doubling the gain.
The predriver stage is a Darlington connection,while the load circuit forms a constant-currentsource, thereby obtaining a high voltage gain.
The povver stage is a Darlington connectionpure-complementar5r SEPP circuit, employing anhigh speed transistor. The high speed transistoris a kind of IC consisting of a number ofsmall transistor being connected in parallel via anemitter resistor. This provides excellent highfrequency characteristics comparable to those ofa small-signal transistor. Furthermore, becausethere is no time constant in the NFB circuit in thelow-frequency region, amplification is possibledown to DC (DC inputs will be cut off, however,by the input coupling capacitor of the poweramplifier.).
The circuit features described above provide anextremely wide power frequency range (65W +
65W, 20Hz to 2OkHz,THD O.O2%, 8s, ).
4 .4 INDICATOR CIRCUITThe SA-708 output power and function indi-
cators feature fluorescent indicator tube (FL tube).In this tube. thermionic emissions from the cath-ode are accelerated into the fluorescent substanceof the segmental anodes, resulting in the emissionof light. This tube is used to indicate numerals,letters, and other symbols.
t c ( T A 7 3 1 8 P ) t /2
s t G N a L l N
siA-7cl8
An outline of the FL tube drive circuit is shownin Fig. 4-1. The output circuit signal is applied topin no.6 (4) of the IC (TA7318P-A). The IC con-tains a detector circuit, compressor (40dB), andpeak hold circuit for both left and right channels.The dynamic range of the signal is thus contractedby 40dB to obtain a "peak held" DC voltage.
The output power indicator segments of the FLtube are driven by the HA12010 ICs (one for eachchannel) equipped with 12 pairs of differentialamplifiers. These amplifiers are biased at increasinglevels, so each amplifier will commence to operateseparately as the input level increases. And sincethese amplifiers apply the voltages to the outputpower indicator segments, each successive segmentwill light up in tum as the input level rises.
The function indicators are lit up as a result ofa voltage being applied to the corresponding func-tion indicator segment according to the selectedpositions of the FUNCTION switch.
4 .5 PROTECTION CIRCUITThe purpose of this circuit is to protect the
speakers and the power amplifier. The relay in theoutput circuit is automatically opened in any ofthe following cases;1. During the "transient operations" when the
pov/er supply is tumed on and off.2. Upon detection of an overload caused by a
short circuit in the load.3. Upon detection of a DC voltage in the output
caused by component failure or accident.
t c ( H A t 2 0 r o )
+ 1 5 V
F L T J O R E S C E N T I N O I C A T O R T U B E
Fig . 4 -1 Ind ica tor c i rcu i t
C O M P R E S S O R
1 4 0 d B )DE lECTOR
oFFS€r COM-P E N S A T O R
F U N C T I O N
F I L A M E N T
. The L marh found on some component parts indicates' the importance of the safety factor of the part' There-
fore, when replacing, be sure to use parts of identical
designation
Lever knobAAD.183 Knob
AAB-2O2
Lever knobAAD.183
Lever knobAAD-183
KnobAAB.2O3
Lever knobAAD-183
Lever switch (LOUDNESS)ASK.158
Variable resistorACV-181
(VOLUME}
Lever switch (MUTING)ASK.158
Lever switch (TAPE)ASK-160
Rotary switch (FUNCTION)ASD. I18
Lever switch (MODE)ASK-158
Lever switch (SUBSONIC)ASK-158
6. PARTS LOCATIONFront Panel View
AAB-204
Lever knobAAD.183
Leverknobf r OAAD 183
Knob IKnobAAB.2O4
Front View with Panel Removed
Fluorescent indicator tubeAAV.OO4
t;Rotary switch (SPEAKEASD-104
Lever switch (POWER)ASK.s15
Phone iack (PHONES)AKN.O23
Variable resistor (BASS, TREBLEACT- I17
Lever switch (TONEASK.158
Variable resistor (BALANCE)ACT-118
Muting Operation When Power Supply is TurnedOn and Off
With reference to Fig. 4-2 when the power sup-ply is turned on, Qz tums off due to +Br and +Bz.If there is no input (DC) on Qc and Qr, they willbe off, and the timing capacitor C, charges upthrough R3 and D3 and thus Qr tums on. \[henQ3 conducts, the relay operates, and the outputmuting on the power amplifier will be removed.
When the power supply is tumed off, +3, yillabruptly decay, and Q, will conduct owing to theresidual component of +Br . As a result, Cz willrapidly discharge, Qr will cease to conduct, where-upon the relay will become de-energized andrestore muting.
Overload DetectorThe overload detector circuit incorporates the
load (RL) in one side of a Wheatstone bridge (seeFig. 4-3). The base and emitter of a sensing transis-tor (Q, ) are connected to the opposite comers ofthe bridge, so if RL decreases, Qr will becomeforward biased. If RL falls below a prescribedvalue, Qr will turn on, thereby pasding a currentthrough R3 and Dr. Due to the voltage differencegenerated across R:, Q, will become forwardbiased, and consequently tum on. C, will rapidlydischarge. As consequence, Q3 will tum on and therelay will become de-energized, thus causing theoutput circuit to open.
DC Voltage DetectorThe output circuit is connected to the Q5 emit-
ter and Q+ base via a low-pass filter (Ro, C, ).Any DC voltages appearing at the output circuit ofthe power amplifier, will be applied to the e5emitter and the Qa base. If the voltage is negative,Q, turns on. Due to the voltage difference generar-ed across Rr, Q, will become forward biased, andconsequently turn on. C, will rapidly discharge.If the voltage is positive, Qc and e2 tums on. C,will rapidly discharge. As consequence, e3 wiùtum on and the relay will become de-energized,thus causing the output circuit to open.
@Overload detector
@Power OFF detector
Fis .4-2
@DC voltage detector
Protection circuit
Fig. 4-3 Overload detector
R E L A YD R I V E
l:t e jt Q 4
i ! 4 î
5. DISASSEMBLYTop Cover
Remove the two screws (A) on each side of thetop cover.
Bottom PlateRemove the seven screu/s (B) and the rivet (C)
to detach the bottom plate.
Front PanelRemove the all control knobs. Remove the four
nuts (D).
sA-7ClE|
\@tnt
Front panel
N
Top View
/r1 Fuse (2.5l j - \ AEK403
Tape terminal assemblYGWX-333
Control âssemblyGWG-129
sA-7clE|
Terminal assemblyGWX-334
AF assemblyGWK-130
Switch assemblyGWS-194
Muting assemblyGWS.192
Volume assemblyGWG-130
Terminal (SPEAKEBS)AKE.O38
Connector socketAKP-O24
Fuse assemblYGWX-337
SP switchGWX-335
Rear Panel View
Terminal ( INPUTAKB.O55
ASH-015
Terminal (TAPEAKB-054
Terminal (TAPE 2lAKB-054
rl
Slide switch--( P H O N O I N T E R F E R E N C E )
r l l
4 l
,,ô
Key No. Part No. Description
1 6 .A rz .
1 8 .1 9 .20.
Key No. Part No. Description
1. A8A-069A z. ATT-603A s. AEK-4o3
4. GWX-3375.
6.7. ABA-0258.9. AEC-446
10. A8A-069
1 1 .'12. ABA-04813. AWV-Oo414. GWX-33615. GWG-I29
Screw 4xBPower transformerFuse (2 .54 )
Fuse assemblYWire saddle
P.C. Board holder
Screw 3x4FrameFoot assemblY
Screw 4xB
AngleScrew 3x6Indicator assemblYHeadphone assemblY
Control assemblY
25. AEC-488
26. 2SC2525lAl-G27. 2SA1075lAl-G28. ABA-20829.30. GWK-I30
31. GWG-13032. GWS-I9433.34.
A ss. AKP-oog
36. AKE-03837. GWX-33438. GWX-33339. ABA-22840. ABA-057
41. ABA-1 574 2 . A B A - 1 1 543. ABA-1 1644. ABE-00545.
Insulator spacer
TransistorTransistorScrew 3x 1 2FrameAF assembly
Volume assembly
Switch assemblyFrameRear panel
Recessed plus (AC INLET)
Terminal (SPEAKE RS)
Terminal assemblYTape terminal assembly
Screw 3x6
Screw 3x8
Screw 3x8
Screw 3x10Screw 3x6WasherTe rm ina l (GND)
21. ABN-05022. ABN-04923. ABN-O3l24.
Lever swi tch (POWER)
CushionSP switch assemblyPanel stay
Union nutUn ion nu tNu t M7Heat s ink
ASK.51 5
GWX.335
siA-7cla
8. EXPLODED VIEW
NOTE:o Parts without part number cannot be supplied'
o The A marh found on some component parts indicotes the importance of the
safety factor of the pdrt Therefore, when replacing' be sure to use parts of
ide n t ical designa lion -
Key No. Part No. Description Key No. Part No. Description
1. ABA-0792. ANE-235
3. ANB-7474. M4$0865. 871-O04
Screw 4x8
Top cover
Front Panel assemblyWasherNut M9
Lever knob
7. AAB-2048. AAB-2029. AAB-203
1 0 .
11 . ABA-04812. AEC-525
13. 822-017
KnobKnobKnobBottom Plate
Screw 3x6Rivet
WasherAAD.183
7. ADJUSTMENTSld le Cu rrent Adjustment1. Tum the VOLUME control down to minimum
level, turn the power on, and wait about 10minutes.
2. Connect a DC voltmeter to the TP terminals(L ch; TP4 O and TP3 O, R ch; TPl @ andTPz o) of the cWK-130.
3. Check that the voltage between Tp4 and Tp3(L ch) lies within the DV DC 4mV- b0mVrange. Then make a similar check for the R ch(between TP3 and TP4). If the voltage is lessthan 4.4mV, cut jumper A (L ch), and jumperB (R ch). If the voltage exceeds bOmV. checkfor circuit failure-
I
I
Output Indicator Adjustment
4. Adjust the VOLUME control so that the volt-199 on_the output terminals (SPEAKERS) readev (AC).
Fis.7.1
5. Adjust VRl (L ch) and VR2indicator assembly so that theindicator read 10 watts.
(R ch) of theoutput power
B
Indicator assembly
@-vR,S-vn,
Panel stay
Fig. t.Z
10
SP SWITCH Ass'y (GWX-335) J_HEAD PHONE Ass,y(GWX-336)
o
iAss'y (cWX-337)i- I
I
l s , , P o w E R
I
20V /240V50 / 6OHz
NDICATOR Ass'y (AWV-004)
12
4
3
- J iîr ' : i : ' - I
J
a
gscHEMAT|cD|AGRAMS'P.c.BoARDPATTERNSAND PARTS LIST
NOTES;o W h e n o r d e r i n g r e s i s t - o r s , f i r s t c o n u e r t r e s i s t a n c e U a l u e s i n t o c o d e f o r m o s s h o u l n t n
the fol lowing exam2tes
Ex. t When there are 2 t Lrt from 0)' such as 560 ohm
and 47h ohm (tole i, ir itââlttt^ttri unlr:tt ) ' / 'PSAaaro 5e oRs
'/2H OBtrl i(
I s ) O I O ; 1 P O E O K
Ex 2 When there are 3 ich precision metal film resrc-
to rs ) . i l . . ,n t .Ae t RNt / tsR E)Gt r t r rs a i n s 5 6 2 x 1 o ' 5 6 2 1
o The A marh found on some component parts mdicates the importance of the
safetv factor tf ;; "'i"'ï
ii"it"'"' *in''- 'l"placing' be sure to use parts of
identical designatton
9 .1 MISCHELLANEA
qvmhnl & Descriptlon
Miscellanous Parts
CAPACITORS
Part No.
CKDYF 473250 c1-c4
SEMICONDUCTORS
List of Changed Parts for Factory Modification
L is t o f changed par ts in fo rmat ion w i l l be fu rn ished when-
ever necessary and you are reques ted to amend par ts
n u m b e r i n t h i s P a r t s l i s t '
Part No. Symbol & DescriPtion
25A1075/A/-G2SC2525lAl'G
OTHERS
Part No.
A arr-oosl\ ner-aosA nsr-st s
P.C. BOARD ASSEMBLIES
01, 0402, 03
Symbol & Description
Power t ransformer
Fuse (2 5A)Lever swi tch (POWER)
Description
T1F U 1s l 1
Part No.
GWK-130GWX-335GWX.336GWX.337GWX.334
GWX-333GWs-194GW$193GWS-192GWG-1 30
GWG-129AWV.OO4
AF assemblySP switch assembly
Headphone assemblY
Fuse assemblYTerminal assemblY
Tape terminal assemblY
Switch assemblYMode assemblY
Mut ing assemblY
Volume assembly
Control assemblYIndicator assemblY
9.2 SCHEMATIC DIAGRAM
NOTE:The indicated semiconductors are representatiue onesonly. Other alternatiue semiconductors may be used andare listed in the Parts list.
rt-----iI:]o., ,r"r^* o,,u
I Gwx -334
l l -
o50 l 5@2sc945A-Q ^
o509
fl
L.5
-1
I oaor -504
A A0 5 0 7 , 5 0 € r o E ?
rAP€ TERMINÀL À3! t
I cwx - 333I ÊFEc 6-
o{ r -404 rs20?6
Dal6 Mr-240
P O W E i S U P P L Y C I R C U I T
F o R E U R æ E M o É L
SA-7OE|
7
External Appearance ofTransistors and lCs
2SA733A2SC94sA
Type No
254798
Type No
TA7318P
HA12010
2SA9682SC223A2SD313
Type No
hre
2SA904A2SC1914A
S u f f r x -
258507
Type No
Type No hre
2586822sD712
:(
L o t N o
2SA949
2SA107slA/2SC2525lA/
2S49782SA1 1002SC19192s,C2575
t
d
-Type No
2SC1384t I / 4 q 5 \ t o r e r à n c ê ù n l e s s
( r ) | r 1 . { c ) ; : 2 i . ( x ) , I o r r o l e ! è n c e
c a p à c ! r y ( r F ) / v o l r a q e ( v ) ù n r € s s
t h ô u t v o l t a g e i s 5 0 v e x c e p t
v o l r à q e à t 6 5 î + 6 5 w 3 o ù È p ù È ( 1 k H 2 )
t â g é ( v ) a ! n ô i n p u r s i g h à I
r . r ) r s D c v o t r a g e à t l a t e d p o r e r
f o u b d o n s o m e c o m p o n e n t p a r è s
r n p o r t a n c e o f t h ê s a f e t y f à c t o !
T h e . e f ô ! e , u h e n r e p l à c i n 9 / b e
â r t s o f i d e n È r c è I d e s r q n a t i o n
i c s c h e n a È r c d i a g r a h , b u t È h e a c t ù à l
y C u ê t o r m p r o w e û ê n t s r n d c s r q h
: À T E r r 2 - S O U R C E - 2 , 1
o f F - - 2 0 d 8
STEREO-MONO
TUNER-PHONO.ÀUX
o r F - À - B - À + B
i n d i c a È e s t h e s e i t c h p o s i r i o n
hre
L o t N o
2SC1400
æc2æ1
Tvpê
I7
t d
9 SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNSAND PARTS LIST
NOlES:o When ordering resistors, first conuert resistance ualues into code form as shown in
the following examples.Ex 1 When there are 2 effective digits (any dieit apart from 0), such as 560 ohm
and 47h ohm (tolerance is shown by J = 57", and K: l0o/o).5 6 0 s t 5 6 x l o t 5 6 1 . . . . . . . R D I / I P S E 6 A J4 7 h a 47 x 103 473 . . RD%PS Ei lEBJ
- 0 .50 jRs RN2H @BE r
- J s ) o l o . . . . R S / P E I I I O K. Ex 2 When there are 3 effectiue digits (such as in high precision metal film resis'
tors).'
s . 6 2 k ç s 6 2 x t 0 ' s 6 2 1 , . R N Z a s - R E E E E F
. The A marh found on some component parts indicates the importance of the
safety factor of the part. Therefore, when replacing, be sure to use parts of
ide nt ical designation.
9.1 MISCHELLANEA
Miscellanous Parts
CAPACITORS
Part No. Symbol & Description
List of Changed Parts for Factory Modification
List of changed parts information wil l be furnished when-ever necessary and you are requested to amend partsnumber in th is par ts l i s t .CKDYF 473250 C1-C4
SEMICONDUCTORS
Part No. Symbol & Description
2SA1075lAt-G2SC2525lAl-G
OTHERS
Part No.
01 , 0402, 03
Symbol & Description
I err-eoaA eex-qosA nsr-sr s
T1F U lsl 1
Power transformerFuse {2.5A)Lever switch (POWER)
P.C. BOARD ASSEMBLIES
Part No. Description
GWK-130GWX.335GWX.336GWX.337GWX.334
GWX-333GWS-I94GWS-r93GWS-I92GWG-130
GWG-129AWV.OO4
AF assembly
SP switch assembly
Headphone assemblyFuse assemblyTerminal assembly
Tape terminal assemblySwitch assemblyMode assemblyMuting assemblyVolume assembly
Control assemblyIndicator assemblY
1210
SP SWITCH Ass'y (GWX-3351
H
HEAD PHONE Ass'y(GWX-336)
S P E A K E R S
A B
iAss 'y (GWX-337)
NDICATOR Ass'y (AWV-004)
10 '12
TAPE TERMINAL Ass ' y ( cWX 333)
Rrcr 100(
MUTING Ass 'y
Fh"r-l.l- I
1 l.|.JL'-"
ffi1,.r" i""[H
t ï*if i*r
i t
CONTROL Ass 'y (GWS-129)
VOLUME Ass 'y (GWG 130)
T C U D N E S S
1 S
TERMINAL Ass 'y(GWX-334)
Ie2l
a
SWITCH Ass'y(GWS-1e4)
I
) l
I
I
I
6
S e ' t , ,
59'.
â.-+ï
liil
l+^- .qOWER Tr .
o @ @ _t l
l'n"c( / )É Ae. t , 2w-.'_-
. , @ o @l i
AF Ass 'y (cWK-130)
I
siA-7clEt
9.4 PARTS LIST OF P.C. BOARD ASSEMBLIES
AF Assembly (GWK-I30)
CAPACITORS
Part No. Symbol & Description
SEMICONDUCTORS
Part No. Symbol & Description
AA
ACH-212ACG-004ccDsl 050D 50ccDSL 270K 50ccDSL470K 50
ccDSL 680K 50ccDSL 221 K 500CKDYB 471 K 50coMA 473J 50coMA 473J 250ccDSL 100K 50
cosA 271J 50cosA 1 22G 50coPA 183G 50coPA 683G 50CEANL 3R3M 50
CEA R47P 50c E A 1 0 0 P 1 6cEA 100P 63c E A 1 0 1 P 1 6c E A 1 0 1 P 2 5
c E A 1 0 1 P 3 5cEA 331 P 63cEA 471 P 6cEA 102P 50
Note:
RESISTORS
Part No,
c503, c504c502, c505, c506c311,C312, C409, C410c413, C414c401, c402
c405, c406, c407, c408c41 5-C418c30s, c306, c319, c320c421, C322c411, C412c425, C426
c301, c302, c509, c510c31 5, C31 6c 3 1 3 , C 3 1 4c 3 1 7 , C 3 1 8c303, c304, c403, C404
2SAg782SC1 91 9(2SC1 400)2S49492SA798_c
25C22912SA726S25C2229
* 2SA968-Y or O* 2SC2238-Y or O
0301, 03020303, 0304
0305, 0306, 0409, 0410o401, 0402
0403, 0404o405, 04060407, 0408, 0415, 04164 4 1 1 , 4 4 1 2o 4 1 3 , o 4 1 4
0501, 05020503, o51 1
o504
0505. 0507, 0508
0506
o509
0 5 1 0
D401 - D404, D41 1 -D41 4
D405- D408
D409, D410D415, D505-D508
D41 6
D501 -D504D509
D51 0
D51 1 -D51 4D 5 1 5
Symbol & Description
I
* h fe o f o l 11 -O414 shou ld have t he same va lue
CEANLNP 4R7M 50 C321 , C322CEANL 470M 16 C307 , C308CEANL 470M 35 C325cEA 010P 50 C517c E A 2 R 2 P 3 5 C 5 1 1 . C 5 1 2
2SK3425D112( 2 5 D 3 1 3 )2S8682(2S8507 )
2SC945A(25C2515)
2SA733A( 2 S A 1 1 0 0 )
2SA904A
2SC1 384
1 52076I r b t 5 5 5 '1 S1 555
STV3H.Y
A roez(srBol -02)MZ-240lwz-2401
A snsnu-aM Z - 1 7 7
{ w z - 1 7 7 1MZ-150(wz-150)
A rszazrMZ440(wz-140)
OTHERS
Part No.
c419, C420c51 3c51 6c51 5c424
c323, C324c507, c508c309, c310, c514c423
When ordering resistors, conuert theresistance ualue into code form, andthen reutrite the part no. as before.
Symbol & Description
I
RD%PM tr t r t r J
RD%PM D lC J
RD%PM ! ! t r J
A nozpu rrr L
RN7"SO DO't ] FR S l P O C ! J
A Rozplv rrr .rRD%PS C lO J
A ncN-oso
RS2P t r lD J R515 , R516
: i_ Rozpsr r ra I R437, R43B
R303 -R316 , R325 -R334 . R337 .R401 -R404, R407-R41 8, F.423-R426R429-R436, R443-R446, R451 -R454
R503 -R51 0R 5 1 2 - R 5 1 4F.419-R422
R317-R322R323 ,R324 , R447 -R450 , R51 1R335 , R336R42 t .R428 . R501 , R502R439-R442
ASD. l 18ASR.O23
S9R L 1
Rota ry sw r t ch (FUNCTION)
Re lay
control AssemblY (GWG-I 29) SP Switch Assembly (GWX'335)
Note: When ordering resistors, conuert theresistance ualue into code form, andthen rewrite the part no. as before.
Part No. Symbol & DescriPtion
eCAPACITORS
Part No. Symbol & DescriPtion
ccDsL 100D 50ccDSL 270K 50CKDYB 681 K 50coMA 392J 50
coMA 223J 50coMA 104J 50cEA 100P 16oEA220P 25c E A 1 0 1 P 1 0
c E A 1 0 1 P 3 5CEANLNP OlOM 50CEANL 2R2M25CEANL 3R3M 25CEANL 3R3M 50
CEANL 4R7M 50
c205, C206c215, c216c211, c212c219.C220
c221, C222, C225, c226c227, C22Ac209, C210c233c207, C208
c231, c232c229, C230c217, C218c223, C224c201, C202
c213, C214
R601. R602R603. R604R605, R606SlO Rotary sw i tch (SPEAKERSI
RS2P trtrtr JRD%PM trtrtr JRSlP trtr trJASD-104
Headphone Assembly (GWX'336)
Part No. Symbol & Description
AKN-023
Fuse Assembly (GWX-337)
Part No. Symbol & DescriPtion
Phone j ack (PHONESI
INote: When ordering resistors, conuert the
resistance value into code form, andRESfSTORS then rewrite the part no as before.
Part No. Symbol & DescriPtion
I ncc-oor c501
Terminal Assembly (GWX-334)
Pert No. Symbol & Description
RD%PM lDtr J
RDTAVS CtrD JRSl P trtrtr J
A Rozpu nnr l
ACT-1 17ACT-1 18
SEMICONDUCTORS
Part No.
R201-R207, R213, R214, R219-R236,F.241-R243R208-R212. R215, R216, R239, R240R217. R218R237, R238
VR2, VR3 Var iab le (BASS, TREBLE)VR4 Var iab le (BALANCEI
Symbol & Description
RD%PM222JASH-O15
AKB-055
Tape Terminal
Part No.
R301 , R30258 Sl ide swi tch
( P H O N E I N T E R F E R E N C E }Te rm ina l ( INPUT)
Assembly (GWX-333)
Svmbol & Description
RD%PM 394JRD7.PM 1O4JAKB-O54AKP-024
R 1 0 1 , R 1 0 2Rl03, R104
Terminal {TAPEIConnector socket2S4978
2SC1 91 9(2SC140012SA949(2SA9051
SWITCH
Part No.
0201,42020203, 0204
0205, 0206
Symbol & Oescription
Switch Assembly (GWS-I 94)
Part No. SYmbol & Description
ASK-158
Mode Assembly (GWS-I 93)
Part No.
s6, s7 Lever (TONE, SUBSONIC)
Symbol & Description
ASK-160ASK-160
Muting Assembly
Part No.
S1S2
(GWS-192)
Symbol & Description
Lever swilch (DUPLICATEILever switch (TAPE MONITOR)
RDy.PM 332JASK-1 58
R 1 0 9 , R 1 1 054 Lever switch (MODEI
RD%PM 562JRD%PM 473JASK-158
R 1 0 7 . R 1 0 8R 1 0 5 , 8 1 0 653 Lever switch (MUTING)