:Transformer(7106)DCcurrentdetectionDC biasDCbiasONcommandCOPYRIGHT © 1994 CANON INC.control circuitcommand(HVPHO)SAAN OPERATIONS AND TIMING esiPrimarychargingrollerTransformer(T103) Photo-sensitivedrumOscillationcontrol circuitCurrentdetectioncircuitACbiasONcommandMicroprocessorDC controller/DC power supply PCBFigure 3-16CANON PC300/320/325,FC210!290 REVO JULY 1994 PRINTED IN JAPAN (MPRIMEAUJAPON} 3-19