The DC controller judges the cartridge presence based on the primary transfer current. The
DC controller measures the primary transfer current when the power is turned on or a door is
closed. When the measurement is over the specified value, the DC controller judges it “no
cartridge” and sends the error message to the formatter.
Figure 5-41.
Cartridge presence detection
Cartridge life detection
The DC controller detects cartridge life data and passes information about the following
aspects of the cartridge to the formatter:
● Toner level
● Photosensitive drum
● Developing unit
When any of the data exceeds a specified value, the DC controller judges the cartridge end
of life and sends an error message to the formatter, indicating either that the cartridge is
nearing end of life ("Warning"), or that the cartridge has reached end of life (“End”),
depending on the readings of the above data.
Toner level detection
ENWW Image formation system 161
