Xerox Phaser 6121MFP Service Manual page 76

Theory of Operation
Transfer Belt Cleaning
2-34
The Transfer Belt Cleaning Blade collects residual toner off the surface of the
Transfer Belt, and a toner collecting auger transfers waste toner to the Imaging
Unit reservoir. The prevention seal is affixed to prevent waste toner from leaking
through a gap above the cleaning blade.
During color printing, an image is formed on the Transfer Belt for each color. The
cleaning blade uses a retraction mechanism to lift off the belt during the printing
process. However, no pressure/retraction sensor is used to trigger cleaning blade
retraction. Instead, the IDC sensor detects a sample image on the Transfer Belt to
control the pressure/retraction operation. During monochrome printing, no
retraction sequence is needed. The cleaning blade is normally in contact with the
Transfer Belt.
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Phaser 6121MFP Service Manual