20 February, 2001 DEVELOPMENT
6-45
Detailed
Descriptions
The four toner density control modes are as follows.
Mode Sensor control 1 (SP2-921, “0”): Normally use this setting only
Toner supply decision Compare Vt with a reference voltage (Vts or Vref)
Toner control process Toner is supplied to the development unit when Vt is higher than
the reference voltage (Vts or Vref). This mode keeps the Vref value
for use with the next toner density control.
Vts is used for the first toner density control after a new PCU has
been installed, until it has been corrected with the ID sensor output.
Vref is used after Vts has been corrected with the ID sensor output
voltage (corrected during the first toner density control for a new
PCU).
Toner supply amount Varies
Toner end detection Performed
Mode
Sensor control 2 (SP2-921, “1”): For designer’s use only; do not use
in the field
Toner supply decision Compare Vt with a reference voltage (Vts)
Toner control process
This toner control process is the same as sensor control 1 mode.
However, the reference voltage used is always Vts.
Toner supply amount Varies
Toner end detection Performed
Mode
Fixed control 1 (SP2-921, “2”): For designer’s use only; do not use
in the field
Toner supply decision Compare Vt with a reference voltage (Vts or Vref)
Toner control process This toner control process is the same as sensor control 1 mode.
Toner supply amount Fixed (SP2-925)
Toner end detection Performed
Mode
Fixed control 2 (SP2-921, “3”): Use temporarily if the TD sensor
needs to be replaced
Toner supply decision None
Toner control process Toner is supplied every printed page regardless of Vt.
Toner supply amount Fixed (SP2-925)
Toner end detection Not performed
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