26 July 2002 DEVELOPMENT
6-51
Detailed
Descriptions
Toner End Detection
When any one of the following conditions occurs, toner end is indicated.
1. If near-end was detected by pixel count:
The remaining pixel count reaches 0.
2. If near-end was detected by toner end sensor:
Either 100 developments or 100 prints at 5% coverage are made since near-
end was detected.
3. If near-end was detected by pixel count, and later it was detected by toner end
sensor again before toner end:
Either the remaining pixel count reaches 0, or 100 developments or 100 prints
at 5% coverage are made since near-end by toner end sensor was detected.
Toner End Recovery
When the machine detects a new toner cartridge, it drives the development unit for
that cartridge for about 3 minutes.
During this time, the development clutch is repeatedly activated for 10 s and
deactivated for 1 s.
The machine checks the toner end condition every 20 s. The end and near-end
conditions are cleared if the sensor detects sufficient toner. However, if the sensor
does not detect sufficient toner after 5 minutes of development unit drive, the toner
end condition remains and a new cartridge must be added.
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