Epson Stylus Pro 7800 User Manual page 293

10. Make sure REMOVE ALL FOUR INK CARTRIDGES ON THE RIGHT
SIDE appears on the LCD, and then remove all four ink
cartridges from the right ink compartment.
11. Make sure INSTALL C/M/Y CONVERSION CARTRIDGES appears
on the LCD, and then insert three conversion cartridges in the
slots on the right ink compartment.
Maintenance and Transportation
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