Service Manual
Page 1
...and more specifically YAMAHA Products, are continually striving to retrofit. Discharge any static electricity your body may have therefore not been restated. I CONTENTS TO SERVICE PERSONNEL 2 FRONT PANEL 2 REAR PANELS 3-5 REMOTE CONTROL PANELS 6 SPECIFICATIONS 7 INTERNAL VIEW 8 SERVICE PRECAUTIONS 9 DISASSEMBLY PROCEDURES 9-18 AMP ADJUSTMENT 19-20... the unit(s) indicated on the cover. IMPORTANT: Turn the unit OFF during disassembly and part replacement. STEREO AMPLIFIER A-S2000 SERVICE MANUAL A-S2000 IMPORTANT NOTICE This manual has been provided for the use of this buss).
...and more specifically YAMAHA Products, are continually striving to retrofit. Discharge any static electricity your body may have therefore not been restated. I CONTENTS TO SERVICE PERSONNEL 2 FRONT PANEL 2 REAR PANELS 3-5 REMOTE CONTROL PANELS 6 SPECIFICATIONS 7 INTERNAL VIEW 8 SERVICE PRECAUTIONS 9 DISASSEMBLY PROCEDURES 9-18 AMP ADJUSTMENT 19-20... the unit(s) indicated on the cover. IMPORTANT: Turn the unit OFF during disassembly and part replacement. STEREO AMPLIFIER A-S2000 SERVICE MANUAL A-S2000 IMPORTANT NOTICE This manual has been provided for the use of this buss).
Service Manual
Page 7
... 3 435 (17-1/8") Unit: mm (inch) ୯ҐɿNNʢΠϯνʣ 7 A-S2000 model C .......... U.S.A. Korean model A .......... British model G .......... European model L .......... Chinese model K .......... Australian model B .......... A-S2000 I SPECIFICATIONS I General / ૯߹ Power Supply U, C models AC 120 V, 60 Hz R, L ...20 Hz 9 dB Turnover frequency 3.5 kHz Audio Muting 20 dB (approx.) I Audio Section Minimum RMS Output Power (Power Amp. Flat position, 5 Hz to 100 kHz 0 / -3.0 dB Flat position, 20 Hz to 20 kHz 0 / ...
... 3 435 (17-1/8") Unit: mm (inch) ୯ҐɿNNʢΠϯνʣ 7 A-S2000 model C .......... U.S.A. Korean model A .......... British model G .......... European model L .......... Chinese model K .......... Australian model B .......... A-S2000 I SPECIFICATIONS I General / ૯߹ Power Supply U, C models AC 120 V, 60 Hz R, L ...20 Hz 9 dB Turnover frequency 3.5 kHz Audio Muting 20 dB (approx.) I Audio Section Minimum RMS Output Power (Power Amp. Flat position, 5 Hz to 100 kHz 0 / -3.0 dB Flat position, 20 Hz to 20 kHz 0 / ...
Service Manual
Page 13
...unit CB34 C B CB52 C B Leg D Ϩοά D D D Fig. 5 D Leg Ϩοά CB54 CB64 AMP unit R 3 6. Removal of Amplifier Unit a. Remove the frame side L. (Fig. 5) c. Remove CB21-22, CB24-26 and CB34. (Fig. 5) f. Remove 8 screws... 5) c. Remove 4 screws (A). (Fig. 5) d. A-S2000 5. f. Remove CB52, CB54, CB64 and CB405. (Fig. 5) h. 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 R together with the heat sink. Remove the bottom cover...
...unit CB34 C B CB52 C B Leg D Ϩοά D D D Fig. 5 D Leg Ϩοά CB54 CB64 AMP unit R 3 6. Removal of Amplifier Unit a. Remove the frame side L. (Fig. 5) c. Remove CB21-22, CB24-26 and CB34. (Fig. 5) f. Remove 8 screws... 5) c. Remove 4 screws (A). (Fig. 5) d. A-S2000 5. f. Remove CB52, CB54, CB64 and CB405. (Fig. 5) h. 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 R together with the heat sink. Remove the bottom cover...
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 check the amplifier unit L/R from the chassis, connect the ground point to the...When the amplifier unit L/R is removed from the bottom. (Fig. 7) 1 3 1$#Λ JH 3 3 JH 3 JHʣ AMP unit L Rubber sheet and cloth Ground lead Ξʔεઢ AMP unit R 3 Ground lead Ξʔεઢ Cloth AMP unit R 3 AMP unit L A-S2000 Fig. 7...
Then place the P.C.B. A-S2000 When checking the P.C.B.: • Remove frame panels L/R. • Put the rubber sheet and cloth over this unit, the ground of the amplifier unit L/R is also possible to check the amplifier unit L/R from the chassis, connect the ground point to the...When the amplifier unit L/R is removed from the bottom. (Fig. 7) 1 3 1$#Λ JH 3 3 JH 3 JHʣ AMP unit L Rubber sheet and cloth Ground lead Ξʔεઢ AMP unit R 3 Ground lead Ξʔεઢ Cloth AMP unit R 3 AMP unit L A-S2000 Fig. 7...
Service Manual
Page 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 +8.0 mV minute MAIN (2) P.C.B. (Side A) L ch VR201 MAIN (1) P.C.B. (Side A) R ch VR101 MAIN (2) P.C.B. L ch VR201 MAIN (1) P.C.B. I AMP ADJUSTMENT G Idling Adjustment Precaution for handling measuring instrument The ground side of the measuring instrument to be kept in floating... / %$ిѹ 10 20 +4.0 to +8.0 mV 19 Condition • Start adjustment 20 minutes or more after the power is equipped with the floating balanced power amplifier.
R ch VR101 DC +4.0 to +8.0 mV CB75 CB55 Front side Fig. 1 A-S2000 CB75 DC +4.0 to +8.0 mV CB55 DC +4.0 to +8.0 mV minute MAIN (2) P.C.B. (Side A) L ch VR201 MAIN (1) P.C.B. (Side A) R ch VR101 MAIN (2) P.C.B. L ch VR201 MAIN (1) P.C.B. I AMP ADJUSTMENT G Idling Adjustment Precaution for handling measuring instrument The ground side of the measuring instrument to be kept in floating... / %$ిѹ 10 20 +4.0 to +8.0 mV 19 Condition • Start adjustment 20 minutes or more after the power is equipped with the floating balanced power amplifier.
Service Manual
Page 28
...ON position. 6%*0 .65 108&30/ 0 0/ʹ͠·͢ɻ POWER indicator "BALANCE" knob A-S2000 "POWER ON/OFF" switch "BALANCE" knob "AUDIO MUTE" switch • List of protection information The...AMP DC protection L/R ch / 3DI Flashing 4 HP DC protection L/R ch / Flashing 5 / 3DI ໓ I SELF-DIAGNOSTIC FUNCTION G Protection Information Display When the power to this unit is turned on and the power indicator is flashing, the normal operation is not available because the protection function is indicated by following procedures. A-S2000...
...ON position. 6%*0 .65 108&30/ 0 0/ʹ͠·͢ɻ POWER indicator "BALANCE" knob A-S2000 "POWER ON/OFF" switch "BALANCE" knob "AUDIO MUTE" switch • List of protection information The...AMP DC protection L/R ch / 3DI Flashing 4 HP DC protection L/R ch / Flashing 5 / 3DI ໓ I SELF-DIAGNOSTIC FUNCTION G Protection Information Display When the power to this unit is turned on and the power indicator is flashing, the normal operation is not available because the protection function is indicated by following procedures. A-S2000...
Service Manual
Page 29
...;Ҽ 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 ampli- At this time, keep pressing down the "AUDIO MUTE" switch, set the...25V, LINE1 ±25V, LINE2 ±25V, VOL1 ±12V and VOL2 ±12V of FRONT P.C.B. • PS AMP source protection 1/2 Cause : Abnormal voltage of amplifier power source Normal value : LOW (0V) Detection port : PSVA1 (FRONT P.C.B. 48pin of microprocessor IC502) PSVA2 (FRONT P.C.B. ...
...;Ҽ 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 ampli- At this time, keep pressing down the "AUDIO MUTE" switch, set the...25V, LINE1 ±25V, LINE2 ±25V, VOL1 ±12V and VOL2 ±12V of FRONT P.C.B. • PS AMP source protection 1/2 Cause : Abnormal voltage of amplifier power source Normal value : LOW (0V) Detection port : PSVA1 (FRONT P.C.B. 48pin of microprocessor IC502) PSVA2 (FRONT P.C.B. ...
Service Manual
Page 37
...L/R RY_L1 COLD(-) IC408 ATT.5 LINE2 PB L/R LINE2 REC OUT L/R IC301 RY_L2 INPUT SELECTOR IC409 ATT.6 4 PRE OUT 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/... → 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...
...L/R RY_L1 COLD(-) IC408 ATT.5 LINE2 PB L/R LINE2 REC OUT L/R IC301 RY_L2 INPUT SELECTOR IC409 ATT.6 4 PRE OUT 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/... → 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...