Oki PT390 Manuel D'utilisation page 25

How to attach the separator
Attach the separator at the rear hook for the axis.
Note : Push the separator down until it engages with an audible click, and confirm
that the top of the separator is aligned horizontally.
Note : When using roll paper with a width of 58 or 60 mm, take care not to set the
separator at an angle.
Note : When replacing the separator, set a paper width appropriate to the print
area, referring to Appendix C-3 Setting Up the Printer" in Appendix C,
"Special Modes."
Rear hook for the axis
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Aligned horizontally