Oki ML5521 User Manual page 7

Top of Form (TOF)
Top of Form (TOF) sets the print start position. The factory default is 1"
from the top.
The TOF can be changed in increments of 1/144", for a single print job
or set to a new default. The overall amount of adjustment is limited to
avoid paper jams.
The first line prints at the red line of the plastic paper shield (1) on the
printhead.
For more information, see "Top of Form (TOF)" in "Using your Printer".
The Forms Tear-Off and the Top of Form settings interact. For more
information, see "Top of Form (TOF) and Forms Tear-Off" in "Using your
Printer".
Turning the Platen Knob
Always turn the printer off before turning the platen knob! If you turn
the platen knob when the printer is on, the Top of Form will misalign.
NOTE
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