Drum Film Thickness Detection - Canon imageRUNNER ADVANCE C5045 Series Service Manual

2
Model A: approx 6.1
At post- After printing per
Model B: approx 9.3
rotation total of 25 sheets
Model A: approx 11.7
After printing per
Model B: approx 17.1
total of 125 sheets
Model A: approx 5.0
After printing per
Model B: approx 7.6
total of 180 sheets
(model A) or total
of 120 sheets
(model B)
Model A: approx 2.8
After printing per
Model B: approx 4.3
total image ratio
800%
Model A: approx 42.6
After printing
Model B: approx 65.7
per total of 1000
sheets
Model A: approx 47.6
After printing
Model B: approx 72.1 ○
per total of 5000
sheets
Model A: imageRUNNER ADVANCE C5051/5045
Model B: imageRUNNER ADVANCE C5035/5030
*1: ITB dirt correction, patch sensor correction etc.
Related service mode
COPIER>OPTION>CLEANING>T-LW-LVL (setting of the number of sheet to execute
ITB cleaning sequence after transparency feed)
COPIER>CLEANING>IMG-TR>ITBB-TMG (setting of ITB cleaning interval)
2
Control types
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T-2-34 T-2-34

Drum film thickness detection

To detect use condition of the photosensitive drum
Execution timing
1) When the power is turned ON.
2) Every time making print
Control description
1) The drum count value is calculated by the monitor signal of the primary charging AC bias.
2) The count value calculated in step 1) above is added to the drum count value that has been
kept in SRAM.
3) The latest count value determined in step 2) above is classified to be one of the 10 levels
as the drum film thickness detection data.
4) The determined data is compared to the existing drum film thickness detection data kept in
the other area in SRAM. If there is any difference between both data, the newly-determined
data is overwritten on SRAM as the latest drum film thickness detection data. If there is no
difference in both data, the newly-determined data is not overwritten, but disposed.
Y M C
Photosensitive
drum
Primary charging
roller
MEMO:
Bk Drum for highly-durable type, the drum is no shave.
Therefore, Bk drum is not the thickness detection.
The result of drum thickness detection is reflected to the following data.
•
Developing bias
•
Primary transfer bias
•
ATR patch detection result
Laser output
•
DC controller
(UN1)
SRAM(IC2)
Drum count
data
Y
M
C
Bk
Drum film
Monitor signal
thickness data
HVT1
(UN16)
Primary charging
AC bias
Y
M
drive signal
C
2-60
F-2-97 F-2-97
2-60