Epson Stylus Pro 7450 User Manual page 253

10. Make sure REMOVE ALL FOUR INK CARTRIDGES ON THE RIGHT
SIDE appears on the LCD panel, 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 panel, and then insert three conversion cartridges
in the slots on the right ink compartment.
Maintenance and Transportation
253