Controlling The Pickup Motor (M3); Controlling The Separation Motor (M4) - Canon DADF-Q1 Service Manual

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2.4.5 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

2.4.6 Controlling the Separation Motor (M4)

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

10 mm or more

Skew sensor (S5)

Separation sensor (S4)

Discrepancy detected in timing

[1]

PICKI1

IC18

PICKSTBY