Canon CLBP-460PS, Service Manual

Page: 90 / 566

3. Developing rotary motor control
Figure 2-2-24
The developing rotary motor is a two-phase stepping motor. This motor is controlled by the
rotary motor driver (IC202) on the developing PCB and rotates the developing rotary.
When the M-CPU (IC1009) receives a PRINT SEQUENCE SPECIFICATION command from the
D-CPU (IC1001), the M-CPU sends a DEVELOPING ROTARY MOTOR DRIVE signals (/ROTMON,
ROTMA, ROTMB), and DEVELOPING ROTARY MOTOR CONTROL signal (/IUPROTM) to IC202.
In response to these signals, IC202 rotates the developing rotary motor.
There are two developing rotary rotational speeds; normal speed during printing and low
speed during home position detection or when the rotary is shifting to the cartridge take-out
position. Motor torque changes with the rotational speed of the motor. The /IUPROTM signal
is switched to hold the motor with low current in order to maintain the developing rotary posi-
tion.
2 - 32
CHAPTER 2
Developing
rotary motor
Developing rotary
motor driver
J203-1
-3
-4
-5
-2
-6
M3
ROTMAO
/ROTMAO
ROTMBO
/ROTMBO
-B8
-B9
J201
-B5
-B10
-B4
-B3
J1017
-B7
-B2
ROTMA
ROTMB
/ROTMAON
/IUPROTM
M-CPU
(IC1009)
D-CPU
(IC1001)
+24VA
IC202
+5V
+5V
-B7 -B5
-B11 -B1
/ROTMBON
ROTMCA
ROTMCB
DC controller PCB Developing PCB