Service Manual
Page 1
... or electronically without notice or obligation to retrofit. Discharge any service required should be performed by the users, and have accumulated by YAMAHA and may not be accurate and applicable to the unit(s) indicated on the cover. I CONTENTS TO SERVICE PERSONNEL 2 FRONT PANEL... an authorized YAMAHA Retailer or the appointed service representative. Should any form. IMPORTANT: Turn the unit OFF during disassembly and part replacement. For these reasons, we advise all work before you apply power to the unit. STEREO AMPLIFIER A-S2000 SERVICE MANUAL A-S2000 IMPORTANT NOTICE ...
... or electronically without notice or obligation to retrofit. Discharge any service required should be performed by the users, and have accumulated by YAMAHA and may not be accurate and applicable to the unit(s) indicated on the cover. I CONTENTS TO SERVICE PERSONNEL 2 FRONT PANEL... an authorized YAMAHA Retailer or the appointed service representative. Should any form. IMPORTANT: Turn the unit OFF during disassembly and part replacement. For these reasons, we advise all work before you apply power to the unit. STEREO AMPLIFIER A-S2000 SERVICE MANUAL A-S2000 IMPORTANT NOTICE ...
Service Manual
Page 13
... 4 screws (C). (Fig. 5) g. Remove 18 screws (D). (Fig. 5) c. Remove the power unit. (Fig. 5) B JHʣ C D JHʣ D JHʣ E E JHʣ F JHʣ G JHʣ 13 A-S2000 Remove the amplifier unit L together with the heat sink. 3ͷ֎͠ํ B 9ͷωδຊɺ0 JHʣ C JHʣ D A JHʣ E JHʣ F ͢...
... 4 screws (C). (Fig. 5) g. Remove 18 screws (D). (Fig. 5) c. Remove the power unit. (Fig. 5) B JHʣ C D JHʣ D JHʣ E E JHʣ F JHʣ G JHʣ 13 A-S2000 Remove the amplifier unit L together with the heat sink. 3ͷ֎͠ํ B 9ͷωδຊɺ0 JHʣ C JHʣ D A JHʣ E JHʣ F ͢...
Service Manual
Page 15
Then place the P.C.B. A-S2000 When checking the P.C.B.: • Remove frame panels L/R. • Put the rubber sheet and cloth over this unit, the ground of the amplifier unit L/R is also possible to the chassis. When the amplifier unit L/R is removed from the chassis, connect the ground point... to the chassis, using a ground lead wire or the like. (Fig. 7) • It is connected to check the amplifier unit L/R from the bottom. (Fig. 7) 1 3 1$#Λ JH 3 3 JH 3 JHʣ AMP unit L Rubber sheet and cloth Ground lead ...
Then place the P.C.B. A-S2000 When checking the P.C.B.: • Remove frame panels L/R. • Put the rubber sheet and cloth over this unit, the ground of the amplifier unit L/R is also possible to the chassis. When the amplifier unit L/R is removed from the chassis, connect the ground point... to the chassis, using a ground lead wire or the like. (Fig. 7) • It is connected to check the amplifier unit L/R from the bottom. (Fig. 7) 1 3 1$#Λ JH 3 3 JH 3 JHʣ AMP unit L Rubber sheet and cloth Ground lead ...
Service Manual
Page 19
... (Rch) so that the DC voltage of this unit must be connected to +8.0 mV 19 R ch VR101 DC +4.0 to +8.0 mV CB75 CB55 Front side Fig. 1 A-S2000 CB75 DC +4.0 to +8.0 mV CB55 DC +4.0 to the speaker terminal of CB75 (Lch)/CB55 (Rch) becomes +4.0 to +8.0mV. (Fig. 1) DIʣʗ$#ʢ3DI N7... (1) P.C.B. (Side A) R ch VR101 MAIN (2) P.C.B. L ch VR201 MAIN (1) P.C.B. Condition • Start adjustment 20 minutes or more after the power is equipped with the floating balanced power amplifier.
... (Rch) so that the DC voltage of this unit must be connected to +8.0 mV 19 R ch VR101 DC +4.0 to +8.0 mV CB75 CB55 Front side Fig. 1 A-S2000 CB75 DC +4.0 to +8.0 mV CB55 DC +4.0 to the speaker terminal of CB75 (Lch)/CB55 (Rch) becomes +4.0 to +8.0mV. (Fig. 1) DIʣʗ$#ʢ3DI N7... (1) P.C.B. (Side A) R ch VR101 MAIN (2) P.C.B. L ch VR201 MAIN (1) P.C.B. Condition • Start adjustment 20 minutes or more after the power is equipped with the floating balanced power amplifier.
Service Manual
Page 29
...ݪҼ 08ʢ7ʣ 13*-ʢ'30/5 1 13*3ʢ'30/5 1 13*-ʢ."*/1 DIʣ 13*3ʢ."*/1 3DIʣ A-S2000 • TMP protection L/Rch Cause : Abnormal temperature of heat sink Normal value : 0.200 to 1.550V Detection port : THML (FRONT P.C.B. 1 pin...PSVA1 (CB24 and CB26 of power transformer) PSVA2 (±B1, ±B2, ±B3 and ±B4 of MAIN P.C.B.) • Amplifier DC voltage protection L/Rch Cause : Abnormal DC voltage of FUNCTION P.C.B.) turns on. At this unit with a failure un-repaired and the ...
...ݪҼ 08ʢ7ʣ 13*-ʢ'30/5 1 13*3ʢ'30/5 1 13*-ʢ."*/1 DIʣ 13*3ʢ."*/1 3DIʣ A-S2000 • TMP protection L/Rch Cause : Abnormal temperature of heat sink Normal value : 0.200 to 1.550V Detection port : THML (FRONT P.C.B. 1 pin...PSVA1 (CB24 and CB26 of power transformer) PSVA2 (±B1, ±B2, ±B3 and ±B4 of MAIN P.C.B.) • Amplifier DC voltage protection L/Rch Cause : Abnormal DC voltage of FUNCTION P.C.B.) turns on. At this unit with a failure un-repaired and the ...
Service Manual
Page 37
...SCHEMATIC DIAGRAM D301 PRV D306 R CH +B2/-B2 for COLD IC51 IC52 PSVA1 PSVA2 +12V to POWER AMP. A B C D E F G H I J A-S2000 1 I BLOCK DIAGRAM BALANCE • See page 59 → SCHEMATIC DIAGRAM CD BAL L/R HOT (POSITIVE PHASE) BUFFER AMP. COLD(-) RY401 IC413 IC302 IC303 RY403 ...FLOATING BALANCED POWER AMPLIFIER FRONT • See page 64-66 → SCHEMATIC DIAGRAM SPEAKER DRIVER HOT (POSITIVE PHASE) SIDE SPCH A L/R CH RY201/R111 SPCH B...
...SCHEMATIC DIAGRAM D301 PRV D306 R CH +B2/-B2 for COLD IC51 IC52 PSVA1 PSVA2 +12V to POWER AMP. A B C D E F G H I J A-S2000 1 I BLOCK DIAGRAM BALANCE • See page 59 → SCHEMATIC DIAGRAM CD BAL L/R HOT (POSITIVE PHASE) BUFFER AMP. COLD(-) RY401 IC413 IC302 IC303 RY403 ...FLOATING BALANCED POWER AMPLIFIER FRONT • See page 64-66 → SCHEMATIC DIAGRAM SPEAKER DRIVER HOT (POSITIVE PHASE) SIDE SPCH A L/R CH RY201/R111 SPCH B...
Service Manual
Page 59
....7 6.4 5.8 5.8 6.4 5.8 5.8 0 0 0.3 0.3 0.3 25.2 24.7 1.0 25.7 1.0 0.4 0.4 1.0 1.0 0.5 -0.2 0 -0.7 -25.1 -24.5 -0.2 -0.7 -25.4 -25.7 -24.5 -25.0 F G H CD BAL L 12.6 0 IC201 0 0 -12.5 0 IC201 0 0 -11.9 -11.9 I J K L M N A-S2000 W2001 CB203 Page 66 H2 to FRONT (12)_CB59 Page 62 H8 to FUNCTION (3)_W3 CB201 CB202 Page 60 K2 to FUNCTION (1)_W3005 Page 60... K2 to FUNCTION (1)_W3006 IC201: NJM2068MD-TE2 Dual operational amplifier OUT1 1 -IN1 2 +IN1 3 -VCC 4 +- +- 8 +VCC 7 OUT2 6 -IN2 5 +IN2 # ...
....7 6.4 5.8 5.8 6.4 5.8 5.8 0 0 0.3 0.3 0.3 25.2 24.7 1.0 25.7 1.0 0.4 0.4 1.0 1.0 0.5 -0.2 0 -0.7 -25.1 -24.5 -0.2 -0.7 -25.4 -25.7 -24.5 -25.0 F G H CD BAL L 12.6 0 IC201 0 0 -12.5 0 IC201 0 0 -11.9 -11.9 I J K L M N A-S2000 W2001 CB203 Page 66 H2 to FRONT (12)_CB59 Page 62 H8 to FUNCTION (3)_W3 CB201 CB202 Page 60 K2 to FUNCTION (1)_W3005 Page 60... K2 to FUNCTION (1)_W3006 IC201: NJM2068MD-TE2 Dual operational amplifier OUT1 1 -IN1 2 +IN1 3 -VCC 4 +- +- 8 +VCC 7 OUT2 6 -IN2 5 +IN2 # ...
Service Manual
Page 60
A B C D E F G H I A-S2000 1 FUNCTION 1/3 2 3 Page 65 M5 to FRONT (10)_W1002 CB301 4 5 6 12.0 -11.9 -11.9 -11.9 -11.8 -11.9 -11.9 -11.9 CD L 24.6 25.7 6.4 25.1 24.6 0.9 24.6 1.1 5.8 5.8 5.8 0 0.3 0.3 5.8 0 0.3 0.1 0.9 24.6 25.6 1.0 0 5.8 6.3 0.3 0.3 5.8 0 0.3 -0.4 -0.1 0.5 1.1 0.9 0.2 1.1 0.5 ... W3004 CB305 FUNCTION (1) Page 64 B5 to FRONT (1)_CB519 Page 65 B5 to FRONT (10)_W1003 M N IC301: NJM2068MD-TE2 Dual operational amplifier OUT1 1 -IN1 2 +IN1 3 -VCC 4 +- +- 8 +VCC 7 OUT2 6 -IN2 5 +IN2 IC302, 303: OP275GSR Dual bipolar/JFET, audio operational...
A B C D E F G H I A-S2000 1 FUNCTION 1/3 2 3 Page 65 M5 to FRONT (10)_W1002 CB301 4 5 6 12.0 -11.9 -11.9 -11.9 -11.8 -11.9 -11.9 -11.9 CD L 24.6 25.7 6.4 25.1 24.6 0.9 24.6 1.1 5.8 5.8 5.8 0 0.3 0.3 5.8 0 0.3 0.1 0.9 24.6 25.6 1.0 0 5.8 6.3 0.3 0.3 5.8 0 0.3 -0.4 -0.1 0.5 1.1 0.9 0.2 1.1 0.5 ... W3004 CB305 FUNCTION (1) Page 64 B5 to FRONT (1)_CB519 Page 65 B5 to FRONT (10)_W1003 M N IC301: NJM2068MD-TE2 Dual operational amplifier OUT1 1 -IN1 2 +IN1 3 -VCC 4 +- +- 8 +VCC 7 OUT2 6 -IN2 5 +IN2 IC302, 303: OP275GSR Dual bipolar/JFET, audio operational...
Service Manual
Page 61
A B C D E F G H I J K L M N FUNCTION 2/3 1 A-S2000 12.5 12.5 0 0 0 0 0 0 0 0 0 2 3 4 IN L 5 CB401 Page 60 K6 to FUNCTION (1)_W3002 CB402 Page 60 K4 6 to FUNCTION (1)_W3001 7 8 9 10 -12.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 IC410 0 0 0 0 0 0 0 0 0 0 12.5 0 IC404 0 0... (1)_CB517 CB405 Page 63 A3 to MAIN (1)_W102 FUNCTION (2) IC401-406: OP275GSR Dual bipolar/JFET, audio operational amplifier OUT A 1 -IN A 2 +IN A 3 V- 4 8 V+ 7 OUT B 6 -IN B 5 +IN B IC413: NJM2068MD-TE2 Dual operational amplifier OUT1 1 -IN1 2 +IN1 3 -VCC 4 +- +- 8 +VCC 7 OUT2 6 -IN2 5 ...
A B C D E F G H I J K L M N FUNCTION 2/3 1 A-S2000 12.5 12.5 0 0 0 0 0 0 0 0 0 2 3 4 IN L 5 CB401 Page 60 K6 to FUNCTION (1)_W3002 CB402 Page 60 K4 6 to FUNCTION (1)_W3001 7 8 9 10 -12.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 IC410 0 0 0 0 0 0 0 0 0 0 12.5 0 IC404 0 0... (1)_CB517 CB405 Page 63 A3 to MAIN (1)_W102 FUNCTION (2) IC401-406: OP275GSR Dual bipolar/JFET, audio operational amplifier OUT A 1 -IN A 2 +IN A 3 V- 4 8 V+ 7 OUT B 6 -IN B 5 +IN B IC413: NJM2068MD-TE2 Dual operational amplifier OUT1 1 -IN1 2 +IN1 3 -VCC 4 +- +- 8 +VCC 7 OUT2 6 -IN2 5 ...