Panasonic KX-P8410 Operating Instructions Manual page 26

Setup
26
3
Push down on the metal plate until it clicks, locking it in place.
Fan the media (paper/transparencies), then tap it on a level
4
surface to avoid media jams or skewed printing.
Notes:
B To optimize your printer's performance, always use clean, unused media.
B Be careful not to leave fingerprints on the media, which can result in a smudged
print.
B Reusing media that has been fed through the printer once (for example, after
jams) can reduce the life of the consumables and paper path components.
B The recommended transparency is 3M CG3700. If the print quality is poor, print
on the other side.