Printer Monocolor: Void Areas, White Spots - Konica Minolta bizhub C450 Service Manual

Field Service Ver. 1.0 Mar. 2005
18.3.20

Printer Monocolor: void areas, white spots

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
Image Check
1
2
Imaging Unit
3
4
Hopper Unit
5
Installation
environment
6
7
Void areas
4036fs4050c0
Check Item
There are void areas at the front
side or high density section.
There is void area at the rear side
section.
The surface of the PC Drum is
scratched.
Dirty on the outside.
Foreign matter or caked toner in
the Toner Cartridge.
Is the atmospheric pressure at the
installation site low?
The problem has been eliminated
through the checks of steps up to 6.
18. Image quality problem
White spots
4036fs4051c0
Result
☞ 395
YES
YES Perform "Transfer Adjust" of
"Image Process Adjustment"
under Service Mode.
YES Change Imaging Unit.
YES Clean.
YES Remove foreign matter.
YES Make the following adjustment:
"Service Mode" → "Image Pro-
cess Adjustment" → "Dev. Bias
Choice."
NO Change Imaging Unit.
Action
401