Printer Monocolor: White Lines In Fd, White Bands In Fd - Konica Minolta Bizhub C350 Service Manual

bizhub C350 Field Service Ver. 2.0 April 2004
4.3.14 Printer Monocolor: white lines in FD, white bands in FD, colored lines col-
ored bands in FD, white lines in CD, white bands in CD, colored lines in CD,
colored bands in CD
A. Typical Faulty Images
White lines in FD
4036fs4021c0
White lines in CD
4036fs4025c0
B. Troubleshooting Procedure
Step Section
Image check A white line or black line in FD is
sharp.
1
Imaging Unit The surface of the PC Drum is
2
scratched.
LPH Assy The surface of the lens array is
3
dirty.
4 Imaging Unit Dirty on the outside.
Connectors and contact terminals
5 make good connection between
each IU and LPH Assy.
Developing bias contact terminal
6
makes good connection.
Image check The problem has been eliminated
7 through the checks of steps up to 6.
The problem has been eliminated
8 through the checks of steps up to 7.
White bands in FD Colored lines in FD
4036fs4022c0
White bands in CD Colored lines in CD
4036fs4026c0
Check Item
4-69
Image quality problem
Colored bands in FD
4036fs4023c0
Colored bands in CD
4036fs4027c0
Result Action
YES Select "Tech. Rep. Mode" →
"Machine Adjust" → "LPH Chip
Adjust" and run "LPH Chip Adjust."
NO Clean the Comb Electrode by moving
the Comb Electrode Cleaning Lever.
YES Change Imaging Unit.
YES Clean with cleaning jig.
YES Clean.
NO Clean contact terminals.
Reconnect.
NO Clean contact terminal and check ter-
minal position.
Select "Tech. Rep. Mode" →
NO
"Machine Adjust" → "LPH Rank" and
run "LPH Rank."
NO Change Imaging Unit.
→ Change Image Transfer Belt Unit.
→ Change LPH Assy.
4036fs4024c0
4036fs4028c0