The Print Has A Blurred Image - Canon Image Reader-A1 iR5000i Service Manual

CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

3.18 The print has a blurred image

Reader unit
1) Does the problem occur only in copy images?
YES: Go to step 2).
NO:
Scanner drive cable
2) While the scanner is moving, is the cable wound on the cable pulley in
lengths laid on top of one another?
YES:
1.
2.
Scanner drive belt
3) Is the belt too taut or too slack?
YES:
1.
2.
Scanner rail
4) Move the No. 1 mirror base slowly by hand. Does it move smoothly?
YES: Check the each mirror to see if it is free of wobbling.
NO:
Photosensitive drum
5) Does the problem occur at intervals of about 250 mm?
YES:
1.
2.
Drum drive gear
6) Does the problem occur at intervals of about 3 mm?
YES: Check the drum drive gear.
Developing gear
7) Does the problem occur at intervals of about 2.5 mm?
YES:
1.
2.
Drum drive system
8) Does the problem occur at intervals of about 10 mm?
YES: Check the cleaner assembly and the drum drive system.
Laser scanner unit
9) Is the problem noted at intervals of about 0.5 mm?
YES: Check the laser scanner unit. (The polygon mirror may be faulty.)
4-16 T
Go to step 5).
Route the cable once again.
If the cable has a fault, replace it.
Attach the belt properly.
If the belt has a fault, replace it.
Clean the surface of the scanner rail, and apply a small amount of
silicone oil so that the No. 1 mirror base moves smoothly.
Check the drum gear.
Check the ends of the drum (in contact with the developing rolls)
for scratches and protrusions.
Check the developing assembly.
Check to find out if the end of the drum is coated with toner; if so,
clear it.
COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001