Specifications

= Toner Replenishing Sequence Performed When an Abnormally Low T/C is
Detected =
The ATDC Sensor output voltage applied to pin 80 of IC1A indicates an
abnormally low T/C (T/C is lower than the setting by 2% or more).
(The copier determines that the T/C is abnormally low.)
After the copy cycle has been completed for the paper which had been
taken up and fed in, the next paper take-up sequence is interrupted and,
instead, Sub Hopper Toner Replenishing Motor M15 is energized.
While M15 is being energized (toner is being replenished), ATDC Sensor
UN8 takes readings at about 5 msec. intervals for about 280 msec. to check
for T/C.
Has the T/C increased by 1%?
The toner replenishing sequence is further continued, while UN8 takes
readings at the same timings to check for T/C.
Has the T/C increased by 2%?
•
The readings are taken at the same timings again to check for T/C.
•
If T/C is not increased even after these operations for 80 sec., the copier
shows the following malfunction code on the Touch Panel.
Malfunction Code: C0072 (Defective M15)
<Master Board PWB-A>
M15 is deenergized and the copy
cycle is resumed after the toner
replenishing motion has been
brought to a stop. (Control is now
passed back to normal toner
replenishing by ATDC Sensor.)
YES
NO
YES
NO
•
The readings are taken at the
same timings again to check for
T/C.
•
If T/C is not increased even after
these operations for 140 sec.,
the sequence goes to the next
step.
M-79