Epson Stylus Pro 7500 Reference Manual page 108

To replace an ink cartridge, follow the steps below.
Caution:
c
Leave the old cartridge installed in the printer until you are ready
to replace it with a new one.
1. Make sure the printer is on. Determine which cartridge needs
to be replaced as indicated by the Ink Out light.
2. Open the ink compartment cover.
3. Carefully pull the empty cartridge straight out of the printer.
NO INK CARTRIDGE appears on the LCD panel.
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Maintenance and Transportation