Epson Stylus Pro 7800 User Manual page 296

16. Make sure INSTALL ALL FOUR INK CARTRIDGES ON THE RIGHT
SIDE appears on the LCD, and then insert the cartridges in
their specified slots.
17. Make sure LOWER THE RIGHT INK LEVER appears on the LCD,
and then lower the ink lever on the right ink compartment.
Make sure LOWER THE LEFT INK LEVER appears on the LCD,
and then lower the ink lever on the left ink compartment.
18. Make sure RAISE THE RIGHT INK LEVER appears on the LCD,
and then raise the ink lever on the right ink compartment.
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Maintenance and Transportation