Yamaha-AS2000-int-sch 电路图 维修手册.pdf

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1、ABCDEFGHIJ 1 2 3 4 5 6 7 A-S2000 37 + - + - A B PHONES SPEAKERS L/R CH R CH CD BAL L/R CD L/R TUNER L/R LINE1 L/R LINE2 PB L/R LINE2 REC OUT L/R PHONO L/R MC HEAD AMP EQ AMP ATT.1 ATT.2 ATT.3 ATT.4 ATT.5 ATT.6 TONE CONTROL DEVICES PRE OUT MAIN IN MM/MC RY_MMHC SPEAKER DRIVER LOW IMPEDANCE DRIVE HEAD

2、PHONE AMP. INDEPENDENT FLOATING POWER SUPPLY FLOATING BALANCED POWER AMPLIFIER VOLUME & TONE CONTROL R CH R CH L CH L CH for HOT POWER TRANSFORMER INPUT SELECTOR INPUT BUFFER INDEPENDENT REGULATED POWER SUPPLY (for AUDIO) For MC AMP For EQ AMP For LINE AMP1 For LINE AMP2 For VOLUME1 For VOLUME2 +20V

3、/-20V +25V/-25V +25V/-25V +25V/-25V +12/-12V +12V/-12V SUB-TRANSFORMER BUFFER AMP. BUFFER AMP. VOLUME INPUT SEL BALANCEBASSTRIM SPEAKER TREBLE REMOTE POWER SWITCH for MICROPROCESSOR FRONT PANEL MICRO PROCESSOR AC IN RY101 RY102 RY103 IC201 IC410 IC404 RY_BYP RY402 RY_DIR RY404 RY501 RY201/R111 RY202

4、/R112 RY_SPA RY_SPB JK501 RY_HP HP END PRDPRI THM +B3/-B3 D335 D336 D300 D301 D305 D304 PRV RY1 T1 34 60PRV1PRV PDET 17 16RY_PWR 35 4 5 36,37MVOL+/- 41-43A/B/C 46 39 25 REM 5I_BAS I_TRE 12 4 I_LRBAL 2I_SEL 1I_VOL LED_PWR 54 RY_UNBAL RY_BYP 532,3 PRD 1,64 THM 62,63 HP_PRD 48 PSVA1 47 PSVA2 RY_DIR 32R

5、Y_BAL 26RY_CD 27RY_TU 28RY_L1 29RY_L2 55RY_MMMC 56 14 15 HPTRIM IC501 IC502 SP_AB 9-113,4 RY_PHONO RY_SPB RY_SPA RY_HP VR501 PRV +33V -33V D306 PRV IC52 IC51 +12V PSVA1 PSVA2 -12V +B4/-B4 +B1/-B1 +B2/-B2 RY401 RY403 IC413 IC302 IC303 IC405 IC406 IC401 IC402 IC403 IC411 IC412 IC407 IC408 IC409 IC301

6、RY305 RY306 RY_BAL POL/POR RY UNBAL RY_PHONO RY_CD RY_TU RY_L1 RY_L2 Q1001-1016 Q1017-1038 FLAT SPCH A L/R CH SPCH B L/R CH (for POWER AMP / VOLTAGE AMP STAGE) HOT (POSITIVE PHASE) COLD (NEGATIVE PHASE) HOT(+) COLD(-) HOT(+) COLD(-) HOT(+) COLD(-) FLAT TONE CONTROL DEVICES HOT (POSITIVE PHASE) SIDE

7、for COLD for HOT for COLD SPEAKER DRIVER COLD (NEGATIVE PHASE) SIDE to POWER AMP. to SPEAKERS RELAY MAIN DIRECT BALANCE UNBALANCE CONVERTER BALANCE See page 59 SCHEMATIC DIAGRAM FRONT See page 64-66 SCHEMATIC DIAGRAM See page 60-62 SCHEMATIC DIAGRAM MAIN See page 63 SCHEMATIC DIAGRAM FUNCTION See pa

8、ge 60-62 SCHEMATIC DIAGRAM FUNCTION See page 60-62 SCHEMATIC DIAGRAM FUNCTION FRONT See page 64-66 SCHEMATIC DIAGRAM FRONT See page 64-66 SCHEMATIC DIAGRAM LINE AMP. I BLOCK DIAGRAM RadioFans.CN 收音机爱 好者资料库 W2001 CB203 CB201 CB202 JK202 JK201 IC201 IC201 A 1 2 3 4 5 6 7 8 9 10 BCDEFGHIJKLMN A-S2000 5

9、9 # All voltages are measured with a 10M/V DC electronic voltmeter. # Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed. # Schematic diagram is subject to change without notice. BALANCE SCHEMATIC DIAGRAMS

10、12.6 -12.5 0 0 -11.9 -11.9 0 0 0 0 0 5.8 6.4 6.4 0.3 0.3 0 -24.5 0.6 1.0 0.4 1.0 24.6 25.2 25.7 1.0 -0.8 -0.2 -25.4 25.7 5.8 5.8 5.8 -24.5 -0.8 -25.1 -25.7 -25.0 -0.20.41.0 24.6 0.3 0 5.8 6.4 6.4 0.3 0.3 0 0 -24.5 0.5 0.4 1.0 24.7 25.2 25.7 1.0 -0.7 -0.2 -25.4 25.7 5.8 5.8 5.8 -24.5 -0.7 -25.1 -25.7

11、 -25.0 -0.2 0.41.0 1.0 24.7 0.3 0 0 5.8 6.3 6.3 0.3 0.3 0 -24.5 0.5 1.0 0.4 1.0 24.6 25.2 25.7 1.0 -0.8 -0.3 -25.4 25.7 5.8 5.8 5.8 -24.5 -0.8 -25.1 -25.7 -25.0 0.4 1.0 24.6 0.3 0 0 5.8 6.3 0.3 -25.7 0 -24.5 0.6 0.4 1.0 24.7 25.2 25.7 1.0 -0.8 -0.3 -25.4 25.7 5.8 5.8 5.8 -24.5 -25.0 -0.8 -25.1 0.4 -

12、0.2 1.0 1.0 24.7 0.3 CD BAL L IC201: NJM2068MD-TE2 Dual operational amplifier OUT1 OUT2IN1 +IN1 +IN2 -IN2 VCC +VCC 1 2 3 4 8 7 6 5 + + CD BAL L CD BAL R to FRONT (12)_CB59 Page 66H2 to FUNCTION (3)_W3 Page 62H8 to FUNCTION (1)_W3005 Page 60K2 to FUNCTION (1)_W3006 Page 60K2 RadioFans.CN 收音机爱 好者资料库 C

13、B301 IC301 IC301 IC302 IC302 IC303 IC303 CB305 W3004 W3002 W3001 W3003 W3005 W3006 A 1 2 3 4 5 6 7 8 9 10 BCDEFGHIJKLMN A-S2000 60 # All voltages are measured with a 10M/V DC electronic voltmeter. # Components having special characteristics are marked s and must be replaced with parts having specifi

14、cations equal to those originally installed. # Schematic diagram is subject to change without notice. FUNCTION 1/3 12.0 -11.9 -11.9 -11.9 -11.8 -11.9 -11.9 0 0 -11.8 0 0 -11.8 0 0 0 0 0 -12.5 0 12.6 0 0 0 0 0 0 12.6 -12.5 0 0 0 -12.6 0 0 0 12.6 0 0 -11.8 0 0 -11.8 0 0 -11.8 0 0 -11.8 25.7 5.8 0.3 0.

15、3 0.1 0.3 25.6 0.9 0 1.0 0.9 0 0.5 1.1 24.6 25.1 0.9 0.3 0 6.4 24.6 5.8 24.6 1.1 24.6 25.7 -0.9 0 -25.6 -24.5 -24.5 1.1 0.6 25.7 -11.9 -11.9 -11.9 -11.9 0 -0.6 -25.6 25.7 0.6 25.7 0.6 0 -25.6 0.5 0 0.5 -25.6 0.9 1.1 -0.6 0.2 -0.9 -0.4 0.5 -0.1 6.3 5.8 5.8 -0.9-25.0 -24.8 -25.6 -0.6 0 0 0.3 0.3 0.3 5

16、.85.8 25.7 5.8 0.3 0.3 0.1 0.3 24.6 0.9 0 1.3 0.9 0 0.5 1.1 24.6 25.1 0.9 0.3 0 6.4 24.6 5.8 25.7 1.1 25.2 24.6 25.7 -0.9 0.3 -25.6 -24.5-24.5 1.1 0.5 25.7 0 -0.6 -25.6 0.9 1.1 0 -0.6 0.3 -0.9 -0.3 0.5 0.5 6.3 5.8 5.8 -0.9 -25.1 -24.8 -25.5 -0.6 0 0.1 0.3 0.3 0.3 5.8 5.8 -11.9 CD L IN L CD BAL L FUN

17、CTION (1) LINE 2 IC301: NJM2068MD-TE2 Dual operational amplifier OUT1 OUT2IN1 +IN1 +IN2 -IN2 VCC +VCC 1 2 3 4 8 7 6 5 + + IC302, 303: OP275GSR Dual bipolar/JFET, audio operational amplifier OUT A -IN A V- V+ OUT B 1 2 3 45 +IN A-IN B +IN B 6 7 8 to BALANCE_CB201 Page 59I5 to FUNCTION (2)_CB403 Page

18、61J4 to FUNCTION (2)_CB402 Page 61B6 to FUNCTION (2)_CB401 Page 61B5 to FRONT (1)_CB519 Page 64B5 to FRONT (10)_W1003 Page 65B5 to BALANCE_CB202 Page 59I7 to FRONT (10)_W1002 Page 65M5 RadioFans.CN 收音机爱 好者资料库 CB406 CB403 CB404 W4004 CB405 CB402 IC407 IC412 IC411IC410 IC404 IC404 IC408IC409 CB401 IC4

19、05 IC405 IC406 IC406 IC413 IC413 IC401 IC401 IC402 IC402 IC403 IC403 A 1 2 3 4 5 6 7 8 9 10 BCDEFGHIJKLMN A-S2000 61 # All voltages are measured with a 10M/V DC electronic voltmeter. # Components having special characteristics are marked s and must be replaced with parts having specifications equal

20、to those originally installed. # Schematic diagram is subject to change without notice. FUNCTION 2/3 012.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -12.4 0 0 -12.4 0 0 -12.4 12.5 -12.3 12.5 24.5 -11.8 0 0.3 -0.1 -25.3 0.7 0.7 -0.2 -25.8 -0.7 -24.6 -25.3 -25.7 0.4 0.3 5.8 5.8 0 0 0 -11.8 24.2 -25.2 12.6 0 0 0

21、 0 5.8 5.8 0 25.3 24.4 -24.5 0.5 -0.1 -25.0 -25.7 12.6 0 0 12.6 -12.5 -12.5 12.5 25.5 0.5 0.5 0 0 -25.8 -25.8 0.5 25.5 12.6 0.5 -0.5 0 0 -12.5 -12.5 -11.9 -11.9 0 0.6 -12.5 0.5 -12.5 -12.5 0 0.7 25.0 25.5 -0.2 -25.7 -0.7 1.0 0.4 1.0 6.4 5.8 0 0.3 0 0.3 0 6.4 25.5 24.5 24.9 25.5 1.0 0.4 1.0 5.8 5.8 1

22、2.5 0 -12.4 0 12.5 0 -11.9 -11.9 0 0 0 -12.4 0 -12.4 0 0 -12.5 0 0 -12.5 12.6 12.6 0 0 -12.5 12.6 12.6 -12.4 0 -12.4 0 0 -12.4 0 0 0 -11.9 -11.9 0 0 0 12.5 12.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 12.5 12.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -12.4 12.5 12.5 12.5 0 0 0 0 0 0 0 0 0 0

23、0 0 0 0 0 0 0 0 0 0 0 0 0 0.1 0 0 0 0 -12.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -12.4 12.5 12.5 12.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1 0 0 0 0 -12.5 0 0 0.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1 -12.5 12.5 12.5 12.5 0 0 0 0 0 0 0 0 0 0 0 0.1 0 0 0.1 0 0 0 0 0 0 0 0 0.1 0 0 0 0 -12.5 12.5 0 0 0

24、 0 0 0 0 0 0 0 0 0 0 0 0 0 -12.5 12.6 12.5 12.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 12.5 0 0 0 0.1 0 0 0 0 -12.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -12.5 12.6 12.5 12.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 12.5 0 12.6 0 0 0.1 0 0 0 0 -12.5 -11.9 -11.9 0 0 0 5.8 5.8 6.4 25.4 24.4 24.9 1.1 1.1 25.4 0.

25、4 5.8 5.8 24.4 0.3 0.3 0.5 -0.7 -0.4 -0.7 -0.1 -25.8 -24.7 -24.7 -25.8 0 -11.8 0 0 -11.8 25.4 24.9 25.4 1.0 0.4 24.4 1.0 6.3 5.8 5.8 0 0 24.3 -0.4 -0.2 -0.7 -24.7 -24.7 -25.3 -25.8 5.8 0.3 5.8 -0.7 0 -25.8 -0.7 0.3 OUT L IN L IC413: NJM2068MD-TE2 Dual operational amplifier OUT1 OUT2IN1 +IN1 +IN2 -IN

26、2 VCC +VCC 1 2 3 4 8 7 6 5 + + IC401-406: OP275GSR Dual bipolar/JFET, audio operational amplifier OUT A -IN A V- V+ OUT B 1 2 3 45 +IN A-IN B +IN B 6 7 8 IC407-412: TC94A81UG Electronic volume control Zero crossing detection circuit Decoder 24-bit shift register 39 38 37 36 35 34 33 1 3231302928 L-S

27、W-IN4 L-SW-OUT L-ZX-IN L-ZX-AGND L-MVR-IN L-MVR-AGND1 L-MVR-AGND2 R-MVR-AGND2 L-MVR-OUT R-MVR-OUT L-TVR-OUT R-TVR-OUT L-TVR-IN R-TVR-IN L-TVR-REF R-TVR-REF NC 40L-SW-IN3 41L-SW-IN2 42 43 45 L-SW-IN1 TEST VDD SS1 R-SW-IN4 R-SW-OUT R-ZX-IN R-ZX-AGND R-MVR-IN R-MVR-AGND1 R-SW-IN3 R-SW-IN2 R-SW-IN1 NC V

28、SS Latch LatchLatchLatch Latch Latch Zero crossing detection circuit LatchLatch Latch Decoder 2726252423 Latch 22 21 20 19 18 17 16 15 14 13 12 2 SS2 3 CS1 4 CS2 5 MUTEM 6 GND 8 MUTE 9 CK 10 DATA 11 STB 7 TC Timing gene Test and Power ON reset Level shift FUNCTION (2) to FUNCTION (1)_W3003 Page 60K3

29、 to FRONT (11)_W6 Page 66F4 to FRONT (1)_CB517 Page 64K6 to MAIN (1)_W102 Page 63A3 to MAIN (2)_W202 Page 63A8 to FUNCTION (1)_W3001 Page 60K4 to FUNCTION (1)_W3002 Page 60K6 W1 CB25 CB23 IC52 IC51 W11A W11B CB2 W10A W10B W3 W4 A 1 2 3 4 5 6 7 8 9 10 BCDEFGHIJKLMN A-S2000 62 # All voltages are measu

30、red with a 10M/V DC electronic voltmeter. # Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed. # Schematic diagram is subject to change without notice. FUNCTION 3/3 AC29.8 AC20.4 0 0 0 0.9 0 0 4.9 5.0 5.0

31、0 0 5.1 0 16.6 16.6 16.6 16.6 16.6 8.4 16.68.3 0 0 0 5.0 0.8 0 0.1 8.9 8.9 8.9 8.9 0 9.5 8.9 9.5 9.8 8.4 26.4 8.4 26.4 26.4 9.5 0.1 8.9 8.9 8.9 8.1 0 8.9 10.1 -19.4 0 0 19.6 12.2 -11.9 -11.9 -11.9 12.0 0 0 5.0 12.2 -11.9 12.0 0 1.3 0 -12.0 19.4 0 0 19.612.2 -19.6-12.0 FUNCTION (3) IC51: NJM7812FA Vo

32、ltage regulator INPUT OUTPUT COMMON IC52: NJM7912FA Voltage regulator COMMON OUTPUT R23 R24 R13 R14 R20 R17 D3 Q22 Q21 Q25 Q20 Q24 Q18 Q9 R18 R19 R16R15R21R12R11 R10 Q17 R9R8 R7 R5 R4 D2D1 R6 C1C2 C3 R22 Q11 Q13 Q14 Q15 Q19 Q16 Q23 Q8 Q7 Q2 Q1 Q6 Q5 Q3 Q10 Q12 Q4 R1 R2 R3 INPUT to BALANCE_CB203 Page

33、 59I3 to FRONT (13)_CB79 Page 66H6 To POWER TRANSFORMER to MAIN (3)_W317 Page 63L3 to FRONT (1)_CB501 Page 64B4 to FRONT (14)_W8A, W8B (R, L models) AC IN To POWER TRANSFORMER POWER ON/OFF switch (U, C, T, K, A, B, G, J models) 600mm 2P Page 66B4 W102 CB52CB72 CB54 CB75CB55 IC102 W103 CB21 CB22 W303

34、C W104 CB24 W317 CB26 W303D W303B W303A W316 W318 W315 W314 W304D W304B W304A IC303IC301 IC302IC300 W304C CB74 CB76 CB73 W204 W203 CB71 IC202 CB84 CB79CB80 CB77CB78 CB57CB58 CB59 CB64 CB60 W202 A 1 2 3 4 5 6 7 8 9 10 BCDEFGHIJKLMN A-S2000 63 # All voltages are measured with a 10M/V DC electronic vol

35、tmeter. # Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed. # Schematic diagram is subject to change without notice. MAIN AC89.5 AC48.5 DC51.4 DC51.4 AC38.5AC38.5 AC38.5 AC38.5 DC51.4 DC51.4 58.258.2 58.2

36、 58.2 2.9 2.9 3.4 -1.8 2.9 -2.0 60.2 -60.7 58.2 58.2 60.1 60.8 59.4 58.2 0.6 -50.9 0.6 -1.8 60.8 59.4 58.8 0.6 58.2 0.6 0 -50.9 50.9 -51.9 -51.4 -51.9-52.4 -1.8 -51.2 -1.8 1.8 -52.4 -53.1 -1.8 -1.8 -53.1 -52.5 60.6 -53.3 -53.0 -0.8 -1.7 -0.7 -0.7-1.0 -1.0 -0.9 60.6 -1.7 -1.7 -1.7 -1.7 -1.7 -50.9 -53

37、.2 60.8 -1.7 0 60.860.8 0 0.95.1 1.3-0.7 12.7 -0.7 60.7 1.3 -0.5 50.8 50.3 -1.0 0.5 50.3 6.6 0 6.1 6.1 57.4 6.6 0 6.1 0.60.6 0 0 -1.0 -45.0 0.5 -45.5 -45.0 -1.0 -45.5 0 0 -22.1 -20.9 -1.0 -22.1 -39.8 -45.0 -57.3 0 1.1 0 22.0 39.8 21.2 1.1 22.2 0 0.6 61.1 -61.0 32.2 -32.2 24.6 0 4.6 -24.4 24.6 4.4 0

38、-23.8 -10.8 -15.5 -16.5 -15.6 4.8 4.6 33.6 33.6 -52.7 -53.8 5.1 34.1 -53.9 -52.8 5.1 0 -16.5 -15.6 -24.5 24.9 0 4.4 3.7 -16.5 -15.5 5.1 0 0 4.8 -16.5 -10.8 33.8 5.1 5.1 33.75.1 33.7 -52.7 -53.8 5.1 33.8 -53.9 -52.5 39.6 21.2 1.1 1.1 0 0.2 0 -0.1 -1.0 -0.5 -1.0 -45.5 -45.0 -45.0 0.5 -45.6 -45.0 6.1 5

39、0.4 6.1 6.6 0 6.0 6.6 57.4 60.8 12.6 -50.9 -51.6 -52.1 60.8 60.8 60.7 0 -1.5 -1.5 -1.5 -51.6 -52.5 -53.1 -1.5 -52.5 -53.1 -1.5 -52.5 -53.1 60.6 -53.1 -53.1 -1.2 -1.5 -1.2-1.5 -1.2 60.6 -1.5 -53.1 -52.5 -1.5 -53.1 -52.5 -1.5 -53.1 -52.5 -1.5 60.8 58.8 58.8 59.5 60.2 59.8 60.2 58.3 58.3 0.6 0.60.6 0.6

40、 58.8 -50.9 -56.7 -59.5 58.3 58.3 58.3 3.6 4.1 3.6 -1.4 -1.6 4.1 -1.4 58.3 58.3 3.6 4.1 -1.6 -1.4 3.6 0 -50.9 -55.7 -1.5 -52.6 -52.1 -1.5 -50.9 58.3 60.2 60.8 60.8 -60.7 -51.6 -1.5 -52.1 -51.6 -53.1 -53.1 -1.5 -53.1-53.1 -1.5 -1.5 -52.5 -51.0 -0.6 -1.2 -0.6 -1.2 6.6 6.0 0.5 0 00.5 -57.2 -20.9 -21.8

41、-39.8 0 -21.8 -0.1 0.5 0 -0.5 -1.0 22.0 0.6 0 22.0 1.1 50.9 50.4 1.1 34.1 -15.5 -10.8 -15.5 -16.5 -16.5 -15.6 -10.8 -10.8 0 0 -16.5 -15.6 -10.8-10.8 0 -16.5 -10.8 23.8 0.6 3.2 -23.8 3.7 6.6 0.5 6.1 1.1 0 -51.6 -52.2 -51.6 -52.2 -52.5 -53.1 -52.5 -52.6 -53.1 -53.1 -53.1 -53.5 -53.5 -53.3 -1.8 -52.4 -

42、53.1 -1.8 60.8 60.8 59.8 3.4 3.4 -1.8 1.8 2.9 0 0.95.1 Ground point Ground point OUT L IC102, 202: LM61CIZ Temperature sensor MAIN (1) MAIN (2) MAIN (3) MAIN (4) MAIN (5) Idling adjustment Idling adjustment # # # # # # # # # # Head phone DC offset Head phone DC offset Note) Those parts marked with “

43、#” are not included in the P.C.B. assy. （部品、基板含。） to FUNCTION (2)_CB406 Page 61J3 to FUNCTION (2)_CB405 Page 61J7 to FUNCTION (3)_CB25 Page 62C6 to FRONT (11)_CB34 Page 66B3 To POWER TRANSFORMER To POWER TRANSFORMERTo POWER TRANSFORMER To POWER TRANSFORMER to MAIN (3)_W318 M2 to MAIN (2)_CB73 K8 to

44、MAIN (2)_CB72 C9 to MAIN (1)_CB52 C5 to MAIN (2)_CB75 F6 to MAIN (1)_CB55 F1to MAIN (3)_W314 M2 to MAIN (3)_W315 M2 to FRONT (2)_CB504 Page 64C9 to FRONT (1)_CB521 Page 64K8 to FRONT (12)_W101A, W101B Page 66H4 to FRONT (13)_W201A, W201B Page 66H8 安全対策 製品内部高電圧部分危険。修理際、絶縁性手袋使用安全対策行。 下記箇所電源OFF後電荷残、高電圧

45、維持危険。 修理作業前放電用抵抗 （5 k/10 W） 下記箇所端子間接続放電。放電所用時間約30秒間。 1. MAIN （3） P.C.B.C308 2. MAIN （3） P.C.B.C309 3. MAIN （3） P.C.B.C335 4. MAIN （3） P.C.B.C336 Safety measures Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such as wear

46、ing insulating gloves. Note that positions indicated below are dangerous even after the power is turned off because an electric charge remains and a high voltage continues to exist there. Before starting any repair work, perform discharge by connecting a discharge resistor (5k-ohms/10W) between term

47、inals at following positions. The time required for discharging is about 30 seconds. 1. C308 on MAIN (3) P.C.B. 2. C309 on MAIN (3) P.C.B. 3. C335 on MAIN (3) P.C.B. 4. C336 on MAIN (3) P.C.B. 5 k-ohms 10 W 5 k-ohms 10 W 5 k-ohms 10 W 5 k-ohms 10 W CB501 IC505 IC501 CB515 IC502 JK501 JK501 CB503 CB5

48、24 CB525 CB504 W5002 IC504 CB517 CB519 CB521 CB507 CB509 W5004 W5006 W5003A W5005A W5005B W5009A W5009B W5007A W5007B W5003B CB512 W5008 IC503 A 1 2 3 4 5 6 7 8 9 10 BCDEFGHIJKLMN A-S2000 64 # All voltages are measured with a 10M/V DC electronic voltmeter. # Components having special characteristics

49、 are marked s and must be replaced with parts having specifications equal to those originally installed. # Schematic diagram is subject to change without notice. FRONT 1/3 0 0.7 5.10.2 4.3 2.1 0 0 0 12.1 5.6 5.85.1 5.1 4.4 4.3 3.6 5.1 8.75.8 5.85.0 5.8 0 0 5.6 2.5 2.6 1.3 1.3 2.5 2.6 2.5 2.5 2.5 5.0 -11.8 -11.8 5.0 5.1 0 5.0 -11.80 0 0 0 0 11.9 0 0 12.0 12.0 00 11.9 0 00 11.9 0 0 0 11.9 11.9 11.9 12.0 12.0 12.0 12.0 -11.9-11.9 -11.9 0 0 11.9 12.0 -11.9 0 0 11.9 12.0 -11.9 12.0 -11.8 12.0 0 0 5.0 0 0 5.0 12.0 0 11.9 0 11.8 12.0 5.0 5.3 5.3 5.3 -