Intermec EasyCoder PX4i User Manual page 65

Chapter 5 — Loading Ribbon for Thermal Transfer Printing
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5 Without releasing the ribbon, turn the printhead lift lever to
"closed" position to lock the ribbon.
6 Press the cardboard core at the front end of the ribbon onto
the rewind hub. During printing, the rewind hub will rotate
counterclockwise.
EasyCoder PX4i Bar Code Label Printer User's Guide (IPL Version)