Other Control Mechanisms; Developing Rotary Motor Control - Canon CP660 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM
VII. OTHER CONTROL MECHANISMS
A.

Developing Rotary Motor Control

DC controller PCB
D-CPU
(IC201)
M-CPU
(IC202)
DEVOFF
21
44
Q247
45
Q246
The developing rotary motor is a 2-phase stepping motor, controlled by the rotary
motor driver (IC701) on the developing rotary motor PCB, and is used to rotate the devel-
oping rotary.
In response to a print sequence command from the D-CPU (IC202), the M-CPU
(IC201) sends the developing rotary motor control signals (DEVPHA, DEVPHA*,
DEVPHB, DEVPHB*) to the rotary motor driver (IC701) on the developing rotary motor
PCB.
The rotary motor driver uses these signals to send drive signals (RMAO, RMAO*,
RMBO, RMBO*) to the developing rotary motor, switching the motor between normal and
low-speed rotation modes.
The motor torque would fluctuate according to the speed of the motor, requiring vari-
ation of the current level.
4-34
COPYRIGHT © 1999 CANON INC.
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+5V
DEVPHA
J706-A1
J220-A9
Q242
+5V DEVPHA*
-B1 -B9
Q245
+5V
DEVPHB
-A8 -A2
Q244
DEVPHB*
+5V
-B2 -B8
Q243
Figure 4-701
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Developing rotary motor PCB
Rotary motor driver
(IC701)
RMAO
6 8
RMAO*
5 1
RMBO
16
11
RMBO*
17 18
24VAR
J704-1
-2
Developing
rotary
motor
-3
M1
-4
-5
-6