Oki PT390 User Manual page 46

Notes on using the cutter
(1) In full cutting mode, the length of paper per transaction must be within a
range of 58 to 180 mm. If a different paper length is used, the printed paper
may not drop from the paper transport, thus causing a cutting error.
(2) The maximum number of successive cuts by the cutter is 30 cuts per minute
(at least two seconds per cut). Using the cutter at a higher rate may cause a
failure.
(3) Do not pull the paper during cutting. Doing so may cause a paper jam or
another problem.
(4) Each time that a sheet of paper is cut in full cutting mode, the sheet of paper
must be removed.
Notes on printing of barcodes and two-dimensional codes
(1) Barcodes that are rotated 90 degrees or aligned vertically when printed may
not be readable. Verify the readability in advance.
(2) Printouts on label paper or thick paper may contain blurs, depending on
humidity and other environmental conditions. Adjust the print speed and
print density appropriate for the type of paper used, and verify the
readability in advance.
(See "Appendix C-3 Setting Up the Printer" in Appendix C, "Special
Modes.")
(3) The recognition ratio of two-dimensional codes (QR codes, PDF417, and
DataMatrix) varies depending on various factors, including the module
width, print density, ambient temperature, thermal roll paper type, and
reader performance. Adjust the print speed and print density appropriate to
printing two-dimensional codes, and verify the readability in advance.
(See "Appendix C-3 Setting Up the Printer" in Appendix C, "Special
Modes.")
(4) The paper transport accuracy may be negatively affected by printing a
barcode in the Upper margin at the beginning of paper transport or in the
Lower margin at the end of paper transport. Verify the readability before
starting printing.
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