Ricoh FAX2900L Service Manual page 41

PRINTING 21 May, 1999
Bias Control (After Each Page)
At the start and the end of any print process (including the cleaning mode), the
power pack applies 0V to the toner application roller, and +250V to the
development roller. This is to prevent toner from transferring to the drum.
Toner
Development Roller
+ 250V
Toner Application Roller
0 V
Drum Surface Voltage
- 750 V
H547D533.WMF
Note that the voltage difference between the toner application and development
rollers is kept the same as in printing, at 250 V. This keeps the same amount of
toner on the development roller at all times during the print run.
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