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The ribbon tension adjustment knob has 3 levels of adjustment. Because the print engine’s ribbon alignment
is to the left side (or right side/ PEX-1200 series) of mechanism, different ribbon width require different
tension to print correctly. Therefore it may require to adjust the ribbon tension knob to get your best print
quality. The biggest tension is #1. Adjust the tension by turning the knobs to suitable # (1, 2 or3) on both
ribbon supply & rewind spindles, suggest the tension # to be the same on both spindles. Factory default
tension is #1.