Epson ActionTower 8600 User Manual page 51

The illustration below shows a 3-pin jumper with a 2-3 setting.
Six-pin jumpers are arranged in 2 columns of 3 pins each. The
settings are 1-2, 3-4, and 5-6. Pin 1 is the top left pin. (There is no
notch in the artwork for 6-pin jumpers. Use the orientation of the
writing on the system board to help you identify the top pins.)
The following illustration shows a 6-pin jumper with a 1-2
setting.
To change a jumper setting, follow the steps below. (You may
want to begin by laying the computer on its side.)
1. Refer to the illustration under "Locating the System board
Components" to locate the jumper(s).
2. If any option cards are installed in your computer, you may
need to remove them to access the jumpers; see "Removing
an Option Card" for instructions.
pin 3
pin 2
Dins 1 and 2
pins 3 and 4
Installing and Removing Options 3 - 1 1