CHAPTER 11 TROUBLESHOOTINGCOPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-10141 The Add Toner indicator fails to turn off.CauseToner sensor(TS1)DC controllerPCBScrew, gear,stirring rodChecksIs toner present around the tonersensor (TS1) at the front of thedeveloping assembly?Replace the toner sensor. Is theproblem corrected?Execute ‘409’ in service mode [4].Is the stirring rod inside thehopper rotating normally while thehopper motor is rotating?Step123YES/NNOYESNONOYESActionGo to step 3.End.Check the wiring fromthe DC controller PCB tothe toner sensor; ifnormal, replace the DCcontroller PCB.Check the screw, gear,and stirring rod to see ifthey are installedproperly.Check the shutterassembly of the tonersupply mouth betweenthe hopper and thedeveloping assembly.
