Epson Stylus Pro 7800 Printer Manual page 131

Caution: Do not remove
and re-insert cartridges
more often than
necessary. Doing so can
compromise the needle
valve seal and allow air to
enter the ink tubes,
causing nozzle damage.
Maintaining and Transporting the Printer
8. Lower the ink levers to their locked position.
9. Close the ink compartment covers.
Once the cartridge is installed, the printer returns to its
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state.
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