Yamaha A-760II Page 9 Service Manual Download | Manualshive

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Summary of Contents for A-760II

Page 1: ...h a Mode Control 1 Volume Control Phono Selector Speaker Switch Rec Out Selector o Phones Jack f Input Selector Bass Control CONTENTS Rear panel 1 Names of the Parts 2 Disassembly Instructions 3 Specifications 5 Adjustments 6 Block Diagram 7 Printed Circuit Layout 7 Printed Circuit Board Wiring _ 9 Complete Circuit Diagram 10 3 SINCE 1887 YAM A H I 004458 I NIPPON GAKKI CO LTO HAMAMATSU JAPAN 82 3...

Page 2: ...r APPtlUU L I r U S A and Canadian Models Gnd terminal o Tape 1 2 record playback acks Phono input jacks Speaker A B ter minals Tuner input jacks o AC outlets o Aux input jacks o Power cord r sz I OYAMAHJI eaowerr s IItPPOllaW CQ UD Australian and British Models O YAMAHA s ooWll ns lQl N IPPONGAUl ce lT D European Model OYAMAHA HO 12 0 2 0 4 0 1IQ 1 S 3 C rrs a OO Hl c roJt GUJtI CD UD General Mod...

Page 3: ...er transformer il Main Direct switch Main board 2 NA0786 1 2 Tone control board 1 NA07859 1 Heat sink Main board 4 NA07861 4 Power transistor Main board 5 NA07861 5 Main board 1 NA0786 1 1l Power switch Function board NA07857 Primary board 1 Tone control board 3 NA07859 3l Primary board 2 Tone control board 2 NA07859 2 2 ...

Page 4: ... the front panel by pulling forward Photo 4 5 Removing the function board a Remove the top cover step 1 b Detach the various cords and connectors then detach the flexible wire fro m each switch with a screwdriver Fig 1 c Take out screws photo 4 to remove the function board Fig l 6 Removing tone control boards 1 2 and 3 main boards 4 and 5 and the power switc h a Remove the top cover bottorn cover ...

Page 5: ... 6 Make sure that transistors TR321 and TR322 are correctly connected to the heat sink for proper heat dissipation Photo 6 A 760 II 8 Removing the power transformer and pr ima ry boards 1 and 2 a Remove the top cover step 1 b Remove the primary board wiring c Take out screw CD in photo 7 and release pr ima ry boards 1 and 2 from board fasteners and d Remove the power transformer cover by taking ou...

Page 6: ...00 kH z 0 to 60 dB _ 2 dB Damping Faetor Headphone Output lmpedance 8 ohrns 1 kHz Better than 65 0 01 THD 0 72 V 8 ohms Frequency Response 6 8 V 100 ohms Auxt ape Tuner to Sp Power Supplies 120 V 60 Hz U C Out 8 ohms 1 Hz to 100 kHz 220 V 50 Hz G W 0 2 dB 240 V 50 Hz A B RIAA Deviation 110 1 20 220 240 V Phono MM 0 2 dB 50 60 Hz R Phono MC 0 3 dB Power Consumption 350 W 850 V A Cl Input Sensitivit...

Page 7: ...03 2 0V 0 1V same as 2 ler current no load and adjust B B and P1 TP3 FEMKO above check for rated voltages DEMKO Main board 1 Idling TP3 TP4 L same as 3 Minimum volume VR301 L ch 6 6 g mV adjustment TP1 TP2 R abo ve VR302 R ch Output off L R within same as 4 Minimum volume Speaker terminals set check o 30 mV above It is not necessary to check the photo coupler current of step 2 except when replacin...

Page 8: ...UTING 1 BALANCE BASS TREBLE VOLUME AUX TUNER t___1 HEAD PHONE PB TAPE PB 2 TAPE t 7 i SPEAK ER REC 1 ROf fer tON R REC 2 POWER SWITCH 0 0 47 5 V constant ACI N 47 5 V constant PRINlED CIRCUIT BOARD PAnERN SIDE COMPONENTS LAYOUT Primary c board Australian British and European Models U TR O I n J J I I I I 7 ...

Page 9: ...8 L paeoq l IOJ UO l auoj e ...

Page 10: ...TED CIRCUIT BOARD PATTERN SIDE COMPONENTS LAYOUT Primary c board U S A and Canadian Models Primary c board General Modell Function circuit board Main e board 5 Tone control c board 3 Tone control c board 2 ...

Page 11: ...RY C Board 2 ro E CONTOOL C Boord CIl 1 1 I IMAI N C B O O fd S1 L I I _ d I BA SS TRE L I HIGH LOUDNESS BALANC I FILTER I I l r i J c I I tJ 1 TONE COtH ROL C SOlJrd 21 _ _ J LlS T NlNG L V L HOHn MONITOR l ort Al O I OLU ME lAI DIRC T LAMF OISC LA UTINO LA ...

Page 12: ... CIRCUIT LAYOUT WIRING r I o I 0 I r u c Mod 1 I I I SWl TC lIEO UIlSWIT CJC D 1OO M tllC TOT zoo U ll AC OUTI ETI I I I I ri i oe PR I A Y C BO Q d r i A C Boordl 1 I I 1 1 I j I I L c I I ß L _ _ CO __ __ C J I I 9_ ...

Page 13: ... Board Tone ontrol Circuit Board Function Circuit oard 5 Main Clrcuit oard 6 Control Circuit Board U C models 11 R model 12 A G B W models 13 Notes DESTI TION A BREVIATIONS U U S A C CA DIAN G NORTH EU OPEA B ITISH R GENERAL A AUSTRALI N W WEST GERMANY SINCEI887 YAM H NIPPON GAKKI CO LTD HAMAMATSU JAPAN 100445 81 ...

Page 14: ... A 760 II EXPL DED V IEW Aliover 1 ...

Page 15: ...A C 17 MG 00 07 80 AC Cord Black 2m6A250V I U J r R n MG OO 13 60 2m13A 125V U C MG OO 09 10 2m6A 250V W G MG OO 09 ZO MG OO 10 00 Gray 2 5m7 5A250V Black 2m6A ggv A B 18 EN 33 00 10 Bind Head Tapping Screw 3 X8 FCM3 Bt 1ti 1 1 I t I 19 EZ OO 14 00 Screw for Ground Terminal 3 x 13 5 MFN i ll AJ 1 f l ZO EV 90 13 60 Sems Plain Washe r 3 6 1 0 tO 6 FNM3 3g 1ti i AAljl ii 21 NA 07 85 70 Function Circ...

Page 16: ...itc h SW A 760 45 BA 07 95 70 Cover Power Transformer 7 AtJ J RA G B BA 07 99 10 n U C 4 6 CB i60 24 30 Isolation Plate 1It J CB 60 4 6 10 R U A G C B 4 7 CB 60 29 20 Speacer Switch SWA tt C 48 CB 09 97 40 Slit Cover AI t tJ 49 CB 0 9 9 8 30 Support P C p C tt f 50 CB 09 9 9 10 Rubber Anti Vibration 1lJi1i iJ 51 CB 60 05 70 Bush 1 1 7 1 52 CB 60 1 4 40 Stopper Voltage Selector VSA I R 53 BB 06 97 ...

Page 17: ...IJ I C FA 15 3 3 90 Mylar Capaeitor 0 0039 uF 50V J 7 7 I gJ HJ 35 6 1 00 Carbon Resistor 1xnRD25 IJ f JliJjt HJ 3 5 8 8 20 820Kfl g HJ 35 7 1 00 10Kfl g HJ 35 5 1 50 150fl n HJ 35 8 4 70 470Kfl 1 HJ 35 71 00 10Kfl l HJ 3 5 71 20 12Kfl HJ 3 5 5 6 80 680fl HJ HJ 3 5 9 2 20 2 2Mfl HJ 35 68 20 8 2Kfl HJ 3 5 6 1 00 1Kfl H HJ35 61 80 1 8Kfl n I HJ HJ 3 5 72 70 n 27Kfl i HJ 3 5 6 6 80 n 6 8Kfl I HJ 3 5 ...

Page 18: ...n 110 Rl11 HJ 35 55 60 5600 n Rl12 Rl13 HJ 35 63 30 3 3KO R114 r R115 HJ 35 41 00 10n Rl16 Rl17 HJ 35 51 50 n 1500 RllB R119 HJ 35 63 30 3 3Kn R120 R121 HU 57 78 20 Metal Film Resistor 82KOSN14K2E FI R122 i a lltJll m R123 HU 57 66 80 6 8K 1 R124 R125 HJ 35 41 00 Carbon Resistor 10 1 RD25 R126 tJ m I R127 HJ 35 52 70 2700 R12B R129 HJ 35 84 70 470Kn 132 R133 HJ 35 34 70 4 7 1 R134 HJ 35 71 50 15 K...

Page 19: ... 7 7 J C345 FZ 00 3 2 70 Electrolylic Capaeiter C346 15000 F 56V 71J I J C347 FG 41 21 00 Ceramic Capaeiter 1OOPF 50V K t 7 J C348 UW 83 72 20 Electrolytic Capacitor 22 F 16V J C349 UW 86 64 70 n 4 7 F 50V C350 FC 0 4 S1 00 Mylar Capaeiter 0 1 F 400V K 7 7 J C351 UW S6 S2 20 Electroivtic Capacitor 0 22 F SOV J C352 FM 11 71 00 10 F 50V B P J C353 UW 83 72 20 22 F 16V J C354 FM 39 8 1 00 100 F 16V ...

Page 20: ...HJ 35 5470 4700 u R379 38 2 HL 71 61 80 Metal Oxide Film Resister 1 8KO 1P Diillttit R383 386 HJ 35 71 20 Carbon Resister 12KO RD25 tJ llttit R387 R388 HJ 3 5 63 90 3 9KO R389 R390 HJ 35 61 50 1 5KO R391 396 HV 35 61 20 Flame Preef Carben Resister 1 2Kn RDF25SF r tI 1t1 1 1 tm R397 R398 HV 35 5270 H 2700 H H R399 R400 HV 35 58 20 8200 R401 R402 HJ 3 5 64 70 Carben Resister 4 7KO RD25 lJ lltm R403 ...

Page 21: ...0 390KO H R470 HJ 3 5 74 70 H 47KO n H R471 HJ 35 72 20 n 22KO H R472 HJ 35 68 20 8 2KO H R473 HJ 3 5 64 70 4 7KO R474 HL 82 52 20 Met al Oxide Film Resistor 22002P Diiflfm R475 R476 HJ 3 5 71 00 Carbon Resistor 10KO RD25 t J 1 t tt H H R477 HJ 35 66 80 6 8KO R478 HJ 35 81 00 100KO H H R479 HJ 35 76 80 68KO n R480 HJ 3 5 6 6 80 6 8KQ R481 HJ 3 5 62 20 Carbon Resistor 2 2KO RD25 t J 1 t J m R482 HJ...

Page 22: ...240 GR BLI TA343 TR344 iA 0 9 0 00 n 2SA970 GR BL TR345 iA 09 9 9 10 2SA999 E F n TA346 TA347 iC 22 40 00 2SC2240 GR BL TR349 iC 27 0 5 00 n 2SC2705 ü Y g iF oo 20 80 Zener Diode HZ16L 3 lI 1 1 t I I g iF iF 00 00 40 9096 70 Diode 151555 152473 1 t 1 l lnter Tc angeabTe 0307 310 iF 0 0 14 00 15S82 0311 D312 iF 0 0 34 80 Zener Diode HZ3Cl l I 1 1 t I 0313 316 iF 00 15 10 HZ 6C1L 0317 320 iF 0 0 0 6...

Page 23: ...usher Transistor BB 0 6 9 8 0 0 Metal Httinq Earth 3P P 7 5 4P i 5 _ BK 1 Pin 1P i 12 7 I 7 illI H 4P7 y TI 2 51 T A I f y CJ 7 f TA f f I TR7 y1 7 AitA West Germany Model NA 07 96 20 Tone Control Circuil Boa 1 e230 FG 45 51 00 Ceramic Capacitor H FG 41 2 1 00 H UA 25 41 00 Mylar Capacitor g1 UA 25 43 30 11 FG 41 24 7C L GE 90 0 8 40 Coil L GB 90 03 30 HJ 3 5 53 30 Carbon Resistor I g HU 07 62 20 ...

Page 24: ...513 HV 35 41 50 Flame Proof Carbon Resistor R514 HL 82 53 90 Metal Oxide Film Resistor 15Kil isn 470il tr isn RDF25SF 390il 2P 1 11 1t h t l ttt U atl ttt VA50l HT 41 0 1 50 Solid Variable Resistor B4 7KO SR29R v I I VR IC501 iG 04 0 8 00 Triger IC I ti IC D501 0502 50 5 iH 00 0 8 80 iH 00 00 60 Bridge Diode Diode SIWB 100 4 7 l I t 1 1 1 SCA i H 00 0 9 00 501 502 SCA iH 00 1 1 10 503 Triae SMOR5G...

Page 25: ...16 HV 35 41 50 Flame proof Carbon Resistor 15 n RDF25SF l 1t h I llitt R517 HL 8 2 5 3 90 Metal Oxide Resistor 390n 2P H llitt VR501 HT 41 0 1 50 Solid Variab le Resistor B4 7Kil SR29R v I VR IC501 i G 04 0 8 0 0 Triger IC I ti IC D501 i H 00 08 80 Bridge Diode SIWB 7 l t r 7 I 1 0502 i H 0 0 00 60 505 Diode 10D 4 1 t I 0 506 0507 iF 0 0 19 40 Zener Diode I T 1 t r SCR 501 502 i H 0 0 0 9 00 Triac...

Page 26: ... Flame Proof Carbon Resistor 15f1 RDF25SF r it h Jltm RS17 HL 82 S3 90 Metal Oxide Film Resistor 390f1 2P lNit Jltm VR501 HT 41 0 1 SO Solid Variable Resistor B4 7Kf1 SR29R v I I VR IC501 iG 04 0 8 00 Triger IC I ti jC D501 0502 505 0506 0507 iH 00 0 8 80 Bridge Diode iH 00 00 60 Diode iF 00 1940 Zener Diode SIWB 10D 4 HZ 24 i f t 1 7 Y i f t I I I 9 f I SCR 501 50 1 iH 00 0 9 00 Triae SMORSGO SA ...

Page 27: ...2 40 TR nz Idli f lgtunern IOR 1ll 1 IOtT _232OIE MI IRl TRIM I I 2SC2705 I 10 Tl I _ a e C L TRSII TAU 8 ISO M_ 1 I n _ ISCIIIO I k IO VI r f S z I u n i _ ae I L l 18147 1 I Cons Int arnll t I 1 vari DtiQnl Disch rlliliV J J h l I i a l 2 d n I u ih 471 SS 4 tl 4 D C a e I N sr Ir w Mv r laOS 5 r 1 zl 4nll f llelD06 tU4n ITR lt I l zsc lII l 3 S441 _ _ I d J I NM I 10 5 1I U 111 It H 1 fs r 1 l ...

Page 28: ... 11 ras il I _I I _ _ i i 1 1 U II J I I tOIa I 10 1 I I l J L ii I _ er c I I I Utl a Ju aJal alulafilll0f IP _ I t I fi 7 TI r I Ilt _ I U C I r iJ if I I I I I 1 1 I I I I i i I I u 1 li i ii I r ri I I 1 1 Irr 1 Il _ 4 It I aa _ _ CI i ...

Page 29: ...line I Oll 3 To eheck the Tri c tonfi m tbe wevetorm 8 I both lides 0 R515 3P 1 2 k ohms Tht wav forms should match tbe di g am r r J I i r I T B I I I I I I I I I I I I I I I L I I I 1 I I I ilr I iI I I r I li lh 11 i I I I n I I T I I I I 1 I I I iEfit l d f 110 j r I iU 2 Z i I I 1 0 I eJ I I H I I lelOI I TATaaHP I 1 1 5 I L D f 11 1 I L _ sw I c I E 1 1 I I r I 0 l 0 lAU C I I I I I I I I I ...

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