1 October, 1999DEVELOPMENT
2.4.7 TONER NEAR END/END DETECTION AND RECOVERY
The toner near end and end conditions are detected using the Vt and Vref values,
in a similar way to toner density control.
This is done in all toner supply modes except for fixed quantity 2, when toner end is
not detected.
Toner Near End Detection
If Vt is at level 6 (see the table on the previous page) five times consecutively, the
Detailedmachine enters the toner near end condition and the toner end indicator starts
Descriptions
blinking. Then the machine supplies toner for a certain time in accordance with the
table explained in the previous section.
Toner Near End Recovery
If the machine detects ?Vt < (Vref or Vts) + 4S/5? twice consecutively when in one
of the following situations, the machine leaves the toner near end condition.
? While in the toner recovery cycle (supplying toner on and off for 30 s - see
the previous page) after the machine has detected a toner near end
condition.
? During printing in the toner near end condition.
? If the front cover is opened and closed for more than 10 seconds while a
toner near end condition exists.
Toner End Detection
There are two situations for entering the toner end condition.
? When Vt is level 7 three times consecutively, the machine enters the toner
end condition.
? When ?Vt+S > Vt > (Vref or Vts) + 4S/5? is detected in the toner near end
condition, then 50 prints can be made after this condition.
Toner End Recovery
If the front cover is opened and closed for 10 seconds while a toner end condition
exists and the toner bottle is replaced, the machine attempts to recover using the
same procedure as for toner near end/end detection.
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