6 The copy is foggy. (entire copy)11-60CHAPTER 11 TROUBLESHOOTINGCOPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CauseScannerPre-exposurelampDeveloping rollsDevelopingassemblyDrum unitLampregulatorHigh-voltagecord, high-voltage powersupply PCB,DC controllerPCB, scanninglampChecksPerform the Image AdjustmentBasic Procedure. Is the problemcorrected?Clean the scanning lamp, reflect-ing plate, side reflecting plate,mirror, lens, and dust-proofingglass. Is the problem corrected?Is the pre-exposure lamp onduring copying operation?Are the developing rolls worn?Is the developing cylinder insulat-ed from the copier GND?Turn off the power, and disconnectthe connector Dp from the high-voltage power supply PCB; then,check the length between the con-nector on the developing assem-bly side and the copier GND forelectrical continuity using a meter.Replace the drum unit. Is theproblem corrected?Replace the lamp regulator. Is theproblem corrected?Step1234567YES/NOYESYESNOYESNOYESYESNOActionEnd.End.See “The pre-exposurelamp fails to turn on.”Replace the developingrolls.Check the developingcylinder and the areaaround the developingconnector.End.End.1. Check the high-voltage cord forelectrical continuity.2. Check the high-voltage power supplyPCB and the DCcontroller PCB.3. Replace the scanninglamp.
