Drum Unit Detection; Drum Unit Life Detection - Canon imageRUNNER ADVANCE C3325 Series Service Manual

2
Technical Explanation > Image Formation System > Controls > Drum Unit / Developing Unit
● Drum Unit Detection
Purpose: To detect whether the Drum Unit is installed
Detection timing:
• At power-on
• When recovering from sleep (after 8 hours or more have elapsed)
• When opening/closing the Front Door/Right Door
Execution time: Within 1 second
Detection description: The presence/absence of a Drum Unit is detected as follows:
• The following is determined from the DC current monitor value when the charging voltage
starts to be applied.
When the current monitor value is less than the specified value (5 micro A): Drum Unit absent
When the current monitor value is the specified value (5 micro A) or higher: Drum Unit present
NOTE:
If the Drum Unit is detected as present but the IC tag of the Drum Unit cannot be
detected, alarm code 09-0010/0011/0012/0013 is generated.
Host machine operation: If the Drum Unit is detected as absent, "Cannot recognize the drum
unit" is displayed on the LUI status line.
2 Technical Explanation > Image Formation System > Controls > Drum Unit / Developing Unit
NOTE:
Drum Unit detection may not be executed at times such as at recovery from sleep mode
(of 8 or more hours).
"No drum jam" is detected when a print job is executed with no Drum Unit installed in
the machine.
Related Jam Code: 00-0B0D: No drum jam
● Drum Unit Life Detection
Purpose: To detect the life of the Drum Unit (Photosensitive Drum)
Detection timing:
• At power-on
• For each print
• At recovery from sleep mode
Detection description:
1) The drum life is calculated from the drum rotation time + application time of the
primary charging DC bias.
2) The value calculated in step 1) is added to the Drum count value that has been stored
in the IC tag of the Drum Unit.
DC Controller PCB
(UN04)
Drum Unit
Memory PCB
(UN35∼38)
NOTE:
The life (displayed in %) can be checked by the following service mode:
COPIER > COUNTER > LF > Y/M/C/K-DRM-LF : Drum counter life display (Y/M/C/Bk)
F-2-49
Life Information
Drum Unit Memory
2-38
2-38