Canon IR5000 - iR B/W Laser, Service Manual

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CANON iR5000/iR6000 REV.0 JULY 2000 2000 2000 2000 2000 COPYRIGHT © 2000 CANON INC.
CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
4-2 T
1.5 Checking the Developing Assembly
1) Check to make sure that the rolls on both ends of the developing assembly are in contact
with the drum.
Otherwise, “light images” may occur.
2) Check to make sure that the surface of the developing cylinder is coated with an even
layer of toner.
Otherwise, “light images” or “uneven density” may occur.
1.6 Checking the Paper
1) Check to see if the paper is of a recommended type.
Advise the user that the use of paper not of a recommended type may not bring abut the
best image quality.
2) Check to find out if the paper is moist.
Try using paper fresh out of package.
Advise the user that the use of moist paper will adversely affect transfer, generating poor
images. Advise him/her on the correct method of storing paper.
1.7 Checking the Periodically Replaced Parts
Check with the Scheduled Servicing Chart and the Periodically Replaced Parts Table; if
any part has reached the end of its life, replace it.
1.8 Image Adjustment Basic Procedure
If the prints have uneven density (difference in density between front and rear), light im-
ages, or foggy background, perform the Image Adjustment Basic Procedure.
1.9 Others
Bringing in a machine from a cold to warm room in winter for installation can cause con-
densation inside the machine, leading to various problems.
Memo
1. Condensation in the scanner (glass, mirror, lens) can cause dark images.
2. Condensation in the charging system can cause electrical leakage.
3. Condensation on the pickup/feeding guide plate can cause paper feed-
ing faults.
If condensation is noted, dry wipe the parts, or leave the machine alone
while powered for 60 min or so.
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