Oki B 4100 Maintenance Manual page 519

B1.4 Toner Low Detection
• Hardware configuration of toner sensor
The figure below shows the hardware configuration of the toner sensor.
• Toner detection method
(1) Toner sensor monitoring conditions are shown in the figure below.
Toner sensor
Caution: The toner sensor is not monitored when the drum is inactive.
(a) When the toner-low state continues twice, Toner Low occurs. (This state is monitored at a cycle
of 40 milliseconds.)
(b) When the toner-full state continues twice, Toner Low is released. (This state is monitored at a cycle
of 40 milliseconds.)
(c) When the toner sensor does not change over two cycles (T x 2), the toner sensor alarm state occurs.
(d) After the EP unit has been replaced (after the drum counter has been reset), Toner Low is not
detected when the drum counter indicates 1 to 100 counts.
40055101TH Rev.4
Photointerrupter
Hardware Configuration of Toner Sensor
Agitation bar (iron)
Magnet
Toner sensor lever
Magnet draw-in
t1
T
Image drum unit
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