Konica Minolta bizhub C650 Service Manual page 754

Field Service Ver. 8.0 Jun. 2008
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
ADF
2
3 Scanner rails
4 Drive cables
Scanner assy
5
6
AA
AA AA
Check item
Original does not lie flat.
ADF 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.
18. Image quality problem
4036fs4032c0
Result
YES Change original.
YES Change ADF 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.
→ Change scanner relay board.
NO Change CCD unit.
Action
699