Canon CLBP-460PS, Service Manual, Page: 92 / 566

5. Toner cartridge motor control
Figure 2-2-26
The toner cartridge motor is a two-phase stepping motor. This motor is controlled by the toner
cartridge motor driver (IC227) on the developing PCB, operates the developing cylinder in the
toner cartridge, and perform the toner cartridge contact/separation operation.
When the S-CPU (IC1010) receives a PRINT SEQUENCE SPECIFICATION command from the
M-CPU (IC1009), the S-CPU (IC1010) sends TONER CARTRIDGE DRIVE signals (SLVMA,
SLVMB, /SLVMON) to IC227.
In response to these signals, IC227 rotates the toner cartridge motor.
The rotational direction of the toner cartridge motor is changed between the developing cylin-
der drive and the toner cartridge contact/separation movement drive. The motor rotates counter
clockwise to drive the developing cylinder and clockwise to perform the toner cartridge con-
tact/separation operation. The toner cartridge position is detected by the toner cartridge contact
sensor (PS11). The S-CPU monitors the signal sent from the sensor to control the motor rota-
tion. The M-CPU also monitors the signal.
See page 2-53 for details of the toner cartridge contact sensor.
2 - 34
CHAPTER 2
PS11
Toner cartridge
motor driver
Toner cartridge
contact sensor
J203
-1
-3
-4
-5
-2
-6
SLVMCA
-B8
-B9
-B4
-B3
S-CPU
(IC1010)
M-CPU
(IC1009)
+5V
REF5V
SLVMCB
SLVMAO
/SLVMAO
SLVMBO
/SLVMBO
IC227
+24VA
M5
DC controller PCB Developing PCB
J1017
-B7 J201
-B5 SLVMA
SLVMB
/SLVMON
Toner cartridge
motor