Epson Equity 4 User Manual page 52

A jumper's setting is determined by where the jumper is
4.
placed on the pins. A two pin jumper either
pins (on) or sits on just one of the pins (off), as illustrated
below.
For three pin jumpers, the jumper connects pin 1 and the
middle pin (position 1-2) or pin 3 and the middle pin
(position 2-3), as shown below.
(In the off position, a three pin jumper sits on only one of the
end pins.)
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.
Be careful not to bend the jumper pins or damage any
surrounding components on the main system board.
5. If you removed the option card connector board, replace it
now. See page 2-22 for instructions.
6. Replace any option cards you removed. See page 2-16 for
instructions.
2-10 Installing and Removing Options
O N
1
OFF
l - 2
connects both
2 - 3