Yamaha YST-SW515 Service Manual

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Contents

A B C D E F G H I J K LYST-SW51513SCHEMATIC DIAGRAM123456789 All voltages are measured with a 10MΩ/V DC electronic voltmeter. Components having special characteristics are marked s and must be replacedwith parts having specifications equal to those originally installed. Schematic diagram is subject to change without notice.V INV OUTGNDIC202 NJM78L08AVoltage RegulatorIC201: LB8555DTimer1VCC 8 DISCHARGE7CONTROL VOLTAGE 5THRESHOLD 6+–TRIGGERGND2RESET 4+–RS QOUTPUT387654321OUT 1–Vcc+IN 2–IN 2OUT 2+Vcc+IN 1–IN 1IC11: NJM4558LDual OP-AmpIC6: NJM78M12FAVoltage RegulatorINPUTOUTPUTCOMMONIC4, 7, 8, 10: μPC4570HADual OP-AmpVcc Vo1 -Vm1 +Vm1 VEE +Vm2 -Vm2 Vo2 Vcc1 2 3 4 5 6 7 8 9+ + --1 2IC1: NJM79M12FAVoltage RegulatorCOMMONOUTPUTINPUT1819148OUTCOM INPIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.2SA18372SC47932SA14922SC38562SC46881SR1391SS133EL02ZLFMTZJ12CMTZJ24BMTZJ3.6BS2L20US1NB202SA10152SA11452SA9702SC18152SC22402SC27052SC2878D5SBA20 NJM4558LNJM78L08A μPC4570HA NJM79M12FANJM78M12FALB8555DAnodeCathode ~+~–+–E C B B C E B C E 1: OUT2: IN3: COM1: OUT2: COM3: INAC 12.4AC 27.9AC 102.40 11.9000011.90 0-11.80 03.43.43.42.7 -0.1-0.16.00.7 0 00 -11.800004.00.1 7.96.8 6.74.0 0000.77.3 7.90.10.11.90 05.81.4-11.8 11.90000001.9 5.96.60-11.80011.900001.46.67.97.95.65.65.369.70.769.8 69.8 69.31.8 1.83.81.81.0-1.669.870.11.21.24.44.470.167.869.570.170.10.2 0.20.7 0.7-69.6-69.6 -69.6-69.6-69.5-69.6-1.6-1.6 -1.0 -1.0-4.3-4.3-3.7-70.4-70.3-69.6 -68.9-68.9-70.3-70.3-69.6-69.600 0 0.1 0.1-11.800 00011.90.10.10 00 00000-18.2-0.1 -12.5-12.5 -12.5-0.6-5.9 018.3 18.3-18.2 -11.8-11.811.97.213.20013.213.26.20.16.10.10.10.8070.10.1 01.301.31.3 0.80.7 0.100070.1-70.30-2.7-2.7-2.7-2.7 -2.3 -70.3-70.370.170.169.669.469.470.069.669.62.73.33.41.20.60.7-0.5-0.1-0.1-0.3-3.3-3.7-70.3-70.7-70.0-70.7-70.2-70.2-70.3-70.3-70.2-69.6-2.7-2.70.10.10.169.9 70.170.1-0.62.770.170.170.10.10.12.72.72.72.72 435TIMERx: NOT USEDO: USED / APPLICABLEL.P.F.B.P.FAUTO POWER ON / OFF CIRCUITL.P.FPRE DRIVELIMITERA.N.I.CPOWER DRIVEPOWER SUPPLYPOWER SUPPLYPS AMPPROTECTIONH.P.F L.P.FSUB POWER SUPPLYPHASEB.A.S.S.HIGH CUTVOLUMEDRIVERSTANDBY/ONPOWERINPUT 1 / OUTPUTINPUT 2R273330R274330WB49370 WB49370w w w . x i a o y u 1 6 3 . c o mQ Q 3 7 6 3 1 5 1 5 0 992894298T E L 1 3 9 4 2 2 9 6 5 1 3 992894298051513673QQTEL 13942296513 QQ 376315150 892498299TEL 13942296513 QQ 376315150 892498299http://www.xiaoyu163.com