Canon i-SENSYS MF229dw Service Manual page 45

2
Technical Overview > Image Formation System > Toner Cartridge > Toner Cartridge Absence/Presence Detection
● 3in1 Model
Display
<Preparing a cartridge is This message notifies you that a toner cartridge needs to be replaced
recommended.> soon. Shake the toner cartridge to evenly distribute the toner inside the
cartridge. Replace the toner cartridge if you see this message before you
start to print a large job.
You can continue printing when this message is displayed, but the print
quality may deteriorate.
■ Operation when toner level is Low/Nearly Out
Operation when toner level is Low or Nearly Out is as follow. If another job which can be
processed is introduced while there is a job which is stopped due to "Nearly Out", the job is
output by overtaking the preceding job.
List of stop processing according to toner level
Copy PDL Receive print
Low Nearly Out Low Nearly Out Low
Yes Yes Yes Yes Yes
Yes: Continues
No: Page output is stopped immediately after detection, but it can be continued by user
mode.
2 Technical Overview > Image Formation System > Toner Cartridge > Toner Cartridge Absence/Presence Detection
Hnadling
Manual report Auto report
Nearly Out Low Nearly Out Low Nearly Out
No Yes Yes Yes No
■ Toner Cartridge Absence/Presence Detection
The engine controller detects the position of the Toner cartridge detection flag to judge the
absence/presence of the Toner cartridge.
At the time of turning on the power or closing the upper cover, the engine controller judges
the position of the Toner cartridge flag based on the output result of the leading edge sensor
(PS751).
When the output result of the leading edge sensor (PS751) is L, it is judged that the Toner
T-2-5
cartridge is absent; If being H, it is judged that the Toner cartridge is present.
PS751
T-2-6
Leading edge
sensor detection flag
Toner
cartridge=No
PS751="L"
The leading edge sensor performs both this detection and paper feed detection. Therefore,
the engine controller cannot make a judgment of 'Toner cartridge absent' or 'jam occurrence'
when jam occurs.
The engine controller judges this case as 'Toner cartridge absent' and notices it to the main
controller.
Engine controller
Toner cartridge
detection flag
Toner
cartridge=Yes
PS751="H"
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