Canon PC720 Service Manual - Page 145

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MECHANICAL SYSTEM! 2. Cleaning the Drum Caution: As a rule, do not clean or touch the photosensitive drum. B. Transfer corona Assembly 1. Removing the Transfer Charging Roller 1) Open the copier's top unit. 2) Remove the screw T. 1) Open the copier's top body, and remove the cartridge. 2) Put the cartridge upside down, and open the drum shutter. 3) Clean the surface of the drum using a cloth coated with toner. Caution: 1. The drum must always bp rotated in the direction it rotates when making copies. Rotating it in the opposite direction will displace the leaf spring used to apply a developing bias to the developing cylinder. 2. Do not use paper, lint-free or others, to avoid damage to the drum; use a flannel cloth. 3. Work quickly to limit the exposure of the drum to light. Reference: If the drum is exposed to light of 1500 lux (general lighting) for 5 min and left alone thereafter in a dark place for 5 min, it is likely to recover to a level that will not cause any practical problems; however, take all measures necessary to avoid exposure. (The direct rays of the sun, in passing, is as strong as 10,000 to 30,000 lux.) O Figure 4-502 3) While disengaging the claw ® of the bushing, remove the transfer charging roller ©. 3 LZt- Figure 4-503 Caution: Do not touch the roller surface; take care not to soil the roller surface. COPYRIGHT © 1994 CANON INC. CANON PC720f7401750/710 REV.O AUG.1994 PRINTEDIN JAPAN1IMPRIME AUJAPON) 4 - 29

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MECHANICAL
SYSTEM!
2.
Cleaning
the
Drum
Caution:
As
a
rule,
do
not
clean
or
touch
the
photosensitive
drum.
1)
Open
the
copier's
top
body,
and
remove
the
cartridge.
2)
Put
the
cartridge
upside
down,
and
open
the
drum
shutter.
3)
Clean
the
surface
of
the
drum
using
a
cloth
coated
with
toner.
Caution:
1.
The
drum
must
always
bp
rotated
in
the
direction
it
rotates
when
making
copies.
Rotating
it
in
the
opposite
direction
will
displace
the
leaf
spring
used
to
apply
a
devel-
oping
bias
to
the
developing
cylin-
der.
2.
Do
not
use
paper,
lint
-free
or
oth-
ers,
to
avoid
damage
to
the
drum;
use
a
flannel
cloth.
3.
Work
quickly
to
limit
the
exposure
of
the
drum
to
light.
Reference:
If
the
drum
is
exposed
to
light
of
1500
lux
(general
lighting)
for
5
min
and
left
alone
thereafter
in
a
dark
place
for
5
min,
it
is
likely
to
recover
to
a
level
that
will
not
cause
any
practical
problems;
however,
take
all
measures
necessary
to
avoid
exposure.
(The
direct
rays
of
the
sun,
in
passing,
is
as
strong
as
10,000
to
30,000
lux.)
B.
Transfer
corona
Assembly
1.
Removing
the
Transfer
Charging
Roller
1)
Open
the
copier's
top
unit.
2)
Remove
the
screw
T.
O
Figure
4-502
3)
While
disengaging
the
claw
®
of
the
bushing,
remove
the
transfer
charging
roller
©.
3
LZt
-
Figure
4-503
Caution:
Do
not
touch
the
roller
surface;
take
care
not
to
soil
the
roller
surface.
COPYRIGHT
©
1994
CANON
INC.
CANON
PC720f7401750/710
REV.O
AUG.1994
PRINTED
IN
JAPAN
1IMPRIME
AU
JAPON)
4
-
29