Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 68 / 987

Life
Information
1) Drum Unit
detection
2) DC current monitor value
Drum Unit
DC Controller PCB
(UN04)
Drum Unit
Memory PCB (Y/M/C/Bk)
(UN12)
NOTE:
Drum Unit detection may not be executed at times such as at recovery from sleep mode (of 4 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
Alarms and messages such as "prior delivery alarm", "replacement notification", and "replacement completion" are output based
on the result of Drum Unit (Photosensitive Drum) life detection control.
Since this machine does not have a function for detecting the thickness of the film of the Photosensitive Drum, change in the film
thickness is calculated on the basis of the rotation time of the Photosensitive Drum and the application time of the primary charging
DC bias.
Status Prior delivery alarm Display that prompts replace-
ment
Completion of replacement
Alarm code Drum Unit LF setting value reaching
alarm (*1) None Drum replacement detection
alarm
Drum memory detection error
Message (machine
operation) None Replace the Drum Unit. None
Detection timing Depends on the service mode set-
ting*2 7 days after prior delivery alarm is sent
(Default: Hide (*3)) When the Drum Unit is detected
Detected to (location) Drum Unit Memory PCB - Drum Unit Memory PCB
*1: During the period from when a prior delivery alarm is sent to when a replacement completion alarm is sent, the next prior
delivery alarm is not sent but displayed in COPIER > DISPLAY > ALARM-2.
*2: COPIER > OPTION > FNC-SW > D-DLV-CL / COPIER > OPTION > FNC-SW > D-DLV-BK
*3: Display/Hide can be switched in (Lv.2) COPIER > OPTION > USER > P-CRG-LF (0: Hide)
Related service mode
• Display of the Drum Unit life (each color)
COPIER > COUNTER > LF > Y-DRM-LF
COPIER > COUNTER > LF > M-DRM-LF
COPIER > COUNTER > LF > C-DRM-LF
COPIER > COUNTER > LF > K-DRM-LF
Related alarm codes
40-007x: Drum Unit LF setting value reaching alarm
• 40-0070: Y, 40-0071: M, 40-0072: C, 40-0073: Bk
43-007x: Drum replacement detection alarm
• 43-0070: Y, 43-0071: M, 43-0072: C, 43-0073: Bk
2. Technology
57