37. The scanner fails to rotate forward.38. The scanner fails to move in reverse.COPYRIGHT © 1997 CANON INC. CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 10 TROUBLESHOOTING10-96CauseCableScanner pathScanner motor(M3)DC controllerPCBChecksIs the scanner drive cable routedcorrectly?Is the scanner rail free of dirt, anddoes the scanner move smoothlywhen pushed by hand?Set the tester range to 12 VDC,and connect the probes of thetester to the following. Does thevoltage change as indicated whenthe Copy Start key is pressed?Step123YES/NONONOYESNOActionRoute the cablecorrectly.Check the scanner railfor dirt and foreign objectand look for an objectthat may come intocontact with the scanner;as necessary, clean, oil,or repair.Reference:If the rail surface issoiled, clean with alco-hol and apply a smallamount of lubricant.Replace the scanner.motor.Check the wiring fromthe DC controller PCB tothe scanner motor; ifnormal, replace the DCcontroller.+ – VoltageM3ON J112B-6 J112B-3 about 0V→5VM3F/R J112B-7 J112B-3 0V→about5V→0VCauseDC controllerPCBScanner motor(M3)ChecksDoes the scanner move forward?Set the tester range to 12 VDC.Does the voltage between J112B-7 (+) and J112B-3 (–) on thescanner motor controller PCBchange to about 5 V when thescanner has moved forward?Step12YES/NONONOYESActionSee "The scanner failsto move forward."Replace the DCcontroller PCB.Check the wiring fromthe DC controller PCB tothe scanner motor; ifnormal, replace thescanner motor.
