Oki 391 - Manual (Page 46)

46 Microline 390/391 Turbo
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Temporary Top of Form Change
! If you turn the platen knob when the printer is turned
on, you will cause the Top of Form to mis-align.
Always turn the printer off before turning the platen
knob!
! The factory default setting for the Top of Form (where
the printing should begin) is one inch down from the
top of the page.
To change the Top of Form (move it lower) for one page
only:
1 Press SEL to deselect the printer.
2 Press LF to change the position of the Top of Form.