DEVELOPMENT
1 October, 1999
2-18
There are four toner density control modes:
Mode
P+T Control (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 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
Fixed Quantity 1
(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 the P+T control
mode. However, the reference voltage used is always Vts.
Toner supply amount
Varies
Toner end detection
Performed
Mode
Fixed Quantity 2
(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 the P+T control
mode.
Toner supply amount
Fixed
Toner end detection
Performed
Mode
T Control
(Use temporary 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
Toner end detection
Not performed
