Pro 7900 and 9900 Field Repair Guide 10/6/10
PF Slant Adjustment Printer Component, Software Item, LCD Display, Printer Button Page 340.
7. This adjustment pattern will be printed.
Paper Feed Direction
This is what a good pattern looks like.
Each of these 3 lines are equal distant from the top to the bottom. Compare each line to itself, not to each other.
Slight underlap
Slight underlap
Slight overlap