11. E020CHAPTER 11 TROUBLESHOOTING11-89COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CauseHopperassemblysensorHopperConnection(betweenhopperassembly anddevelopingassembly)Toner sensorDC controllerPCBConnector(hopperassembly)Outlet(hopperassembly)ChecksRemove the upper cover of thedeveloping assembly. Is the devel-oping assembly almost overflow-ing with toner? (After the check,be sure to install the upper cover.)Is the hopper full of toner?Select ‘P002’ in service mode( ). Is bit 10 (TEP) of themessage display ‘0’ (tonerabsent)?Set ‘HPPR_MTR’ in service mode( ), and press the * key. Atthis time, does the hopper motorrotate for about 3 sec?Install the developing assembly,and set the copy count to ‘20’.Select ‘P002’ in service mode (). Does bit 9 (DTEP) on themessage display indicate ‘0’ (tonerpresent) during copying?Is the connector disconnected?Is the end of the outlet cover bent,limiting the amount of toner mov-ing from the hopper to the devel-oping assembly?]2]]4]]2]Step1234567YES/NOYESNOYESNOYESNOYESYESYESActionGo to step 6.Go to step 5.Replace the hopperassembly sensor.See “The hopper motorfails to operate.”Check to make sure thatthe hopper assemblyand the developingassembly are connectedsecurely.Replace the toner leveldetection PCB.Replace the DCcontroller PCB.Connect the connector.Replace the seal of theoutlet, and replace thehopper collars 1 and 2.
