5-14
COPYRIGHT © 2005 CANON ELECTRONICS INC. CANON DR-2580C FIRST EDITION APR. 2005
CHAPTER 5 TROUBLESHOOTING
2
Uneven density, streaks (main-scanning direction)
Cause/Faulty
location
Step Check
Item Result
Action
1 Are the roller unit and retard
roller properly installed?
NO
Install them properly.
Roller
2
Are they dirty or deformed?
NO
Clean or replace them.
Gear, belt
3
Does it turn smoothly?
NO
Adjust assembling or re-
place parts.
Motor (M1, M2)
4
Is the problem solved when the
motor is replaced?
YES End.
Reading unit
5
Is the problem solved when the
reading unit is replaced?
YES End.
Control PCB
6
Is the problem solved when the
control PCB is replaced?
YES End.
Table 5-302
3
Uneven density, streaks (sub-scanning direction)
Cause/Faulty
location
Step Check
Item Result
Action
Reading glass
1
Is the reading glass clean?
NO
Clean it.
If necessary, clean the
roller too.
2
Is the shading plate clean?
NO
Clean it.
Shading plate
3 Does the reading unit (lower)
move when the power is turned
ON?
NO Check the mechanism
related to the movement
of the reading unit (lower).
Reading unit
4
Is the problem solved when the
reading unit is replaced?
YES End.
Control PCB
5
Is the problem solved when the
control PCB is replaced?
YES End.
Table 5-303
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