Canon imageRUNNER ADVANCE C5500 Series Service Manual page 95

■ Drum Unit Life Detection
This machine measures the film thickness on the drum based on the application data and calculates the Drum Unit life from the
measured data.
The calculated life is recorded in the Drum Memory as information specific to the drum. The recorded information can be seen
in service mode.
NOTE:
Although conventional models used the detected drum film thickness also for image formation control, this model uses it only for
life calculation. Furthermore, although conventional models measured only the YMC drums, this model performs detection on all
of the CMYK drums.
Related Service Mode
Drum Unit (each color) estimated life:
COPIER > Counter > LF > Y-DRM-LF
COPIER > Counter > LF > M-DRM-LF
COPIER > Counter > LF > C-DRM-LF
COPIER > Counter > LF > K-DRM-LF
■ Drum Heater Control
A drum heater is provided on the bottom of the Photosensitive Drum in order to deliver charging and exposure that is stable
against changes in the internal environment.
This heater is controlled to keep the internal temperature constant. Basically, when the Environment Switch is ON, the heater is
ON regardless of ON/OFF of the main power except for during printing. (Excluding the case where the internal temperature is
high)
It also controls the Cassette Heater in the same manner. (Refer to the Pickup/Feed System Cassette Heater Control for details)
NOTE:
For the conventional models, a drum heater was provided only for Bk and drum heaters for other colors were option. Starting from
this model, drum heaters are provided for all colors as standard.
Photosensitive Drum
Drum Heater
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2. Technology