Canon CP660 Service Manual page 293

5. Placement of Print Paper
a. Print paper must be placed in the cassette or the multifeeder tray in an appropriate
volume and in correct orientation.
b. Transparencies must be placed on the multifeeder tray in the correct orientation.
6. Checking the Durable Parts
a. Check with the consumables table, and replace parts that reached the end of their
lives.
7. Others
In winter, bringing a machine from a cold to warm place can cause condensation
inside it, leading to various problems.
a. Condensation in the original exposure system or the drum exposure system (6-facet
mirror, reflecting mirror, lens) can produce light images.
b. Condensation in the charging system can cause leakage.
c. Condensation on the pick-up/feeding guide can cause feeding faults.
d. When cold, the photo-conducting layer of the photosensitive drum inside the drum
cartridge tends to have a high resistance, causing poor contrast on prints.
e. Condensation on the surface of the intermediate transfer drum can cause ITD clean-
ing faults.
If condensation is found, dry wipe the parts, or leave the machine powered for 10 to
20 min. Opening a toner cartridge immediately after brining it in from a cold place will also
cause condensation. Instruct the user to make sure that the cartridges have become
used to the room temperature by leaving them alone (for 1 to 2 hr) before opening them.
Note:
If the reader unit is installed, it is important to find out whether the cause of the image
fault, if any, is in the reader unit or the printer unit.
• If the problem occurs when the CA-1 Chart is copied but does not occur on a test
print generated in service mode using the reader unit,
→ the cause is in the reader unit. (See the Reader Unit Service Manual.)
• If the problem occurs on the test print generated in service mode using the reader
unit.
→ the cause is in the printer unit. (See the pages that follow.)
COPYRIGHT © 1999 CANON INC.
Download free service manual at http://printer1.blogspot.com
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
10-11