Service Manual Pioneer SA 610
Contents
1. 52 2 75 R25 ASK 172 OFF 955 56 amp 22k Sa R33 220 ces R7 6 56 Aris Jem T 1 43k RI BALANCE 22 50 5 55 ON ACT 130 835 cer 21265 Ik 100k 56 PLAY OS C 22 cie 0047 25 14 L 524 54 SUBSONIC 2 1 a5 0 47 50 14 ASK 171 ES PHONO AS p a 25 1919 6 G2 2SCI815 GR orr 5 1 50 59 p 7 1 Vs Na 55 6 Res 100k hs oinnes 256 CONTROL V2 GWG 138 Ro T 58 17 621479 M L ch 15k 220 PHONG 4 78 65 27 885 62 2 RIS TUNER AUX 83 1 ws RES 1 FUNCTION C84 56p ANS ue 39ktF 48 7 rune orr 0 10 9 p 0 03 TAPE 2 E 58 1 22 PLAY 6058 0056 ON 1 4 R27 188 67 279 0 0012 2 26 6 4 TUNER 1 T 1 55 VOLUME 1 R89 ssy 1 4 1 10x n 1 1 RAI s 459 250k 0 0056 6 0012 150mV 79 45 005 060 0 047 25 22. Manual STEREO AMPLIFIER A 610 Q PIONEER e This service manual is applicable to the KU type CONTENTS 1 SPECIFICATIONS 3 2 FRONT PANEL FACILITIES 4 3 DISASSEMBLY 6 4 PARTS LOCATION 6 5 BLOCK DIAGRAM 8 6 LEVEL DIAGRAM 8 7 CIRCUIT DESCRIPTIONS 9 8 ADJUSTMENTS 10 9 EXPLODED VIEWS AND PARTS LIST 11 10 SCHEMATIC DIAGRAM P C BOARD PATTERNS AND PARTS LIST 10 1 Miscellanea 14 10 2 Schematic Diagram 15 10 3 P C Board Connection Diagram 18 10 4 Parts List of P C Board Assembly 21 11 2 22 1 SPECIFICATIONS Semiconductors jc EDU 3 Transistors 4 eve an Seu w ba 27 Diodes o ee Ghd Sea Bee ws 18 Amplifier Section Continuous power output of 45watts per chan nel min at 8ohms from 20Hertz to 20 000 Hertz with no more than 0 03 total harmonic distortion Total Harmonic Distortion 20 Hertz to 20 000 Hertz 8 ohms from AUX 22 5 watts per channel power output dem No more than 0 0296 Intermodulation Distortion 50 Hertz 7 000 Hertz 24 1 8 ohms from AUX continuous rated power output No more than 0 0396 22 5 watts per channel power output No more than 0 0296 Damping Factor 20 Hertz to 20 000
3. 2 1 215 t 01 50 i 2 R44 R62 104 978074 R42 1k 100 220 625 1 22 D 3300p 584 Ik 1 100 25 Sy Rn 152076 i M T S 3500 10 R94 lt R46 cae I DOM 68 826 1 Q2 HAI2010 8 j 1 R64 18 6 06 7 w 870 08 R72 10 100k Ears 5 470 28 H T 4 IL Ass y 2 2 GWG 138 ESABTS E 5 836 C28 836 100 S6p 2 100k C26 2 2 50 9 uS 9 892 110k 1 L 2562588 Q gt Ne 59 220 35 09 1085 152076 COMPARATOR m St R74 Vi AAV 006 1 L8k W 5 DI POWER 5 22 Cs j d 22 47 i AEL 320 tiw 1 Q26 25 1885 8 sp2so Ta L cse 2 22 270 R78 Ave i a 2 T H E 669 35 EN m 2654 P P 4400 Toon Ars 2 Mz 270 50 50 577 arr 667 par oni Ass y 2 2 0 01 AC250 Az 8200 50 a GWK 144 1 S 1 gt T
4. Dod 1 VOLUME 0047 25 vR2 2 C74 VR4 2 7 AUX 1 250k 0 0056 100k R90 i 1 1 1 10 R30 00012 TUNER 55 L Q J 7 0 0012 R28 t 1 da 23 y 522 u J T 1 50 886 ces 18k PLAY C 0018 0 068 24 2 2 1 ces C64 1 IB 2943 003 1 28 9 R88 R82 2 7k D ek Yi R ch LI 4 Toop 4 86 47 380k sek o CONTROL Ass y 2 2 GWG 138 Re 100 PHONO 6 10 16 8 520 1 C80 0 047 25 PLAY lt 22p R20 tk 0 47 50 1 28 pe 5 REC 2 4 R26 26 2 2 50 2 2 S8 IM TRA ASK 171 0 33 50 ki At 220 59 220 35 32 1 SWITCHES 1 RESISTORS Indicated in 51 WW 15 tolerance unless otherwise noted k M F 196 G 12 K 10 tolerance 5 1 7 FUNCTION TUNER PHONO TAPE 1 AUX 1 2 CAPACITORS 52 TAPE 2 ON OFF indicated in capacity uF voltage unless otherwise noted pF Indication without voltage is 50V except electrolytic capacitor 53 LOUDNESS ON OFF 1 3 VOLTAGE CURRENT 54 SUBSONIC 15Hz ON v Signal voltage at 45 45 W 8 output 1kHz DC voltage V at no input signal 55 SPEAKERS OFF Value in is DC voltage at
5. 40 50 60 FREQUENCY 1kHz 7 CIRCUIT DESCRIPTIONS Equalizer Amplifier The SA 610 features a 3 stage direct coupled equalizer amplifier for greater reduction of noise and distortion Besides the use of an ultra low noise transistor 28C2602 in the first stage the adoption of low impedance input resistance and equalizer circuit has contributed to an S N ratio of at least 82dB at 2 5mV input IHF A Power Amplifier This all stage direct coupled pure complemen taly SEPP circuit features a current mirror load differential amplifier in the first stage and incor porates the tone control circuit in the NFB loop Although the incorporation of the tone control circuits in the power amplifier stage reduces the number of elements that the signal has to pass through and thereby further reduces noise dis tortion and cost the power stage does require a higher gain and a higher degree of stability In the 5 610 this high gain and high stability are achieved by a current mirror load differential amplifier in the first stage and by the use of a constant current circuit for the load of the pre driver stage Furthermore the tendency for the pre driver stage capacitance impedance load to cause deterioration in the high end frequency response is suppressed by inserting a capacitor C between the emitter of the pre driver stage Q2 and the base of the constant current circuit Q1 as shown in Fig 7 1
6. r 144 Ass GP25D wap x i Av 5 1 POWER H 19 2 ASK 520 627 250712 0 gt 4 3 I 1 e GP250 8 N neo I 2 L acies T T T A gt 2 L WHT 120V ETA 820 2 20 BED gt 1 1 i qma rl d SWITCHED UNSWITCHED TOTAL iSOW 200w SA 610 aa 9 HEADPHONES Ass y GWX 460 1 R96 35 330 1w amp R97 C 3300W R98 p gt 67 SP AT Iw 1 Len vl zea FL Ass y AWV 007 VRI 2 LEVEL ADJ ACP 078 MOO 2 2 1 VR2 7 C7 3300p AT 22k e pQ 1 cs L 33009 0047 00477 150 1 iA 2010 03 2010 16 LEVEL SHIFT CURRENT CONTROL gt 152076 OMPARATOR CONSTANT OFF SET CURRENT CONTROL LEVEL SHIFT o COMPARATOR le ser 0047 R2 56k C2 VI AAV 006 001 AC250 AC POWER CORD ADG 023 quem n 20 120 UNSWITCHED 200w 1 FUNCTION T ASX 113 1 TUNER AUX J
7. 2 FRONT PANEL FACILITIES D POWER SWITCH Set this switch to ON to supply power to the amplifier There will be a short delay when it is set to ON because the muting circuit has been actuated to suppress the unpleasant noise that is sometimes generated when the power is on and off 0 SPEAKER SELECTOR Use this selector to select the speaker system OFF Sound not obtained from speakers A Sound obtained from speakers connected to the A speaker terminals B Sound obtained from speakers connected to the B speaker terminals 8 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 you will be able to emphasize the sound in the low frequency range Con versely turning the bass control to the left from the center position you will attenuate the sound You can use the treble control to adjust the sound in the high frequency range 4 POWER METER This meter allows you to read out the rated power level on the fluorescent display tube when speakers with a nominal impedance of 8 ohms are connected to the amplifier s speaker terminals FUNCTION INDICATORS The TUNER PHONO TAPE AUX function indicators light up in accordance with the position of the function selector 6 FUNCTION SELECTOR Use this selector to select the program source When set the function indicator above the meter pane
8. SWITCH Ass y GWS 216 Appearance of Transistors and ICs 2SA912 25 1815 25 1885 Lot Lot No Type No Type No hre hre 25 1914 Sutfix Type No Lot No Type No Lot No hre hee BI B 25 1919 2582602 Lot No Type No hre 250712 28 1108 DNS 2SC2588A Lot Sr hre hre Lot No B 17 HEADPHONE Ass y GWX 460 ED Yo ond big 4 M 5 01 2152076 or 151555 SWITCH Ass y GWS 216 VOLUME Ass y GWX 459 18 SA 610 HEADPHONE Ass y GWX 460 VOLUME Ass y GWX 459 c1 0 01 250 56 OWER O P amp E z AC120V 60Hz UNSWITCHED 10 4 PARTS LIST OF P C BOARD ASSEMBLY Parts List of Amplifier Assembly GWK 144 CAPACITORS Part No Symbol amp Description CCDSL 101 50 1 2 102 501 54 221 351 C59 CEA 101M 50L C60 C61 C55 CEA 101M 35L C56 C77 CEA 101M 10L C83 C84 471M 6L C49 CEA 470M 50L C51 CEA 221M 10L C18 C17 CEA 470M 10L C33 C34 CEANL 010M 50 C71 C72 CEANL 2R2M 50 C25 C26 CEANL 100M 16 C4 CEANL R33M 50 C75 C76 CEANL R74M 50 C19 C20 CCDSL 030C 50 C37 C38 CCDSL 100K 500 C41 C42 CCDSL 220J 50 C7 C8 CCDSL 330J 50 C86 C87 CCDSL 470J 50 C5 C6 C21 22 C29 C32 CCDSL 560J 50 C15 C16 C27 C28 C88 C85 CCDSL 820J 50 C35 C36
9. At frequencies where the reactance of this capacitor may be ignored the push pull action of Q1 and Q2 serves to counteract the high end frequency response deterioration The power amplifier stage is a complementary 2 stage Darlington connection resulting in an output power rating of 45W 45W 80 20 2 20kHz harmonic distortion of less than 0 03 20Hz 20kHz at rated output and output power bandwidth of 5Hz 5OkHz 0 03 THD Certainly a superb performance for an amplifier of this class is obtained 8 Constant current 27 circuit Driver stage gt Pre driver stage Fig 7 1 Pre driver stage SA 610 Protection Circuit Besides protecting the speakers if a DC voltage should happen to appear at the power amplifier stage outputs this circuit also mutes the signal path when the power switch is turned on and off See Fig 7 2 If for any reason a DC voltage in excess of about 5V should happen to appear in the output of the power amplifier stage it is detected imme diately by either Q23 or Q24 Q23 is turned on by a positive voltage and Q24 by a negative voltage In either case Q25 is also turned off thereby opening the relay contact to disconnect the power amplifier stage from the speakers The muting action when the power switch is turned on is achieved by delaying the rise of the Q25 base potential by means of the R95 C77 time constant circuit When the power switch is turned on C77
10. 53 54 57 Lever switch 52 Lever switch S1 Remote slide switch T2 Heater transformer Terminal Terminal Relay 21 Parts List of Tone Control Assembly GWG 135 CAPACITORS Part No COMA 303J 50 COMA 124K 50 CQSA 270K 50 CQMA 122K 50 CQMA 562K 50 Note RESISTORS Part No ACT 127 RD PMO OQ Symbol amp Description C63 C64 C65 C66 C67 C68 C69 C70 C73 C74 When ordering resistors convert the resistance value into code form and then rewrite the part no as before Symbol amp Description VR3 VR4 Variable resistor 881 890 R101 8100 Parts List of Switch Assembly GWS 215 Part No ASE 003 RS1P 331J RD PM 563 Symbol amp Description S5 Slide rotary switch SPEAKERS R96 R97 R98 R99 11 PACKING Parts List Key Part No 1 ARB 351 2 754 3 AHA 239 Description Operating instructions Packing case Side pad Parts List of Switch Assembly GWS 216 Part No Symbol amp Description ASX 113 S6 Slide rotary switch FUNCTION Parts List of Volume Assembly GWX 459 Part No Symbol amp Description ACV 184 VR2 Variable resistor VOLUME Parts List of Headphones Assembly GWX 460 Part No Symbol amp Description AKN 023 Headphones jack PIONEER ELECTRONIC CORPORATION 4 1 Meguro 1 Chome Meguro ku Tokyo 153 Japan 1 8 PIONEER ELECTRONICS CORPORATION 85 Oxford Drive Moonachie New Jers
11. 57 K Ex 2 When there are 3 effective digits such as in high precision metal film resistors 5 62kn 562 x 10 5621 5 RNASR 6516120 e The mark 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 Miscellaneous Parts ASSEMBLIES OTHERS Part No Symbol amp Description Part No GWK 144 AF amplifier assembly ATT 667 T1 GWG 138 Tone control assembly AEK 100 F1 GWS 215 Switch assembly ASK 520 S8 GWS 216 Switch assembly AKP 032 GWX 459 Volume assembly ADG 023 GWX 460 Headphones assembly ANB 847 AWV 007 F L assembly AKE 051 SEMICONDUCTORS PATTERNS AND Symbol amp Description Power transformer Fuse Lever switch POWER AC socket Power code Front panel assembly Terminal SPEAKERS List of Changed Parts for Factory Modification List of changed parts information will be furnished when Part No Symbol amp Description 2SA1108 A Q 021 022 ever necessary and you are requested to amend parts Description orR 3 25C2588 A Q 019 620 hfe should have the same rank number in this parts list orR AEL 320 D1 LED CAPACITOR Part No Symbol amp Description ACG 001 C1 Capacitor 0 01 250V 14 1 10 2 SCHEMATIC DIAGRAM AF Ass y 1 2 GWK 144
12. CCDSL 151K 500 43 46 1032 50 50 1032 500 C39 C40 473K 50 C47 C48 CKDYX 473M 25 C78 C81 122J 50 C11 C12 COMA 183J 50 C9 C10 COMA 563J 50 C23 C24 683J 50 C13 C14 ACG 017 C62 ACG 004 C58 ACH 215 C52 C53 Note When ordering resistors convert the RESISTORS resistance value into code form and then rewrite the part no as before Part No Symbol amp Description RD R1 R8 R13 R14 R17 R18 R21 R50 R53 R54 R69 R70 R77 R79 R91 R93 R95 R105 R108 819 R20 R51 R52 R55 R62 R73 R75 R103 R104 RD RN PQGODJ RD PSFDunDJ 85 PSOOOJ RS 18060 ACN 070 R9 R12 R15 R16 R63 R64 R76 R80 R67 R68 R71 R72 R74 R94 R102 R65 R66 SEMICONDUCTORS Part No 25 2602 25 1919 25 1815 25 979 2561775 25 912 25 1885 25 2275 Q 2SA 985 0 25 1914 25 1384 250712 152076 151555 152473 STV3H 10 2 51801 02 GP 25D MZ 130 WZ 130 2 270 MZ 192 WZ 192 OTHERS Part No ACT 130 ASK 171 ASK 172 ASX 115 577 063 064 ASR 033 SA 610 Symbol amp Description 01 02 03 04 05 06 07 08 09 010 011 012 013 014 026 015 hfe should have the 017 018 same rank 023 024 Q25 Q27 D1 D4 D18 D5 D6 D7 D8 D9 D10 D11 D14 D15 D16 D17 Symbol amp Description VR1 Variable resistor
13. Hertz 8 ohms 50 Input Sensitivity Impedance ou are NOD S 2 5mV 50 kilohms TUNER ar 150mV 50 kilohms sao Y eR eis 150mV 50 kilohms TAPE PLAY 1 2 150mV 50 kilohms Phono Overload Level T H D 0 0596 1 000Hz xus we auper RET ee 130mV Output Level TAPE REC 2 ER Ead 150mV Speaker sos desk Sun RR Ei re A B OFF SA 610 Frequency Response PHONO RIAA Equalization RD 20Hz to 20 000Hz 0 TUNER AUX TAPEPLAY 1 2 Mme 10Hz to 60 000Hz 3dB Tone Control BASS p Sates na 10dB 100Hz TREBLE aa ua sad man aan 10dB 10 000 2 Subsonic Filter 15Hz Loudness Contour Volume control set at 40dB position 6dB 100Hz 3dB 10 000Hz Hum and Noise IHF short circuited A network PHONO er E pas te 82dB TUNER AUX TAPE PLAY 1 2 100dB Miscellaneous Power Requirements AC 120V 60Hz Power Consumption 100W UL Dimensions 420 W x 94 H x 347 D mm 16 9 16 W x 3 11 16 H x 13 11 16 D in Weight without package 6 9kg 15 Ib 362 Furnished Parts Operating Instructions 1 NOTE Specifications and the design subject to possible modifications without notice due to improvements Measured pursuant to the Federal Trade Commission s Trade Regulation rule on Power Output Claims for Amplifiers
14. 667 Switch assembly Switch assembly GWS 216 GWS 215 Volume assembly ud GWX 459 Headphones assembly F L assembly GWX 460 AWV 007 Tone control assembly GWG 138 socket 032 Terminal TAPE 2 AKB 063 A Power code ADG 023 Terminal INPUT AKB 064 Strein relief AEC 327 Terminal TAPE 1 Terminal SPEAKERS AKB 063 AKE 051 5 BLOCK DIAGRAM PHONO TUNER c REC 1 AUX 2 k PLAY PHONO TUNER rREC TAPE 1 RCH tpLay rREC 2 PLAY POWER HS SWITCHES ST FUNCTION TUNER PHONO TAPE 1 AUX 2 TAPE2 ON OFF 65 LOUDNESS 08 OFF 54 SUBSONIC 15Hz 55 SPEAKERS 56 POWER se TONE OFF ON OFF ON OFF 6 LEVEL DIAGRAM VR 1 BALANCE CHANNEL SAME AS L SUPPLY CIRCUIT p POWER TO EQ amp etat INDICATOR CIRCUIT POWER VR2 VOLUME VR3 Bass VRA TREBLE TONE CONTROL CHANNEL gt PROTECTION CIRCUIT U SPEAKER A LSPEAKER B METER DRIVE amp NDICATOR CIRCUIT Deer 30 SPEAKERS 19v RL 840 20 10 POWER GAIN 42 108 Head Phone 882 49dB 10 AUX TUNER 20 LEVEL 67 30 EQ AMP GAIN 35 5dB s 98 1V
15. djust the VOLUME control so that the voltage on the output terminals SPEAKERS read 9V AC Adjust VR1 Lch and VR2 Rch of the in dicator assembly so that the output power indicator read 10 watts AF Amplifier Assembly GWK 144 Jumper wire H LOTO Jumper wire B evn2 me F L Meter Assembly 9 fe Fig 8 1 Adjustment point 12 SA 610 9 EXPLODED VIEWS AND PARTS LIST Exterior Component Parts List NOTE Parts without part number cannot be supplied e The mark found on some component parts indicates the importance of the safety factor of the part Therefore when replacing be sure to use parts of identi cal designation Key No Part No Description 1 ANE 269 Bonnet case 2 079 Screw 3 AAD 200 Lever knob 4 ANB 847 Front panel assembly b AAB 222 Knob 6 223 Knob 7 AAB 221 Knob 8 8 186 Screw 9 Bottom plate 10 ABA 066 Screw 11 Interior Component Parts List Key No Part No 1 667 2 3 4 GWS 215 ASK 520 6 ACG 001 7 GWX 460 8 GWG 138 9 AWV 007 10 11 12 GWS 216 13 GWX 459 14 15 AEL 320 16 17 18 AKP 032 19 20 ADG 023 21 227 22 051 23 24 100 25 GWK 144 Description Power transformer Wire cli
16. ey 07074 U S A PIONEER ELECTRONIC EUROPE Luithagen Haven 9 2030 Antwerp Belgium PIONEER ELECTRONICS AUSTRALIA PTY LTD 178 184 Boundary Road Braeside Victoria 3195 Australia ART 478 0 FODEC 1978 Printed in Japan
17. h to the 15Hz position during record play for the best effect TONE SWITCH Set this switch to ON when adjusting the bass and treble controls When set to the upper OFF position the tone control circuits are disengaged and frequency response is flat This function is convenient for checking phono car tridge and speaker tone quality and listening room acoustics POWER INDICATOR When the power switch is set to ON this lamp lights up indicating the amplifier is turned on SA 610 42 LOUDNESS SWITCH When listening to a performance with the volume control turned down set this switch to ON and the bass and treble will be accentuated When the volume is low the human ear finds it harder to hear the bass and treble than when the volume is high The loudness switch is thus designed to compensate for this deficiency By setting it to ON the bass and treble come through much more strongly and the sound takes on a punch even when the volume control is turned down 3 TAPE 2 SWITCH Set this switch to the ON position when monitoring a tape performance on a tape deck which you have connected to the TAPE 2 jacks or when monitoring a recording NOTE Set the switch to the upper OFF position when listening to records or broadcasts etc selected by the function selector BALANCE CONTROL Use this control to balance the volume of the left and right channels If the sound appears to be louder the right it means that the vo
18. is charged up via R95 thereby increasing the voltage across both ends of this capacitor When this voltage exceeds the zener voltage of the D15 zener diode Q25 is biased in the forward direction and is thereby turned on to close the relay contact When the power switch is turned off C77 discharges rapidly via D18 resulting in Q25 being turned off thereby opening the relay contact j t L CH SP OUT R CH SP OUT Fig 7 2 Protection circuit 8 ADJUSTMENTS 8 1 1 IDLE CURRENT ADJUSTMENT Set the SPEAKERS selector to the A position and connect an 89 resistor to the speaker out put terminals Turn the VOLUME control down to minimum level turn the power on and wait about 10 minutes Connect a DC voltmeter to the TP terminals Lch TP4 and TP3 Rch TP2 and TP1 of the AF Amplifier Assembly GWK 144 Check that the voltage between TP4 and Lch lies within the DC 4mV 50mV range then make a similar check for the Rch between TP2 and TP1 If the voltage is less than 4mV cut jumper wire A Lch and jumper wire B Rch If the voltage exceeds 70mV check for circuit failure 8 2 OUTPUT INDICATOR ADJUSTMENT 1 2 Set the TONE CONTROL to the center position Set the SPEAKERS selector to the A position and connect an 80 resistor and AC voltmeter to the speaker output terminals Set the FUNCTION switch to the AUX position and apply a 1kHz 150mV signal to the AUX terminals A
19. l correspond ing to the position of the function selector will light up TUNER Set here when listening to broadcasts on a tuner connected to the TUNER jacks The TUNER function indicator lights up PHONO Set here when playing records on a turntable connected to the PHONO jacks The PHONO function indicator lights up TAPE 1 Set here when playing tapes on the tape deck connected to the TAPE 1 jacks The TAPE function indicator lights up AUX Set here when listening to a program source which is connected to the AUX jacks The AUX function indicator lights up VOLUME CONTROL Use this control to adjust the output level to the speakers and headphones Turn it clockwise to increase the output level No sound will be heard if you set it to 0 HEADPHONE JACK Plug the headphones into this jack when you want to listen through your stereo headphones NOTE Set the speaker selector to OFF when listening only with head phones 9 SUBSONIC FILTER SWITCH When this switch is set to the 15Hz position the subsonic filter with a cut off frequency of 15Hz is actuated The subsonic filter serves to attenuate frequencies lower than 15Hz in a 6dB oct slope It is therefore effective in suppressing ultra low frequency noise which is generated by record warp and other causes You cannot actually hear this noise but it is a factor in the generation of intermodulation distortion and it may damage your speaker system Set this switc
20. lume of the right channel is higher Turn the balance control to the left and adjust Conversely if the sound appears to be louder on the left it means that the volume of the left channel is higher Therefore turn the balance control to the right and adjust 3 DISASSEMBLY Bonnet Case Bottom Plate Remove the four screws 6 Remove the six screws Front Panel Remove the four screws Front panel Knob Knob 4 PARTS LOCATION e The mark 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 Front Panel View designation Knob FUNCTION AAB 222 Knob SPEAKERA BASS TREBLE AAB 222 Front panel assembly ANB 847 Knob VOLUME AAB 221 Knob BALANCE AAB 223 Lever knob POWER SUBSONIC TONE AAD 200 Lever knob LOUDNESS TAPE 2 AAD 200 SA 610 Front View with Front Panel Removed Fluorescent indicator tube AAV 006 Slide rotary switch FUNCTION ASX 113 Variable resistor BASS TREBLE ACT 127 Slide rotary switch SPEAKERS ASE 003 Variable resistor VOLUME ACV 184 Variable resistor BALANCE ACT 130 Lever switch TAPE 2 Lever switch POWER ASK 520 Headphones jack AKN 023 ASK 172 Lever switch SUBSONIC TONE Lever switch LOUDNESS ASK 171 ASK 171 Top View with Bonnet Removed AF amplifier assembly Power transformer GWK 144 ATT
21. p Frame Switch assembly Lever switch Capacitor Headphones assembly Tone control assembly F L assembly Cushion LED socket Switch assembly Volume assembly Cushion rubber LED Panel stay Heat sink AC socket Rear panel Power code Strein relief Terminal Terminal GND Fuse AF amplifier assembly Key No 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Part No ASK 171 ASK 172 ACT 130 AKB 063 AKB 064 AEC 672 ABA 107 ABA 066 ABA 234 ABA 026 M45 086 B71 004 ABE 005 ABA 240 ABA 198 AEC 352 AEC 488 28A1108 A Q or R 28C2588 A Q or R ABA 145 SA 610 Description Lever switch Lever switch Variable resistor Terminal Terminal Frame Foot assembly Screw Screw Screw Screw 11 spacer Nut 90 Washer Screw Screw Remote wire Nylon rivet P C B holder Insulator spacer 2 hfe should have the Transistor same rank Screw 10 SCHEMATIC DIAGRAM P C BOARD PARTS LIST 10 1 MISCELLANEA NOTE e When ordering resistors first convert resistance values into code form as shoun in the following examples Ex 1 When there are 2 effective digits any digit apart from 0 such as 560 ohm and 47h ohm tolerance is shown by J 5 and K 10 5602 56 x10 561 u a RDAPS BAM J 47k 47 x10 473 o vs RDAPS ADB J 0 50 0R5 RN2H RG K 1 detre
22. rated power lt mA DC current at no input signal S6 POWER ON 1 4 OTHERS OFF gt Signal route SER TONE Adjusting point The mark found on some component parts indicates the im The underlined indicates the switch position 1 portance of the safety factor of the part Therefore when replacing be sure to use parts of identical designation This is the basic schematic diagram but the actual circuit may vary due to improvements in design SWITCH Ass y GWS 215 11 72 ks r E Sr A R96 oa 36 35 1 Y s p TP 1 MIN 152016 55 85 2 95 3 55 4 zu 1 R99 39 25 9 2 81 T 6 56 53 28C2275 RELAY 21 05 458 033 Le 7 152473 E TOME ED 67 i 9 R67 OL Ass y 1 2 GWG 138 STV3H o o 18 A 5 Bass TEN RTI 1O 1 2W f D F 628 ACT I27 nao ARST JESN 100k 869 GJ OFF 8 6 VR3 1 100k RBI Tor S5 SPEAKERS 1 005 _ 100 50 1 lt 2SCI77SA E i t i as 10p 822 9 683 7 653 190 2SCISIGA G 103 WoT Stk A E 924 1 IV 013 14 245 2SCI914A 6
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