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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
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CANON ELECTRONICS INC. 2011 CANON DR-M140 FIRST EDITION
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