All Black/All White/All Streaked; Too Dark/Too Light - Canon imageFORMULA P-215 Service Manual

CHAPTER 5 TROUBLESHOOTING
Note: The level of reproducing the image depends on types of documents and setup conditions.
Changing setup conditions sometimes works.
Confirm whether it is only one side or both sides that image trouble occurs. In the case of
the one side, check an item related to the aspect.

1. All Black/All White/All Streaked

The image is all black, all white, or all streaked.
Cause/Faulty
Location
Setting 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
Location
Setup of "Brightness"
Setup of "Contrast"
Light Adjustment
5-24
Step Check Item
1 Was the document set with
the surface facing down?
If not, the reverse side will
be scanned.
2 "Brightness" setup prop-
erly?
3 Was the problem solved by
resetting the power of the
scanner or restarting the
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 prop-
erly?
Normally the brightness
should be set to the me-
dium value, but this may
need to be changed, de-
pending on the document.
2 "Contrast" setup properly?
3 Have you executed Light
Adjustment
Table 5-503
COPYRIGHT © CANON ELECTRONICS INC. 2011
Result
NO Set properly.
NO Change the setup.
Change "Contrast" if
necessary.
YES Done.
cables NO Connect properly.
YES Done.
YES Done.
Result
NO Change the setup.
NO Change the setup.
NO Execute Light Adjust-
ment
Action
Action
CANON P-215 FIRST EDITION