COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)B. Remote SwitchWhen the machine’s printer unit power switch is turned off, the low-voltage power sup-ply circuit sends the power-off signal (POFF) to the DC controller PCB. Thereafter, whenthe printer unit is ready for power-off, the DC controller PCB causes the power-off con-trol signal (PCONT) to go ‘1’, thereby turning off the switching transistor of the power sup-ply circuit to stop +5 V and +24 VB power.This condition will turn off +5 R, PSAVE* and P5SAVE of the +5 V system and +24VAR and +24 UH of the +24 VB system.Figure 7-302CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS7-6DC controllerCB101+24VBPOFFDC-DCconverterFuseControl ICRegulator IC5 Vovercurrent/overvoltageFPCONT+5VS+5V+24UH/PSAVE+24VARDevelopingrotary PCB+24UHSub relayPCB +24VB+24UHPick-upPCBP5SAVE+5VLaserdriver/sensor/BD PCB+24VBP5 SAVE+24UHP5SAVE+24UHPrinterboard+5RLow-voltage power supplyACPowersupplyCircuitbreakerNoise filterRectificationcircuitAnti-rushcurrent circuitSwitchingtransistorRectificationsmoothingcircuit24 V overvoltagedetection circuitTransformer24 V overcurrentdetection circuitRectificationcircuitMain relay PCBHigh-voltagePCB 1Pre-exposureLED relayPCBPowersupplyswitchPhotocouplerPhotocouplerHigh-voltagePCB2/separationstatic eliminatorhigh-voltagePCBDownload free service manual at http://printer1.blogspot.com
