All Black/All White/All Streaked; Too Dark/Too Light - Canon imageFORMULA DR-M140 Service Manual

Note: The level of reproducing the image depends on types of documents and setup conditions.
Changing setup conditions sometimes works.

1. All Black/All White/All Streaked

The image is all black, all white, or all streaked.
Cause/Faulty
Locations
Placing documents
Setup of "Brightness"
System
Reading Unit
Control PCB

2. Too Dark/Too Light

The image cannot be seen properly because the brightness is inappropriate.
Cause/Faulty
Locations
Setup of "Brightness"
Setup of "Contrast"
Light Adjustment
COPYRIGHT © CANON ELECTRONICS INC. 2011
Step Check Item
1 Is the document placed with
the front/back around the right
way?
2 "Brightness" setup properly?
3 Was the problem solved by
resetting the power of the
scanner or
computer?
4 Reading-related
connected properly?
5 Was the problem solved by
replacing the reading unit?
6 Was the problem solved by
replacing the control PCB?
Table 5-502
Step Check Item
1 "Brightness" setup properly?
Normally middle value is fine,
but this may need to be
changed, depending on the
document.
2 "Contrast" setup properly?
3 Have you
Adjustment?
Table 5-503
CANON DR-M140 FIRST EDITION
CHAPTER 5 TROUBLESHOOTING
Result
NO
NO
YES
restarting the
cables NO
YES
YES
Result
NO
NO
executed Light NO
Action
Place properly.
Change the setup.
Change "Contrast" if
necessary.
Done.
Connect properly.
Done.
Done.
Action
Change the setup.
Change the setup.
Execute the
adjustment.
5-43