Controlling The Pickup Motor (M3) - Canon DU7-1101-000 Service Manual

5.

Controlling the Pickup Motor (M3)

Figure 2-226 shows the circuit used to control the pickup motor (M3). The pickup motor is a 4-
phase stepping motor, and the circuit has the following functions:
• Turning on and off the motor
• Controlling the direction of motor rotation
• Keeping the motor at rest
ADF controller PCB
Q1
CPU
The CPU (Q1) on the ADF controller PCB causes the motor retention signal (PICKHOLD) to
go '0', and applies +24 R to the pickup motor for drive. At the same time, the CPU sends the phase
control signal (PICKA, PICKB) to the motor driver (Q24). In response, the motor driver controls the
output timing of the pulse signals to suit the phase control signal, thereby switching the rotation of
direction of the pickup motor.
In the absence of the phase control signal (PICKA, PICKB) from the CPU, the motor retention
signal goes '1', applying +5 R to the pickup motor for retention, thereby holding the motor shaft from
rotating.
Related Error Code
E410
COPYRIGHT © 1999 CANON INC.
PICKHOLD
Motor retention signal
PICKA
Phase control signal
PICKB
Phase control signal
+5v
Figure 2-226
• Error in the pickup motor (M3)
• Error in the pickup roller height sensor (PI8)
• Error in the pickup roller height sensor (PI9)
• Error in the pickup roller home position sensor (PI7)
• Error in the ADF controller PCB
CANON ADF FOR iR600 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2 OPERATIONS
+24R +5R
Q53
Q52
J11
A
6
2
Q24
A*
4
B
5
1
Motor
B*
3
driver
Pickup motor
M3
2-31