Basic Operator's Guide Printer TM-U300A, TM-U300B, TM-U300PA, TM-U300PB

Chapter 3 Installing the Parts
3-1
Installing the Ribbon Cassette
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Installing the ribbon cassette
Be sure to use a ribbon cassette that matches the printer’s specifications.
Open the printer cover.
Turn the ribbon-tightening knob in the direction of the arrow to take up any slack
in the ribbon.