Outline Of Electrial Circuitry - Canon FINISHER - D1 Service Manual

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.
Figure 2-102 shows the flow of signals between the finisher and the option controller.
Copier DC
controller PCB
CPU
Fuse PCB
2-2
COPYRIGHT © 1999 CANON INC.
• 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.
Finisher
Finisher controller PCB
IC101 IC108
Master CPU Communications IC
IC102 IC121
Master EEPROM Slave
CPU
IC105
IC122
Master EPROM
Slave
RAM
IC106
Master RAM
IC123
DPRAM
Figure 2-102
CANON FINISHER - D1 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Motor
Solenoid
Switch
Sensor