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2.7 Toner Low Detection
• Hardware configuration of toner sensor
The figure below shows the hardware configuration of the 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.
Image drum unit
Agitation bar (iron)
Magnet
Toner sensor lever
Photointerrupter
Hardware Configuration of Toner Sensor
• Toner detection method
(1) Toner sensor monitoring conditions are shown in the figure below.
t1
T
Magnet draw-in
Toner sensor