Epson Stylus Pro 7600 Reference Manual page 203

9. If enough ink remains in the ink cartridge(s), go to next
section. If not, NOT ENOUGH INK and RELEASE INK LEVER are
displayed on the LCD panel. In that case, follow the steps
below to replace the ink cartridges.
a) Open the ink compartment cover and set the ink lever
in the up position.
b) Open the package of the new ink cartridge and insert it
into the slot of the ink compartment.
c) After confirming SET INK LEVER is displayd on the LCD
panel, set the ink lever in the down position.
d) Make sure that no error messages are displayed on the
LCD panel.
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