Mita PointSource Ai 3010, Service Manual

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1-3-23
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 feed start level
(TARGET set by U130)
Toner feed stop level
Copying
Toner being replenished message
(forced toner feed)
Toner request message
(Toner cartridge to be replaced.)
180 s
AB C D E F
Figure 1-3-20 Toner density control
A
If the toner sensor output voltage exceeds the toner feed start level 3 s after the
drive motor (DM) has turned on (end of toner empty detection inhibit time), the toner
feed motor (TFM) turns on to replenish toner.
B
As toner is replenished, the toner sensor output voltage falls until it drops below the
toner feed stop level and replenishing stops.
C
When the toner sensor output voltage exceeds the toner empty detection level after
toner replenishing is carried out, the toner being replenished message appears
disabling copying and forced toner feed starts. If the toner sensor output voltage fails
to fall to the toner feed stop level within 180 s of the start of forced toner feed, the
toner request message appears.
D
When toner is replenished, the toner sensor output voltage falls until it drops below
the toner feed stop level and replenishing stops. After 60 s aging (15 s while
copying) the toner being replenished message disappears and copying is enabled.
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