Scanner System: Uneven Density - Konica Minolta bizhub C650 Service Manual

Field Service Ver. 8.0 Jun. 2008
18.3.14

Scanner system: uneven density

A. Typical faulty images
B. Troubleshooting procedure
(1) When the original glass is used
Step Section
2nd/3rd mirrors
carriage
1
Scanner motor
2
3
(2) When the ADF is used
Step Section
ADF read
1
position
Guide support
for the original
2
glass moving
unit
Original glass
3
moving unit
4036fs4043c0
Check item
Scanner assy is not properly
aligned with 2nd/3rd mirrors car-
riage.
Scanner motor turns smoothly.
The problem has been eliminated
through the checks of steps up to 2.
Check item
The uneven density occurs when
reading the original from ADF.
Guide support is tilted.
The original glass moving unit is
tilted.
18. Image quality problem
4036fs4044c0 4036fs4045c0
Result
YES Perform "Focus positioning of the
scanner and 2nd/3rd mirrors car-
riage" and "Scanner Position
Adjustment."
NO Change belt.
Change scanner motor.
NO Change scanner assy.
Change CCD unit.
Result
YES Readjust.
YES Readjust.
YES Readjust.
Action
Action
707