Canon NP6621 Service Handbook page 88

TROUBLESHOOTING FEEDING FAULTS
3 Double feeding (paper deck).
Cause Step
Separation 1
roller spring
Separation 2
roller
Spring
4 Wrinkling (paper deck).
Cause Step
Copy paper 1
2
Copier 3
5–8
Checks
Change the position of the separation
roller spring. Is the problem cor-
rected?
Is the separation roller deformed or
worn?
Checks
Try fresh copy paper. Is the problem
corrected?
Try paper of a type recommended by
Canon. Is the problem corrected?
Does the paper wrinkle when a copy
is made from the copier's lower
cassette?
Remedy
Yes/No
YES End.
YES Replace the separation
roller.
NO Replace the spring used to
pull the separation roller.
Yes/No Remedy
YES The copy paper may be
moist; advise the user on the
correct method of storing
paper.
YES Advise the user to use
recommended paper.
YES Check the copier's paper
feeding system.
NO Check the pedestal's pick-up
assembly.
Check vertical path roller 3
and check vertical path roller.