Canon NP6251 Service Manual page 612

15., 16., 17. The copy has displaced leading edge registration.
Cause Step
Original
Copy paper
Pick-up roller
Leading edge
margin
Registration
clutch,
Registration
roller
DC controller
PCB
COPYRIGHT © 1997 CANON INC.
Checks
1 Is the original placed correctly?
2 Is the paper of a type
recommended by Canon?
3 Make copies using the paper deck
and each of the cassettes. Is the
problem noted on all copies?
4 Has the pick-up roller reached its
average life?
5 Adjust the leading edge margin. Is
the problem corrected?
6 Set the meter to the 30DC range,
and measure the voltage between
J108A-5 (+) and J108A-6 (–) on
the DC controller PCB. Does it
change from 24 to 0 V
instantaneously while the scanner
is moving forward?
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO Action
NO Place it correctly.
NO Try recommended paper.
If the results are good,
advise the user to use
recommended paper.
YES Go to step 4.
NO Check each pick-up
system.
YES If wear is noted on the
pick-up roller, replace it.
YES End.
YES 1. Check the No. 1
registration clutch.
2. Check the registration
roller for deformation
and wear.
NO Replace the DC
controller PCB.
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