Ricoh FT6645 Manual page 38

23 April 1993
By selecting the proper gain data, the sensor output is set within the targeted
control level (V
REF
illustrated by curve B and the TD sensor initial setting is completed.
The selected gain data is stored in memory, and V
control circuit stays constant during the toner sensor detection cycle.
<Toner Supply Criteria>
At every copy cycle, toner density in the developer is detected once. The
sensor output voltage (V
toner supply level voltage (V
Sensor
Output
(V)
= 2.5 ± 0.1 V). Now, the sensor characteristic is
, V
REF
) during the detection cycle is compared with the
TD
).
REF
5
4
V
TD
3
V
REF
2
1
0
1 2
Toner Weight %
OUT
3 4
2-13
PROCESS CONTROL
from the auto gain
5