This section provides specific information about the jumpers on the system board. It also provides some basic information on jumpers and switches and describes the connectors and sockets on the various boards in the system.
Jumpers and switches provide a convenient and reversible way of reconfiguring the circuitry on a printed circuit board. When reconfiguring the system, you may need to change jumper settings on the system board. You may also need to change jumper and/or switch settings on expansion cards or drives.
Jumpers are small blocks on a circuit board with two or more pins emerging from them. Plastic plugs containing a wire fit down over the pins. The wire connects the pins and creates a circuit. To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated.
Figure A-1. Example Jumpers
WARNING: Make sure the system is turned off before you change a jumper setting. Otherwise, damage to the system or unpredictable results may occur.
A jumper is referred to as open or unjumpered when the plug is pushed down over only one pin or if there is no plug at all. When the plug is pushed down over two pins, the jumper is referred to as jumpered. The jumper setting is often shown in text as two numbers, such as 1-2. The number 1 is printed on the circuit board so that you can identify each pin number based on the location of pin 1.
Figure A-3 shows the location and default settings of the jumper blocks on the system board. See Table A-1 for the designations, default settings, and functions of the system's jumpers.
Switches control various circuits or functions in the system. The switches that you are most likely to encounter are dual in-line package (DIP) switches, which are normally packaged in groups of two or more switches in a plastic case. Two common types of DIP switches are slide switches and rocker switches (see Figure A-2).
Figure A-2. Example Switches
Each of these switches has two positions or settings (usually on and off). To change the setting of a slide switch, use a small, pointed object such as a small screwdriver or a straightened paper clip to slide the switch to the proper position. To change the setting of a rocker switch, use the screwdriver or paper clip to press down on the appropriate side of the switch. In either case, do not use a pen, pencil, or other object that might leave a residue on the switch.
The configuration settings are retained at system boot.
The configuration settings are cleared at next system boot. (If the configuration settings become corrupted to the point where the system will not boot, install the jumper plug and boot the system. Remove the jumper before restoring the configuration information.)
PASSWRD
(default)
The password feature is enabled.
The password feature is disabled.
jumpered
unjumpered
NOTE: For the full name of an abbreviation or acronym used in this table, see
"Abbreviations and Acronyms."
The system's software security features include a system password and a setup password, which are discussed in detail in "Using the System Setup Program" in the User's Guide. A password jumper on the system board enables these password features or disables them and clears any password(s) currently in use.
To disable a forgotten system password or setup password, perform the following steps.
WARNING: See "Protecting Against Electrostatic Discharge" in the safety instructions in the System Information document.
Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.
Refer to Figure A-3 for the location of the password jumper (labeled "PASSWRD") on the system board.
Remove the jumper plug from the PASSWRD jumper.
Close the system doors, and then reconnect the system and peripherals to their electrical outlets, and turn them on.
The existing passwords are not disabled (erased) until the system boots with the PASSWRD jumper plug removed. However, before you assign a new system and/or setup password, you must install the jumper plug.
NOTE: If you assign a new system and/or setup password with the jumper plug still removed, the system disables the new password(s) the next time it boots.
Repeat steps 1 and 2.
Install the jumper plug on the PASSWRD jumper.
Close the system doors, reconnect the system and peripherals to their electrical outlets, and turn them on.
Assign a new system and/or setup password.
To assign a new system password using the System Setup program, see "Assigning a System Password" in the User's Guide. To assign a new setup password using the System Setup program, see "Assigning a Setup Password" in the User's Guide.
unjumpered 
