Konica Minolta bizhub C658 Service Manual page 1823

bizhub C658/C558/C458/C368/C308/C258
Example: bizhub C368/C308/C258
6.4.9 Toner empty detection control
NOTE
▪ For the life of the toner cartridge, refer to
Consumable/part replacement time (bizhub
(1) Toner near empty detection
• The toner empty sensor provided for the toner hopper of each color of toner is used to determine the amount of toner still available for
use in the toner hopper.
• The cam that is mounted coaxially with the detection plate moves up and down depending on the remaining amount of the toner. Thus,
the toner empty sensor detects the condition.
• If the near empty counter exceeds 3 during control of replenishing the toner hopper with toner, a toner near empty condition is
considered. As a result, it prompts to perform the toner empty control.
• For details of the toner replenishing control, see "
[6]
[5]
[1] Detection plate
[3] Toner conveying screw
[5] Actuator
(a) Toner near empty detection timing
• The toner replenishing control is started when the drive of the toner supply motor is started.
• The output of the toner empty sensor is monitored for a predetermined period of time. If the toner empty sensor is turned ON from the
OFF state, during the predetermined period of time, the machine determines that the "toner hopper runs out of toner (or there is only a
small amount of toner left in the toner hopper)" and increments the near empty counter by one.
• If the toner empty sensor remains OFF, the machine determines that "toner is still available for use in the toner hopper", resetting the
near empty counter to zero.
• These operations are repeated. When the near empty counter reaches the predetermined value, the machine determines that the
toner hopper is in the near empty condition. Then, it shows the message "Toner is low. Replace when indicated" on the control panel.
(2) Resetting the toner near empty and toner empty conditions
• Either the "auxiliary toner replenishing control for toner hopper" or "auxiliary toner replenishing control for developing unit" is performed
(both may be performed in some cases) after a toner near empty condition and a toner empty condition have been detected.
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 6. TONER
F.6.1 Consumable/part replacement time (bizhub C368/C308/C258)
C658/C558/C458).
O.6.4.2 Toner replenishing from toner bottle to toner
[1]
[4]
[2]
[3]
[2] Toner agitating blade
[4] Cam (operatively connected to toner agitating blade
shaft)
[6] Toner empty sensor
O-48
SUPPLY SECTION
and F.6.2
hopper".