S-C4L Training
46
Slide 46
Toner Density Control
Toner concentration in the developer is
controlled with these values:
Vts: TD sensor initial set of 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 given to the development unit if Vt is
more than the reference voltage
Toner Density Control
Reference Voltage
Vts is used as the reference if the PCU has just been installed, or if ID sensor
correction is set “off” with SP 2927. Vref is used as the reference at all other
times.
Toner Density Sensor Initial Setting
The Vts for this machine is 1.25 V. The machine adjusts the sensor so that it
reads out 1.25V for TD sensor initialization when a new PCU is installed.
Toner Concentration Measurement
The machine checks concentration every copy cycle, comparing Vt against the
reference voltage to do this.
Vsp/Vsg Detection
An ID sensor pattern is made on the drum by the charge roller and laser diode.
The ID sensor detects the pattern density (Vsp) and the density of the bare drum
(Vsg). Detection is done at the same time as (and immediately before) charge-
roller voltage detection.
You can set ID sensor control “off” with SP 2927.
Calculation of Vref
Vref is calculated based on the ID sensor output (Vsp/Vsg) and the present
reference voltage (Vref or Vts) – Vt.
Toner Supply Determination
The machine gives toner if Vt gets to more than the reference voltage. You can
see current Vt and reference voltage values with SP 2220.
You can see other ID sensor values with SP 2221.
Содержание D109
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