4
The copy has uneven density (darker at front).
5
The copy has uneven density (lighter at front).
Cause
Step
Scanner
1
Clean the scanning lamp, reflecting
plate, side reflecting plate, mirror,
lens, and dust-proofing glass. Is the
problem corrected?
Primary
2
Execute service mode 402 (primary
charging
charging roller cleaning). Is the
roller
problem corrected?
Transfer
3
Execute service mode 403 (transfer
charging
roller cleaning). Is the problem cor-
assembly
rected?
4
Make several blank copies. Is the
problem corrected?
5
Is the transfer charging roller installed
securely?
6
Are the position and the condition of
the transfer charging roller pressure
spring normal?
Pre-expo-
7
Does the pre-exposure lamp remain
sure lamp
ON during copying operation?
Developing
8
Is the developing cylinder coated with
assembly
a uniform layer of toner?
Checks
IMAGE FAULTS
Yes/No
Remedy
YES
End.
YES
End.
YES
End.
YES
End.
NO
Install the charging roller
securely.
NO
Correct or replace the spring.
NO
See "The pre-exposure lamp
fails to turn ON."
NO
Take out the developing
assembly, shake it several
times, and make copies. If
the Problem is not corrected,
replace the developing
assembly.
3–7