Ricoh FT 4015 - Td Sensor Check and Toner Supply Timing

6.4 TD SENSOR CHECK AND TONER SUPPLY TIMING
The TD sensor voltage is monitored for two seconds when the 1st copy drum
charge starts. The CPU checks the voltage every 40 ms and stores the
second highest voltage of every 240 ms period. The stored voltages during
the two seconds are averaged, and then the average is used as the TD
sensor value for that detection period. The related amount of toner is added
by the toner supply motor (as described in Toner Supply Amount). The TD
sensor is monitored for two-second intervals is until the last original scan is
finished. Unlike a toner supply clutch mechanism, with a toner supply motor,
the copier can add toner during image development.
Original Scan
Drum Charge
TD Sensor
Toner Supply Motor
2 s
(seconds)
2 s
A219D540.wmf
TONER SUPPLY 20 December 1996
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