OKIDATA OL1200ex, Service Manual

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%2.7 Toner Low Detection
2.7 Toner Low Detection
• Composition
The device consists of the stirring gear which rotates at a constant rate, the stirring bar and the
magnet on the stirring bar. The stirring bar rotates through the link on the protrusion in the stirring
gear.
Toner Low is detected by monitoring the time interval of the encounter of the magnet set on the sensor
lever and the magnet on the stirring bar.
Operation during toner full state
• The stirring bar rotates due to the interlocking with the stirring gear.
• Even when the magnet on the stirring bar reaches the maximum height, since the other side is
being dipped in the toner, the stirring bar is pushed by the stirring gear.
• Operation
Operation during toner low state
• When the stirring bar reaches the maximum height, since there is no resistance provided by the
toner on the other side, it falls to the minimum height due to its own weight. Be-cause of this, the
time interval during which it is in encounter with the magnet of the sensor lever becomes long. By
monitoring this time interval, toner low can be detected.