2-2
COPYRIGHT © 1999 CANON INC.
CANON FINISHER - D1 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2 OPERATIONS
B.
Outline of Electrical Circuitry
The series of operations of the finisher are controlled by the finisher controller PCB, which is an
8-bit microprocessor (CPU). The finisher controller PCB serves to control sequences of operations
and to communicate in serial with the host copier.
The finisher controller PCB drives the solenoids and motors in response to various commands
from the host copier through a serial communication line. It also communicates data on various
sensors and switches to the host copier using the serial communication line.
The functions of the major ICs mounted on the finisher controller PCB are as follows:
• IC101 (master CPU)
Controls sequences of operations.
• IC102 (master EEPROM)
Backs up adjustment values.
• IC105 (master EPROM)
Contains sequence programs.
• IC106 (master RAM)
Backs up initial data.
• IC108 (communications IC)
Communicates with the host copier.
• IC121 (slave CPU)
Controls sequences of operations.
• IC122 (slave RAM)
Backs up initial data.
• IC123 (DRAM)
Controls communication between master
CPU and slave CPU.
Figure 2-102 shows the flow of signals between the finisher and the option controller.
Figure 2-102
Fuse PCB
IC101
Master CPU
IC102
Master EEPROM
IC105
Master EPROM
IC106
Master RAM
IC108
Communications IC
IC121
Slave
CPU
IC122
Slave
RAM
IC123
DPRAM
Copier DC
controller PCB
CPU
Finisher
Motor
Solenoid
Switch
Sensor
Finisher controller PCB