Epson 24-Pin Dot Matrix Printer LQ-580 - Manual (Page 10)

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Replacing the Ribbon Cartridge
Slide the print head from side to side to
make sure it moves smoothly. Also
check that the ribbon is not twisted or
creased. To replace the paper tension unit, lower
it onto the printer's mounting pegs.
Then press down both ends of the unit
until it clicks into place.
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