CHAPTER 2 FUNCTIONS & OPERATION
IV. CONTROL SYSTEM
1. Control Circuits
The machine is controlled by the control
PCB and front unit PCB. The block diagram
and the function list of major ICs are shown
below.
CIS PCB
(front)
CIS PCB
(rear)
Computer
(USB interface)
Controller PCB
Analog
preprocessor
Scanner
controller
Ultrasonic
control
microcontroller
Ultrasonic
sensor
(receiver)
Front unit
PCB
Ultrasonic sensor
(transmitter)
Document sensor
(transmitter)
Switch
(power)
Switch
(scan)
Door sensor
Power LED
Motor driver
Motor driver
Main motor
Feed motor
Registration
sensor
Document
sensor
(receiver)
Figure 2-401
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CANON ELECTRONICS INC. 2011 CANON DR-C125 FIRST EDITION
2-13