2Nd Transfer Roller Cleaning - Konica Minolta magicolor 2490MF Service Manual

13. Image transfer section
13.3.4

2nd transfer roller cleaning

• DC positive and negative transfer bias voltages are alternately applied to the 2nd transfer
roller. This allows toner residue on the surface of the 2nd transfer roller to be transferred
back to the transfer belt, thus cleaning the 2nd transfer roller.
• The toner transferred back to the transfer belt is collected by the cleaning blade.
A. Operation timing
The 2nd transfer roller cleaning sequence is carried out under any of the following timings.
• Power switch is turned ON
• Cover is opened and closed
• A media error occurs during a print cycle.
• A paper empty condition occurs during a print cycle.
• A paper size error occurs during a print cycle.
Pressure/Retraction Solenoid /
2nd Image Transfer (SD4)
2nd transfer cleaning bias
46
Transfer Belt
After Transfer Belt cleaning
Pressed
Theory of operation ver. 1.0 July. 2006
2nd Transfer Roller
4139to2082e0
Retracted
4139T2E572AA