Epson SQ-2550 User Manual page 24

WARNING: Never install or remove the ink cartridge
when the power is on line. Always set the printer off
line, and be sure the print head is capped at the left of
the printer before removing or replacing the ink
cartridge.
2. Insert the end of the cartridge with the foil plug into the ink
compartment as shown in the illustration below. Then
gently push the cartridge all the way into the compartment
until you hear the click of the cartridge meeting the back of
the ink compartment.
Setting Up the Printer
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