Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 53 / 987

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". The shutdown
sequence has been manually executed with the legacy (existing) models (by holding down the power supply switch on the Control
Panel for a specific duration).
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 110 seconds.
NOTE:
When the power supply is stopped without advance shutdown of the equipment, or the complete deletion process of the HDD
(deletion of the primary file) failed to be completed within the shutdown time (max. 110 sec.), data matching is checked at startup.
The progress bar is displayed during the data checking.
Motion Sensor
Function
Features of the Motion Sensor functions are shown below.
• When the machine detects a person staying in front of it (in the area where the sensor works) for more than a certain period
of time, it automatically recovers from sleep mode.
• It judges whether the person is a user or a passerby and controls not to perform recovery triggered by passersby in order to
reduce unnecessary power consumption.
• Criteria for judging whether a person is a user or passerby are shown below.
• If a person approaches the machine from the front, the sensor judges the person as a user and starts recovery from
sleep mode quickly.
• If a person approaches the machine from the side, the sensor judges the person walking fast as a passerby and the
person walking slowly as a user.
• The machine may recover from sleep mode in response to the detection of the passerby walking slowly, but the machine
shifts to sleep mode again if it is not operated within a specified period of time.
CAUTION:
Do not block the opening because the sensor generates ultrasonic waves and detects reflected waves.
Settings/Registration
This function can be set from the following menu.
[Settings/Registration] > [Preferences] > [Timer/Energy Settings] > [Use Motion Sensor]
ON/OFF of this function and the sensor sensitivity can be configured.
2. Technology
42