Question about Epson LX-300+ II Matrix Printer

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One pin not striking

Its a nine pin printer. 4th or 5th pin is not striking when printing. What to do.

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On most Epson 9pin printers, common causes for a missing dot are:

  • print head, the coil has burned;
  • stuck pin, the print head is held by a single screw and connected by a single flat flex cable. It can be removed and cleaned with electrical contact cleaner and/or WD40;
  • transistor on the logic/controller board. There are two PCBs inside these printers; one for the PSU, the other (bigger) has several medium sized transistor. One row would have 9 of these, one or more would be open (not shorted, if it were shorted, the pin would be leaving a continuous vertical mark on the paper).
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 27, 2008

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