Epson LX-810 User Manual page 175

Interface Boards
5. Reattach the push feed tractor.
6. Reattach the ribbon cartridge, paper
CAUTION: When an optional interface board is installed,
be sure to disconnect the printer cable from the printer's
built-in parallel interface. Two interface cables must not
be connected at the same time.
7. Reattach the printer cover and paper guide.
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Using the Printer Options