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

bizhub C350 Field Service Ver2.0 Sep. 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
Machine condi-
2
tion
LPH Assy
3
Image Transfer
4 Belt Unit
5
6
Imaging Unit
7
Image Transfer
8
Roller Unit
9
Machine Adjust
→ Fuser Speed
10
(Tech. Rep.
Mode)
Machine Adjust
→ Color Shift
11 Correction
(Tech. Rep.
MOde)
12
AA
AA
Check Item
played on the panel.
Vibration is given to copier after
Power Switch has been turned ON.
LED retracting lever is locked in
position.
Fingerprints, oil, or other foreign
matter is evident on the Image
Transfer Belt.
Image Transfer Belt is dirty or
scratched.
Drive coupling to the copier is dirty.
The surface of the PC Drum is
scratched.
Image Transfer Roller is installed
properly.
Image 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 11.
Image quality problem
4036fs4032c0
Result
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
Action
4-93