Scanner System: Incorrect Color Image Registration, Sync Shift (Lines In Main Scan Direction) - Konica Minolta bizhub C450 Service Manual

18. Image quality problem
18.3.6 Scanner System: incorrect color image registration, sync shift (lines in
main scan direction)
A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
1 Original
Original Cover
2
3 Slide rails
4 Drive Cables
Scanner Assy
5
6
384
AA
AA
4036fs4032c0
Check Item
Original does not lie flat.
Original Cover does not lie flat.
Foreign matter on rails.
Cable kinks or is damaged.
Scanner moves smoothly.
The problem has been eliminated
through the checks of steps up to 5.
Field Service Ver. 1.0 Mar. 2005
Result Action
YES Change original.
YES Change Original Cover if it is
deformed or hinges are broken.
YES Clean and apply lubricant.
YES Correct or change.
NO Adjust the Scanner Motor timing
belt.
→ Change bushing.
→ Change Scanner Motor.
NO Change CCD Unit.