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C.
Controlling the Drum Motor
44
46
45
43
The drum motor is a 2-phase stepping motor, and is controlled by the drum motor
driver (IC210) to drive the intermediate transfer drum and the photosensitive drum.
In response to a print sequence command from the D-CPU (IC202), the M-CPU
(IC201) sends drum motor drive signals (DRMPHA, DRMPHA*, DRMPHB, DRMPHB*)
to the drum motor driver (IC210).
IC210 uses these signals to supply the motor with drive signals (DRMPHA, DRM-
PHA*, DRMPHB, DRMPHB*), thereby rotating the intermediate transfer drum and the
photosensitive drum.
In transparency mode and thick paper mode, the drum motor is rotated at low speed
(1/4 for transparency mode, 1/3 for thick paper mode) to slow down the movement of
paper through the fixing assembly.
COPYRIGHT © 1999 CANON INC.
Download free service manual at http://printer1.blogspot.com
DC controller PCB
D-CPU
(IC201)
DRMPHA*
DRMPHB*
DRMPHB
DRMPHA
Figure 4-703
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
Drum motor
+24UH
driver
(IC210)
24UH
7
24UH
12
DRMPHA*
1
5
DRMPHB*
18
17
DRMPHB
16
11
DRMPHA
6
8
Drum motor
J224-1
-2
-4
-6
M2
-5
-3
4-37
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