IT - CREAPROMEDIA Sauvegarde du Patrimoine · Symbol & Description Volume Assembly (GWG-1 30) Part No. Symbol & Description CEANL OR1 M 50 cEA 101P 16 cFA R47P 50 coMA 332K 50 CKDYF

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


2SA1075lAt-G2SC2525lAl-G

OTHERS

Part No.

01 , 0402, 03


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


SEMICONDUCTORS


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


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.


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.


eCAPACITORS


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)


AKN-023

Fuse Assembly (GWX-337)


Phone j ack (PHONESI

INote: When ordering resistors, conuert the

resistance value into code form, andRESfSTORS then rewrite the part no as before.


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


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)


ASK-160ASK-160

Muting Assembly

Part No.

S1S2

(GWS-192)


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)

Documents

IT - CREAPROMEDIA Sauvegarde du Patrimoine · Symbol & Description Volume Assembly (GWG-1 30) Part No. Symbol & Description CEANL OR1 M 50 cEA 101P 16 cFA R47P 50 coMA 332K 50 CKDYF