Printer Monocolor: Uneven Density In Cd - Konica Minolta Bizhub C350 Service Manual

bizhub C350 Field Service Ver. 2.0 April 2004
4.3.16

Printer Monocolor: uneven density in CD

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
Imaging Unit The surface of the PC Drum is
1
scratched.
2 Dirty on the outside.
LPH Assy The surface of the lens array is
3
dirty.
Image check Monocolor uneven image (uneven
4 high density) occurs.
Image Transfer Image Transfer Belt Unit makes
5
Belt Unit positive contact with plates on rails.
6 Cam gear operates properly.
The problem has been eliminated
through the checks of steps up to 5.
7
4036fs4046c0
Check Item Result
YES Clean.
4-71
Image quality problem
4036fs4047c0
Action
YES Change Imaging Unit.
YES Clean with cleaning jig.
YES Select "Tech. Rep. Mode" →
"Machine Adjust" → "LPH Rank"
and run "LPH Rank."
NO Check and correct contacts.
NO Change Image Transfer Belt Unit.
NO Change Imaging Unit.
→ Change Image Transfer Belt
Unit.
→ Change High Voltage Unit/2
(Developing Bias).
→ Change High Voltage Unit/1
(Image Transfer, Neutralizing).