Epson Stylus Pro 4400 Reference Manual page 305

15. Make sure LOWER BOTH INK LEVERS appears on the LCD, and
then lower the ink levers on the right and left ink
compartments.
16. Make sure RAISE THE BOTH INK LEVERS appears on the LCD,
and then raise the ink lever on the right and left ink
compartments.
17. The printer starts charging ink. After a while, ink lever
messages appear on the LCD. When a message appears on the
LCD, raise or lower the ink levers accordingly until READY
appears on the LCD.
Maintenance and Transportation
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