Epson SureColor P5370 - Page 168

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6. Make sure the color of the ink cartridge matches the color of the label on the inside of the ink
cartridge cover, and then insert the ink cartridge until it clicks.
7. Repeat the above steps for any other cartridge that needs to be replaced.
Note: Make sure to install ink cartridges into all slots. You cannot print if any of the slots are empty.