22. The scanner fails to move forward/in reverse.23. The registration roller fails to rotate.COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)10-74CHAPTER 10 TROUBLESHOOTINGChecksIs the cable for the scanner routedcorrectly?Is the scanner rail free of dirt, anddoes the scanner move smoothlywhen pushed by hand?Set the meter to the 50V DCrange. Does the index of themeter point to 34 V when the (+)probe is connected to JJ210-5and the (-) probe is connected toJ210-6 on the composite powersupply PCB?Replace the DC controller PCB. Isthe problem corrected?Replace the scanner motor. Is theproblem corrected?CauseCableScanner pathCompositepower supplyPCBDC controllerPCBScanner motorStep12345ResultsNONONOYESYESActionRe-route the cable.Check the scanner railfor dirt and foreignmatter; in addition checkfor objects that maycome into contact withthe scanner.See “DC power supply isabsent.”End.End.ChecksPress the Copy Start key. Doesthe registration roller rotate forabout 1 sec immediately after thescanner starts to move forward?Set the meter to the 30V DCrange. Is the voltage betweenJ303-5 (+) and J303-6 (-) on theDC controller PCB change fromabout 0 V to about 24 V when theCopy Start key is pressed?CauseRegistrationrollerDC controllerPCBRegistrationclutch (CL1)Step12ResultsYESNOYESActionCheck the driveassembly of theregistration roller.Replace the DCcontroller PCB.Check the wiringbetween the DC con-troller PCB and CL1; ifnormal, replace the CL1.
