Olivetti d-color MF651, Service Manual, Page: 936 / 1053

22. IMAGE QUALITY PROBLEM Field Service Ver. 2.0 Jul. 2009
876
TROUBLESHOOTING
22.3.14 Scanner system: uneven density
A. Typical faulty images
B. Troubleshooting procedure
(1) When the original glass is used
(2) When the ADF is used
A02EF4C520DA
Step Section Check item Result Action
1 2nd/3rd mirrors
carriage Exposure unit is not properly
aligned with 2nd/3rd mirrors car-
riage. YES Perform “Focus positioning of the
scanner and 2nd/3rd mirrors car-
riage” and “Scanner Position
Adjustment.”
2 Scanner motor Scanner motor turns smoothly. NO Change belt.
Change scanner motor.
3 The problem has been eliminated
through the checks of steps up to 2. NO Change exposure unit.
Change CCD unit.
Step Section Check item Result Action
1 ADF read
position The uneven density occurs when
reading the original from ADF. YES Readjust.
2 Guide support
for the original
glass moving
unit Guide support is tilted. YES Readjust.
3 Original glass
moving unit The original glass moving unit is
tilted. YES Readjust.
Service Manual Y110571-1