Ricoh K-C3 Service Manual page 242

B245/B276/B277/B268/B269 Service Manual
Toner supply amount
Toner end detection
Fixed control 1
Mode
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
Toner end detection
Fixed control 2
Mode
Toner supply decision None
Toner control process Toner is supplied every printed page regardless of Vt.
Toner supply amount
Toner end detection
Toner Density Sensor Initial Setting
The TD sensor initial setting (SP 2214: Developer Initialize) procedure must be done after
replacing the developer. During TD sensor initial setting, the TD sensor is set so that the TD
sensor output is the value of SP 2926 (default: 2.4 V). This value will be used as the standard
reference voltage (Vts) of the TD sensor.
Toner Concentration Measurement
The toner concentration in the developer is detected once every copy cycle. The sensor
output voltage (Vt) during the detection cycle is compared with the standard reference
voltage (Vts) or the toner supply reference voltage (Vref).
Vsp/Vsg Detection
The ID sensor detects the following voltages.
Vsg: The ID sensor output when checking the drum surface
However, the reference voltage used is always Vts.
Varies
Performed
Fixed control 1 (SP 2921, "2"): For designer's use only; do not use in
the field
Fixed (SP 2925)
Performed
Fixed control 2 (SP 2921, "3"): Use temporarily if the TD sensor
needs to be replaced
Fixed (SP 2925)
Not performed
18-Jan-06
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