Epson DFX-9000 - Manual (Page 137)

Options and Consumables 137
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6. Hold the ribbon cartridge with both hands and lower it into
the printer as shown below. Pulling the cartridge toward you,
slide the notches nearest you over the two corresponding pins
in the printer.
7. Push the cartridge down into position until the other two slots
snap into place over the mounting pins in the printer.
8. Press lightly on both sides of the cartridge to make sure it is
locked in place.