4–38 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)MECHANICAL SYSTEMV. CHARGING SYSTEMA. Drum Unit1. Removing the Drum Unit1) Open the front door.2) Pull the developing assembly releasing lever qto the front, and turn it clockwise.Figure 4-5013) Open the top body.4) Turn the knob w counterclockwise, and re-move it.5) Pull out the drum unit e slowly to the front.Figure 4-502Caution:Take extra care not to damage the photosensi-tive drum.Caution:The photosensitive drum is highly susceptibleto light, and exposure even to room lightingcould lead to white spots or black bands oncopies.As a rule, you must not turn on the copier withthe drum unit removed; otherwise, the followingcan occur:• The registration roller and the transfer guidewill interfere; rotation of the registration rollerduring WMUPR can damage the registrationroller.2. CleaningIf the surface of the photosensitive drum be-comes soiled, wipe it with a cloth coated with toner.(Do not use paper, lint-free or otherwise.)Caution:You should never dry-wipe the surface of thephotosensitive drum or use solvent on it.Do not use drum cleaning powder.13 2Download service manual and resetter printer at http://printer1.blogspot.com
