Specifications

<Toner Replenishing Control by ATDC Sensor>
•
UN8 samples T/C at the following timings for each copy.
Approx. 20 msec. after a HIGH BASE signal, which is output from pin 2 of
IC2J on PWB-J for each scan motion, has been input to pin 96 of IC5A on
PWB-A, the ATDC Sensor takes readings at about 5-msec. intervals for
about 280 msec. (i.e., taking about 56 readings).
<ATDC Sampling Timing>
•
The ATDC Sensor output voltages are applied to pin 80 of IC1A on PWB-A.
The value of the readings sampled is compared with the "T/C control level
set by AIDC Sensor control" and toner is replenished in either of the
following four modes (the figures are based on A4 paper).
Compared with T/C
Control Level
Toner
Replenishing
Time (T1)
Amount
Replenished
➀
Large amount
replenishing
Lower by 0.5% or more 980msec. (*1) Approx. 163 mg
➁
Small amount
replenishing
Lower by less than 0.5% 700msec. (*1) Approx. 117 mg
➂
Fixed amount
replenishing
Higher by less than 1% 70msec. (*1) Approx. 12 mg
➃
No toner
replenishing
Higher by 1% or more  
The toner replenishing time and the amount of toner replenished vary
according to the paper size.
(*1): M15 is actually energized 50 msec. earlier to take into account the
rise time of the motor.
<NOTE>
1075T105CA
BASE Signal
T1 msec.
ON
ON
Approx. 280 msec.
Approx. 20 msec.
Approx. 5 msec.
ATDC Sensor Sampling
Sub Hopper Toner
Replenishing Motor (M15)
T1 msec. : Varies with the ATDC Sensor output voltage and paper size.
For details, see below.
M-77