DEVELOPMENT
SM 6-37 B044/B045/B046
Detailed
Descriptions
Toner Concentration Measurement
The machines checks concentration every copy cycle, by comparing Vt against
the reference voltage.
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 carried out at the same time as (and immediately before) charge-
roller voltage detection (☛ 6.11.2).
NOTE: Use of ID sensor control can be disabled with SP2-927.
Calculation of Vref
Vref is calculated based on:
• ID sensor output (Vsp/Vsg)
• Existing reference voltage (Vref or Vts) – Vt
Toner Supply Determination
The machine supplies toner if Vt exceeds the reference voltage.
NOTE: Current Vt and reference voltage values can be viewed using SP2-220.
Other ID sensor values can be viewed using SP2-221.
Toner Clutch ON Time
Calculation is based on:
• Vt
• Reference voltage RV (= Vref or Vts)
• S (TD sensor's sensitivity coefficient)
Level Decision Motor On Time (seconds)
1
RV < Vt ≤ RV + S/16
t
2
RV + S/16 < Vt ≤ RV + S/8
1.5t
3
RV + S/8 < Vt ≤ RV + S/4
2t
4
RV + S/4 < Vt ≤ RV + S/2
3t
5
RV + S/2 < Vt ≤ RV + 4S/5
4t
6
RV + S > Vt ≥ RV + 4S/5
5t
7
Vt ≥ RV + S
6t
NOTE:
The default value for t is 0.6. The value can be changed using SP2-922.
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