Canon NP6317 Service Manual page 197

15.
16. Faulty leading edge registration
17.
Cause/Problem
Procedure
area
Original 1
Copy paper 2
Pick-up roller 3
Registration 4
adjustment
Registration 5
rollers, Regis-
tration roller
clutch
DC controller
PCB
COPYRIGHT © 1999 CANON INC.
Check
Is the original set correctly?
Is copy paper recommended by Canon be-
ing used?
Is the pick-up roller soiled by paper dust,
etc.?
Does the copy improve when registration
is adjusted? (leading edge blank area)
Set the meter to the 30VDC range and
measure the voltage between J308-3 (+)
and J308-4 (-) of the DC controller PCB.
Is the voltage 24V or less during copying
and approx. 0V at other times?
CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Result
No Set the original correctly.
No Check if the recom-
mended paper is being
used. If the results are
then satisfactory, recom-
mend that the customer
use it.
Yes 1.Clean the pick-up
roller.
2.Check the total num-
ber of sheets picked up
by the pick-up roller.
If it has reached
100,000, replace the
pick-up roller.
Yes End.
Yes 1.Check the registration
rollers for deformation
and wear.
2.Check the wiring from
the DC controller PCB
to the registration
roller clutch. If it is
normal, replace the
registration roller
clutch.
No Replace the DC control-
ler PCB.
Action
10-33