Epson STYLUS PRO 9000 User Manual page 116

Note:
If you remove an ink cartridge and then reinstall it, the printer
cannot determine the correct level of ink remaining and the
corresponding Ink Out light may not flash to warn you even when
the cartridge is almost out of ink. After transporting the printer,
install unused ink cartridges.
Ink cartridges
Power cord
Interface cable
Paper basket
Roll paper spindles
Roll and cut sheet media
Optional Auto Take-Up Reel Unit (if installed)
3. Make sure that the ink cartridge clamps are in the upright
position (closed), and leaving the ink compartment cover
open, fix the cover and the cartridge clamps in place using
tape.
Maintenance and Transportation
116