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