Epson Stylus C86 - Manual (Page 25)

Removing and Installing Ink Cartridges 25
6. Before you remove the new cartridge from its package, shake it four or five
times.
7. Unwrap the new ink cartridge and lower it into the holder. Push down gently
until the cartridge is firmly seated.
Caution:
Don’t touch the green circuit board on the front of the cartridge; you may inhibit
normal operation and printing.
8. If you need to replace other ink cartridges, repeat steps 5 through 7 before
continuing with step 9.
Don’t touch
the green part