Construction Of The System Software - Canon iR105 Service Manual

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CHAPTER 3 MAIN CONTROLLER

When the self-diagnosis ends normally, the boot program stored in the boot ROM starts

up to read the system software from the HDD to write to the system area of the SDRAM.

When the write operation ends, the system software in the SDRAM starts up to initialize

the components of the machine (at the end of which the normal operating screen will appear

in the control panel) and, at the same time, the LED lamp of the Start key will change from

red to green to indicate that the machine is ready to accept a job.

The system software of the machine consists of multiple modules, and specific modules

as needed at specific times are called into the system area of the SDRAM for execution.

1.3.3 Construction of the System Software

The system software of the machine can broadly be divided into system modules (for con-

trol) and language modules (for indication on the control panel LCD).

To upgrade the machine, you will have to upgrade both the system modules and the lan-

guage modules.

Main controller PCB

: Access to the program during execution

: Flow of the system program

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CANON iR105 REV.0 JULY 2001

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