Canon PC920 Service Manual page 262

c. Do not touch the surface of the photosensitive drum as by opening the shutter for the photosen-
sitive drum cover found at the bottom of the cartridge.
(If you have soiled the surface of the photosensitive drum, wipe it with a flannel cloth coated
with toner. Do not clean it using solvents.)
d. Do not disassemble the cartridge.
e. Do not subject the cartridge to excess vibration or impact. In particular, do not impose force on
the shutter for the photosensitive drum shutter.
f. Make sure that it is out of reach of children.
g. The photosensitive drum is susceptible to strong light, and the light-blocking shutter is pro-
vided as a means of protection.
If the drum is exposed to strong light for a long time, however, copies can start to show white
spots or vertical bands. Try leaving the machine alone as long as possible if such a problem is
noted; the memory (i.e., cause of white spots or vertical bands), however, may not disappear.
Keep the following in mind:
Caution:
1. Try to work briskly when removing a jam or replacing the cartridge.
2. If the cartridge must be taken out of the machine for storage, be sure to put it in a protective
box or put a cover over it. Do not leave it outside the machine unprotected.
Reference:
If the photosensitive drum is exposed to light of 1500 lux (general lighting) for 5 min and then
left alone in a dark place for 5 min, it should recover so that it will not cause practical prob-
lems. Nevertheless, avoid direct sunshine. (The rays of the sun is as strong as 10000 and
30000 lux.)
COPYRIGHT © 1999 CANON INC.
CHAPTER 10 MAINTENANCE AND SERVICING
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-5