Epson EPI-4000 User Manual page 36

2. Hold the cartridge with your thumb over the raised triangle at
one end. Insert the end opposite the triangle into the ink
compartment, as shown below. The ink level indicator should be
in the lower right corner.
3. Push the cartridge gently into the compartment until you feel it
contact the back of the compartment and you hear it snap into
place.
Assembling the Printer
Setting Up the Printer
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