9. E013CHAPTER 11 TROUBLESHOOTING11-87COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CauseWaste tonerfeeding screw(locked)MSW4DC controllerPCBHarness ofvertical pathroller driveclutch (CL15)ChecksIs the waste toner feeding screwdrive gear pushing the wastetoner feeding screw lockeddetecting switch (SW4)?Is the voltage between J114-B1(+) and J114-B2 (–) on the DCcontroller PCB about 5 V whenthe switch is pressed and about 0V when released?Does the harness of the verticalpath roller drive clutch have anopen circuit?Step123YES/NOYESNOYESYESActionThe feeding screw insidethe waste toner pipe islocked for some reason.Remove the waste tonerpipe, and try turing thescrew by hand. If it canbe rotated easily, installit and see if the problemhas been corrected;otherwise, replace thewaste toner pipe, andremove the cause.Replace MSW4.Replace the DCcontroller PCB.Replace the clutch(SL15).