8. E0649. E202 (keys on control panel invalidated)COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON) 10-67CHAPTER 10 TROUBLESHOOTINGCauseWireCompositepower supplyPCBTransfer charg-ing assembly,Transfercharging rollerPrimarycharging rollerHigh-voltagecableChecksTurn off and on the power switch,and set ‘1’ as the copy count. IsE064 indicated after copyingoperation?Set ‘1’ as the copy count, andpress the Copy Start key onceagain. Is E064 indicated aftercopying operation?Is a fault noted in the transfercharging assembly/transfer rolleror contacts?Detach the drum cartridge, andcheck the primary charging roller.Is a fault noted in the primarycharging roller or the contacts?Detach the rear cover, and checkthe high-voltage cable. Is ascratch or crack found in the high-voltage cable?Step12345ResultsYESYESYESYESYESActionCheck the harnessbetween the DCcontroller PCB and thecomposite power supplyPCB.Go through steps 3through 6; then, replacethe composite powersupply PCB.Replace the transfercorona assembly/transferroller.Replace the drumcartridge.Replace the high-voltageterminal.ChecksIs the scanner at home positionwhen E202 is indicated?Is the scanner home positionsensor (PS1) normal? (Seedescriptions on how to checkphotointerrupters.)CauseScanner homeposition sensor(PS1)DC controllerPCB checkStep1ResultsNONOYESActionSee “The scanner fails tomove forward/in reverse.”Check the wiringbetween the DCcontroller PCB and PS1;if normal, replace PS1.Replace the DCcontroller PCB.
