Printer Monocolor: Void Areas, White Spots - Konica Minolta bizhub C350 Service Manual

Image quality problem
4.3.20

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 envi-
6 ronment
7
4-78
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 5.
bizhub C350 Field Service Ver2.0 Sep. 2004
White spots
4036fs4051c0
Result
☞ 4-72
YES
YES Perform "2nd Transfer Adjust" of
"Image Adjust" under Tech. Rep.
mode.
YES Change Imaging Unit.
YES Clean.
YES Remove foreign matter.
YES Make the following adjustment:
"Tech. Rep. Mode" → "Image
Adjust" → "Bias Voltage Choice."
NO Change Imaging Unit.
Action