Toner Density Control; Toner Empty Detection By The Toner Sensor - Kyocera Mita KM-4530 Service Manual

2BC/D

(2) Toner density control

To maintain the toner density of the developer constant, the toner sensor (TNS) and the toner level sensor (TLDS) detect
the toner density and toner level in the toner hopper respectively. Based on the detection result, toner is fed by turning
the toner feed motor (TFM) and toner agitation motor (TAM) on and off.

(2-1) Toner empty detection by the toner sensor

Toner density control is performed using as the reference the toner control level (FIRST TARGET) set automatically
when maintenance item U130 is run after loading developer.
Toner sensor
output voltage (V)
Toner empty detection level
Toner empty reset level
Toner control level
(FIRST TARGET in U130)
a When the toner sensor output voltage exceeds the toner control level, the toner feed motor (TFM) turns on to feed
toner.
b When the toner sensor output voltage exceeds the toner empty detection level, the toner being fed message appears
and forced toner feed is conducted for up to 5 minutes.
c When the toner sensor output voltage drops to the toner empty reset level, the toner being fed message disappears.
d When the toner sensor output voltage drops to the toner control level, the toner feed motor (TFM) turns off and toner
feed ends.
e If the toner sensor output voltage does not fall to the toner empty detection level after 5-minute's forced toner feed, the
toner request message appears and copies are made based on the conditions set in maintenance item U258.
When toner is replenished into the toner hopper and the toner level sensor (TLDS) turns on, the toner feed motor
(TFM) turns on to feed toner. The toner being fed message appears.
f When the toner sensor output voltage drops to the toner empty reset level, the toner being fed message disappears.
g When the toner sensor output voltage drops to the toner control level, the toner feed motor (TFM) turns off, and the
toner feed ends.
2-1-24
Toner being fed message
5 min
Figure 2-1-27 Toner density control
Toner request message
(toner replenishment for toner hopper)
Copying