6.2 TONER END DETECTION
Four toner end sensors [A] (which are piezoelectric) are installed on the
toner tank to monitor the near end condition for each color toner. Toner end
detection is performed during toner agitation, and the detection sequence is
as follows.
1. Near Toner End Condition
The machine starts sampling the output of the toner end sensor every
0.1 second during the last three cycles of the toner agitation process
(see the previous page). If a no toner condition is detected for 90% of the
samples, the machine enters the near toner end condition.
2. Toner End Condition
When a near toner end condition is detected, a total of 30 copies can be
made using the toner for which the near end condition was detected.
After this, the machine enters the toner end condition and copying using
that toner is disabled.
3. Toner End Recovery
When the front door is opened and the toner tank rails are pulled out and
in, the machine starts to perform the toner end recovery procedure. The
sequence and the recovery condition is the same as for the near toner
end condition detection.
If the toner end condition is not cleared, copying using that particular color
toner is disabled. This prevents the customer from clearing the near end or
toner end condition by simply opening and closing the front cover or turning
the main switch off and on.
The green lever which was previously installed to prevent toner from flowing
into the development unit has been eliminated, due to the change in the
toner end detection mechanism.
[A]
Detailed
Descriptions
SM 2-27 A172/A199
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