Xerox Phaser 6120 Service Manual page 253

2nd Transfer Roller Cleaning
Imaging Unit 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.
.
Transfer Belt
Operation Timing
The 2nd Transfer Roller cleaning sequence is carried out under any of the following
conditions:
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 (SL4)
2nd transfer cleaning bias
Phaser® 6120 Color Laser Printer Service Manual
2nd Transfer Roller
After Transfer Belt cleaning
Pressed
7-33
Print Engine Theory of Operation
4139to2082e0
Retracted
4139to2083e0