Epson LX-300+II Reference Manual page 114

Follow these steps to install or replace the ribbon cartridge:
1. Make sure the printer is turned off.
Warning:
w
If you have just used the printer, the print head may be hot; let it
cool for a few minutes before replacing the ribbon cartridge.
2. Open the printer cover to the upright position, then pull it
up to remove it.
3. Make sure the print head is in the middle of the printer.
(If not, make sure it is not hot, then use your hand to slide it
to the middle.)
4. Remove the used ribbon cartridge from the printer.
5. Remove the new ribbon cartridge from its package and turn
the ribbon-tightening knob in the direction of the arrow to
remove any slack from the ribbon so it is easier to install.
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Options and Consumables