Epson SUBLIJET IQ R1800 - Manual (Page 12)

Remove the cartridge cover by gently pushing on the right side and twisting to the right as shown
below.
4. Take the cartridge placement sticker and place it over the
existing one on the cartridge bay.
5. Install the cartridge chips as shown in the pictures below. Start by lining up the first chip with
the yellow dot with the yellow ink slot in the cartridge bay. Then line up the second chip with the
black dot with the black slot in the cartridge bay.