COPYRIGHT © 1997 CANON INC. CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)10-40Start potential control( ; PO.CONT’0’).Measure the voltage between J114-A2and J114-A13 on the DC controllerPCB during copying. (STEP C)Check the developing assembly for leakage.Select ’BIAS’ (developing bias DCvalue) in service mode ( ).Convert the value (unit: V) indicatedduring copying into its equivalentcontrol voltage by referring to 48"Potential Control Conversion Table."Measure the voltage betweenJ114-A3 and J114-A13 on the DCcontroller PCB.Is the differencebetween the actualmeasurement of STEP C and ’BIAS’in service modewithin –10%?YESYES(developing bias DC component)(developing bias AC component)Select the primary power supplylimit indication ( ; PLMT).Is ’1’ indicated under ’PLMY’?Replace the photosensitive drum.Start non-potential control( ; PO.CONT ’1’).END.Replace the DC controller PCB.NOYESYESNOYESMeasure the voltage betweenJ114-A5 and J114-A13 on the DCcontroller PCB during copying.(primary output)Is the differencebetween the actual measurementof STEP B and ’PC’ in servicemode within –10%?Replace the DC controller PCB.NOAReplace the DC controller PCB.NOReplace the DC controller PCB.NOIs the voltageabout 5 V when the scanneris moving forward?Replace thehigh-voltage transformer.Is the problem corrected? BSelect ’GLEAM-5’ in service mode( ; Direct mode).YESDoes the indicationchange between 0.5 and 4 Vaccording to the changes in’GLEAM-5’ duringcopying?Replace the DC controller PCB.NOCheck the lamp regulator or thescanning lamp.SSEnter a value (minimum/maximum; within thespecified range), and press the ] user mode key;then, measure the voltage during copying.Ex.GLEAM-5 Reading34 ¤ 2.8V139 ¤ 3.9VSelect ’PC’ (primary chargingassembly current value) in servicemode ( ). Convert the value(unit: A) indicated during copyinginto its equivalent control voltage byreferring to 48 "Potential ControlConversion Table."] 3 ]] 1 ]] 1 ]] 1 ]] 1 ]] 4 ]
