Epson STYLUS PRO 4400 Reference Manual page 290

1. Make sure the printer is on. Find out which cartridge needs
to be replaced, as indicated by the steady or flashing Ink check
light.
2. Open the ink compartment cover by pushing it.
3. Raise the ink levers to the released position.
Note:
The right ink compartment is available for EPSON Stylus Pro 4800
only.
290 Maintenance and Transportation
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