4-Color: Void Areas, White Spots - Konica Minolta magicolor 7450 Service Manual

Field Service Ver. 1.0 May 2006
16.3.20

4-Color: void areas, white spots

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
Image Check
1
2
Transfer Belt
3
4
5 Transfer Roller
6
Paper path
7
8
9
Void areas
4036fs4050c0
Check Item
There are void areas at the front
side or high density section.
There are void areas in the trailing
edge.
Fingerprints, oil, or other foreign
matter is evident on the Transfer
Belt.
Transfer Belt is dirty or scratched.
Transfer Roller is dirty or scratched. YES Change Image Transfer Roller.
Charge Neutralizing Cloth 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.
16. Image quality problem
White spots
4036fs4051c0
Result
YES P.233
YES Perform [TRANSFER POWER]/
[1'ST TRANSFER] under Ser-
vice Menu.
YES Clean with specified solvent.
(See Maintenance.)
YES Clean dirty belt with a soft cloth.
Change Transfer Belt belt is
damaged.
NO Correct or change.
YES Remove foreign matter.
YES Clean or change.
NO Change Transfer Belt.
Action
235