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IT S T E R E OA M P L I F I E R sA-7cIa (1)rrloNEER. :.) (=*\ ELECTFIG'NIC CG'FIPG'FIATIGIN 153' Japan 4-1' Mesuro 1-chome' Mesuro-ku' Tokvo Ij#lEi:=iËgft:lËËgilml*iç*gl;*'+;àÉ?"jâe.Ë#"È PIoNEEFI < AFfi-3É7O) sA-7clE| lndicatorAssembly(AWV-004) VolumeAssembly(GWG-1 30) CAPACITORS Part No. Part No, Symbol & Description C E A N L O R 1M 5 0 c E A 1 0 1 P1 6 c F A R 4 7 P5 0 coMA 332K 50 C K D Y F4 7 3 2 5 0 C4 C5, C6 c7-c9 RESISTORS When ordering resls/ors,cont,ert the resistancevalue inta code form, and then rewrite the part no as before Part No. Symbol& Description N ote: RD%PMFÛtln J RD%PM -I]t] J ACP.O78 ACV-181 VR1 RD%PM 1O4J R D % P M1 2 3 J ccDsl 271K50 coMA 473J 50 ASK-158 R 11 1 ,R 1 1 2 R113,R114 c101, c102 c103,c104 55 L e v e rs w i t c h ( L O U D N E S S ) R1 R2-R4 VR1.VR2 V a r i a b l er e s i s t o r (VOLUME} ,.<a2 / SEMICONDUCTORS Part No. Symbol & Description .y'f ii,--- Symbol & Description o1 02, 03 TA7318P.A H412010 OTHERS Part No. Symbol & Description AAV.OO4 V1 T1 I nrr-sru Fluorescent indicator tube Heater transformer 1O. PACKING Key No. 1 2 Part No. Description AHA.187 ARB.328 Side pad O p e r a t i n gi n s t r u c t i o n s ( E N GL I S H ) P a c k i n gc a s e AHD.698 1 1. SUPPLEMENTSFOR HA TYPE Model SA'708/HA is the sameas the SA-708/HR with exception of descriptionin this supplements. Contrast of MiscellaneousParts Part No. Symbol Description HR type ,A A C s o c k e t( A C O U T L E T S ) O p e r a t i n gi n s t r u c t i o n s ( GE R M A N / F R E N C H ) HA type AKP-026 ARD.I37 Remarks MODELSA.7O8COMESIN FOURVERSIONSDISTINGUISHED AS FOLLOWS: Tvpe Remarks Voltage HR 22OV and 240V (Selectable) U . K . a n d O c e a n i am o d e l HA 22OV and 240V (Selectable) Êurope model s 11 O V , 1 2 O V , 2 2 O V , o n d 2 4 0 V ( S w i t c h a b l e l G e n e r a le x p o r t m o d e l S/G 11 O V , 1 2 O V , 2 2 Q V , a n d 2 4 0 V ( S w i t c h a b l e l U.S. Military model o This servicemanualis applicableto the HR and HA types.Whenrepairingthe S and S/G types, pleaseseethe additionalservicemanual(ART-368). CONTENTS 1. SPEC|F|CATTONS 2 . F R O N TP A N E LF A C I L I T I E S 3 . B L O C KD I A G R A M 3 4 6 4 . C I R C U I TD E S C R I P T I O N S 10 12 13 6 . P A R T SL O C A T I O N 7. ADJUSTMENTS. 8. EXPLODED VIEW 9 . S C H E M A T I CD I A G R A M ,P . C .B O A R D P A T T E R N SA N D P A R T SL I S T 4.1 PhonoCircuit..... 6 4.2 Tone Controls . . . 6 9.1 Miscellanea 4.3 PowerAmplifier . . . 6 9.2 SchematicDiagram 16 19 23 4.4 IndicatorCircuit 7 9.3 P.C.BoardConnectionDiagram 4.5 ProtectionCircuit 8 9.4 PartsList of P.C.BoardAssemblies. . 5 . D I S A S S E M B L Y. . I 15 10.PACK|NG.... 25 11.SUPPLEMENTSFORHATYPE. 25 t 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 changedwith following steps. 1. Disconnectthe power cord. 2. Remove the top cover (refer to page 9). 3. Reset the fuse (2.5A) on the Fuse assemblyto the comect place (seeFig. 1). 4. Stick the line voltage label on the rear panel. Part No. AAX.193 AAX-192 t Description 22OV label 24OV label F i g .1 sA-7ClEt 1. SPECIFICATIONS Semiconductors lCs FETs . Transistors Diodes J 2 41 31 Ampfifier Section C o n t i n u oPuosw eO r u t p uot f G 5 w a t t s -p e r c h a n n em l , i n . ,a t 8 o h m sf r o m2 0 H e r t zt o 2 0 , 0 0H 0 e r t z w i t hn om o r e t h a n 0 . 0 2% t o t a lh a r m o ndi ics t o r t i o n r 6 5 w a t t sp e r c h a n naetl 4 o h m sf r o m2 0 H e r ttzo 2 0 , 0 0 0 H e r tw z i t hn o m o r et h a n 0 . 0 3 % t o t a l h a r m o ndi ci s t o r t i o n . C o n t i n u o u sP o w e rO u t p u t a t l k H z ( b o t hc h a n n e lds r i v e n ) T . H . D .0 . 0 2 y " , 8o h m s . . 7 0 w a t t so e r c h a n n e l T o r a l H a r m o n i cD i s r o r t i o n( 2 O H e r t zt o 2 0 , 0 0 0 H e r t z , 8 o h m s ,f r o m A U X ) c o n t i n u o u rsa t e dp o w e ro u t p u t . . N o m o r et h a n0 . 0 2 % 3 2 . 5w a t t sp e rc h a n n epl o w e ro u t p u t . . . . N o m o r et h a n0 . 0 2 % 'f watt per channelpoweroutput . No more thanO.O2o/o I n t e r m o d u l a t i oDni s t o r t i o n( 5 0 H e r t z :7 , 0 0 0 H e r t z= 4 : 1 , 8 o h m s ,f r o m A U X ) continuousratedpoweroutput . . No more than0.02o/o 3 2 . 5w a t t sp e rc h a n n epl o w e ro u t p u t . . . . . No more thano.}2o/o 1 watt per channelpoweroutput . No more thanO.O2o/o DampingF actor (20 Hertzto 20,000Hertz,8 ohms) . 35 I n p u t ( S e n s i t itvyi / l m p e d a n c e ) . . 2.5mV/5Okilohms PHONO . .l50mV/5Okilohms TUNER ..150mV/50kilohms AUX. .....150mV/50kilohms TAPEPLAYl,2 .. T A P EP L A Y 2 ( D l N c o n n e c t o r ). . . 1 5 0 m V / 5 0 k i l o h m s P h o n oO v e r l o a dL e v e l( T . H . D .0 . 0 1 % ,l k H z ) PHoNo . " 2oomV l pedance) O u t p u t ( L e v e l /m .1i?mYl1kilohm TAPERECl..., . ls0mV/lkilohm : T A P E R E C 2. . . . . . . . . 3OmV/8Okilohms T A P E R E C2 ( D l N c o n n e c t o r ) . A, B, A+B (4 - 16ohms) Speaker FrequencyResponse P H O N O( R I A A E q u a l i z a t i o n ) 2 0 H zt o 2 0 , 0 0 0 H 2j 0 . 2 d B TUNERA , U X .T A P EP L A Y 1 0 H zt o 5 0 . 0 0 0 H 2 l . l d B T o n eC o n t r o l BASS. ... +7.5d8,-7.5d8(t00Hz) TREBLE + 7 . 5 d 8 -, 7 . 5 d 8 ( 1 0 , 0 0 0 H 2 ) S u b s o n i cF i l t e r. l5Hz (-6dB/oct) L o u d n e sC s o n t o u r( V o l u m ec o n t r o ls e ta t - 4 0 d 8 position) . . . . + 6 d B( 1 0 0 H 2 ) , + 3 d B ( 1 0 , 0 0 0 H 2 H u m a n d N o i s e( l H F , s h o r t - c i r c u i t eAd ,n e t w o r k ) PHONO ....86d8 T U N E R ,A U X , T A P EP L A Y . . IOOdB H u m a n d N o i s e( D l N c o n t i n u o u p sower/5OmW) PHONO TodB/6odB T U N E R ,A U X , T A P EP L A Y . 86dB/61d8 Muting -20d8 Miscellaneous P o w e rR e q u i r e m e n t s HAmodel ..220V,50/60H2 HR model . ..240V,50160H2 S, SiG models 1 l0V/1 20V 1220v1240V,50/60H2 P o w e rC o n s u m o t i o n HA,HRmodels ....600W S,S/Gmodels l90W Dimensions . . . . 4 2 0 ( W ) x 1 5 0 ( H )x 3 3 7 ( D )m m 1 6 - e l 1 6 ( wx) s - 7 l 8 ( H )x t 3 - 1 l 4 ( D )i n W e i g h (t w i t h o u tp a c k a g e ) . . . . 9 . 7 k g( 2 1 t b . 6 o z ) Furnished Parts O p e r a t i n gi n s t r u c t i o n s F u s e2 . 5 A ( S ,S / G m o d e l so n l y ) F u s e5 A ( S ,S / G m o d e l so n l y ) . 1 1 I NOTE: Specificationsand the designsubject to possiblemodificationswithout notice due to improuements. * Measuredpursuant to the FederanlTrade Commision's Trade Regulation rule on Power Output Claims for Amplifiers. 3. BLOCK DIAGRAM MUTITIG f275dBi l ( f : 1 r H zI, BALANCE I I voLutiE MODE I;I S P E A K E RA SPEAKER B [] exor,res 1UNER FL TUEE aux TAPEOUPLICATE rREC TAPE I L pllv IB FUNCT'ON rREC TAPE2 Lpr-lY PHOr{O SPEAKER A R CHANNEL(SAME AS L CHANNEL) TUNER AUX lREC TAPEI LPLAY S P E A K E R8 R E C TFI I E R POWER AI'P RECTIFIER INOICATOR DRIVE, FUNCTION IIiIDICATOR POWER AMP lREC T A P E2 LP LAY V OL T A G E R E G UL A T O R R E C T IF I E R VO LIAGE RE G U LAÎOR AMP TONE AMP FL HEATER 4. CIRCUIT DESCRIPTIONS 4 . 1 P H O N OC I R C U I T RF InterferenceFilter Since the phono input circuit is extremely sensitive, it is adversely affected by radio frequency interference. This interference is reduced by inserting a resistor in serieswith the phono input circuit by setting the PHONO INTERFERENCE FILTER switch on the rear panel to the ON position. EqualizerAmplifier The equalizer amplifier is a B-stage directcoupled amplifier with emitter-to-emitter feedback. An S-N ratio of SGdB (at 2.bmV input, IHF-A, PHONO INTERFERENCE FILTER switch OFF) has been achieved by using a ultra-low-noise PNP transistor (2SAST8) at the first stage, and reducing the signal source resistance and equalizer element impedance. The 2nd stage load has been reduced, a large 6 output voltage obtained, and the output impedance lowered by using an emitter follower at the output stage. Metal film resistors having a tolerance of. llTo and polypropylene film capacitors having a toler_ ance of !2Vo are used on the NFB circuit to obtain an equalizer deviation of within r0.2dB over the 2OHz to 2OOOOHz range. The maximum allowable input of this circuit is 20OmV (at 7kHz, THD o.otTo). 4.2 TONE CONTROLS The tone amplifier is a B-stage direct-coupled amplifier with emitter-to-emitter feedback. Tone control (BASS, TREBLE) is accomplished _ by providing the tone amplifier NFB circuit with a frequency characteristic. The NFB circuit is changed to a flat frequency characteristic when the TONE switch is in the OFF position. sA-7clE| O BASS AND TREBLE CONTROLS and the Use these controls to adjust the bass ON and turn treble. If you set the tone switch to position' the bass control to right from its center ômphasize tlne sound in the Vo" *iff be able to range' Conversely'turning the bass io*-Tr"q.r"ncy 'to you the left from the center position' "o"t-f will attenuate the sound' the yor, use the treble control to adjust ""n sound in the high-frequency range' @ TONE SWITCH the bassand Set this switch to ON when adjqsting the tone contÀf" controls. When set to OFF' and frequency trol circuits are disengaged is convenient for ,"rpot *" is flat' This function phono cartridge and speaker tone "tË"n"g quality and listening room acoustlcs' O BALANCE CONTROL of the left Use this control to balancethe volume the mode however'-set and right channels' First, sound the that so adjust ,"f""to-t to MONO, and beexactly somewhere appears to come from to appears so.un$ the lf tween the two speakers' that the volume L"-foua"t on the right, it means the balance Turn high"t' it oi tfr" right chann"l adjust' control to the left and to be Iouder on éî.ru"tt"fv, if th; sound-appears volume of the left the left, it means that tùô the balance is higher' Therefore' turn After adjusting' "iu"""f control to the right and adigst' ST' iJutn the mode selectorto SWITCH @ SUBSONIC FILTER to Xhe LSHz position-'-the set is When this switch frequency of 15Hz is cut-off a wittr subsonictitter servesto attenuate actuated. The subsonic filter in a 6dB/oct slope' îi"qr'r".r"i"t lower than 15Hz suppressingultra-lowIt is therefore effective in generated by record frequency ,toi'!- *f i"h is -a You cannot actually hear *"ô *d other causes' factor in th-e generation of this noise Uut iils and it may damage intermodulation distortion syitlh to the 15Hz your speak"' 'V't"-' Set this 'p..itl"" best effect' during'iecord play for the @ MODE SELECTOR the performances' Use this selector for selecting normal stereo refor Set to this position ST: Production right channel signalsand MONO: rnri*"'îii'and '"P'od''""t them monoPhonicallY' @ FIJNCTION SELECTOR Use this selectorto selectthe progtam source' meter When set, the function indicator above the func' the of position the to p"""i ""it"sponding uP' light tion selector will broadcasts iUNBn, Set here when listening to jacks' TUNER the to connected on a tuner (The TUNER function indicator lights up') on a PHONô: Set here when playing records jacks' turntable connected to the PHONO (The PHONO function indicator lights up') program source AUX: Èet here when listening to a jacks' which is connected to the AUX up'; lights (The AUX function indicator SWITCH @ TAPEDUPLICATE tape decks Use this switch when employing two This tapes' edit or to duplicate recorded tapes position' OFF switch is otherwise kept at the on a deck conltC: when playing back the tape jacks and recording 1 nected to thl TAPE to the connected deck a (duplicating) on jacks' TAPE 2 duplicating' OFF: Set to this position when not a deck conon tape the back it1, wr,"n ptaying jacks recording and 2 TAPE th*e nected to to the connected deck a on (duplicating) TAPE l jacks' @ TAPE MONITOR SWITCH source which is Use this to select the program being reProduced' , or a tape Set here to monitor a recording 1: which is tape.deck being ptayed back on a jacks' 1 connected to the TAPE you are not playing back OFF: Set t'"'" *nàtt"ver (i'e' when a tape or Àonitoring a recording to selector function the you have set alteran for i'ttOUO or TUNER' or AUX source)' native Program or a tape Set here tl monitor a recording 2; which is Ueing ptayàd Lack ol3 !".p"'deck jacxs' connectedto the TAPE 2 2. FRONT PANEL FACILITIES E Po\ryER SwITcH @ LOUDNESSSWITCH @ SPEAKER sELEcToR Use this selector to select the speaker systems. OFF: Sound not obtained from,pàJ"i. A: Sound obtained from spe'akers ïonnectea to the A speakerterminals. Sound obtained from speakersconnected to the B speakerterminals. A+B: Sound obtained from speakers connected to both A and B speakerierminas.------' @ PowERMETER This meter allows you to read out the rated power level on the fluorescent dispiay tube when speakerswith a nominal i-puau""â oï g ohms are connected to the amplifier's speaker terminals. @ FIJNCTION INDICATORS The TUNER, PHONO. AUX function indicators light up in accordance with the position of the function selector. The function indicator wi| not go off when the tape monitor switch is set to position ,,î,, or',',2J.'-"" @ VOLUME CONTROL Usethis control t9 adjustthe output tevelto the speakersand headphones.Tum it clocku,iseto increasethe output tevel. No ;;""; iuitt U" heard if you setit to ,,b', @ MUTING SWITCH @ HEADPHONEJACK Plug the headphonesinto this jack when you want to Iistenthroughyour stereo-fràaOphones. NOTE: t^3::!:r:i:r.rer setector to oFF when tistening ontvwith siA-7cl8 4 . 3 P O W E RA M P L I F I E R The first stage is a differential amplifier formed by twin transistor, while the load circuit forms a current mirror circuit. The current mirror serves to 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-current source, thereby obtaining a high voltage gain. The povver stage is a Darlington connection pure-complementar5r SEPP circuit, employing an high speed transistor. The high speed transistor is a kind of IC consisting of a number of small transistor being connected in parallel via an emitter resistor. This provides excellent high frequency characteristics comparable to those of a small-signal transistor. Furthermore, because there is no time constant in the NFB circuit in the low-frequency region, amplification is possible down to DC (DC inputs will be cut off, however, by the input coupling capacitor of the power amplifier.). The circuit features described above provide an extremely wide power frequency range (65W + 65W, 20Hz to 2OkHz,THD O.O2%,8s, ). 4 . 4 I N D I C A T O RC I R C U I T The SA-708 output power and function indicators feature fluorescentindicator tube (FL tube). In this tube. thermionic emissions from the cathode are acceleratedinto the fluorescent substance of the segmentalanodes, resulting in the emission of light. This tube is used to indicate numerals, letters, and other symbols. t c ( T A 7 3 1 8P ) s t G Na L l N D El E C T O R An outline of the FL tube drive circuit is shown in Fig. 4-1. The output circuit signal is applied to pin no.6 (4) of the IC (TA7318P-A).The IC contains a detector circuit, compressor (40dB), and peak hold circuit for both left and right channels. The dynamic range of the signal is thus contracted by 40dB to obtain a "peak held" DC voltage. The output power indicator segmentsof the FL tube are driven by the HA12010 ICs (one for each channel) equipped with 12 pairs of differential amplifiers. These amplifiers are biasedat increasing levels, so each amplifier will commence to operate separately as the input level increases.And since these amplifiers apply the voltages to the output power indicator segments,each successivesegment will light up in tum as the input level rises. The function indicators are lit up as a result of a voltage being applied to the corresponding function indicator segment according to the selected positions of the FUNCTION switch. 4 . 5 P R O T E C T I O NC I R C U I T The purpose of this circuit is to protect the speakersand the power amplifier. The relay in the output circuit is automatically opened in any of the 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 causedby component failure or accident. t/2 COMPRESSOR 140 dB ) tc (HA t20ro) oFFS€r COMPENSATOR FLTJORESCENT +1 5 V FUNCT ION INOICATOR TU BE FILAM E N T Fig.4-1 I n d i c a t o rc i r c u i t 6. PARTS LOCATION . The L 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 identical designation Front PanelView Leverknob AAD.183 Knob AAB-2O2 Leverknob AAD.183 O Leverknobfr AAD183 Leverknob AAD-183 Knob AAB-204 Knob AAB.2O3 Leverknob AAD.183 Leverknob Knob AAD-183 AAB.2O4 Front View with PanelRemoved Leverswitch (LOUDNESS) ASK.158 Variableresistor( V O L U M E } ACV-181 indicatortube Fluorescent AAV.OO4 Rotaryswitch (SPEAKE ASD-104 t; Leverswitch (MUTING) ASK.158 Leverswitch (POWER) ASK.s15 Phoneiack (PHONES) AKN.O23 Variableresistor(BASS,TREBLE ACT-I17 Leverswitch (TONE ASK.158 Variableresistor(BALANCE) ACT-118 Leverswitch (TAPE) ASK-160 Rotary switch (FUNCTION) ASD.I18 Leverswitch (MODE) ASK-158 Leverswitch (SUBSONIC) ASK-158 I Muting Operation When Power Supply is Turned On and Off With reference to Fig. 4-2 when the power supply is turned on, Qz tums off due to +Br and +Bz. If there is no input (DC) on Qc and Qr, they will be off, and the timing capacitor C, charges up through R3 and D3 and thus Qr tums on. \[hen Q3 conducts, the relay operates, and the output muting on the power amplifier will be removed. When the power supply is tumed off, +3, yill abruptly decay, and Q, will conduct owing to the residual component of +Br . As a result, Cz will rapidly discharge,Qr will ceaseto conduct, whereupon the relay will become de-energized and restore muting. Overload Detector The overload detector circuit incorporates the load (RL) in one side of a Wheatstone bridge (see Fig. 4-3). The baseand emitter of a sensingtransistor (Q, ) are connected to the opposite comers of the bridge, so if RL decreases,Qr will become forward biased. If RL falls below a prescribed value, Qr will turn on, thereby pasdinga current through R3 and Dr. Due to the voltage difference generated across R:, Q, will become forward biased, and consequently tum on. C, will rapidly discharge.As consequence,Q3 will tum on and the relay will become de-energized, thus causing the output circuit to open. DC Voltage Detector The output circuit is connected to the Q5 emitter and Q+ base via a low-pass filter (Ro, C, ). Any DC voltages appearingat the output circuit of the power amplifier, will be applied to the e5 emitter and the Qa base. If the voltage is negative, Q, turns on. Due to the voltage difference generared across Rr, Q, will become forward biased, and consequently turn on. C, will rapidly discharge. If the voltage is positive, Qc and e2 tums on. C, will rapidly discharge. As consequence, e3 wiù tum on and the relay will become de-energized, thus causingthe output circuit to open. RELAY DRIVE l:t e j tQ4 i!4 î @Overloaddetector @PowerOFF detector @DC voltagedetector F i s . 4 - 2 Protectioncircuit Fig. 4-3 Overload detector sA-7ClE| 5. DISASSEMBLY Top Cover Removethe two screws(A) on eachside of the top cover. Bottom Plate Remove the seven screu/s(B) and the rivet (C) to detach the bottom plate. Front Panel Remove the all control knobs. Remove the four nuts (D). \@tnt Front panel N sA-7clE| Top View Tape terminal assemblY GWX-333 Terminalassembly GWX-334 AF assembly GWK-130 /r1Fuse(2.5 lj-\ AEK403 Switchassembly GWS-194 FuseassemblY GWX-337 SP switch GWX-335 rl Control âssembly GWG-129 Mutingassembly GWS.192 Volumeassembly GWG-130 Rear Panel View T e r m i n a l( I N P U T AKB.O55 T e r m i n a (l S P E A K E B S ) AKE.O38 Slide switch-( P H O N OI N T E R F E R E N C E ) ASH-015 Terminal(TAPE AKB-054 T e r m i n a l( T A P E2 l AKB-054 Connectorsocket AKP-O24 rll 4l ,,ô Key No. 1. A z. A s. 4. Part No. Description A8A-069 ATT-603 AEK-4o3 GWX-337 Screw 4xB Power transformer F u s e( 2 . 5 4 ) F u s ea s s e m b l Y Wire saddle 5. 6. 7. 8. 9. 10. 11. '12. 13. 14. 15. AEC-446 A8A-069 P.C. Board holder Screw 3x4 Frame Foot assemblY Screw 4xB ABA-048 AWV-Oo4 GWX-336 GWG-I29 Angle Screw 3x6 Indicator assemblY Headphone assemblY Control assemblY ABA-025 16. A rz. 18. 19. 20. 21. 22. 23. 24. ASK.515 GWX.335 ABN-050 ABN-049 ABN-O3l L e v e rs w i t c h ( P O W E R ) Cushion SP switch assembly Panel stay Union nut Union nut Nut M7 Heat sink Part No. Description 25. AEC-488 I n s u l a t o rs p a c e r 26. 27. 28. 29. 30. 2SC2525lAl-G 2SA1075lAl-G ABA-208 Transistor Transistor Screw 3x 12 Frame AF assembly Key No. GWK-I30 Volume assembly Switch assembly Frame Rearpanel R e c e s s e dp l u s ( A C I N L E T ) 31. 32. 33. 34. A ss. GWG-130 GWS-I94 36. 37. 38. 39. 40. AKE-038 GWX-334 GWX-333 ABA-228 ABA-057 T e r m i n a l ( S P E A K ER S ) Terminal assemblY Tape terminal assembly 41. 42. 43. 44. 45. ABA-157 ABA-115 ABA-116 ABE-005 Screw 3x8 Screw 3x10 Screw 3x6 Washer T e r m i n a l( G N D ) AKP-oog Screw 3x6 Screw 3x8 siA-7cla 8. EXPLODEDVIEW NOTE: o Partswithout part number cannot be supplied' o of the marh found on some component parts indicotes the importance The A parts of use to sure be replacing' when Therefore, safety factor of the pdrt ide n t ical designa lion - Part No. Description 1. 2. ABA-079 ANE-235 Screw 4x8 Top cover 3. ANB-747 4. 5. M4$086 871-O04 FrontPanelassembly Washer Key No. AAD.183 Nut M9 Lever knob Part No. Description 7. 8. 9. 10. AAB-204 AAB-202 AAB-203 Knob Knob Knob Bottom Plate 11. 12. ABA-048 AEC-525 Screw 3x6 Rivet 13. 822-017 Washer Key No. 7. ADJUSTMENTS I ld le Current Adjustment 1. Tum the VOLUME control down to minimum level, turn the power on, and wait about 10 minutes. 2. Connect a DC voltmeter to the TP terminals (L ch; TP4 O and TP3 O, R ch; TPl @ and TPz o) of the cWK-130. 3. Check that the voltage between Tp4 and Tp3 (L ch) lies within the DV DC 4mV- b0mV range. Then make a similar check for the R ch (between TP3 and TP4). If the voltage is less than 4.4mV, cut jumper A (L ch), and jumper B (R ch). If the voltage exceeds bOmV. check for circuit failure- I B Fis.7.1 Output Indicator Adjustment Indicatorassembly @-vR, S-vn, 4. Adjust the VOLUME control so that the volt199 on_the output terminals (SPEAKERS) read ev (AC). 5. Adjust VRl (L ch) and VR2 (R ch) of the indicator assembly so that the output power indicator read 10 watts. Panelstay Fig.t.Z 10 i- iAss'y (cWX-337) II l s,, PowER I 20V /240V 50/6OHz SPSWITCHAss'y(GWX-335) J_ HEAD PHONEAss,y (GWX-336) NDICATORAss'y(AWV-004) o 12 4 -Ji îr':i:'- I 3 J gscHEMAT|cD|AGRAMS'P.c.BoARDPATTERNS AND PARTS LIST NOTES; oWhenorderingresist-ors,firstconuertresistanceUaluesintocodeformosshoulntn the following exam2tes Lrtfrom 0)' such as 560 ohm t Ex.t When there are 2 ohm(tole and47h unlr:tt t^ttri o 5e Is) a i,iritââltt )'/'PSAaar '/2HOBtrl i( ; 1 PO E O K oRs OIO ich precision metal film resrcEx 2 When there are 3 tors). R N t / t s RE ) G t r t r r t 5. A 6 2e 1 5 i6l 2 .x. 1, not' s ains the importance of the mdicates parts some component o The A marh found on "'i"'ï sure to use parts of be *in''- 'l"placing' ii"it"'"' safetv factor tf ;; identical designatton 9.1 MISCHELLANEA MiscellanousParts List of ChangedPartsfor Factory Modification CAPACITORS Part No. CKDYF 473250 qvmhnl & Descriptlon c1-c4 SEMICONDUCTORS Part No. 25A1075/A/-G 2SC2525lAl'G Symbol & DescriPtion 01, 04 02, 03 OTHERS Part No. A arr-oos l\ ner-aos A nsr-sts Symbol & Description T1 FU1 sl 1 Powertransformer Fuse (2 5A) L e v e rs w i t c h ( P O W E R ) P.C.BOARD ASSEMBLIES Part No. Description GWK-130 GWX-335 GWX.336 GWX.337 GWX.334 AF assembly SP switch assembly H e a d p h o n ea s s e m b l Y F u s ea s s e m b l Y Terminal assemblY GWX-333 GWs-194 GW$193 GWS-192 GWG-130 Tape terminal assemblY Switch assemblY Mode assemblY Muting assemblY Volume assembly GWG-129 AWV.OO4 Control assemblY Indicator assemblY f u r n i s h e dw h e n L i s t o f c h a n g e dp a r t s i n f o r m a t i o n w i l l b e t o amend parts y o u r e q u e s t e d are e v e r n e c e s s a r ya n d n u m b e r i n t h i s P a r t sl i s t ' DIAGRAM 9.2 SCHEMATIC NOTE: The indicated semiconductorsare representatiueones only. Other alternatiuesemiconductorsmay be usedand are listed in the Partslist. fl r A P € T E R M I N À LÀ 3 ! t I I cwx- 333 ÊFEc 6- L.5 rt-----i I:]o., ,r"r^* o,,u I ll- Gwx-334 -1 I o a o r- 5 0 4 AA 0507,50€ roE? o50l 5@ 2sc945A-Q o509 POWEi FoR SUPPLY CIRCUIT EURæE MoÉL ^ o{r-404 rs20?6 Dal6 Mr-240 SA-7OE| 7 External Appearanceof Transistorsand lCs 2SA968 2SC223A 2SD313 Type No 2SA733A 2SC94sA hre Type No 258507 : ( 2SA904A 2SC1914A Suffrx- 254798 t Type No Lot No Type No hre Type No d 258682 2sD712 TA7318P -Type No 2SC1384 I/4q t (r) | 5\ r1. (r F)/volraqe voltage volràqe r. r foubd rs on 65î nô Dc + The.efô!e, uhen of to :ÀTE 65w hre HA12010 2SA949 Lot No ùnr€ss 3 oùÈpùÈ(1kH2) sighàI thê àt 2SC1400 porer lated parès safety 2SA107slA/ 2SC2525lA/ fàcto! replàcin9/ idenÈrcèI schenaÈrc Cuê role!ènce except component of ic 50v votrage some Ior (v) inpur rnportance ârts y a! ) is àt (v) tâgé ùnless (x) , {c) ;:2i. capàc!ry thôut toreràncê be desrqnation diagrah, rmproweûênts but Èhe rn dcsrqh actùàl æc2æ1 Tvpê rr2-SOURCE-2,1 -20d8 ofF- STEREO-MONO 2S4978 2SA1100 2SC1919 2s,C2575 TUNER-PHONO.ÀUX orF-À-B-À+B indicaÈes the seitch posirion 7 I td 9 SCHEMATICDIAGRAMS,P.C. BOARD PATTERNS AND PARTS LIST . ' NOlES: o When ordering resistors, first conuert resistanceualues 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). 561...... . RDI/IPSE6AJ 56xlot 560st 473 . . R D % P SE i l E B J 47ha 47 x 103 jRs RN2H @BE r 0.50 olo .... RS/PEIIIOK Js) Ex 2 When there are 3 effectiue digits (such as in high precision metal film resis' tors). RNZas-R s62 x t0' s621, . s.62kç EEEEF . 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 Parts Miscellanous List of ChangedParts for Factory Modification CAPACITORS Part No. CKDYF 473250 Symbol & Description C1-C4 SEMICONDUCTORS Part No. 2SA1075lAt-G 2SC2525lAl-G Symbol & Description 01, 04 02, 03 OTHERS Part No. Symbol & Description I err-eoa A eex-qos A nsr-srs T1 FUl sl 1 Power transformer Fuse{2.5A) Leverswitch (POWER) P.C.BOARD ASSEMBLIES Part No. Description GWK-130 GWX.335 GWX.336 GWX.337 GWX.334 AF assembly SP switch assembly Headphone assembly Fuse assembly Terminal assembly GWX-333 GWS-I94 GWS-r93 GWS-I92 GWG-130 Tape terminal assembly Switch assembly Mode assembly Muting assembly Volume assembly GWG-129 AWV.OO4 Control assembly Indicator assemblY List of changed parts information will be furnished whenever necessary and you are requested to amend parts n u m b e r i n t h i s p a r t sl i s t . 10 i A s s ' y( G W X - 3 3 7 ) SPSWITCHAss'y(GWX-3351 12 H HEAD PHONEAss'y (GWX-336) SPEAKERS AB NDICATORAss'y(AWV-004) 10 '12 T A P ET E R M I N A LA s s ' y( c W X3 3 3 ) Rrcr 100( V O L U M E A s s ' y( G W G 1 3 0 ) MUTINGAss'y TCUDNESS Fh"r- 1 l.l- I l.|.JL'-" i"" ffi1,.r" [H tï *ifi t i*r C O N T R O LA s s ' y ( G W S - 1 2 9 ) 1S T E R M I N A LA s s ' y (GWX-334) I e2l a I SWITCH Ass'y (GWS -1 e4) I ) l I I Se't,, 59'. 6 ï â.+ li l'n" il c( .'_- / )É Ae. t, 2w- .,@o@ li l+ ^- .qOWER Tr o@@_ tl I A F A s s ' y( c W K - 1 3 0 ) . siA-7clEt 9 . 4 P A R T SL I S TO F P . C .B O A R DA S S E M B L I E S AF Assembly(GWK-I30) SEMICONDUCTORS CAPACITORS I Part No. Symbol & Description Part No. Symbol & Description A ACH-212 A ACG-004 ccDsl 050D 50 ccDSL 270K 50 c c D S L 4 7 0 K5 0 c503, c504 c502, c505, c506 c 3 1 1 , C 3 1 2C , 4 0 9 ,C 4 1 0 c413, C414 c401, c402 2SAg78 2SC1 9 19 (2SC1 400) 2S4949 2SA798_c ccDSL 680K 50 ccDSL 221K 500 C K D Y B4 7 1K 5 0 coMA 473J 50 coMA 473J 250 c c D S L 1 0 0 K5 0 c405, c406, c407, c408 c 4 15 - C 4 1 8 c30s, c306, c319, c320 c421, C322 c411, C412 c425, C426 25C2291 2SA726S 25C2229 * 2SA968-Yor O * 2SC2238-Y or O cosA 271J50 cosA 122G 50 coPA 183G50 coPA 683G 50 C E A N L3 R 3 M5 0 c301, c302, c509, c510 c315, C316 c 3 1 3 ,C 3 1 4 c 3 1 7 ,C 3 1 8 c303, c304, c403, C404 2SK34 25D112 ( 2 5 D 3 13 ) 2S8682 ( 2 S 8 5 0 7) CEANLNP 4R7M 50 CEANL 470M 16 CEANL 470M 35 cEA 010P 50 c E A 2 R 2 P3 5 C321,C322 C307,C308 C325 C517 C 5 11 . C 5 12 2SC945A (25C2515) 0505. 0507, 0508 2SA733A (2SA1100) 0506 2SA904A o509 C E A R 4 7 P5 0 c E A 1 0 0 P1 6 c E A 1 0 0 P6 3 c E A 1 0 1 P1 6 c E A 1 0 1 P2 5 c419, C420 c 5 13 c 5 16 c 5 15 c424 2 S C 13 8 4 0 5 10 15 2 0 7 6 Irbt555' 1S 15 5 5 D401- D404,D411 -D41 4 c E A 1 0 1P 3 5 cEA 331P 63 c E A 4 7 1P 6 c E A 1 0 2 P5 0 c323, C324 c507, c508 c 3 0 9 ,c 3 1 0 ,c 5 1 4 c423 STV3H.Y D 4 0 9 ,D 4 1 0 D 4 1 5 ,D 5 0 5 - D 5 0 8 RESISTORS When ordering resistors, conuert the resistance ualue into code form, and then reutrite the part no. as before. PartNo, Symbol& Description Note: 0301, 0302 0303, 0304 0305, 0306, 0409, 0410 o 4 0 1 ,0 4 0 2 0403, 0404 o405, 0406 0 4 0 7 ,0 4 0 8 , 0 4 1 5 , 0 4 1 6 4411,4412 o 4 1 3 ,o 4 1 4 * h f e o f o l 1 1 - O 4 1 4 s h o u l d h a v et h e s a m ev a l u e A roez ( s r B o-l0 2 ) MZ-240 lwz-2401 A snsnu-a 0501, 0502 0503, o51 1 o504 D405- D408 D 4 16 MZ-177 D501-D504 D509 {wz-1771 MZ-150 D 5 10 (wz-150) RD%PM trtrtr J R303-R316, R325-R334. R337. R 4 0 1- R 4 0 4 , R 4 0 7 - R 4 1 8 , F . 4 2 3 - R 4 2 6 R429-R436, R443-R446, R451-R454 R503-R510 R 5 12 - R 5 1 4 F.419-R422 RD%PM DlC J RD%PM !!tr I J A nozpu rrr L RN7"SODO't] RSlP OC! J F A Rozplvrrr.r R D % P SC l O J A ncN-oso R S 2 Pt r l D J :i_ Rozpsr rra I R317-R322 R 3 2 3 , R 3 2 4 , R 4 4 7 - R 4 5 0 , R 5 11 R335, R336 R42t.R428. R501, R502 R439-R442 R515, R516 R437, R43B A rszazr MZ440 D 5 11- D 5 1 4 D 5 15 (wz-140) OTHERS Part No. ASD.l 18 ASR.O23 Symbol & Description S9 RL1 R o t a r y s w r t c h( F U N C T I O N ) Relay SPSwitchAssembly(GWX'335) (GWG-I29) control AssemblY Note: CAPACITORS Symbol & DescriPtion Part No. Part No. When ordering resistors,conuert the resistance ualue into code form, and then rewrite the part no. as before. Symbol & DescriPtion ccDsL 100D50 ccDSL 270K 50 CKDYB681K 50 coMA 392J 50 c205, C206 c 2 1 5 ,c 2 1 6 c 2 1 1 ,c 2 1 2 c219.C220 coMA 223J 50 coMA 104J50 c E A 1 0 0 P1 6 oEA220P 25 c E A 1 0 1 P1 0 c221, C222,C225, c226 c227, C22A c209, C210 c233 c207, C208 c E A 1 0 1 P3 5 C E A N L N PO l O M5 0 CEANL 2R2M25 C E A N L3 R 3 M2 5 C E A N L3 R 3 M5 0 c231, c232 c229, C230 c217, C218 c223, C224 c201, C202 FuseAssembly(GWX-337) C E A N L4 R 7 M5 0 c213, C214 Part No. Symbol & DescriPtion I ncc-oor c501 Part No. Symbol& DescriPtion A R o z p un n r l A C T - 11 7 ACT-118 R201-R207,R213,R214,R219-R236, F.241-R243 R208-R212. R215, R216, R239, R240 R217.R218 R237, R238 V R 2 ,V R 3 VR4 V a r i a b l e( B A S ST, R E B L E ) (BALANCEI Variable 2S4978 2SC1919 (2SC14001 2SA949 (2SA9051 RD%PM222J ASH-O15 AKB-055 Symbol & Description 0201,4202 0203, 0204 0205, 0206 Symbol & Description R301, R302 Slide switch 58 ( P H O N EI N T E R F E R E N C E } T e r m i n a l( I N P U T ) TapeTerminalAssembly(GWX-333) Part No. SEMICONDUCTORS Part No. P h o n ej a c k ( P H O N E S I TerminalAssembly(GWX-334) Pert No. RDTAVS CtrD J RSl P trtrtr J Symbol & Description AKN-023 RESfSTORS RD%PMlDtr J R601.R602 R603. R604 R605, R606 R o t a r ys w i t c h( S P E A K E R S I SlO Assembly(GWX'336) Headphone Part No. When ordering resistors, conuert the resistance value into code form, and then rewrite the part no as before. Note: RS2Ptrtrtr J RD%PMtrtrtr J RSlP trtrtrJ ASD-104 RD%PM 394J RD7.PM 1O4J AKB-O54 AKP-024 Svmbol & Description R 1 0 1R , 102 Rl03, R104 Terminal {TAPEI Connector socket SwitchAssembly(GWS-I94) Part No. SYmbol & Description SWITCH Part No. Symbol & Oescription s6,s7 (GWS-I 93) Mode Assembly ASK-158 Part No. RDy.PM 332J A S K - 15 8 ASK-160 ASK-160 S1 S2 Leverswilch(DUPLICATEI Leverswitch(TAPEMONITOR) Lever (TONE, SUBSONIC) Symbol & Description R 1 0 9R , 110 Leverswitch(MODEI 54 e Muting Assembly (GWS-192) Part No. RD%PM 562J RD%PM 473J ASK-158 Symbol & Description R 1 0 7 .R 1 0 8 R105,8106 Leverswitch(MUTING) 53 I