49. The Add Toner indicator fails to turn on.50. The Add Toner indicator fails to turn off.CHAPTER 11 TROUBLESHOOTING11-112 COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CauseToner sensor(hopperassembly),DC controllerPCBDC controllerPCBChecksIs there toner in the hopperassembly?Select ‘P002’ in service mode( ). Move the toner aroundthe toner sensor (TS1) to exposethe sensor. Does bit 10 on themessage display indicate ‘0’ (tonerabsent)?Open the upper cover of thedeveloping assembly. Is the tonerlevel sensor blocked by toner?]2]Step123YES/NOYESNOYESYESActionGo to step 3.1. Replace the tonersensor (TS1).2. Replace the DC con-troller PCB.1. Replace the DCcontroller PCB.2. Replace the controlpanel.End.CauseTonerToner sensor(TS1)DC controllerPCB/ControlpanelChecksIs there toner at the rear of thehopper assembly?Select ‘P002’ in service mode( ). At this time, does bit 10on the message display indicate‘0’ (toner absent)?]2]Step12YES/NONOYESNOActionThe level of toner insidethe hopper is notenough. Supply toner.Replace the toner sen-sor (TS1) of the hopperassembly.1. Replace the DC con-troller PCB.2. Replace the controlpanel.
