Canon 1000 Service Manual page 205

2. Controlling the Transfer Belt Motor
a. Outline
The transfer belt rotates by the drive of the transfer belt (M14). Figure 3-631 shows the circuit that
controls the transfer belt, and the circuit has the following functions:
• Turns on/off the transfer belt motor.
• Executes constant speed control over the transfer belt motor.
b. Controlling the Motor
The DC controller PCB causes the transfer belt motor drive signal (M14D*) to go '0' in response to the
activation of the transfer belt motor and, at the same time, generates the transfer belt motor reference pulse
signal (M14PLS).
When M14D* and M14PLS are input to the motor drive pulse generator circuit on the transfer belt motor
driver PCB, motor drive pulses are sent to the motor drive circuit, causing the transfer belt to rotate at a
specific speed.
J2219B
-4
M14D*
J2219B
-5
M14PLS
DC controller PCB
COPYRIGHT © 2001 CANON INC.
Sensor
PS10 Transfer belt cleaning web rotation sensor
PS11 Transfer belt cleaning web length sensor
PS12 Transfer belt lifter sensor 1
PS13 Transfer belt lifter sensor 2
PS16 Transfer belt home position sensor
PS17 Transfer belt edge sensor 1 (front)
PS18 Transfer belt edge sensor 2 (rear)
PS19 Transfer belt edge sensor 3 (front)
PS20 Transfer belt edge sensor 4 (rear)
Table 3-608 Sensors in the Transfer Unit
Motor
drive pulse
generator circuit
Transfer belt motor driver PCB
Figure 3-631
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATION AND TIMING
Name
Motor drive
circuit
Transfer belt motor
M14
3-161