DEVELOPMENT
B044/B045/B046 6-36 SM
6.12.4 TONER DENSITY CONTROL
Overview
Toner concentration in the developer is controlled using the following values:
• Vts:
TD sensor initial setting (1.25V). (Used as reference
voltage when Vref is not available.)
• Vref:
Toner supply reference voltage (calculated value;
periodically updated)
• Vt:
Actual output from TD sensor
• Vsg/Vsp:
Values from ID sensor, where Vsp is the voltage of a
test pattern (the "ID sensor pattern"), and Vsg is the
voltage of the bare drum
Toner is added to the development unit if Vt is higher than the reference voltage.
Reference Voltage
Vts is used as the reference if the PCU has just been installed (since Vref has not
yet been calculated) or if ID sensor correction has been disabled with SP2-927. In
all other cases, Vref is used as the reference.
Toner Density Sensor Initial Setting
The Vts for this machine is 1.25 V. During TD sensor initialization (after
installation of new PCU), the machine adjusts the sensor so that it reads out
1.25V.
TD Sensor Initial
Setting (Vts)
ID Sensor Output
(Vsp/Vsg)
Vref Update
Vref
TD Sensor Output
(Vt)
Toner Supply Clutch ON Time
Calculation
B046D600.WMF
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