Xerox Phaser 6121MFP Service Manual page 292

Adjustments and Calibrations
Jam Counter
Trouble Counter
Display
Main F/W Version
Engine F/W Version
6-30
Function
Displays the number of misfeeds that have occurred.
Use
When checking for the number of misfeeds that have occurred in the printer or
ADF.
Function
Displays the number of malfunctions detected.
Use
When checking for the number of malfunctions detected.
Function
Displays the version of the controller firmware.
Use
When upgrading the firmware.
When the Image Processor Board has been replaced with a new one.
Function
Displays the version of the engine firmware.
Use
When the Engine Control Board has been replaced with a new one.
Phaser 6121MFP Service Manual