Toner Replenishing Control; T/C Recovery Mode - Konica Minolta bizhub 164 Service Manual

Theory of Operation Ver. 1.1 Apr. 2010
9.3.2

Toner Replenishing Control

• The amount of toner consumed for the image (number of dots) is calculated for each
print during printing. The calculated value is compared with the T/C ratio read by the
TCR sensor. The main body thereby determines whether to replenish toner or not.
• If toner is to be replenished, the toner bottle is rotated one complete turn.
• The T/C ratio is calculated after the replenishing sequence. If the recalculated T/C ratio is
equal to, or more than, a predetermined value in%, the replenishing sequence is termi-
nated. If the ratio is less than the predetermined value, toner replenishing sequence is
carried out again.
9.3.3

T/C Recovery Mode

• If the T/C ratio is low, the main body forcibly prohibits the initiation of a new print cycle
and recovers the required T/C ratio level.
• Two patterns of control are performed according to the timing at which the T/C recovery
sequence is performed.
A. T/C recovery sequence A
• This sequence is executed when a toner empty condition is detected during a print cycle.
• As soon as a toner empty condition is detected, the print cycle is temporarily interrupted
and toner replenishing sequence is carried out.
The toner supply motor is kept energized for a predetermined
period of time to replenish the toner.
Predetermined T/C or more is recovered.
The toner supply motor is deenergized and,
after a predetermined period of time thereaf-
ter, the main motor is deenergized.
The main motor and toner supply motor are ener-
gized to replenish toner.
T/C is recovered by 1% or more.
9. TONER SUPPLY SECTION
T/C is not recovered by 1% or more.
The main motor and toner supply motor are
deenergized and the toner empty message is
displayed.
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