Canon imageRUNNER ADVANCE C5255 Series Service Manual page 49

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Technology > Controller System > Overview > Shutdown sequence
■ Shutdown sequence
Before turning OFF the main power switch, it is necessary to perform HDD completion
processing (to prevent damage on the HDD), cooling of the internal printer (to prevent fixed
toner due to high temperature) and exhaust (to prevent smeared image due to chemical
reaction of ozone in the machine and photosensitive drum). This sequential processing is
called "shutdown sequence" and was executed on the legacy models manually (by holding
down the power supply switch on the Control Panel for a specific duration).
When the main power switch is turned OFF on the main body, Main Controller PCB 1 detects
this operation and then the shutdown sequence starts / executes automatically.
In addition, hardware shutdown sequence exists. If shutdown sequence is not executed
normally due to occurrence of software trouble, the machine is shut down in 110 seconds at a
maximum by the timer in the AC Driver PCB. If it is not shut down within 110 seconds, failure
of the AC Driver PCB is suspected.
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2 Technology > Controller System > Overview > Shutdown sequence
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