Startup Sequence; Shutdown Sequence - Canon imageRUNNER ADVANCE 4551i Service Manual

Startup Sequence

Power Supply Switch ON
NOTE:
To achieve faster startup, the progress bar and the active PCB are not synchronized.
For this reason, the progress bar cannot be utilized for troubleshooting.
For information about troubleshooting, refer to "Related error codes (major error codes)" shown below.
Related error codes (major error codes):
• E602-0001: HDD detection error
• E614-0001: Flash PCB detection error
• E614-0002: Error in file system on the Flash PCB
• E614-4001: Error in file system on the Flash PCB
• E614-4002: Error in file system on the Flash PCB
• E748-2010: Flash PCB error / HDD error
NOTE:
When the following errors occur, the system of the host machine has not been started normally. Therefore the error code is not
recorded in the log.
E602-XX01, E614-XX01, E748-2010

Shutdown Sequence

Before shutting down the power supply, it is necessary to perform the HDD completion process (Purpose: to prevent damage on
the HDD) and execute the fixing disengagement operation.This sequential process is called "shutdown sequence".
With this machine, the Main Controller PCB detects turning OFF the Main Power Supply Switch, and the shutdown sequence is
started and executed automatically.
Note that the maximum shutdown time with this equipment is 90 seconds. (If the maximum of 90 seconds has elapsed, the power
supply is turned OFF by the hard timer circuit on the Relay PCB.)
Standby screen display
Screen sequence and internal processing sequence
Power Supply
Switch ON
Initializing process of hardware
Starting BIOS
[Main Controller PCB]
Starting IPL (boot program)
and OS system software
[Flash PCB]
Starting application
[Hard disk]
Standby
screen display
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2. Technology