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4.
Uneven density (front side dark)
5.
Uneven density (front side light)
Cause/Problem
Procedure
area
Primary
1
corona wire
height
Developing
2
assembly
Dirt on the
3
scanner
Pre-exposure
4
lamp unit
Developing
5
assembly
Corona as-
sembly and
copy paper
Check
Does the image quality improve after the
basic adjustment procedure is followed?
Is the spacer roller of the developing as-
sembly pressing against the photosensitive
drum?
Does the image improve after the scanning
lamp, reflectors, side reflectors, lens and
dust-proofing glass are cleaned?
Does the pre-exposure lamp go ON during
copying?
Is the surface of the developing cylinder
coated uniformly with toner density?
CHAPTER 4 IMAGE TROUBLESHOOTING
Result
Yes
No
Yes
No
No
Yes
Action
End.
Check the pressure ap-
plying mechanism of the
developing assembly.
End.
1.Replace the pre-expo-
sure lamp unit.
2.Replace the DC con-
troller PCB.
1.Clean the edge of the
blade of the develop-
ing assembly.
2.If the problem is in the
black developing as-
sembly, wipe the sur-
face of the developing
cylinder with a dry
cloth.
3.If the problem is in the
CT unit, try putting the
CT unit in the storage
box and shaking it vig-
orously. If the image
does not improve, re-
place the CT unit
1.Clean all the corona
wires once more; then
recheck the position of
each corona wire.
2.Try changing the copy
paper.
4-7
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Table of Contents
Troubleshooting
