Toner Concentration Measurement; Vsp/Vsg Detection; Calculation Of Vref; Toner Supply Determination - Gestetner B130 Service Manual

DEVELOPMENT

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.
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
1 RV < Vt ≤ RV + S/16
RV + S/16 < Vt ≤ RV + S/8
2
RV + S/8 < Vt ≤ RV + S/4
3
RV + S/4 < Vt ≤ RV + S/2
4
RV + S/2 < Vt ≤ RV + 4S/5
5
RV + S > Vt ≥ RV + 4S/5
6
Vt ≥ RV + S
7
NOTE: The default value for t is 0.6. The value can be changed using SP2-922.
B129 Series/B044 Series
CÓPIA NÃO CONTROLADA
Decision
6-42
CÓPIA NÃO CONTROLADA
Motor On Time (seconds)
t
1.5t
2t
3t
4t
5t
6t
SM