yamaha_a-760ii_stereo_amplifier 电路图.pdf

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1、sE EO I LIFIEfi3 TEqhTEDAM ) SE VICE MAN . FRONT PANEL 1 , - - ,- :-:; : ; ; -.-=.- -,.- , Q. , :Q l,_/ . . _ . _ . . . .,T . ,-I (. 11 . .-. 1 , : I Power Switch Treble Control f) Listening Level Monitor . High Filter Main Direct Switch Loudness Control Disc Switch Balance Control Muting Switch a.

2、Mode Control (1) Volume Control Phono Selector Speaker Switch Rec Out Selector o Phones Jack f) Input Selector Bass Control . CONTENTS Rearpanel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Names of the Parts 2 D

3、isassemblyInstructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Adjustments . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 PrintedCircuitLayout. . . . . . . . . . . . . . . .

5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 PrintedCircuit Board/Wiring _ . . . . . . . . . . . . . . . . 9 Complete Circuit Diagram 10 3 SINCE 1887 YAM A H I 004458 I NIPPON GAKKI CO. LTO. HAMAMATSU, JAPAN .82.3.2 .65K f Pnnted rn Japan, RadioFans.CN 收音机爱

6、 好者资料库 - - A-760 n .REAR PANEL Tr r I, l:Jm c-. . -=I CI LSZ. 1-1 r fJ UTlJH ) ftll FlhIM ll( sotW5.SIEBOT Il).! rOH AlTEHfOI PIlS EPlIVERusI$.L A. usM;nU :T)MAUOESSClJS Cl: LIAWlL iii1J : ciIr:rFlt (Jl then remove the bottom cover. Photo 2 3. Removing the front panel a) Remove the top cover (step 1

7、). b) Remove the bottom cover (step 2). c) Loosen the Speaker, Rec Out and Input knobs with a 1.5 mm allen wrench. PuHeach knob off its shaft. d) Disconnect the wires from the Power, Main Direct, Disc and Muting switches being carefule not to brake them. e) Remove screws CD and 0 in photo 3 and remo

8、ve 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. R

9、emoving tone control boards 1, 2, and 3, main boards 4 and 5 and the power switch a) Remove the top cover, bottorn cover, and front panel (steps 1,2,3). b) Pull off the Bass, Treble, Loudness, Balance and Volurne controls. c) Tone control boards 2 and 3 can be removed by taking out nut and screws G)

10、 in photo 5, d) Tone control board 1 can be rernoved by taking out screws (j) and and nuts in photo 5. e) Main board 4 is removed by ta king out screws and and pulling off the Listening Level Monitor knob in photo 5. f) The power switch can be removed by removing screws and in photo 5. g) Main board

11、 5 can be rernoved by pulling out the phone iack fastener in photo 5 in the direction of the arrow. 3- - - - - - - - - - 7. Removing main board 1 and the heat sink? a) Remove the top and bottom covers,? b) Remove the function board (step 5).? c) Desolder power transistors TR335 -TR338.? d) Take out

12、main board 1 by removing screws CD-? in photo 6. e) Detach connectors - in photo 6. f) Remove the heat sink by taking out screws - in photo 6.? *Make sure that transistors TR321 and TR322 are? correctly connected to the heat sink for proper heat? dissipation,? Photo 6 A-760II 8. Removing the power t

13、ransformer and primary 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 imary boards 1 and 2 from board fasteners and . d) Remove the power transformer cover by taking out screws -in photo 7. e) Take out screws CD -8)

14、 in photo 8 to remove the power transformer. Photo 8 - - - - - - - - - - - - - - - - - - - - - - - - - -4? .SPECIFICATIONS Minimum RMS Output Power? Signal-to-NoiseRatio (NEW IHF) 8 ohms, 20 to 20,OOOHz (Main Direet ON) Phono MM _ _. _ 74.5 dB 0.005% THD 80 W + 80 W Phono MC . _ 78 dB 8 ohins, 1 kHz

15、 0.002% Aux/Tape/Tuner 85 dB (Main Direct THD . 80 W + 80W ON) 4 ohms elipping power Residual Noise . 1 kH 0.5% THD 150 W + 150 W (lHF A Network) . _ . . . . 65 p.V Total Harmonie Distortion Input Equivalent Noise (20 Hz to 20 kHz) Phono MM - 138 dB V Phono MM to Ree Out Phono MC _ - 142 dBV (5 Vout

16、put! 0.003% Filter Charaeteristics Phono MC to Ree Out High 10 kHz, 12 dB/oct. (5 V output 0.006% Channel Separation Aux/Tape/Tuner to Sp (1 kHz, vol. -30 dB, Shorted) Out (40 W, Main Direet A ux, Tuner to Sp Out 70 dB ON) . : 0.005% Phono MM to Sp Out . . 70dB IM Distortion Ratio (60 Hz : 7 kHz =4

17、: 1) Phono MC to Sp Out. . . . . 70dB Aux/Tape/Tuner to Sp Out Continuous LoudnessContral 8 ohms, 80W . . . . . . . . . 0.002% (Level-Related Equalization) 8 ohrns, 1 W 0.01 % Max. Atte nuation 20 dB at 1 kHz Power Bandwidth (Main Direet ON) Audio Muting _ . . -20dB (8 ohms, 40 W, 0.02% Gain Traekin

18、g Error THD) . . : , 10 Hz to 100 kHz (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 (Auxtape/Tu ne r to Sp Power Supplies. . . . . . . . . . . 120 V. 60 Hz (U,C) Out, 8 ohms) . . . 1 Hz

19、 to 100 kHz 220 V. 50 Hz (G,W) , (+0, -2 dB) 240 V, 50 Hz (A, B) RIAA Deviation 110/120/220/240 V, Phono MM . 0.2 dB 50/60 Hz (R ) Phono MC . 0.3 dB Power Consumption . , . . . . . 350 W/850VA (Cl Input Sensitivity/lmpedance 350 W (U, R) Phono MM . 2.5 mV/47 k ahms 520 IN (A, G, B, W) PhonoMC . 160

20、JJV/ 100 ohms AC Outlets Aux/Tape/Tuner . 150 mV/47 kohrns Switehed x 2 . 100 W max total Maximum Input Level (1 kHz) Unswitched xl . . . . . . . . 200 W max Phono MM . 180 mV RMS Dimensions (W x H x D) . 435 x 112 x 365 mm Phono MC . 10 mV RMS (17-1/8 x 4-7/1 6 x T one Control Charaeteristies? 14-3

21、/8 ) Bass . 10 dB at 20 Hz Weight . . 9.1 kg (20 lbs., 7 oz.)? Treble . lOdBat20kHz? Turnover Frequeneies Specifieations subjeet to change without notiee.? Bass . 500 Hz T reble . 3.5 kHz U : USA. Model Output Level/lmpedance C : Canad ian Model Ree Out . 150 mV/270 ohms R : General Model Signal-to-

22、Noise Ratio A : Au stralian Mod el (I HF A Network, Input B : Bri tish Mod el Shorted) G : European Model? Phono M (5 mV) . . 92 dB W : West GermanyModel? Phono MC (500 JN) . 76 dB? Aux/Tape/Tuner? 106 d B (Main Di rect? ON)? 5- A-760 II? GENERAL A JUSTMENTS Before adjustment ? Make sure that the AC

23、 line is 10% ? Wait 5 minutes after power-on to stabilize amplifier operation Test Step Adjustment Conditions Loeation Test Point Value Equipment : Main B+B-?Between chassis ground Digital Main board 1 voltage ad-No load? and P1 terminal of pri-47.5O.3V voltmeter1 VR303 justment mary board (test er)

24、 Between P1 and TP3 of the primary board 1.2VO.1V Photo coup- Minimum volume, (if out of ranqe, turn to VR501 and VR303 (2.0V0.1V 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 V

25、R301 (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 replacing the photo-coupler, Also, perform steps 1 and 2

26、simultaneously (with two digital voltmeters). ADJUSTMENT LOCATION DIAGRAM Main c. board 1 D VR301 (L )? VR30 2lRl TP3 ? Primary c. board 1? c 00 TPI TP4 c c TP 2 c VR501 o0 0501 0 10 TR501 TP5 o D? o ? TP 7 rp6 c o PlmTP3 FRONT Primary c. board 2 - - - - - - - - - - - - - - - -6? A- 7601I - J BL CK

27、DIAGRAM /. ZDR oe SER. O TONE AMP HI GH POWER .tMP REC INPU T DISC MODE FILTER LOUDNESS PHONO MUTING 1 BALANCE , BASS TREBLE - - VOLUME AUX TUNER -t_1 HEAD P HONE PB TAPE PB 2 TAPE t-lIEO UIlSWIT CJC D 1OO . M.tllC . TOT. zoo . U,ll. AC OUTI.ETI I I II - - ri- i . oe. -, . PR I.AY,+-+-.;- -.C.BO,.,Q

28、,.,d ,.,.,.,. r-, - i ! ;A C.Boord l 1 I. : I1 1 :I j ,I I L c: II L-_.-, - _ . CO _:._C J I I - 9_:- - - - - - - - PARTS LST A- 760 I1 STEREO AMPLIFIER .CONTENTS Pag .EXPLODED VIEW(Aliover) 1 .PARTS LlST(Aliover) 2 PARTS LIST(Circuit Board) Tone ontrol Circuit Board . . Function Circuit oard 5 Main

29、 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

30、- - A-760 II . EXPL DED VIEW (Aliover) 1 - PARTS LlS (All ov er) Ref . Part No. Description No. ($ .Ib :) Remarks Cammon model Markets 1 NB:60:43:70 Front Panel Unit 7 C / JL-.:L:;I J NB:60:43 : 80 . W,R.UAG,C,B 2 NB:60;4i 90 Knob Assy 77 Assy 3 iA : 11 ;69 ;00 Transistor 2SA 1169(O,Y) 7/:;I.1 4 iC

31、27 73 : 00 , 2SC2773(O,Y) 5 iL :00: 02 : 70 Mica Base AC-2Z9 711-;I. 6 iL OO 06 00 MT-ZOO 7 BA :08:25:30 ;Heat Sink M: 8 CB:07)8:80 Bush jJ7 ;lY.:J. 9 Ei :33:0 1: Z0 Bind Head Tapping Screw axlZIFCM3-Bl) i:;1/1-:1;I1/Y- W n NA :07 :86;20 R,A,G,B NA :07 ;86:30 tt U NA ;07 :86 :40 . C 24 NA :07:86:60

32、Control Circuit Board :tJ1.Y- R NA ;07 :86 :70 , U,C NA :07 :86 :80 ., W,A,G,B 25 KA ;80 ;23 :1O Push Switch SDV3P E5A125V 7;lY.:J.SW J , KA :80 :23 !20 SDV3P TV-5 U KA ;80 :24;30 Z-33-6 TV-8 C 26 Fi :16 :4 1:00 Ceramic Capacitor 0.01 150VACE(P) -i!7:J/ J Fi ;34 ;4 1;00 n 0,01 MY(DE) U,C 27 CB !09 ;

33、5Z :60 Cover for Capacitor CB :60 :0 8 :10 Cover fo r Capacitor SB-0833 HY-Ol0Z :J /T/-lj-1-il.ll! :J /T/-ft-1)-.f.1Lll! U J * :New Parts lWT!lll.l, ) - - - - - -2 A-760II? Ref. Common No. Part No. Description ($ .ll. ) Remarks model Markets 28 GA 6 3 59 ioo Power Transfo rmer ;!H 7 / A A-760 U , GA

34、 :63:60: 10 , W,G GA:63:6.1 : 10 , , A,B GA :6 3 :85:20 n C , GA ;64:43:20 , n J GA :63 :62: 10 , , , R 29 KA 40 :0 7 i40 Slide Switch ESD-3992 A7-1 r sw R 30 LB 20 :1 3 :00 Fuse Holder I:. - -x,j1L-7 -R 3 1 JB ;00 : 11;00 Pilot Lamp Lead Type 8V 0.15A 1 C y 7 /7 1) -tit 32 KA :90:30:30 Remote Rotar

35、y Switch CONTROL + wire I) E- c - 9 I) - SW 33 KA 90 : 16 :50 , 34 KA :90 :16:70 Remote Push Switch Wire Section 1)E-7 Y ;-SW R.U,A.G.C,B n KA :90 31 :80 , ., W 35 KB:00:13:00 Fuse T7A 250V 1:.-;(917 ;1;.-R 36 37 AA :60:35: 50 Top Cover AA :60:36:20 Bottom Cover ;I 7tJ- * J.tJ,- A-760 , 39 AA :60:41

36、;90 Holder.CS CS;t-JL-7- 40 AA :60:38: 50 Tight Screw with Steps tltit,*:; 4 1 BA :0 7:72:80 Knob, (TONE CONTROL ) TC;l 7 CR-240 42 BA :08:25:40 . , (VOLUME) VOL 43 BA :07 :94:60 , (Switch) SW A-760 45 BA ;07:95: 70 Cover. Power Transformer 7/AtJ-J,RA G,B , BA :07:99; 10 n U,C 46 CBi60: 2 4 30 Isola

37、tion Plate 1It 10 R,U.A.G.C.B 47 CB 60 !29 :20 Speacer. Switch SWA-:.-tt- C 48 CB :09:97:40 Slit Cover AI) ;t tJ,- 49 CB :09: 98;30 Support,P.C pC-tt;f.- 50 CB ;09:9 9: 10 Rubber,Anti Vibration 1lJi1i:iJ. 51 CB:60:05:70 Bush 1 ) -17.;1;.- 52 CB:60;1 4:40 Stopper.Voltage Selector VSA ;I -R 53 BB :06:

38、97:90 Speacer A-:.-tt-J 54 CB;09:98: 10 Rubber,Anti Vibration 1lJi1i:iJ. 55 CB;09:86;00 Leg M * 56 CB:60:43:80 Damper 7 /- 57 CB:60 :0 5:80 Tape,Anti Vibration IlJiIiT-7 58 ED:33:00:60 Bind Head Screw 3 x 6(FCM3-BI ) 59 EA :34;07;50 Pan Head Screw 4 X75( ) 60 EZ :00 ;08: 10 B.W Head Screw 4 x 8q,10(

39、FNM33g) a1L-f -? 7 .- 7 r . 6 1 EV :2 1:84:00 Flat W asher 4 jIilljZii: ( , j :1I.) 62 EV :4 2:90:30 Toothed Lock Washer M3(FCM3-BI ) 9I-llIiitf H1ii: 63 M i ;06 :99:50 Wire Cord L=80 2P I) */7-11- 64 iF iO O :18: 90 LED SLR-34UR(Red) LED (jjj;) PHQ, : : Accessories Assembly itlUAs s y TX:90;09! ac

40、Hexagonal Wrench 1.5 ./, 1i!v/T ii1- 0102 iF 00:21 :20 BZ-162 0103 : , IC101 iG 05 :44:00 IC TA75559P IC I - : I SW101 KA 90:16:80 Remote Push Switch 4 Circuit 2pornt I E 7 / .:I. sw SW102 KA 90 :12:30 Remote Rotary Switch 4 Circuit6Point SW103 I E IJ -7 I -SW . PJ10l LB 20: 17 ;30 Pin Jack 2P PJI02

41、 LB60 :19 :30 - PJI03 6P 2PI:.-:;,/ 7 f-. 6PI:.-:; / 7 BB 00 44:30 Contact Pin 1-z.5Pitch SHFOO 1TOBCS 2,5!: /7:l:.-7 7 1:;. HO LB 30 :07 :20 Huseing 2.5Pitch H3pSHF , -! 2.51:/77 :; :-/ CB 60 :63:80 Shiled Cap HY-0202 -)j, f- / 7 Mi 07: 44: ac Shiled Wire Flat tvpe L =100 :qrl;WPVC-lj, _ W LB 20 :1

42、3 :90 8ase Pin 2,5Pitch TEB2pSHF 2.51:/7-A 1:. :. LB 20:13:80 Housing 2.5Pitch H2pSHF 2.5t.777:; :-/ LB 30 07 : 30 Base Pin 2.5Pitch 3P TEB3pSHF 2.5I: /7-A 1: :. LA 00:21 :10 Wrapping Terminal 2P P=5 i-type il;W 5 / 1: :.-:f Jii! ftR * :New Parts Ciillll,ll, ) -5- - - - - - - - - - - - - A- 7601 Ret

43、 . Part No. Description No. (llll .ll. ) Remarks Common model Mar ket s NA:07 :96:4Q Main Circuit Board ;l -r ;, /- W NA;0 71 8 6 :2O . I R.A.G .B NA (7 ;8 6:30 U NA;07:S6 :40 , C C301 FH :6 1 :11:00 Ceramic Capaeiter C302 1OPF 500VCH -type -t!7:J:- C303 FG :4 1 :14 :70 C304 47PF SOV(K) C305 FZ :0 0

44、: 30: 10 Electrolytic Capaeiter C306 2.2!,F 2SV BP777- ;I;-:J :- C307 UA :2S :32 :20 Mylar Capaeiter C308 0 .0022 50V(J) 77-:J:- C309 FZ !OO:30 : 10 Electrolvtic Capacitor C310 2.2!,F 2SV BP777-;I;-:J :- C311 UW!84 :81 :00 C3l2 100!F 25V ;-:J:- C313 FH :61 :14!70 Ceramic Capacitor C314 47PF 500VCH-t

45、ype -t!7:J:- C315 FH :61 :21 :20 C3 16 120PF . C317 FG :4 1:14! 70 . C3 18 47PF SOV(K) , C319 UW:82 :81 :0 0 Electrolytic Capacitor 322 100!F 10V ;-:J:- C323 UW!8S :81 !OO 326 100!F 3SV , C327 UJ :47 :82 :20 . C328 220!F 63V C329 UA :2S :S1 :00 Mylar Capacitor C330 O.I!,F SOV(J) 77-:J:- C331 FC :04 :4 1:00 , 334 C335 FH :61 :1S :60 Ceramic Capaeiter C336 O.OI!,F 400V(K) 56PF 500VCH-type -t!7:J:- C337 UA :2S :S1 :00 Mylar Capacitor C338 O.1!,F 50V(J) 77-:J:- C339 UW:86 :81 :00 Eleclroly