Printer 4-Color: Incorrect Color Image Registration - Konica Minolta Bizhub C350 Service Manual

bizhub C350 Field Service Ver. 2.0 April 2004
4.3.33

Printer 4-Color: incorrect color image registration

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
Warning display The maintenance call mark is dis-
1 played on the panel.
Machine condi- Vibration is given to copier after
2
tion Power Switch has been turned ON.
LPH Assy LED retracting lever is locked in
3
position.
Image Transfer Fingerprints, oil, or other foreign
4 Belt Unit matter is evident on the Image
Transfer Belt.
Image Transfer Belt is dirty or
5 scratched.
6 Drive coupling to the copier is dirty.
Imaging Unit The surface of the PC Drum is
7
scratched.
Image Transfer Image Transfer Roller is installed
8
Roller Unit properly.
Image Transfer Roller is dirty or
9
scratched.
Machine Adjust Brush effect or blurred image
→ Fuser Speed
occurs.
10
(Tech. Rep.
Mode)
Machine Adjust Check the specific color in which
→ Color Shift
color shift occurs.
11 Correction
(Tech. Rep.
MOde)
The problem has been eliminated
through the checks of steps up to 11.
12
AA
AA AA
4036fs4032c0
Check Item Result
4-93
Image quality problem
Action
YES Take action according to the
warning code shown on the State
Confirm screen.
YES Turn OFF and ON Power Switch.
NO Slide out the IU and reinstall.
YES Clean with specified solvent.
(See Maintenance.)
YES Clean dirty belt with a soft cloth.
Change Image Transfer Belt Unit
if belt is damaged.
YES Clean.
YES Change Imaging Unit.
NO Reinstall.
YES Change Image Transfer Roller
Unit.
YES Readjust Fuser Speed.
YES Perform "Color Shift Correction."
If color shift is not corrected even
with a correction of ± 1 dot, go to
next step.
NO Change Image Transfer Roller
Unit.
→ Change Image Transfer Belt
Unit.
→ Change MFP Control Board