Konica Minolta bizhub C200 Service Manual page 395

19. Image quality problem
19.3.33 Printer 4-color: incorrect color image registration
A. Typical faulty images
B. Troubleshooting procedure
Step Section
Warning display The maintenance call mark is
1
Machine
2 condition
Transfer belt
3
unit
4
5
Imaging unit
6
7 Transfer roller
unit
8
Machine
→ Fusing Trans-
9
port Speed
(Service Mode)
Machine
→ Color regis-
10 tration Adjust-
ment
(Service Mode)
11
356
AA
AA AA
Check item
displayed on the panel.
Vibration is given to the machine
after main power switch has been
turned ON.
Fingerprints, oil, or other foreign
matter is evident on the transfer belt.
Transfer belt is dirty or scratched.
Drive coupling to the machine is
dirty.
The surface of the PC drum is
scratched.
Transfer roller is installed properly.
Transfer roller is dirty or scratched.
Brush effect or blurred image
occurs.
Check the specific color in which
color shift occurs.
The problem has been eliminated
through the checks of steps up to 10.
Field Service Ver. 1.0 Jun. 2008
Result Action
YES Take action according to the
warning code shown on the state
confirm screen.
YES Turn off the main power switch
and turn it on again more than 10
seconds after.
YES Clean.
YES Clean dirty belt with a soft cloth.
Change transfer belt unit if belt is
damaged.
YES Clean.
YES Change imaging unit.
NO Reinstall.
YES Change transfer roller unit.
YES Readjust fusing transport speed.
YES Perform "Color registration
Adjustment." If color shift is not
corrected even with a correction
of ± 1 dot, go to next step.
NO Change transfer belt unit.
→ Change printer control board
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