Oki OKIFAX 5950 Series Maintenance Manual page 504

DESCRIPTION OF
PRINT OPERATIONS
7) Cleaning
After the end of the transfer, residual toner on the EP (image) drum is attracted to the
cleaning roller temporarily by static electricity to clean the EP (image) drum surface.
8) Cleaning of rollers
The charge roller, transfer roller and cleaning roller are cleaned in the following cases:
• In warning up at power-on time
• In warning up after the cover is opened and closed
• When the number of accumulated sheets is 10 and the printout operation ends
Changes in bias voltage applied to each roller move adhesive toner from the roller to the
EP (image) drum and return it to the developer.
OF5750/5950 Series January 2001
Cleaning roller
Power
supply unit
Cleaning "NO" (V)
DB+ (+300 V)
DB- -265 V
+1500 V
TR+
—
TR-
CB (cleaning) +400 V
CH- -1300 V
B - 12
EP drum
Transfer roller
Cleaning "YES" (V)
—
-265 V
+1500 V
-1100 V
-1350 V
-1300 V