B. Faulty Feeding - Canon NP6512 Service Manual

CHAPTER 11 TROUBLESHOOTING
B. Faulty Feeding
1 Double-Feeding
Cause Step
Cassette 1
2
3
Copy paper 4
Claw (cas-
sette)
2 Wrinkles
Cause Step
Pickup 1
assembly,
Vertical path
roller,
Registration
roller
Copy paper 2
3
Fixing 4
assembly
Inlet guide
11-80
COPYRIGHT © 1999 CANON INC.
Checks
Is the copy paper placed under the
claw properly?
Push down the copy paper inside the
cassette. Does it move up when let go
with its end coming under the claw?
Is the sheets of paper placed in the
cassette uneven?
Is the paper of a type recommended by
Canon?
Checks
Turn off the power while copy paper is
moving through the feeding assembly.
Is the copy paper wrinkled or found
askew?
Try fresh paper. Is the problem cor-
rected?
Try paper of a type recommended by
Canon. Is the problem corrected?
Is the inlet guide soiled with toner?
CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
YES/NO Action
NO Place the copy paper
properly.
NO 1. Check the copy
paper width.
2. Check the position
of the side guide
plate of the cassette.
(universal cassette
only)
3. Measure the force
of the spring of the
cassette; if faulty,
replace the cassette
spring.
YES Even out the sheets in
the cassette.
NO Ask the user to use
recommended paper.
YES Check the claw for
deformation.
YES/NO Action
YES • Check the pickup
assembly.
• Check the vertical
path roller.
• Check the registra-
tion roller.
YES The paper is moist.
Instruct the user on the
correct method of
storing paper.
YES Ask the user to use
recommended paper.
NO Check the fixing
assembly.
YES Clean the inlet guide
with solvent.