Konica Minolta bizhub C658 Service Manual page 1819

bizhub C658/C558/C458/C368/C308/C258
[6]
[5]
[1] Detection plate
[3] Toner conveying screw
[5] Actuator
6.4.4 Auxiliary toner replenishing control for toner hopper
• If the amount of toner in the toner hopper is likely decreasing, control is performed to supply toner forcibly from the toner cartridge to the
toner hopper.
• The machine prohibits initiation of any new print cycle while the auxiliary toner replenishing control is being executed.
(1) Toner hopper auxiliary toner replenishing control execution timing
• Rotate the toner cartridge motor for a predetermined time to supply toner from the toner cartridge to the toner hopper under one of the
following conditions:
"The toner replenishing menu is performed from the Service Mode"
"The toner cartridge is replaced with a new one after a toner empty condition is detected in the toner cartridge (toner empty reset control
is performed)"
"The developing unit is replaced with a new one (developing unit new article detection control is performed)"
"The toner replenishing menu is manually performed from the Service Mode"
(2) Toner hopper auxiliary toner replenishing control end timing
• The auxiliary toner replenishing control is terminated under any of the following conditions:
"A predetermined period of time elapses after the toner cartridge motor has been energized"
"The front door is opened and closed"
"An error or malfunction occurs"
"The machine enters the power save or sleep mode"
6.4.5 Auxiliary toner replenishing control for developing unit
• If the T/C ratio detected by the TCR sensor is equal to, or lower than, a predetermined value at the start of a print cycle, initiation of the
print cycle is prohibited and the developing unit is replenished with toner from the toner hopper until the T/C value reaches the
predetermined value. (for a period of about 5 min. maximum)
• The auxiliary toner replenishing control for developing unit is terminated as soon as the predetermined T/C ratio is recovered. It is also
terminated if the auxiliary toner replenishing control for developing unit is repeated ten sets. Also, it will be terminated when a toner empty
condition is detected in the toner cartridge.
(1) Operation flow
• When the auxiliary toner replenishing control is performed, the following operations will also be performed. Agitate the toner hopper,
calculate the T/C ration with the TCR sensor for each color, and replenish toner from toner cartridge to the toner hopper are performed.
• The auxiliary toner replenishing control is performed for a maximum of about 5 min.
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 6. TONER
[1]
[4]
[2]
[3]
[2] Toner agitating blade
[4] Cam (operatively connected to toner agitating blade
shaft)
[6] Toner empty sensor
O-44
SUPPLY SECTION