Ricoh Robin Service Manual page 28

24 June 1994
2.6 GRID VOLTAGE FOR TONER DENSITY DETECTION AND
RESIDUAL VOLTAGE (Vr) DETECTION
The guid voltage is the same for both toner density detection and residual
voltage correction.
Grid voltage = Standard ID sensor grid voltage (–460 volts [SP62=4])
Drum Wear Correction Factor (SP57)
Main motor rotation time (SP57)
0 to 2H
2 to 65H
65 to 112H
112 to 157H
More than 157H
The grid voltage for toner density detection is the same as it is for the
residual voltage (Vr) detection. However, the development bias voltage is
different. (See page 2-30 and 2-35.)
+
Drum wear correction factor (SP57)
Change of grid voltage (volts)
2-9
DRUM CHARGE
±0
–20
–40
–60
–80