21. The copy is blank.22. The copy is solid black.COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)10-62CHAPTER 10 TROUBLESHOOTINGChecksIs the drum cartridge securelyinserted?Is the drum cartridge rotatingduring copying operation?Is the transfer charging rollersecurely inserted?Is electrical leakage noted onthe transfer charging roller?Is the reading in ‘No. 105’ ofservice mode (primary charg-ing current) 10 μA or less?CauseDrum cartridgeDrum driveassemblyTransfer charg-ing assemblyCompositepower supplyPCBStep12345ResultsNONONOYESYESActionInsert the drumcartridge.1. Check if thephotosensitive drumrotates smoothly.2. Check the drum driveassembly.Re-insert the transferroller.Check the transfercharging roller.Replace the compositepower supply PCB.ChecksDoes the scanning lamp remainon during copying operation?Does the pre-exposure lamp turnon during copying operation?Is the reading in ‘No. 105’ ofservice mode (primary chargingcurrent) 10 μA or less?CauseCompositepower supplyPCBStep123ResultsNONOYESActionMake checks accordingto the descriptions under“The scanning lamp failsto turn on.”Make checks accordingto the descriptions under“The pre-exposure lampfails to turn on.”Replace the compositepower supply PCB.
