Start-Up Sequence; Overview - Canon imageRUNNER 2270 Service Manual

Chapter 4

4.3 Start-Up Sequence

4.3.1 Overview

0006-6702
The system software used to control the machine is stored on the HDD.
When the machine is started, the CPU on the main controller PCB reads the system software
from the HDD according to the instructions of the boot ROM boot program, and writes it
to the image memory (SDRAM) of the controller PCB.
While the CPU reads the system software from the HDD to the image memory (DRAM),
the control panel shows the following screen, using a progress bar to indicate the progress
of the start-up sequence.
Progress bar
2 3
1
F-4-5
Do not turn off the main power while the progress bar is indicated, as access is being made
to the HDD. Turning off the power can cause a fault on the HDD (identified by E602).
4-8