This can happen if the ribbon cable snags something while the carriage unit is moving back and forth. We've also seen head cables simply wear through from rubbing against the bottom of the ribbon cartridge after years of use. If the ribbon cable(s) connecting the print head to the main board is damaged, one or more of the signals to fire a pin will not reach the head. While a broken pin is the most common reason a row of dots does not appear, it’s also possible that the signal to fire the pin is not reaching the print head. There are, however, other reasons a pin may fail to strike the paper! If nothing else is damaged, repairing the problem is as simple as replacing the head. The pins simply break off and the remaining portion of the dot wire is too short to impact the paper. The most common print quality problem with dot matrix printers is a, "missing horizontal line of dots." For business applications, such as invoicing, the pins responsible for underlining, or crossing letters like A, E, H, etc., will usually fail first because they’re doing more work than the others are. The basics, that apply to all dot matrix heads. Epson dot matrix, print head technical information.
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