2A3/4
1-3-29
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.
Summary of Contents for Ri 4230
Page 3: ...SERVICE MANUAL Ri 4230 5230 ...
Page 13: ...4230 5230 S M MCA THEORY AND CONSTRUCTION SECTION I I Theory and Construction Section ...
Page 14: ...1 1 5 2A3 4 CONTENTS 1 1 Specifications 1 1 1 Specifications 1 1 1 ...
Page 100: ...4230 5230 S M MCA ELECTRICAL SECTION II II Electrical Section ...
Page 119: ......
Page 138: ......
Page 159: ...4230 5230 S M MCA III Set Up and Adjustment Section III SET UP AND ADJUSTMENT SECTION ...
Page 448: ...2A3 4 3 6 3 25 Toner scatters at the leading edge of the image See page 3 6 17 ...