Canon NP6085 Service Manual page 390

4) clean the upper transfer guide r.
Front
Figure 4-516
5) Install the upper transfer guide by reversing the
steps used to remove it.
COPYRIGHT © 1996 CANON INC.
Drum unit
r
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
7. Cleaning the Photosensitive Drum
• Check the images every 250,000 copies. Clean
the photosensitive drum if uneven density is
noted in the form of horizontal bands of halftone
with the same noted on the drum.
1) Turn the pre-exposure lamp to release it.
2) Put about 0.2 to 0.3 g of cleaning powder (CK-
0429) on lint-free paper, and put about 5 to 10 cc
of alcohol over it.
3) While lightly pressing over the lint-free paper,
move it from the front to the rear and vice versa.
At this time, try so that each width of about 5 to
10cm is wiped 5 to 6 times.
4) When the alcohol has evaporated, dry wipe the
surface with lint-free paper.
5) Turn the gear of the photosensitive drum, and
repeat steps 2) through 4) to cover the entire sur-
face of the drum.
Caution:
• Be sure to clean the photosensitive drum
before replacing the cleaning blade.
• Take care so that the drum cleaning powder
( C K - 0 4 2 9 ) w i l l n o t t u r n i n t o p a s t e
when performing step3).
• Check to make sure that no drum cleaning
powder (CK-0429) remains on the drum.
4. MECHANICAL SYSTEM
4-69