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Toner density control
Toner density control is conducted using the TARGET value as the reference which is
the toner sensor initial output value set by maintenance item U130 when developer is
loaded for the first time.
Toner sensor
output voltage (V)
Toner empty detection
level
Toner empty reset level
Toner feed start level
(TARGET by U130)
Toner feed stop level
Copying
Toner being replenished message
Toner request message
(Toner cartridge to be replaced.)
Aging:
1 min: during copying
AB CD EF G H IJ
Figure 1-3-27 Toner density control
A When the toner sensor output voltage exceeds the toner feed start level, the toner feed
motor (TFM) and the toner recycle motor (TRM) operate intermittently—on for 0.5 s and
off for 1.5 s, and on for 1.0 s and off for 1.0 s, respectively—to replenish toner.
B As toner is replenished, the toner sensor output voltage drops below the toner feed stop
level and replenishing stops.
C Both the toner feed motor (TFM) and toner recycle motor (TRM) operate intermittently—
on for 0.5 s and off for 0.5 s—to replenish toner until the toner sensor output voltage
reaches the toner empty reset level after exceeding the toner feed start level.
D The toner feed motor (TFM) and toner recycle motor (TRM) operate intermittently—on
for 1.0 s and off for 1.0 s, and on for 1.5 s and off for 0.5 s, respectively—to replenish
toner until the toner sensor output voltage reaches the toner empty detection level after
exceeding the toner feed reset level
E When the toner sensor output voltage exceeds the toner empty detection level after
toner replenishing is carried out, the toner being replenished message appears. Both the
toner feed motor (TFM) and toner recycle motor (TRM) then operate intermittently—on
for 1.5 s and off for 0.5 s—for 1 min. for aging. If the voltage fails to fall to the toner empty
reset level, the toner request message appears.
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