Canon NP6218 Scanner fails to move forward/in reverse, Registration roller fails to rotate, 10-74

CHAPTER 10 TROUBLESHOOTING

22. The scanner fails to move forward/in reverse.

Cause	Step	Checks	Results	Action
Cable	1	Is the cable for the scanner routed	NO	Re-route the cable.
		correctly?
Scanner path	2	Is the scanner rail free of dirt, and	NO	Check the scanner rail
		does the scanner move smoothly		for dirt and foreign
		when pushed by hand?		matter; in addition check
				for objects that may
				come into contact with
				the scanner.
Composite	3	Set the meter to the 50V DC	NO	See “DC power supply is
power supply		range. Does the index of the		absent.”
PCB		meter point to 34 V when the (+)
		probe is connected to JJ210-5
		and the (-) probe is connected to
		J210-6 on the composite power
		supply PCB?
DC controller	4	Replace the DC controller PCB. Is	YES	End.
PCB		the problem corrected?
Scanner motor	5	Replace the scanner motor. Is the	YES	End.
		problem corrected?

23. The registration roller fails to rotate.

Cause	Step	Checks	Results	Action
Registration	1	Press the Copy Start key. Does	YES	Check the drive
roller		the registration roller rotate for		assembly of the
		about 1 sec immediately after the		registration roller.
		scanner starts to move forward?
DC controller	2	Set the meter to the 30V DC	NO	Replace the DC
PCB		range. Is the voltage between		controller PCB.
		J303-5 (+) and J303-6 (-) on the
Registration			YES	Check the wiring
		DC controller PCB change from
clutch (CL1)				between the DC con-
		about 0 V to about 24 V when the
				troller PCB and CL1; if
		Copy Start key is pressed?
				normal, replace the CL1.

10-74 COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)