Printer System: Black Spots - Konica Minolta bizhub 200 Service Manual

20. Image quality problem
20.3.12

Printer System: Black spots

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
1 Paper Path
2 Imaging Unit
3 Fusing Unit
4 Imaging Unit
5
6
7 Erase Lamp
8
9 -
270
AA AA
Check Item
Toner is on the paper path.
Photo Conductor is dirty.
Fusing Rollers are dirty or scratched.
Comb Electrode contact terminal is dirty
or deformed.
Grid voltage contact terminal is dirty or
deformed.
Charge Neutralizing Sheet contact ter-
minal is dirty or deformed.
Erase Lamp is dirty.
Is there continuity across the Erase
Lamp?
The problem has been eliminated after
performing step 8.
Confidential – for internal use only, do not distribute
Field Service Ver. 2.5 Jul. 2006
4036fs4029c0
Result
YES Clean.
YES Change Photo Conductor
Unit.
YES Change Fusing Unit.
YES Clean.
Change Photo Conductor
Unit.
YES Clean.
Change Photo Conductor
Unit.
YES Clean.
Change Photo Conductor
Unit.
YES Clean.
NO Change Erase Lamp.
NO Change Photo Conductor
Unit.
Change Developing Unit.
Change High Voltage
Unit.
Change Mechanical Con-
trol Board.
Action