Ricoh B089 - Toner Density Control

DEVELOPMENT
B089/B093 2-38 SM
2.7.6 TONER DENSITY CONTROL
Overview
There are four modes for controlling toner supply as shown in the following tables.
The mode can be changed with by SP2-921. The factory setting is sensor control 1
mode.
Basically, toner density 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).
TD Sensor Initial
Setting (Vts)
ID Sensor Output
(Vsp/Vsg)
Vt Reference
Voltage Update
Vt Reference
Voltage (Vref)
TD Sensor Output
(Vt)
Toner Supply Clutch On Time
Calculation
New Vref
Vref Update
B027D517.WMF