Image Troubleshooting - Canon DR-9080C Service Manual

CHAPTER 5 TROUBLESHOOTING
V. IMAGE TROUBLESHOOTING
Note 1: There are times when image trouble is due to the display device or printer. In such cases, the
problem cannot be corrected with the machine.
Note 2: There are times when, depending on the type of image and settings, document reproducibility
becomes poor. In such case, the image may be improved by changing the settings.
1 No image is output (completely white, completely black, completely grey, mottled)
Cause
'Brightness' setting
Reading glass
Shading plate
Connection of
reading unit
Reading unit
MAIN_DCON
5 - 22
Step Check Item
1 Is the 'Brightness' setting
appropriate?
2 Is the reading glass clean?
3 Is the shading plate clean?
4 Does the shading plate jumps up to
the platen roller?
5 Are J131/J132/J135 (front side)
and J136/J137/J139 (back side) of
MAIN_DCON connected properly?
Are J2/J3/J4 (front side) and
J2B/J3B/J4B (back side) of
reading unit connected properly?
6 Is the problem solved when the
reading unit is replaced?
7 Is the problem solved when
MAIN_DCON is replaced?
Table 5-501
COPYRIGHT © 2003 CANON ELECTRONICS INC. CANON DR-6080/9080C FIRST EDITION OCT. 2003
Result Action
NO Change the setting.
Also change 'Contrast'
if necessary.
NO Clean it. Also clean the
roller if necessary.
NO Clean it.
NO Check the assembly of
the shading plate and
the operation of the
shading solenoid.
NO Check all connections.
YES End.
YES End.