Canon NP6621 Service Handbook

Also see for NP6621: Service manual Service manual

4–11TROUBLESHOOTING MALFUNCTIONSCauseDrumcartridgeBeltMain driveassemblyStep123ChecksIs ‘E010’ indicated?Re-install the drum cartridge. Is theproblem corrected?Is the drive belt correctly attached?RemedySee “E010.”End.Re-attach the belt.Remove the main driveassembly, and correct orreplace the associated partsas necessary.Yes/NoYESYESNOYES18 The photosensitive drum fails to rotate.CausePaper incassetteCassettePick-upclutch (CL2/CL5)Pick-uproller, Pick-up separa-tion padDC control-ler PCBStep12345ChecksIs the paper retained by the claw ofthe cassette?Slide out and then in the cassette. Isthe problem corrected?Does the pick-up roller rotate when theCopy Start key is pressed?Has the pick-up roller or the pick-upseparation pad reached its servicelife?Replace the DC controller PCB. Is theproblem corrected?RemedyAdvise the user on thecorrect ways of settingpaper.End.• Advise the user on thecorrect ways to set thecassette.Check the wiring from theconnector J312 on the DCcontroller PCB to the pick-upclutch; if normal, replace theclutch.Replace the pick-up roller/pick-up separation pad.End.Yes/NoNOYESNOYESYES19 Pick-up operation fails (from cassette).