Ricoh FT 4015 Service Manual page 48

TONER SUPPLY 20 December 1996
6.6.3 Toner End Recovery
If the main switch is turned off and on, or the front door is opened and closed
during a toner end condition, the machine checks the toner bottle for
replacement. The main motor turns on and the toner supply motor is
intermittently energized. If the TD sensor voltage does not recover from level
7 within 40 seconds, the machine stops, keeping the toner end condition. If
the TD sensor voltage becomes lower than V +3S/5 in this period, the
TS
machine recovers from the toner end condition. Then the toner supply motor
stops, but the main motor continuously rotates for 40 seconds to distribute
toner evenly inside the development unit.
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