Fig. 4-27 Drum Position In Copier (From Copier Front) - Canon NP-70 Service Manual

4-22
NP•70
4.4-3 REMOVAL/INSTALLATION ACTIONS
1) DRUM UNIT REPLACEMENT
The Drum Unit is the only portion of this assembly requiring- special care during replacement.
It should be performed according to the following steps.
a) Lift the copier upper access door and, then, let down the Copy Conveying Assembly by
releasing the lock handle which holds it in place.
b) Open the front left cover and remove the Developer Assembly.
c) Lift the Drum Cleaner Assembly by setting the lock arm to the upper position.
d) Remove the mounting plate which holds the drum on the shaft. This plate is mounted on
the frame at the front-end of the shaft.
e) Pull out the complete drum, carefully grasping the front-side flange so that the drum's sur-
face is not scratched. When removing the drum, do not touch the surface.
f) Repeat steps a) ^~ e) in reverse order for installation. During installation, make sure that
the following points are observed:
g) When the Drum Unit is placed in the copier, make sure that the wrapping direction of the
photosensitive sheet is opposite to the drum rotation as shown in Fig. 4-27; otherwise, the
photosensitive sheet may be peeled off by the Drum Cleaner Blade.
Drum Cleaner Blade
a) Correct
b) Incorrect
Fig. 4-27 Drum Position in Copier (from copier front)
h) In the event that a new drum is being installed in the copier, rotate it for one revolution
to apply developer liquid to the drum's surface before lowering the drum cleaner blade.
Second Printing-June, 1974
© CANON INC.