SERVICE MANUAL
Contents
1. 42 00 00 CB 07 41 90 A ephemera 72 2 se 42 00 00 i L 00 05 10 Mica Base AC 243 TANNA q re gt Q3 O 20 O 0 a T O o Mor gI O x w ce o 2 gt 0 3 5 42 00 00 EK 09 50 50 Bind Head Tap 3x 12 ZMC2 Y BY EY TIT bY Transistor 25A968 0 Y ST AD B tyte TR329 TR330 J d De ne SJ L 25C2238 O Y TR327 TR328 29 m EK 03 00 30 pang Sere 2 2 262 Ewa Kay eva asas 0 32 00 00 NB 09 89 20 Radiator R Unit 5 yf amp 4 2 iD084500 6 250845 R O TR332 4 3 42 00 00 i L 00 05 10 Mica Base AC 243 x 4 4 32 00 00 8 8 07 94 50 Heat Sink 7945 HAR 00 09 50 50 Bag 3X 12 2MC2 Y BRAY EI 7754 MAD OMNE X 5 32 00 00 AA 60 35 90 Rear Panel 2 2 U C 32 oo oo AA 60 35 80 x AA 60 36 00 x 32 00 00 AA 60 36 10 42 00 00 CB 07 27 50 Cord Stopper SR 4N 4 42 00 00 MG 00 08 90 Power Cord Black 2m13A125V x gt lt O 95 H M Ae he n M M M M a _ FF yst 7 wa FF 42 00 00 MG 00 07 80 6A 250V MG 00 09 20 Gray 2 5m 7 5A 250V 42 00 00 MG 00 0 Bl2. UT gm o6 f 100P OLX 3 zm H s 6 PRA 22 8 3 1C501 Gode Omen 3 i 804080 J ew LLL 0 S lt 1G04080 sr 3 _ _ x IMA m LL n lt LLL 0 1 630 co uU Hn DURUM 1 I 1 on gab iE LARD CEARA bu 0 ul _ LE T GY T2 hic E bell isl mn Reference voltage line een gm SIC 5 i Tues 7 e cnm cog 9m Bi n UN SWITCHED SWITCHED CONTROL CIRCUIT 1 oM N ard MEM ote 1 When observing signal waveforms on Note 2 Ensure to check voltages on the control nges made according to destination the control circuit boards avoid physical circuit with reference tn shan waga ri a ef D3 gt KO 250845 0 9 1 ml ool e 7 i I Dj 594 2 AP 2SA96 8 o Y LE T 1 sig ps 258 5 1 12 gt gt eL ya PaB gt SFS 250845 O 22 28 19 0 R364 AN o O N 4 t i c UC 05 CH C3 N fose EAS mises o9 3 a3rs D326 8e I 70 4 feen pa EEG T 4 FN a ce M ELE o 2 NE S T7 Wu Ta 4 ot e EK iC T2 G TI x Q Ci I 8 1 2 5 iGO4080 3 CH 14 xO 1 TR304 8 go 1 e 2 d 4 3 4 a Ei tara aman a
3. 00 PN TUTE Tean C3 1 d Q zi s e UL r2 x 2302 I E 3 I PIEJ i I Oiz romney 3 z 5 x Bio l ORE NIS Ale f l 29 3 1 g t BI d IP PSI Om d dcs j 4 ii el 5 ol I el 5 l Zi 3 S a gis 0 VIE gt M ui 5 gt HIIGH FILTIER ue Ag Ak 2588 Meltege x variation 4 8 Og circu 5 R254 4 A941 GR 470 R252 urej bi R204 8 0 50 VIR C202 2 e H S R202 n R29 4 7 25 O 3 0 1 C4 SW201 2 aq m Q j e 4 JMM R23 R235 C230 acs 3 BEEN 2SC263l QR S 20 n Yio MAIN DIRECT swa _ DISC we Swan win t 0 1 0 qd El s O asy d Wd ou CONTROL 2 14 5 80 X 3 DISC POWER MAIN DIRECT PL203 PL202 PL201 f 1 AI s M h bos o m sst nd di um a 6 D203 5204 SLB 26UUIN X2 CIRCUIT cur i al model I WH TII ul 1 fe i aq RE lt ST T L p C2 TR501 260 093 T Pa U S A Mode en r vu ls RE C4 1I TLP50 8 BL VI X X Or Aw si al 5 i Canadien Modai D Z gt bak akak 0c li 2 NS Spi ah NCC ait pa IH 1 5 3 ve irum 4 H t l 1 aE 58 9m Lg 8i a8
4. Connector i 1 Lewes t um ee a EES x 8200 00 MZ 07 93 70 Connector Main C Board Ass y A4vas227 Asy O x 82 00 00 TX 90 07 80 Hexagonal Wrench xal 1 2 x New Part Fr 38 48
5. 151555 555 2lsA995 Sis AATR328 i 8 3 8 250209860 lt 4 il Xx D34 1 3 ut TR 324 i d as WO6C e e 2 2220 d ZPOZ O Y a i a Pes 00 5 X2 ser iu las a Ra bani AR LATA V wasanta Loewe TONE CONTROL 4 Note To prevent the transformer from over heating do not apply a voltmeter lead sa the emitter of 18 340 in the main rn 22 H 0 59 2 1134 6 an re see ih za mmu N 2SA999 E F o qm f x I O O Y E F 5 mn 2962631 QRS 0 i 28 Vo BUE D i RESIST R O 0 3 a ae i BHstening level YE RE 3 CARBON RES p indicator drive cirqui METAL OXIDE SON METALIZED 20111 0 1 N 3 4 METAL PLAT 8 3 T YE RE FIRE PROOE i 2 4 SEMI VARIAI 3 I l 8406 R407 100KC ml 3 CEMENT MOLI _ 120K z 4 i 1 LISTEING LEVEL 3 3 MONITOR E m 75CR502 j T T 0 CAPACITOR SMIGDGM L 1 j UT GET 4 ui CERAMIC C 2 E MYLAR CAP i BL 1 GY 4 T N 3 e 8 POLYSTYREN E 4 PAPER CAP D205 3 P S CAPACIT E lt 3 i 1 Act A N 4 SLR 34UR 4 p TE 7 1 es TRA SETA i ONTROL CIRCUIT 1 n the control Ec EE HE Ti 8 MAIN 2 0 EM oe ee QUU xa mda mS 5 R426 Pow
6. 0 3 dB Input Sensitivity Impedance PhonoMM 2 5 mV 47 k ohms PhonoMC 2501 100 ohms Aux Tape Tuner 150 mV 47 kohms TONE AMP HIGH MODE FILTER MAIN DIRECT STEREO EE MONO BASS TREBLE LISTENING LEVEL MONITOR PROTECTION BR BL 52 E 7 BL Sav CONSTANT BR Maximum Input Level 1 kHz PhonoMM 180 mV RMS PhonoMC 18 mV RMS Tone Control Characteristics Batic ace 10 dB at 20 H2 TeDe cuam 6 4s ate Beas 10 dB at 20 kHz Turnover Frequencies Bass 500 Hz Treble 3 5 kHz Output Level Impedance Rec Out os by xar x vs 150 mV 550 ohms Signal to Noise Ratio IHF A Network Input Shorted Phono MM 10 mV 98 dB Phono MC 0 76 d8 Aux Tape Tuner 150 mV 103 8 Residual Noise IHF A Network 165 Filter Characteristics Channel Separation 1 kHz vol 30 dB Shorted Tuner to SpOut 70 dB Phono MM to Sp Out 70 dB Phono MC to Sp Out 70 dB Continuous Loudness Control Level Related Equalization Max Attenuation 20 dB at 1 kHz PURE DC POWER AMP A 760 HEAD PHONE aw S 0 WITCH PROTECTION Headphone Output 6 5 mW 8 ohms 0 01 THO Semiconductors 47 Transistors 4 ICs 8 FETs 54 Diodes 3 LEDs Power Supplies U
7. 9 3 2 al gi wy gt GH 1 A I WwW x Zi I o 91x O cae S9 E i Oi 4 3 6 wa 5 4 I NO l 9 FEN x es d 1 b cns 2288530 33K sued 4 7K R220 560P UN SWITCHED SWITCHED ote 1 When observing signal waveforms on the control circuit boards avoid physical contact on the oscilloscope body since a hazardeous voltage might develop on it Do not connect the unit to the earth ground w 3 gt 4 21 2 ag O gt 3 eg j Ei A din e zi a PAAS ma TONE CONTROL 2 Y 2SC263l QR S 9 S Loto n Vo pr 14 5V80 A X 3 x 4 B DISC POWER MAIN DIRECT ii r PL203 PL202 PL201 NG ine D I gE T INA 5 RE ITR501 4 c l gt I DAE RE Vs ESI 1155018 BL VI LA A 9 5 02 gt i I TRO SMIGDGM L i i 2 ov jet Icsol 80 lt WH CO 1604080 9 X 5 1 z THERMAL I i IFUSE 1 5 9 l l o l l SIR I i NA 2 a ale ang R ci BR 4 I Reference voltage line Sy CT TI M 3 Note 2 Ensure to check voltages on the control circuit with reference to the reference voltage line Note 3 Check the triac integrity by observing
8. Removal a Remove the top cover step 1 b Disconnect all leads from the control C board c Remove screw Q in Photo 7 then remove the control C Board from board holders A and B Control boards 1 and 2 can now be re moved d Remove screws 2 2x 5 in Photo 7 to remove the cover transformer e Remove screws o x 4 in Photo 8 to remove the power transformer Photo 7 t i t E A i 1 uUi I rears ogi 2 1 ETT 1 Photo 8 A 760 E ADJUSTMENT Power Supply voltage U S A and Canadian AC 120V Prior To Adjustment General AC 115V Idle the unit for about 5 minutes before adjustment North European AC 220V Australia and British AC 240V Se HY Measurin Step Condition Adjustment Test Point Specification TAM nstrumen Idling cur Main board 1 5 i Pi TP rent adjust iive ai IN VR303 L ch E 2b 10 5mV d volt adjustment VR304 R ch LS meter Offset Main board 1 V E mini Ps TP voltage O VR301 L ch i i 0 10mV Same as above adjustment VR302 R ch Main B d asia Main board 1 Control board P1 terminal Digital volt 8 9 VR305 Chassis earth meter adjustment Across P and TP3 on the control board If the voltage is VOLUME mini outside the specification adjust VR501 on the control mum position board and VR305 on the main board alternately until the gt TO Same as above non load t B voltage and the
9. x 5 7 815 2SA673A S d 2 H x 9 NAH GC m ms s 0v pn ae us 1 L m Listening level YE RE WH indicator drive circ 0 m 3 E 1 VR306 R406 R4O7 6 Ut 120K 1 z LISTEING LEVEL MONITOR _ o MAIN i 151555X2 kapas UM de fy fe ae lal A hit i b ME SLEG Na Ma oba 3 d Wu on mandi B 2SA733A 2SA912 2SA941 2SA949 2SA999 2SC458 25 5 2SC2229 2SC2240 2 600 8 2 4 2SC 1624 eSCi983 e EC E 2668 258649 2SC2238 2SD669 0 6 SESGO 260 25 5 bb wu N gt gt o Oo 25 5 2 5 NJM4558DY NJM4559D TLP508 PART NAME CARBON RESISTOR a METAL OXIDE FILM RESISTOR METALIZED FILM RESISTOR METAL PLATE RESISTOR CEMENT MOLDED RESISTOR H CAPACITOR 06 920 PART NAME 1 AR 25603 l Au ad har eA su ARE su 2 Y Y R 253010 688 vol ioP ioP Y Y 1301 C ov 83 f 3 R07 E gt to BLA ABL i 6 L l I ur e E ait one ees 3 B pe An 2SC2238 250669 EL m J ke BR I R 5i 1 3 al SPEAKER B at wi 3 9K TR349 350 2SC2320 E F 39 32 4 T 2SKI50 u N o A N l 2 Sio N 9 z oT 2SB755 NJM4558DY g PE 2SD84
10. 1 5 CONTROL CIRCUIT 2 FUNCTION Sad LA RRR aapa a aaa a MET ETT TI sss m 1 UU 51555 ure current llar PHONO Phono equalizer amplifier 5 8 servo i REC 2 PB 1 PB 2 REC 1 AUX TUNER 41 i pito 25A999 E F g amplifier d PJ02 1 PHO3 P1102 2 P 102 3 1103 2 P3103 3 0311 D31 OL 9 OH Q4 Q4 L ry X i Y GR BLI ove 1 av 1 1 AUX a i 6107 9 m M 0 0056 0 001 K K 1 x oioc H 2 560K F 4 A hiis bes locos hi i Q3 Sty zi TR349 1 204 R317 2SA999 IE F 0 ss sm nine aes ake D ROT ows ianh kaz o e a 48 Pv ai m 0 el 8 ae RE 4L i 1 8 3 2 K D345 2233 30K TRI X2 2 151555 R334 C108 09 4 T 3 3 9 K 0 0056 0 001 K 4 OL 6 Of 21 1 8 i 1 o 9 1 3 2 1 N 1 d 5 gt 1 d o Tm 1 LO 5 9 9 T E o 1 i 4 O T 2 B1 amp 81 gt 2 mm am m Dt RE WH oul On BAYA Tone amplifier R217 R219 1 OFF 560p 33K d IE STEREO Idling current adjustment R b w 120K T R SIE 112103 4
11. 94 60 Knob SW 5 vs 32 00 00 BA 07 96 40 F 5 32 00 00 BA 07 95 70 Cover Transformer TELELE 42 00 00 CA 07 05 80 Isolation Plate iE BAR m 32 00 00 CB 09 97 40 Cover Slit 32 32 00 00 68 09 98 30 Support P C P CtH 2 F 34 32 00 00 0 3 132100100 68 09 99 10 Rubber Antivibration Bate A 00 00 CB 60 05 70 Bush JF Fv 00 09 98 Rubber Antivibration u Baik 3 36 0 CB 09 86 00 Leg Bj Lm 42 00 00 08605 5 HE MM amp K O x C3 x x BB 35 x 37 Packing Cover INT ING KY x 38 Damper 4 MERE E p x Tape Antivibration 1 52x 10x110 nd 40 42 00 03 00 80 Bind Head Screw 3x6 ZMC2 Y RNY EDAS O x 41 42 00 00 0 4x75 ar EN 33 00 10 Ends ew So gt ES y Type 2 3 8 ZMC2 Y 44 42 00 00 0 45 42 00 00 0 3x12 7 46 42 00 00 EK 93 00 10 Tapping Screw 3 8 10 ZMC2 Y 47 Slide Switch Voltage Selector X34 Ps sa Oi x 51 42 00 00 08 60 29 20 Spacer Switch ES TE ae x 32 00 00 MZ 7 90 30 Connector Tone C Board Ass y B RON EMEN NE 2 5 2 7 FE 2 5 T7277 Pak ajan a 2 42 00 00 BB 00 44 30 215 16 SHF 001T OBCS 42 00 00 LB 20 13 80 Housing 2 5 Pitch H2P SHF 42 00 00 LB 30 07 20 2 5 H3P SHF
12. by sibi DM A oxi NY siding it covwar oi tio airov Photo 1 2 Bottom Cover Removal Turn the unit to place it Remove the nine bottm cover retaining screws in Photo 2 and remove the bottom cover d m shulla E A DH SUE IE 3 Front Panel Removal a Remove the top cover step 1 b Remove the bottom cover step 2 c Use an M 1 5 hexagon wrench to loosen the retaining screws SPEAKER REC OUT and INPUT switchs then pull out these knobs d Pull out the illuminating lamps from the POWER MAIN DIRECT and DISC pushswitches lamp holders carefuly to avoid damaging the lamp leads e Disconnect the MM and MC indicator lamps lead at the connectors f Remove screws 1 and 2 shown in Photo 3 The front panel removed by slowly pulling it in the foreard direction Photo 3 A 760 4 Rear Panel Removal a Remove the top cover step 1 b Remove the bottom cover step 2 c Disconnect the power cord at the AC OUT LETS The rear panel removed by taking off Screws 1 27 shown in Photo 4 EGE EN 2 on 7 i E 5 S i MMS dn sw 64 raa IPT A eee eet heh te OVER M oh 2 ym md Am oa Photo 4 5 Function C Board Removal a Remove the top cover step 1 b Disconnect all leads and connectors from the function C board then remove the flexible wires from each on board switch using a small stand
13. voltage across P1 and TP3 are within the specification Photo coupler current check U S A and Canadian General 47 5 V N European Australia British 47 0 5 ADJUSTING POINTS Main C Board B voltage check points collector heat sink Idling current adjustments Off set voltage adjustments 303 Control C Board 1 Photo coupler current check Ground B voltage check point collector heat sink VRSOI c Control C Board 2 E am 9 BLOCK DIAGRAM FET ICL EQ REC OUT INPUT SWITCH SWITCH PHONO SWITCH TUNER gt AUX gt TAPE PBI gt TAPE PB 2 RECI 4 RECE 4 POWER SWITCH OPTICAL FEED BACK Mi SPECIFICATIONS Minimum RMS Output Power 8 ohms 20 to 20 000H2 0 01 THD 3 e leat tb 80 W BOW DINY SEDR 100 W 100 W Total Harmonic Distortion 20 to 20 000 Hz Phono MM to Rec Out 5 V output bled oaks 0 00396 Phono MC to Rec Out 5 V output P PEU 0 006 Aux Tape Tuner to Sp Out 40 W A oS 0 005 IM Distortion Ratio 60 Hz 7 kHz 4 1 Aux Tape Tuner to Sp Out 8 ohms 40W 0 002 8 ohms 1W 0 01 Power Bandwidth 8 ohms 40 W 0 02 THD DET 10 to 50 000 Hz Damping Factor 8 ohms 1 kHz Better than 55 Frequency Response Aux Tape Tuner to Sp Out B ohms 25 20 to 20 000 Hz 9 dB RIAA Deviation PhonoMM 0 2 dB Phono MC
14. 14 SERVICE MANUAL gi FRONT PANEL Q AMAHA MATUR AL SOUNO STEPPE AMPLIFIER A PE MS PRONES ed 0 t JR a r a H x o Q O 15 D POWER power pushswitch HIGH FILTER high filter in out pushswitch LISTENING LEVEL MONITOR indicator 7 LOUDNESS loudness control MAIN DIRECT tone amp bypass pushwitch D BALANCE balance control Q DISC phono disc selector pushswitch DB MODE mode selector pushswitch VOLUME volume control DPHONO phono input selectors indicators MM 9 SPEAKER speaker selector switch MC PHONES headphone jack D REC OUT recording output selector switch BASS bass control D INPUT input selector Q TREBLE treble control kona B CONTENTS REAR PANEL INTERNAL VIEW jns iua ja eod vr Med Ys i Oe LU E 1 DISA SEMBL eon aaa a a a a ag etn etnies 2 EAE ane 2 ADJUSTMENT ADJUSTING POINTS 4 BLOCK DIAGRAM SPECIFICATIONS PET RE TTA 5 E gut WI ING azurea dite ound tice shua hasqa Tu 0000001 aya Ka ee 6 CONTROL C BOARD SCHEMATIC DIAGRAM General model 7 CONTROL C BOARD SCHEMATIC DIAGRAM British Australian North European model 8 ELSE E E at En toti es ud tod E 9 SCHEMATIC DIAGRAM YAMAHA NIPPON GAKKI CO LTO
15. 5 yp IN 2SA999 E F Th302 m 1 1 0 856 MAIN S1L e D 0 wn o C3 4 3 i i H z MONO I 10 2 Ihe SE F a R251 OFF 4 220 2 00 701 4 7 25 2 l I V VIL R253 47 1 4 i 2s II ME J OFF 1 LE SR ial 1 1 els ON 1 i ees 1 i 928 An ne Bao 14 C217 al Ole i i e el l 8 1 i me e al x 2 gi tA 2 SIEM 0312 3 21 33 6 3 LIT I l ay S1 A237 I ox eh As al l i alel Gl 4 7K i 9 N e 8 l 5 l Sa 2 N 92 1 A VIE OFF E 3 E J _ 0314 ajx Q l 2 ajo 5 Sel era Sio l ee 5 lt gt 08 sl 9 e gi s aig ION gi TS FEROS RI Ces SE sP E amp EJ al al I xl S s S2E M vi N 5 I oom 0 8 e 8 1 8 2 2 4 22 ign z 2 2 LE 8 etis s R R30 d 83081 aso GR BL TREE i rE MAIN DIRECT LIS 1 25C 9 E OFF TONE CONTROL 3 1 1 GRBU DS 4 3 3 STEREO ON 3 ANE cu O A _ 7 TR304 gt 60 i I i 3 T TRA MONO bo I i 9 40 Rasi OFF L 11 3 AC A A AT al 470 TL E Hoz deb E E LILE OFF i 2Eae s T 831 8 d
16. 5 NJM4559D golos I SA SS aza D326 esl s1555 a O 7 DE O O gt anan a Jaman an aan an aan N 5 N Qo da O O O O O O P Idling current adjustment R 2 5 iGO4080 R TP 3 o EP s 50 vq Ja AA TR232 aay 250845 O P 0 n All DIODE ZT a Z Nen Tew ian 2 a nd 5 00 a Guil E E Protection circuii D347 4 WO6C i 1 s Z lt D B 4D4841 SLR 34UR 3 SLB 26UUIN 5 zu md A x SMI l 01624 TR339 X sss a ajann ag 0 2502631 Q R S 2SA673A E RE 27 3 T 25 2225 n vaa x re 3 TaLe tue Bn N i amp 2Y d Irons I 1 RESIST R A 5 NE REMARKS PART NAME a Listening level BE ye RE WH 4 CARBON RESISTOR 1 indicator dave a sa x METAL OXIDE FILM RESISTOR METALEED FILM RESISTOR i TE _ 1 METAL PLATE RESISTOR O ERO 2 gt a FIRE PROOE CARBON RESISTOR 5 I 515 9 e 1 1 e e t I Q Q se LABA C jee a h 58 si y 35 J 4 2 z a 2 le 228015 ei eis 3 S o o el af 1 ka 1 o I a I e I ei i 8 8I
17. HAMAMATSU JAPAN 80 11 2 42K KT lt gt Prited in Japan A 760 REAR PANEL ee DO NOT EXPOSE THIS APPLIANCE YAMAHA See no CAUTION DO NOT REMOVE THESE SCREWS SEE BOTTOM CAUTION 4 780 ATTENTION NE PAS ENLEVER LES VIS LIRE LES INSTRUCTIONS AU DESSOUS DE E 0 350 8B50vA 60w L APPAREIL eee 2 NIPPON GAKKI CO LTD l HAZ ECE Fi ARAS WARNING TO PREVENT FIRE OR SHOCK HAZARD TO RAIN OR MOISTURE Y GND ground terminal PHONO phono input jacks TUNER tuner input jacks AUX auxiliary input jacks B INTERNAL VIEW Top View Q AC outlet Power cord Power transformer housing power transformer GA63580 Main C board 3 NA07490 3 Heat sink Power transistor s Main C board 1 NA07490 1 Function C board NA07486 Tone control C board 3 NA07488 3 Tone control C board 2 NA07488 2 1 l TAPE 1 2 Tape 1 2 record playback jacks 9 SPEAKER speaker terminals A B AC OUTLETS switched and unswitched auxiliary outlets Power cord D DISC switch Phono indicator LED MAIN DIRECT switch D Tone control C board 1 NAO7488 1 p Main C board 4 NA07490 4 Main C board 2 NA07490 2 D Power pushswitch D Control C board 1 NAO7495 1 D Control C board 2 NA07495 2 WI DISASSEMBLY 1 Top Cover Removal Remove screws 1 and 2 in Photo 1 from the both sides of the unit The top cover removed
18. MOGLICH DA KOPIE VON KOPIE A 760 Hi CONTROL C BOARD SCHEMATIC DIAGRAM General model ee em CREO mL al s nanan w ED P2 i TR 50 PI 1 GY TLPSOBIBL Vv f r l SCR502 ACIGRGM L E 50 5 x NT i Pel l 3 oo D D D x u 5 mu x x x 45 4 E 5 3 2 gt oc ac NI E ro es ro POWER we 1050 ante Sw 50 wn u 47 2 i 54 ix a Be x yp 3 v CSOs I a oc Q 2 wl 4 0 i M 4 2 qu CONTROL 9 oS CIRCUIT 3 a c CIRCUIT 3 FOO 5 2500 CONTROL CIRCUIT 1 CONTROL CIRCUIT 2 CONTROL A 760 WE CONTROL C BOARD SCHEMATIC DIAGRAM British Australian North European models TP 3 SCRSO02 ACIGDGM 1L c x x H 8 a kia 1 o NENG z uU Q C509 g 2 a 5 0 017250 c elm a z x x N m wn z i cn 0505 5 s v ro e 1004x2 P Uu POWER a 8 35 S 1C501 vu E BE 3E c i xi l 9 85 1604080 R513 Qo lt BOK 6 T2 o9 N O o I C508 2 Em d g 5 x 2 O Q 01 250 TP 8 o cNi Ps 4 3 N OME A CONTROL R50 ELOX 9 5 8 ofS 2 e CIRCUIT 3 is dps zs Ya 8 5 ER AE E esee 6 o 44 4 F59 T6 34 CONTROL CIRCUIT
19. S and Canada 120 V 60 Hz l sra eos 110 120 V 220 240 V 50 60 Hz Northern Europe 220 V 50 Hz Britain and Australia 240 V 50 Hz Power Consumption U S and Canada 350 W 850 VA General sea sos y 350 W Britain Australia and North European 520 W Dimensions W xH x D 435 x 112 x 355 mm 17 1 8 x 4 7 16 x 14 3 8 Weight ng 9 1 kg 20 Ibs 7 oz Specifications subject to change without notice TA 301 and 302 are thermistors mn variaole resistors When r eplac ng SPEAKER nem up too long with a soldering adviseable to hold pem with a whiie soldering MAIN C Board 3 SPEAKER B NAO7491 3 U 7492 C NAOT493 A G B NAOT494 6 TA Yi euis switches ih UNSWITCHED Pe de Ud wQOW MAX TOTAL 200W MAX TOTAL EL 0 f NE T I iding current adjustment UG n TPA Sm C Across TP and TP2 LUO POWER TRANSFORMER oi GAB3I5S9 U 686385 0007 IH c d Thermal 1 0 fuse 9 5 6 p m s Mounting L501 4 laa tante ol more j then mE ECT POWER AMP m 2mm from the heat sink Gaerne ENR 2 5 Two glass tubes t Offset voltage adjustment i 6 mh D 10mV Across s TPS ang TPG Insulation tube Chee 8 Photo coupier q rrent check
20. ack 2m 6A 300 500 1 EXIENLI OOMEN mai O 42 00 00 EZ 00 14 00 Screw 3X 13 5 MFNi II Sems Flat Washer 11 42 00 00 EW 40 36 50 33 6 x 410 x t0 8 FNM3 38 X 12 32 00 00 NA 07 48 70 Function Circuit Board 32 00 00 NA 07 48 60 3 32 00 00 NAI 07 48 90 Tone Control Circuit Board pakot 32 00 00 NA 07 48 0 Ste ABS L 2 2 72 n 2 G O 0 ok 6 4 NA 07 49 10 Main Circuit Board 00 00 32 14 Xx New Part BB da A 760 Hs Part No Description 88 x 15 32 00 00 NA 07 60 80 Control Circuit Board 5 m F ee 16 0 17 42100 00 KA 90 16 40 Remote Rotary Switch 2 SW 18 42 00 00 19 42 00 00 KA 90 16 70 Remote Push Switch F Z a SW 20 32 00 00 AA 60 38 70 Top Cover by y 32 00 00 AA 60 36 20 Bottom Cover Hk 22 32 00 00 A4 60 36 50 Holder P C Board Yo pL 23 32 00 00 AA 60 41 90 Holder CS C SRI 24 32 00 00 AA 60 38 50 Tight Screw with Steps Bia 25 32 00 00 BA 07 33 80 VOL Knob VOL v 26 32 00 00 BA 07 72 80 6 Ed Po Holder Power Transformer 27 32 00 00 BA 07
21. ard screwdriver Figure 1 c Remove screws 3 13 shown in Photo 4 to remove the function C board 6 Tone Control C Boards 1 2 and 3 Main C Boards 2 and 4 and Control C Board 3 Removal a Remove the top and bottom covers and front panel from the unit see steps 1 2 and 3 b Remove the BASS TREBLE LOUDNESS BALANCE and VOLUME control knobs located on the front panel c Remove nut A and screws Q e 4 in Photo 5 to remove tone control C boards 2 and 3 d Remove screws and 6 and nuts d E in Photo 5 to remove tone control C board 1 Photo5 760 e f g Remove screws 7 and in photo 5 then pull out the LISTENING LEVEL MONITOR knob to remove main C board 4 Remove screws 9 and in Photo 5 to remove control C board 3 Remove nut E in Photo 5 then take off phone jack retention metal G in the arrow direction Main C board 2 can now be removed 7 Main C Board 1 and Heat Sink Removal a b c d Remove the top and bottom covers steps 1 and 2 Remove the function C board step 5 Remove the solder from all power transistors lead TR331 334 Remove screws 1 4 in Photo 6 to remove main C board 1 Remove screws 5 s in Photo 6 to remove the heat sink Before reinstalling the main C board check that transistors TR317 and TR318 are thermally coupled Power Transformer and Control C Boards 1 and 2
22. er amplifier j A R427 PHONES 2027012 JK301 502223 O Y i 7 oo SPEAKER A 2238 O Y 3 Ii B72 2 A AL ABER AL A 0 Q Q L nex TR331 j 9 ov 250845 0 8 E e x x TP 1 1 1 O E e i a gt AR ARE Zar ae ci 2 5 Sun j st APE ASL Y E 1 8 EC Y i amp ER 82 a D325 O enis 5 151555 TR333 TTSS MM S 1 258755 245 2 O Y lt ae 35 dels E e sn a R ol SPEAKER B m x l di uy i n 10 C340 C3420 0 0047 K X2 o O ee ee o eee A 5 N Q gt O O O O O O O O ws LSE Na aa aaa DEOR ERES AN wa _ apes a EID wa x Gi c x O D s S 7 un A ofS e 39 O Sia Blaja TER i wW TP 3 lt I vl I i 5 TR332 Gr PP mnt 250845 0 R 1 MAIN 1 a nos gans fv ei Y Ci2 Q Y Si PAIR li ue deae T Le e Tala Aer Ta d 5 ee E Protection circuii 03414 3 7 8 74 os 8 WO6C 2502229 0 Ji 2 5062229 0 Y i pam s TR347 gt lt m RITI a Pea z 22K Z a if D334 1S1555X2 2SC1983 x ls TR344 z AV lt oc PI 1 1 1 E 1 1 f I 4qj0 508 a IR3A 6 ann moame sommes ams mb O joa Y 25 99912 2 Si l 5 Q sialan lt x x
23. il 5 24 011 iActass PL and TP CONTROL c Board 1 1 NAOT7608 u N 07609 AG 8 n NAGIH RC when checking control board 1 with a voltmeter do not use the chassis ground as a reference Ensure to use the reference TONE CONTROL Board 1 NA07489 U NA07488 R A G C B point indicated ih the comprehensive schemati c diagram eI n LISTENNG LEVEL MONITOR ME pILIIAT 1 TONE CONTROL ES 0 v en 3 gi 4 ui s x LISTENING LEVEL MONITOR INDICATOR poeta Santi 0000 SPEAKER MAIN cs Board a mistors thermo sensitive n replacing avoid heating i REC 2 PB8 2 REC PBA AUX TUNER O PHONO i a soldering iron It is ead with radio pliers e FUNCTION C Board NAO7487 U NAO7486 R A G CB M idling current adjustment Ach iDiny SmY Across TP3TP4 M 2 f 2 5 ve yis em 3 m tim iul Be MESE EINE TMT tec RE CURRENT SERVO Al KL E INPUT tener PHONO Mcr RE dfifset voltage adjustment Pe 0 Across TF7 IPS 475 O3 USA ana Canada General 470 03ViNEurapean Austrapa British C Board 1 TONE CONTROL C Board 3 NA07489 3 U NA07488 3 6 TONE CONTROL C Board 2 NAO7488 2 C NA07489 U VOLUME co LEIDER NICHT BESSER
24. the signal across R513 UC 2P 3900 A G B 150 for the specified waveform A 760 N CONTENTS BEXPLODED VIEW HMM 1 BIPARTS LIST Mechanism m Hee 2 PARTS LIST Circuit Board Function C Board eee 4 Tone Control C Board _ 5 Main C Board 6 Control C Board 9 pieni 10 cm YAMAHA NIPPON GAKKI CO LTD HAMAMATSU JAPAN B EXPLODED VIEW A 7 60 General model ES Ny EJ M Rear Panel S i lt E 4 A ie Eo X x N gt sx S 4 35 E X 7 7 Accessory of head phones jock X2 Accessory of volume Xi PARTS LIST Mechanism A 760 Part Wo x 1 32 00 00 NB 09 88 90 1 1 42 00 00 i F 00 12 40 Description 8 f A Remarks AWAY t LED Orange SLB 26UU1N LEDA JL gt gt C 1 2 32 00 00 NB 09 39 20 Push Button Assy 9392 Fy vats Z Ass y CR 440 1 3 32 00 00 CB 09 97 50 Frame Slit 9975 2 F A 550 32 00 00 NB 09 14 30 Push Button Assy 9143 Tyas vAss y 00 09 14 EF 9145 1 6 dhesive Tape 157 5 5x80 1 8 42 00 00 CB 08 50 50 Tape Anti vibration 60 Rik 7 2 32 00 00 0 8 09 79 40 LED Knob Ass y LEDY 5 Ass y 32 00 00 NB 09 89 00 22 5 42 00 00 Transistor 2SB755 R O TAP RS YER TR333 42 00 00 i D 08 45 00 j 2SD845 R O TR331 n 1 5
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