Printer 4-Color: Void Areas, White Spots - Olivetti d-Color MF651 Service Manual

22. IMAGE QUALITY PROBLEM
22.3.34

Printer 4-color: void areas, white spots

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Image check
2
3 Transfer belt unit Fingerprints, oil, or other foreign
4
5 Transfer roller
unit
6
7 Paper path
8
9
898
Void areas
Check item
There are void areas at the front
side or high density section.
There are void areas in the trailing
edge.
matter is evident on the transfer
belt.
Transfer belt is dirty or scratched.
Transfer roller is dirty or scratched.
Charge neutralizing needle is not
separated and ground terminal is
connected properly.
There is foreign matter on paper
path.
Pre-image transfer guide plate is
damaged or dirty.
The problem has been eliminated
through the checks of steps up to 8.
Service Manual
Field Service Ver. 2.0 Jul. 2009
White spots
Result Action
YES See P.896
YES Perform [Transfer Adjust] of
[Image Process Adjustment]
under Service Mode.
YES Clean with specified solvent.
(See Maintenance.)
YES Clean dirty belt with a soft cloth.
Change transfer belt unit if belt is
damaged.
YES Change 2nd image transfer roller
unit.
NO Correct or change.
YES Remove foreign matter.
YES Clean or change.
NO Change transfer belt unit.
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