Ricoh B246 SERIES, Manual, Page: 191 / 268

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Toner Near End & End Detection
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After the toner supply clutch has turned on, the
machine checks the toner end sensor.
z
The clutch turns on every copy for at least 16 ms as
part of the toner supply process.
„
If the sensor detects low toner for two consecutive
copies:
z
The toner supply motor turns the toner bottle.
z
If the motor has turned on more than 30 times in the
last 100 copies, “Toner Near End” is displayed.
z
If 1,000 consecutive copies have been made with low
toner, “Toner End” is displayed.
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The toner end sensor is used.
Service manual, section 6.9.7
¾
The sensor is at the bottom of the toner hopper.
Service manual, section 6.9.10, Toner End Detection
ˆ
The slide outlines the steps in the toner end detection process.
Service manual, section 6.9.10, Sensor Control Mode
ˆ
Look at the equation for toner supply, and you will see that the clutch always turns
on for the ‘clutch startup time’ of 16 ms, even if ‘GAIN’ is zero.