Canon NP-70 Service Manual page 123

NP-70
4-2'I
1) DRUM UNIT
The main elements of the Drum Unit, as shown in Fig. 4-25, are a metal cylinder, two metal
end flanges, and a center guide pipe. The cylinder is covered by a three layer wrapping which
contains the CdS material.
• Drum
Flange Retaining Screw
Flange
Fig. 4-26 Drum Unit
Guide Pipe
2) DRUM GEAR
The Drum Gear, 162 mm in outer diameter, has 160 teeth. Additionally, a number of control
cams are attached to the rear side of it. All of the cams have a fixed position for mount-
ing on the Drum Gear and each has one specific function in relationship to the total operation
of the NP-70.
3) FRONT-SIDE HOLDER PANEL MOUNTING PLATE
This Front-side Holder contains the spring which, when installed, presses the Drum Shaft to-
ward the copier rear for proper seating.
4) SHAFT HOLDER (REAR)
This Shaft Holder, installed on the Rear Main Body Mounting, holds the Drum Shaft securely
with hex nuts. This components is not removable from the machine as its position is very
critical for proper copier operation.
© CANON ANC.
Second Printing~une, 1974