Ricoh LD013, Service Manual

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DEVELOPMENT
SM 6-49 B039/B040/B043
6.1.8 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 mode 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
machine enters the toner near end condition and the toner end indicator starts
blinking. Then the machine supplies toner for a certain time, which depends on the
setting of SP2-923 (see the previous page).
Toner Near End Recovery
If the machine detects “Vt < (Vref or Vts) + 4S/5” twice consecutively in any of the
following situations, the machine clears 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 copying 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. Following this, 50 copies can be made (the number of copies
between this condition and toner end can be changed using SP2-213).
Toner End Recovery
While turning on the main switch, if the front cover is opened for 10 seconds or
more and then closed while a Toner End condition exists (following toner bottle
replacement), the machine clears the Toner End condition. The recovery procedure
is the same as for toner near end. It takes about two minutes.