Canon DADF-Q1, Service Manual

Page: 41 / 156

Chapter 2
2-19
F-2-29
2.4.5 Controlling the Pickup Motor (M3)
0011-2333
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
F-2-30
[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
2.4.6 Controlling the Separation Motor (M4)
0011-2345
The following is a diagram of the circuit used to control the separation motor (M4). The separation motor is a DC motor, and the circuit has the following functions:
- turning on/off the motor
- controlling the speed of the motor
- protecting the motor against overcurrent
Original moving askew
Skew sensor (S5)
Separation sensor (S4)
Discrepancy detected in timing
10 mm or more
M3
IC31 MO
T
OR DRIVER
IC18
CPU
J11
4
B*
B
PICKI1
A*
A
2
[1]
1
3
PICKSTBY
PICKI0
PICKB*
PICKB
PICKA*
PICKA