Yamaha R-70 Service Manual Download | Manualshive

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Summary of Contents for R-70

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Page 2: ...0Hz OdB 1kHz OdB 4kHz 3dB 16kHz 6d8 MAX 60Hz OdB 250Hz OdB lkHz ldB 4kHz 7dB 16kHz 11dB HIGH FILTER Preset 60Hz 1dB 250Hz 1dB 1kHz OdB 4kHz 5d8 16kHz 6dB MAX 60Hz 1dB 250Hz 1dB 1kHz 1d8 4kHz 8d8 1 6 k H_z_ _ 11dBc ___ ____ Output Level Impedance Fixed FM 100 mod 1kHz FM 40kHz mod AM 30 mod 400Hz FM SECTION 500mV 5kn 380mV 5kn G 150mV 5kn Tuning Range 87 5 to 108 0MHz 50dB Quieting Sensitivity IHF ...

Page 3: ... SHIELDED LEAD B SEPARATED AND USED AS CLIP WHEN MEASURING CURRENTS FROM ONE PART OF APPLIANCE TO ANOTHER Confirm that the leakage current is not more than 0 5mA AC REAR PANEL U S A Canadian models General model R 70M R 70 R 70M LEAKAGE CURRENT MEASUREMENT CIRCUITS Jv I GR S1 GROUNDING OPEN _cNSULATl G L_ TABLE GROUND SUPPLY CONDUCTOR B Appliance intended for connection to a 120 volt power supply ...

Page 4: ...50Y i POWER IC C STK3061 y 0 PRE DRIVE 3 0 MPX IC LA37H E F IF IC µPC57 BOARD 3 4B MAIN CIRCU IT numbered f disassembly as ts in order o tom cover RES Remove par the top and bot OC EDU b removing BLY PR unit is possible y DISASSEM I ost circuit boards in this ng Heat Sink of am Remov1 I C ement of the parts 4 p pe Lock i Rep a 11 i _J Top Cover j I CD Removing p nel m 3 Cover l ililll h i llllllll...

Page 5: ... 3 Do not forget to keep the bottom cover on 1 FM TUNER SECTION OSC Oscilloscope DIST M Distortion meter FC Frequency counter ACVM AC volt meter Remark No load PHONO selector set MM PHONO selector set MC Use 200Hz to 15kHz bandpass filter to measure the REC OUT Set the switches to the following positions On step 1 and 2 connect the auxiliary center meter Ji00036 or similar in series with the resis...

Page 6: ...justment method Rating or Remarks locations standard VR103 CD Connect resistor 19kHz Confirm that VCO 2 2Mn between TP4 10Hz stereo indi 19M and TP5 12 cator Iights and force the set in up Stereo indica stereo mode After adjust tor Adjust so that VCO ing remove frequency is at 19kHz the FC and the 2 2Mn resistor T101 Same as step 3 Less than ST DIST 48dB G model only Less than 33dB Confirm that th...

Page 7: ...rige the PRE SET P2 at AM SG fre Press the Memory quency button Confirm that the fre t quency memorized is The Memory indicator recalled lights about 3 seconds t Press the PRESET P1 during the Memory indicator lights t The PRESET LED of P1 lights Press the AM button and tuned the 1080kHz with AUTO seach Press the Memory button t The Memory indicator lights and the PRESET LED of P1 flashes t Press ...

Page 8: ...ircuit board 1 2 Main circuit board 2 5 _ 5 5 Main C Board 3 3 Main C Board 5 TR 2 From Main C Board I 4 From Main C Board I Main C Board 2 VOLUME BALANCE 5 PHONES _ __ From Main C Board I fu i I o 1I From Main C Board I SPATIAL EXPANDER 10 5 0 Main C Board 4 6 7 D ...

Page 9: ...y C Board From Tuner C Board I E F To Main C Board 3 From Tuner C Board 2 G H R 70 R 70M z 0 O c i 11 CD O 0 fT1 I 0 c t t l di O 0 fT1 0 c t jij N JTR428lw i J ai Jt TR l J r t J J I N ij II fl t 1 _ J 2 wa J _ _ l ul l To Main C Board 2 From Power Transformer CD O l i u l The following parts and values differ from each model so refer to the corresponding column C401 406 C513 514 C529 531 533 535...

Page 10: ...Y STEP I 1 i T t J i 1 t 1 r FM 50kHz IOOkHz 1 I t n AM 9kH IOkH H 1 tt_ __ To Main C Board I The following parts and values differ from each model so refer to the corresponding column G C203 204 b _ I To Key C Board T103 J r M I 1 To Tuner C Board 2 PiN CONNECTION DIAGRAM OF TRANSISTORS DIODS AND ICS 25A777 25A970 GR BL 25A999 E F 25A 1127 R 5 T 25C1923 25C2320 E F 2 SC2634 R 5 Tl 250786 Q R 5l 2...

Page 11: ... PRESENCE HIGH TONE 2 I FILlER I D f IT DfllVEfl _____ SUBSONIC FlLTER 16 412 Reh STABIUZEO POWER SUl l LY STABILIZED POWER SUl l LY IPC LIMITER l l AMP t B DC PROTl CT10N THERMAL PROTECTION H SPEAKERS lo o Io i lo B M r SPAT AL EXPANDER r il1 n 4 i 0 15 VO SP U c 1 44 IC413 STK3061Y This schematic diagram 1s for U S and Canadian models The following parts and values differ from each model so refe...

Page 12: ... II 3 3 F FY ooj 01 90 Trimmer Cap 5P GE j 10 02 80 FM Discriminator Coil GE j 10 06 50 FM IFT Coil l8 New Parts frjlSf H WARNING R 70 R 70M UL Standard 1270 requires that components marked h be replaced with parts having specifications equal to those originally installed Carbon resistors of this receiver are W There is no discription about them in this parts list Use the Part No HJ350000or equiva...

Page 13: ...Q II II R2aS 2a6 G HF j as j sa 20 II a20Q II II R172 HF as 61 00 II 1kQ II II R147 1S0 277 HF i aSi 61 20 II 1 2kQ II II R14S H _ F j as j 61 so II 1 SkQ II II R1 a6 2SS 2S6 301 304 HF j as 61 ao Carbon Resistor 1 akQ II R1a2 HF i as 62 20 II 2 2kQ II II R2S7 2S7 2Sa HF j as 63 30 II 3 3kQ II II R24S 26a 270 2aO HF as j 64 10 II 4 7kQ II II rn1 1 27 167 170 196 253 HF as 65 60 II 5 6kQ II II R30S...

Page 14: ... II 0105 106 iG ooi 13 90 IC NJM4558DV I c IC103 iG i02 92 20 II LA3380 II IC104 iG j 03j 45j 00 II 11PC577H E F II IC101 102 iG i 04 14 00 II M54459L II IC105 iG j 04j 91 j 00 II LC7210 II IC107 iG lo8j 53j oo II LC6502C 604 II IC106 iG 09 21 ioo II M5219L II IC107 KA j 4oj 09j 40 Slide Switch SSB 022 A 7 I A I 7 SW101 R LR KA i 90 j 51 j 80 Remote Switch SSR2635 IJ A I 7 SW102 PH ONO LB j 20j 24...

Page 15: ...0 033 11F 50V II C465 466 474 UA 25 51 00 II 0 1 11F 50V II C417 418 483 4a6 UA 25 51 50 II 0 15r1F 50V II C433 436 FA 15 54 70 II 0 47 11F 50V II C415 416 uw 91j74 10 Electrolytic Cap 47 11F 6 3V T J C498 UW 91 81 00 II 100r1F 6 3V II C455 456 489 497 uwj 91 84 10 II 47011F 6 3V II C495 uw 82 92 20 II 2200 11F 10V II C494 UW 92 72 20 II 22µF 10V II C492 uw 93 81 00 II 100 11F 16V II C487 488 uwj ...

Page 16: ... EXPANDER HS i 31 i 2oiao Variable Resistor iiJ ti tt ft VR401 VOLUME BALANCE HW S9 i 34i 70 Fuse Resistor 4 7 Q 1 4W I l tt FR401 403 HW S9i S1 i 00 II 100 Q 1 4W II FR404 407 iA 07 77 00 Transistor 2SA777 7 A TR405 407 iA i09 i99 i10 II 2SA999 E F II TR408 4 1 9 Inter 423 428 iA i11 i 21 ioo II 2SA1127 R S T II 11 changeable iB os o1 00 II 28507 II TR432 iC i o9ia2 i oo II 2SC9a2 II TR433 iC i1s...

Page 17: ... Relay DC12V 1 RY401 II II II LB j20 j22 jlo Pin Jack 2P I 1 7 PJ401 4P 11 PJ402 403 LB j30 17 50 Headphone Jack t 1 7 JK401 LA OO 23 40 Wrapping Terminal P 7 5 5P i Type LA oo 44 jao Speaker Terminal SP II SP II LB 91 20 50 Short Plug 5P i Type LB 92 11 oo Connector Plug 10P i Type LB 92 11 10 1 11P i Type II BA OS 71 30 Radiation Block CB jo6 as so Plastic Rivet BA oa 40 oo Heat Sink BB 06 83 70...

Page 18: ...c Cap 2 2µF 50V J iF joojooj40 Diode 1S1555 iA jo9j37joo Transistor 2SA937 7 A iG j04j68j00 IC BA6104 c II M54527P II Replaced by IC LB1274 iG j04j94 j OO II LB1274 II Interchangeable iG j03j 11 jOO II M54516P II iX jeoj 14j10 II M54560P II iF j00j44i 10 Frequency Display LC 205MK N jJ Jl ft ff K iF jOOj45j40 LED LED SLR 34URC3H L E D iF i00 i42 j70 II LED SLR 55URC3H II iF jOOj45j50 II Green SLR ...

Page 19: ...A B c D E R 70 R 70M EXPLODED VIEW 2 3 4 5 6 7 18 ...

Page 20: ... 1 7 7 Jv 177 7 11 7 7 II If If ti I ijJ ff i I 7 fJ tt If t i If A c 1 v ti ii i II II II If Inter If Changeable 7 7 7 7 1 7 1 1 j ti 1 PACK 1 lj PACK If PACK 111 J l PACK 1 1 PACK 7 i T Y If If If t y If If 7 y i 7 1 17 POWER II If t j i i 7 if fJ IJ f 1y i 1 1 f PHONO Selector t i If II II II II II If R 70 R 70M R 70 R 70M Common Markets Model Ref Part No Description Remarks Common Markets No M...

Page 21: ... SPCC SD t 0 8 A 8 ex j6ojo1 joo Cushion t6 y 9 ex j 6ojo1j10 Sub Panel if 7 10 CB j 61j73 j 60 Button f 11 CB j 61 j 73 i70 Push Button 7 y y 12 AX j 6oj ooj 00 Spring Button SUS304 CSP H f 13 CB j 61j74j 70 Button f 14 CB i61 i74 j 60 II 15 CB j61 j15j8o II 16 CB j 61j75j 40 II 17 CBj61j75j50 fl 18 CB j 61 j 75 j 60 fl Ji t I 1 y 1 11 l 7 Cl y y 3 Ji a f II II fl fl fl 19 EA j 02j 60j 66 Pan Hea...

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