Xerox Phaser 6121MFP Service Manual page 296

Adjustments and Calibrations
6-34
Pattern 3 Function
To print the test pattern for checking image density.
Pattern 3 Use
To check for density level consistency of all four toner cartridges.
Pattern 3 Procedure
1. Select the paper tray.
2. Select Pattern3.
3. Press OK to print the test pattern.
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Phaser 6121MFP Service Manual