Notes On Use - Oki PT390 Guia Del Usuario

(1) Printing at a high rate might result in unclear printing. If this problem occurs,
adjust the printing rate. Alternatively, adjust the print speed and print density so
that there are no blurs.
(See "Appendix C-3 Setting Up the Printer" in Appendix C, "Special Modes.")
(2) Printing characters from a non-standard character set e.g. in a thin serif font will
result in the characters appearing very faint. Use a bold sans serif font.
(3) For quality printing that is free from uneven spacing and condensed or elongated
printing after paper is cut or printing is paused, resume printing following a paper
feed of at least 1 mm (8 dots).
(4) If the data transfer rate is too low, serial printing may result in uneven print
density (vertical white marks may appear on printouts) because of repeated
printing and pausing. If priority is placed on print quality, use batch printing
mode.
(See "Appendix C-3 Setting Up the Printer" in Appendix C, "Special Modes.")
(5) The upper margin can be set to 12mm or 4.5mm with a command. If the upper
margin is set to 4.5mm, reverse feeding of the paper takes place before the next
printing operation. The paper must therefore be removed after each printing and
cutting operation. If the paper is not removed, the part connected to the roll in
partial cutting could be torn off, or the part that has been cut could be folded back.
Note also that the paper length used per transaction must be at least 30mm.
(6) Printing at a high print density (110% or higher) may cause blurs or uneven print
density on printouts under low-temperature conditions, depending on the print
pattern. If priority is placed on print quality, use a lower print speed.
(See "Appendix C-3 Setting Up the Printer" in Appendix C, "Special Modes.")
(7) Since the difference in hue between red and black or blue and black may not be
noticeable when two-color thermal paper is used, be sure to confirm in advance the
color of the printed characters.
(8) When roll paper with a width of 83 mm is used, characters that are too close to the
(left or right) edge of the paper may not be printed because of inaccuracies in
tracking. Be sure to set a margin of sufficient width.
(9) Do not switch from narrow paper to wide paper (e.g., from paper that is 58 mm
wide to paper that is 80 mm wide) during operation. When narrow paper is used,
the thermal head area where there is no paper comes in direct contact with the
platen roller, and the resulting wear on the head may lead to a deterioration in
print quality. Similarly, if the paper width is changed, the cutter blade will cut at
a location that has no paper, and the resulting wear on the blade may lead to
improper cuts. To switch from narrow paper to wide paper, exchange the thermal
head and the cutter blade.

9. Notes on Use

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