Canon imageRUNNER ADVANCE C5255 Series Service Manual page 92

2
Technology > Image Formation System > Controls > Developing/drum
MEMO:
Fuse cut operation is executed when the power is turned ON after a new Drum Unit is
installed.
Thus, if replacing a Drum Unit to another one (new one) to identify a cause of failure at
a field, fuse is blown and the drum thickness data is cleared.
As a result, even though the original Drum Unit is installed to the host machine again,
the host machine identifies it as like-new one and correct print image may not be output.
With consideration to above matter, do not use a new Drum Unit when identifying a
cause of failure.
2 Technology > Image Formation System > Controls > Developing/drum
● Drum life detection
To detect life of the Photosensitive Drum.
The life data is stored in the SRAM (IC2) of the DC Controller.
The drum life value can be checked from the service mode.
Target drum Detection items
Color drum Primary Charging DC Bias SRAM (IC2)
(YMC) Monitor value (For details, of the DC
refer to "Drum film thickness Controller
detection".)
Bk drum Drum rotation time + Primary
charging AC bias applying
time
*1: The life data varies according to the image type, paper type, use environment, etc.
For this reason, the value written in the service mode (drum counter life display) is for
reference, so this is not the accurate value.
Because of detection sequence, display in service mode may not be changed from 0% for
a while (approx. 2,000 sheets) when using a new drum. After feeding approx. 2000 sheets,
approximate number can be displayed.
Data storage
Reference service mode
location
Drum counter life display
(COPIER > COUNTER >
LF > Y-DRM-LF, M-DRM-LF,
C-DRM-LF)
Drum counter life display
(COPIER > COUNTER > LF >
K-DRM-LF)
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Unit
%
%
T-2-34
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