Epson 4000 - Manual (Page 56)

Setting jumpers
To move a jumper from one position to the other, use
needle-nose pliers or tweezers to pull it off its pins and
gently move it to the desired position.
Caution
Be careful not to bend the jumper pins or damage any
components on the main system board.
4. Replace any option cards you removed. See page 4-14 for
instructions.
Installing and Removing Options 4-9