Ricoh Robin Service Manual page 56

24 June 1994
6.6 TONER SUPPLY AMOUNT
This copier has two different ways of controlling the amount of toner supplied.
Normally, the detect supply mode controls toner supply; however, a fixed
supply mode also can be selected by SP30.
6.6.1 Detect Supply Mode (SP30 = 0)
The amount of toner supplied depends on the ID sensor data and the detect
toner supply ratio data. The toner supply clutch on time in each copy cycle is
calculated as follows:
Toner Supply Clutch ON Time = I x T (pulses)
Where :
ID Sensor Data
Vsp/Vsg x 100
(Vsp, if Vsg = 4.0 volts)
0 to 10.3%
(0 to 0.41 volts)
10.3 to 10.8%
(0.41 to 0.43 volts)
10.8 to 11.8%
(0.43 to 0.47 volts)
11.8 to 15.2%
(0.47 to 0.61 volts)
15.2 to 62.5%
(0.61 to 2.5 volts)
(See note below.)
62.5 to more than 100%
(2.5 to 5.0 volts)
NOTE: If this condition is detected two times consecutively, the toner
supply ratio rises to 60% (ID Sensor Data = 348), which is double
that at toner supply level 4.
TONER DENSITY DETECTION AND TONER SUPPLY
I = ID Sensor Data
T = Detect Toner Supply Ratio Data (SP31)
Toner supply level
(Toner supply ratio, SP31 = 0)
No toner supply
(0%)
1
(3.75%)
2
(7.5%)
3
(15%)
4
(30%)
Fixed supply mode
2-37
ID sensor data
0
22
44
87
174
(Toner End level)
N/A
(Abnormal Condition)