We found that it was neither the thermal paper roll nor the thermal component. The cover did not close tight enough and that caused the print-put to be light or missing printed areas.
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Omni 3700 series terminals (inlcuding the 3740) do not use ink ribbons they are thermal printers which use heat to effectively burn the image/text in the paper. You may be using the wrong paper (3 1/4 thermal is what you need). Sometimes the thermal component goes bad but you can get it fixed through a vendor like CDE although it may cost you upwards of $100-$150.
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