Outline Of Electrical Circuitry; Outline; Reader Controller Pcb - Canon iR5000i Service Manual

CHAPTER 1 BASIC OPERATION

2. Outline of Electrical Circuitry

2.1 Outline

The major mechanisms of the reader unit are controlled by the CPU on the reader control-
ler PCB.
The functions of the major ICs are as indicated in the following table.

2.2 Reader Controller PCB

Name
CPU • Controls the sequence of scanner
operations.
• Controls the original size detection
mechanism.
• Controls the CCD.
• Controls the communications with
the ADF.
RAM • Stores service mode data.
• Stores user mode data.
• Stores control data.
EEP-ROM • Backs up RAM data.
ROM • Stores control programs.
Controller unit
Printer unit
1-2 R
T01-202-01 List of Control Items
Differential
PCB
F01-202-01 Major PCBs
COPYRIGHT © 2001 CANON INC.
Description
• Controls the scanning lamp.
• Controls shading correction.
• Controls service mode.
• Controls the communications with
the main controller.
IC5025
(CPU)
IC5016
(ROM)
IC5008
IC5009
(RAM)
IC5027
(EEPROM)
IC5021
(IPC comm-
unication 2)
Reader controller PCB
2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001
Inverter
PCB
LA2
Scanner
M3
motor
CCD/AP
PCB
ADF