Yamaha YST-SW320 Service Manual

Also see for YST-SW320: Owner's manual Service manual

Contents

A B C D E F G H123456I J K78YST-SW320 SCHEMATIC DIAGRAMV O12–Vm 13+Vm 14V EE5+Vm26–Vm 27V O28V CC9V CC11– +– +2IC1, 4, 7—9 : μPC4570HADual OP-AmpIC5 : M51848LCR Timer* All voltage are measured with a 10MΩ/V DC electric volt meter.* Components having special characteristics are marked Z andmust be replaced with parts having specifications equal to thoseoriginally installed.* Schematic diagram is subject to change without notice.2SK304 (E, T) NJM4558LμPC1237HAM51848LμPC4570HA191SS133S2L20U1SR139-400MTZJ3.6BMTZJ12.0CMTZJ24.0BAnodeCathode BCE2SA970 (GR, BL)2SA1015 (Y)2SA1145 (O, Y)2SC1815 (Y, GR)2SC2240 (GR, BL)2SC2705 (O, Y)2SC2878 (A, B)RBV-602DG S2SA1492Z (O, P, Y)2SC3856Z (O, P, Y)2SC4688 (R, O)PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.14L.P.F.L.P.F.L.P.F.H.P.F.B.P.F.LIMITERPRE DRIVE POWER DRIVE PS AMPPROTECTIONPOWER SUPPLYA.N.I.CPOWER SUPPLYSUBPOWER SUPPLYAUTO POWER ON/OFFCIRCUIT00 011.83.43.42.7 5.9-0.1000.600-0.1000-11.9000-11.900011.800 1.8000.67.97.30 00-11.900011.8AC 97.6VAC 25.9VAC 11.2V011.55.65.611.50.900.711.507.903.97.96.703.96.61.3007.501.36.67.95.37.57.57.900-16.4 16.4016.4 11.80-16.4 -11.96.66.000011.800-0.3-0.3-11.90000-11.9000011.800-1.50 0 00 0.10.1 0.1-11.9 11.800000 0-62.5 -61.9-61.8 -61.9-62.5-61.4-61.8-61.4-1.6-61.4-61.8 -61.80 0.20.70.761.662.162.962.461.6 61.662.11.7-1.0-1.61.71.71.14.263.1 63.13.61.13.60.60.62.63.262.6063.163.0 62.662.7 62.763.162.463.12.62.663.10063.162.462.4000-2.7-62.3-3.2-0.5-0.5-1.0-62.8-3.6-3.6-1.0-4.2-62.8-1.6-62.8-62.3-62.9-63.4-62.862.8-63.1 -63.4-62.8-2.6-2.6-2.7 0-62.83.300.702.00006.66.00.724.363.100-62.84.2IDLING CURRENT ADJ.DC 50mV to 250mVAB+–BCE2SA18372SC479318IC11 : NJM4558LDual OP-Amp–IN 12+IN13–VCC4+IN25–IN 26OUT27+VCC8OUT 11–+–+IC3 : μPC1237HAProtector IC for Power Amplifier125 3 47 86OverloaddetectMid-pointpotentialdetectFlip flopcircuitVcc onmuteAC OFFdetectLatch / automaticreturn selectRelaydrivecircuitGNDVccGND 641 2 3TRIGGEROUTRESETREFERENCEVOLTAGETHRESHOLDDISCHARGEVCC7 8+–FLIP-FLOP+–5R R RS1NB20+ –2SC1846SE C B1 2 31:OUTPUT2:COMMON3:INPUTNJM78L08ABC ENJM78M12FA NJM79M12FA1: OUTPUT2: COMMON3: INPUT 3 2 11:COMMON2:INPUT3:OUTPUT 3 2 1