Image Reading Section: Uneven Image Density - Develop INEO 161 Service Manual

17. Image quality problem
17.2.8

Image Reading Section: Uneven image density

A. Typical Faulty Images
B. Troubleshooting Procedure
Step
1 Original Glass is dirty, scratchy, worn, or damaged.
Shading sheet reading portion (the portion on the back-
2 side of the Original Glass to which Original Width Scale is
affixed) is dirty.
3 Scanner mirrors are dirty, scratchy, or damaged.
4 Exposure Lamp (LA2) is dirty.
CCD Unit lens and CCD surface are dirty or scratchy.
5 <Check Procedure>
Remove lens cover to check for possible contamination.
Exposure Lamp is abnormally lit (flickers or abnormally
6
dark) when the Power Switch is turned ON.
7 Inverter Board (PU2) connector CN1PU2 is loose.
8 CCD Board (PWB-J) connector is loose.
9 Control Board (PWB-C/C) connector is loose.
162
Check
Field Service Ver. 1.0 Apr. 2005
4011T525AA
Result
YES • Clean or change.
YES • Clean.
YES • Clean or change.
YES • Clean or change.
YES • Clean or change.
NO • Go to step 8.
YES • Reconnect.
• Change Exposure
NO
Lamp (LA2).
YES • Reconnect.
YES • Reconnect.
• Change CCD Unit.
NO • Change Control Board
(PWB-C/C).
Action