Controlling The Pickup Motor (M3) - Canon DADF-R1 Service Manual

Chapter 3

3.4.5 Controlling the Pickup Motor (M3)

The following is a diagram of the circuit used to control the pickup motor (M3).The pickup motor is a 4-phase
stepping motor, and has the following mechanisms:
- turning on/off the motor
- controlling the direction of motor rotation
- holding the motor at rest
[1] ADF controller PCB
M3: pickup motor
The CPU (IC18) sends phase control signals (PICKA, PICKB, PICKA*, PICKB*) to the motor driver (IC31).
In response, the motor driver controls the output timing of the pulse signals accordingly, switching over the
direction of motor rotation.
PICKI0/PICKI1 is a current setup signal, and its variation (combination) enables a switch-over among 4 steps
(from 0 % to 100 %). PICKSTBY is a motor standby signal, and is used to turn off the motor drive circuit, during
which time no phase signal is sent to the motor.
Error code: E410
- fault in the pickup motor (M3)
- fault in the pickup roller height sensor (PI8)
- fault in the pickup roller height sensor (PI9)
- fault in the pickup roller home position sensor (PI7)
- fault in the ADF controller PCB
3-24
[1]
PICKI1
IC18
PICKSTBY
CPU
PICKI0
PICKB*
PICKB
PICKA*
PICKA
J11
B*
4
B
3
A*
2
A
1
F-3-29
M3
0013-3482