Toner Density Control - Ricoh B121 Service Manual

6.9.6 TONER DENSITY CONTROL

Overview
There are four modes for controlling toner supply as shown in the following tables,
which can be changed with by SP2-921. The factory setting is sensor control 1
mode.
Basically, the toner concentration in the developer is controlled using the standard
TD sensor voltage (Vts), toner supply reference voltage (Vref), actual TD sensor
output voltage (Vt), and ID sensor output data (Vsp/Vsg).
SM
Toner Supply Motor On Time
Calculation
TD Sensor Output
(Vt)
Vt Reference
Voltage (Vref)
New Vref
Vt Reference
Voltage Update
Vref Update
ID Sensor Output
(Vsp/Vsg)
TD Sensor Initial
Setting (Vts)
6-43 B121 Series/B259 Series
DEVELOPMENT
B121D949.WMF