Caution:Take care not to damage the photosensitive drum.The photosensitive drum is highly susceptible to light, and exposure even to roomlighting can lead to white spots or black bands on the copies.As a rule, do not turn on the copier with the drum unit removed; otherwise, theregistration roller and the transfer guide will interfere with each other, and rotationof the registration roller during WMUP will damage the roller.2. CleaningIf the surface of the photosensitive drum has become soiled, clean it with a flannelcloth coated with toner; do not use paper, lint-free or otherwise.Caution:Do not dry-wipe or use solvent.Do not use drum cleaning powder.COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 4 IMAGE FORMATION SYSTEM4-40