Epson SureColor P400 Series Basics Manual page 34

8. Insert the new cartridge into the holder and push it down until it clicks into
place.
9. Once you replace all the necessary cartridges, close the cartridge cover and
push it down until it clicks into place.
10. Close the printer cover.
11. Press the H ink button to begin charging the ink. This takes about
4 minutes. The P power light flashes as the ink charges. The P400 Series will
shake the ink cartridges as it performs Ink Density Optimization. When the
P power light stops flashing and the H ink light goes out, ink charging is
finished.
Caution:
Never turn off the P400 Series while ink is charging or you'll waste ink.
If the H ink light is flashing, press the H ink button, then press down all the
cartridges securely.
If you remove an expended ink cartridge, you cannot reinstall and use the cartridge.
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Maintaining Your Printer