Epson LQ 630S Reference Manual page 127

9. Hold the ribbon cartridge and insert it into the printer as
shown below; then press both sides of the cartridge firmly to
fit the plastic hooks into the printer slots.
10. Slide it into the print head aligning it with the grooves of the
print head until it clicks in place.
Note:
Be sure that the ribbon is not twisted when you slide the ribbon guide
into the print head.
11. Turn the ribbon-tightening knob to remove any slack in the
ribbon so that the ribbon moves freely.
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