CHAPTER 3 MAIN CONTROLLER
3-6
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©
2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
When the self-diagnosis ends, the boot program that is also stored on the hard disk is
started to read the system software from the hard disk to the system area of the SDRAM.
When done, the system software of the SDRAM is started to initialize the parts; thereaf-
ter, the control panel shows the normal Operation screen and, at the same time, the Start key
LED changes from red to green to indicate that the machine is ready to accept a job.
The machine’s system software consists of multiple modules, and those modules that are
needed at a time are called into the system area of the SDRAM for execution.
F03-103-03
1.3.3 Composition of the System Software
The machine’s system software can broadly be divided into system modules (for control)
and language modules (for LCD indication).
Upgrading of the system software calls for upgrading both system and language modules;
for details, see 6. “Upgrading” in Chapter 6 “Troubleshooting.”
Self-
diagnosis
program
Boot
program
BOOT ROM
CPU
SD RAM
System
area
Image data
area
Main controller PCB
HDD
: Access to the program during execution
: Flow of the system program
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