Konica Minolta bizhub c650 Service Manual page 120

Theory of Operation Ver. 8.0 Jun. 2008
14.3.7 2nd image transfer roller cleaning
• To remove residual toner off the surface of the 2nd Image transfer roller, a +/- DC bias is
applied alternately to the roller, thereby moving the residual toner to the surface of the
transfer belt.
• The cleaning brush then scrapes off the toner on the surface of the transfer belt.
Cleaning brush
A. Operation timing
• The sequence is carried when the power switch are turned ON or the cover is opened
and closed when a print cycle has been abnormally terminated due to a misfeed or mal-
function.
• The sequence is also carried out at the end of a print cycle that is run after the cumula-
tive number of printed pages produced has exceeded 300, or during a print cycle that is
run after the cumulative number of printed pages produced has exceeded 3000, since
the previous cleaning operation.
Paper length in the
sub scanning
direction
216 mm or less
Over 216 mm
2nd image transfer roller cleaning after the completion of a print cycle
Transfer belt motor (M1)
2nd Image Transfer reverse bias
2nd image transfer pressure
retraction motor (M3)
- -
-
-
-
Transfer belt
Print mode Count
Color 3
Monochrome 1
Color 6
Monochrome 2
Start the 2nd image transfer roller cleaning operation
Retracted
Pressure
14. Transfer Corona section
-
-
-
+
2nd Image
transfer roller
HV2
4036ma2175c0
Retracted
A00JT2E517DA
85