Ricon B156, Service Manual

Page: 418 / 781

DEVELOPMENT
B156/B220 6-52 SM
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
CMY
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 5 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.
Bk
When the machine detects a new toner cartridge, it operates the development unit
as shown below. (This is the default setting. You can change it with SP 2-964.)
• The development clutch is repeatedly turned on for 5 s and off for 1 s. This is
done for approximately 30 seconds.
• Then, the development clutch is repeatedly turned on for 0.8 s and off for 0.8 s.
This is done for approximately 70 seconds.
• Then, again, the development clutch is repeatedly turned on for 5 s and off for 1
s. This is done for approximately 30 seconds.
The second step (0.8 s on/0.8 s off) loads toner into the hopper quickly, but it
makes a lot of noise. Because of this, some customers could complain. Then, you
can change SP 2-964 from ‘Quick mode’ (default setting) to ‘Long mode (quiet)’.
SP 2-964 also has a ‘Medium mode’. This loads toner into the hopper more quickly.
It is also better than ‘Quick Mode’ and ‘Long mode’ to prevent dirty background that
occurs immediately after toner replacement. But it is estimated that ‘Quick Mode’
and ‘Long mode’ will not cause this symptom often.