Ricoh FT4215, Service Training Manual

Page: 74 / 208

6.8 TONER SUPPLY AMOUNT
This copier has two different ways of controlling the amount of toner supplied.
Normally, the detect supply mode controls toner supply for the black
development unit; however, a fixed supply mode also can be selected by
SP30. When the color development unit is installed, the fixed supply mode
controls toner supply regardless of the setting of SP30.
6.8.1 Detect Supply Mode (SP30 = 0)
The amount of toner supplied depends on the ID sensor data, the detect
toner supply ratio data, and the paper size. The toner supply clutch on time in
each copy cycle is calculated as follows:
Toner Supply Clutch ON Time = I x T x P (pulses)
Where: I = ID Sensor Data
T = Detect Toner Supply Ratio Data
P = Paper Size Data
For example: Vsp = 0.65 volts, which means the toner
supply level is "2" and the ID sensor = 29.
The data of SP31 is set to "0".
The toner supply ratio is 15 % and the toner
supply data = 2.
Paper size is A4 or LT.
The paper size data = 1.
Toner Supply Clutch ON Time = I x T x P
= 29 x 2 x 1
= 58 (pulses)
= 232 (m sec.) (1 pulse = 4.0 m sec.)
FT4220/4222 2-43 STM