Konica Minolta BizHub C360 Service Manual page 133

12. TONER SUPPLY SECTION
(3) Toner empty display (typical)
NOTE
• A different toner hopper empty display appears if "User" is selected for "Unit
Change" in the Service Mode.
B. Toner empty detection
• The machine determines a toner empty condition by using the toner near empty switch
provided for the toner hopper of each color of toner, the toner supply motor at the toner
hopper, and the TCR sensor provided for the developing unit of each color of toner.
(1) Toner empty detection timing
• The machine determines a toner empty condition when any of the following conditions is
detected after a toner near empty condition has been detected. It then gives the mes-
sage "Toner cartridge needs to be replaced. (snip)" on the control panel.
1. The rotation time of the toner supply motor (amount of toner replenished) exceeds
the predetermined value. (Note, however, that the cumulative rotation time of the
toner supply motor is reset to zero, if the event that "the toner hopper runs out of
toner (or there is only a small amount of toner left in the toner hopper)*" is not
detected by the toner near empty switch within a predetermined period of time after
the toner near empty condition has been detected.)
2. The TCR sensor detects a T/C ratio that is lower than a predetermined value.
*: If the toner near empty switch is turned ON from the OFF state, during the predeter-
mined 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)".
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Theory of Operation Ver. 1.0 Jul. 2009
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