Canon PC980 Service Manual - Page 118

CHAPTER 4 IMAGE FORMATION SYSTEM 2. Cleaning the Drum Caution: As a rule, do not touch or clean the photosensitive drum. 1) Open the machine's top unit, and take out the cartridge. 2) Turn over the cartridge, and open the drum cover shutter 3) Clean the drum surface with a flannel cloth coated with toner. Caution: 1. If you need to rotate the drum, be sure to rotate it in the direction in which it rotates when making copies. Otherwise, the leaf spring used to apply a developing bias to the developing cylinder will develop poor contact. 2. If you must clean it, use a flannel cloth. Do not use paper, lint-free or otherwise. 3. If exposed to light for an appreciable time, the images will be affected. Be sure to work briskly. Reference: If the photosensitive drum is exposed to light of 1500 lux (ordinary lighting) for 5 min and then is left alone for 5 min in a dark place, it will recover to a level at which it will cause no practical problem. However, avoid exposing it to direct sunlight. The rays of the sun are usually about 10000 to 30000 lux. 4-24 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)