HP LineJet Série Guide De Référence Rapide page 39

Using the TOF indicator on the Tractor:
TOF Indicator
Vertical Position
Knob
4.
Locate the TOF indicator on the left or right tractor.
5.
Turn the vertical position knob to align the top of the first print
line with the TOF indicator. The TOF indicator is the small tab
located on the left or right tractor gate. The TOF indicator
should point to the top of the designated first print line.
Note The first print line on the form should be 1/2 inch or more from
the perforation for maximum print quality.
Setting Top-Of-Form
Perforation
39