Intermec PB21 User Manual page 28

Chapter 1 — Using the PB21 and PB31 Mobile Receipt Printer
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2 Insert a roll of media. Make sure you load the media clockwise so
that it pulls off the core from the bottom of the printer.
3 Pull out 8 cm (3 in) of the media, then close the media cover.
4 Press the Feed button to advance the media.
PB21 and PB31 Mobile Receipt Printer User's Guide