Ricoh FAX2900L Service Manual page 40

21 May, 1999
Development Bias
[B]
[D]
[A]
The power pack [A] applies one voltage to the toner application roller [B] and toner
metering blade [C], and a different voltage to the development roller [D].
Bias Control (During Printing)
The power pack applies a charge of -650V to the toner application roller, and
-400V to the development roller. Toner transfers from the toner application roller to
the development roller and on to the laser-exposed areas on the drum as shown
below.
Print Data
G N D
- 200V
- 400V
- 650V
- 750V
H547D518.WMF
White Black
2-13
PRINTING
[C]
Toner
Drum Exposed Area
Development Roller
Toner Application Roller
Drum Surface Voltage
H547D531.WMF