Canon imageRUNNER ADVANCE C350 series Service Manual page 105

2
Technical Explanation > Image Formation System > Controls > Drum Unit (Developing/Drum)
● Drum Unit Life Detection
Life of the Drum Unit (Photosensitive Drum) is detected.
This machine does not have a Photosensitive Drum film thickness detection mechanism
so the change in the film thickness is calculated by the rotation time of the Photosensitive
Drum + time that the primary charging DC bias is applied.
Detection timing
• At power-on
• At every print
• At recovery from sleep mode
Detection description
1) The count value for the drum life is calculated by the rotation time of the Photosensitive
Drum + time that the primary charging DC bias is applied as well as the time that the
developing AC bias is applied.
2) The count value calculated in step 1 of "Control description" is added to the drum
count value stored in the Drum Unit Memory PCB of the Drum Unit.
NOTE:
The life (displayed in %) can be checked by the following service mode:
• Drum counter life display (Y)
COPIER > COUNTER > LF > Y-DRM-LF
• Drum counter life display (M)
COPIER > COUNTER > LF > M-DRM-LF
• Drum counter life display (C)
COPIER > COUNTER > LF > C-DRM-LF
• Drum counter life display (Bk)
COPIER > COUNTER > LF > K-DRM-LF
2 Technical Explanation > Image Formation System > Controls > Drum Unit (Developing/Drum)
Pre-toner Low Alarm
Timing • Y/M/C/K-DRM-LF (*1)
= 100% (initial value)
The value can be
changed in service
mode.(*2)
Detected to (location) Drum Unit Memory PCB
Message (Operation None
of the host machine)
Alarm code 40-0070 (Y), 0071 (M),
0072 (C), 0073 (Bk) (*4)
*1: (Lv.1) COPIER > COUNTER> LF > Y/M/C/K-DRM-LF
*2: (Lv.1) COPIER > OPTION > FNC-SW > D-DLV-CL/BK
*3: Display/Hide can be switched in (Lv.2) COPIER > OPTION > USER > P-CRG-LF (0: Hide)
*4: During the period from when a pre-toner low alarm is sent to when a replacement
completion alarm is sent, the next pre-toner low alarm is not sent. It is displayed
in COPIER > DISPLAY > ALARM-2.
*5: It is displayed in COPIER > DISPLAY > ALARM-3.
Display to prompt Completion of
replacement replacement
7 days after pre-toner low When the Drum Unit is
alarm is sent (Default: detected
Hide (*3))
- Drum Unit Memory PCB
Replace the Drum Unit. None
None 35-0070 (Y), 0071 (M),
0072 (C), 0073 (Bk) (*5)
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