Oki PT390 Manuel D'utilisation page 26

(3) When using a new paper roll, remove the glued portion of the
paper as well as the part to which adhesive tape is affixed.
Note: Since the glued portion of the paper should not be printed on, remove about
one turn (about 40 cm) of the roll paper from the beginning so that none of
the remaining paper has glue on it.
Any adhesive or other matter remaining from the glue may adhere to the
thermal head and cause a problem, such as voids on printouts. Therefore, do
not forget to remove the glued portion of the paper.
(4) From the front of the printer, pull out the end of the paper as shown
below.
Note: Pull out the paper until enough of it protrudes past the front cover of the
printer.
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