Printer Monocolor: Uneven Density In Main Scan Direction - Konica Minolta bizhub C650 Service Manual

Field Service Ver. 8.0 Jun. 2008
18.3.18

Printer monocolor: uneven density in main scan direction

A. Typical faulty images
B. Troubleshooting procedure
Step Section
Machine
→ LD adjust-
ment → LD
1
lightness bal-
ance adjust.
(Service Mode)
Imaging unit
2
3
PH unit
4
Transfer roller
5
Transfer belt unit Transfer belt unit makes positive
6
7
8
4036fs4046c0
Check item
The problem has been eliminated
through the LD lightness balance
adjust.
The surface of the PC drum is
scratched.
Dirty on the outside.
The surface of the PH window is
dirty.
Check that the spring does not
come off during the pressure oper-
ation of the transfer roller.
contact with plates on rails.
Is abnormality found in the cam
gear?
The problem has been eliminated
through the checks of steps up to 6.
18. Image quality problem
4036fs4047c0
Result Action
NO Go to next step.
YES Change imaging unit.
YES Clean.
YES Clean with cleaning jig.
NO Correct.
Change transfer roller unit.
NO Check and correct contacts.
YES Change image transfer belt unit.
NO Change imaging unit.
→ Change PH unit.
→ Change high voltage unit/2.
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