46. The hopper motor (M11) fails to operate.47. The drum heater fails to operate.CHAPTER 11 TROUBLESHOOTING11-110 COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CauseToner leveldetection PCBDC controllerPCBJ770, J720ChecksDoes the hopper motor rotatewhen ‘HPPR_MTR’ is executed inservice mode ( )?Does bit 10 of ‘P002’ in servicemode ( ) indicate '0' (tonerabsent)?When the hopper motor is turnedby executing ‘HPPR-MTR’ in ser-vice mode ( ), does the volt-age between J105-A3 (+) andJ105-A4 (–) on the DC controllerPCB change to about 0 V?Is the connection of the relay con-nectors J770 and J720 secure?]4]]2]]4]Step1234YES/NONOYESNONOActionGo to step 3.If there is toner in thedeveloping assembly,replace the toner leveldetection PCB.Replace the DC con-troller PCB.Connect the connectorssecurely.CauseDC controllerPCBJ7AC driverDrum heater(H3)Drum heatercontroller PCBChecksOpen the front door, and releasethe fixing/feeding assembly. Is theend of the drum warm? (Do NOTtouch the surface of the drum.)Set the meter to the 12VDCrange, and connect the probes ofthe DC controller PCB to J102-B2(+) and J102-B1 (–) on the DCcontroller PCB. Does the voltagebetween terminals change to 5 Vduring copying and to 0 V duringstandby?Is the relay connector J7 connect-ed securely?Replace the AC driver. Is theproblem corrected?Remove the drum, and set themeter to the Ω×1 range. Does theindex of the meter swing when itsprobes are connected to bothterminals of the heater?Step12345YES/NOYESNONOYESNOYESActionThe drum heater is oper-ating normally.Replace the DC con-troller PCB.Connect the connectorsecurely.End.Replace the drumheater.Replace the drum heatercontroller PCB.
