This section provides specific information about the system jumpers. It also provides some basic information on jumpers and switches and describes the connectors on the various boards in the system.
Jumpers 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 circuit boards 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 shows an example of a jumper.
Figure A-1. Example Jumpers
CAUTION: Ensure that 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-2 shows the location and default settings of the system jumper blocks. See Table A-1 for the designations, default settings, and functions of the system's jumpers.
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 and boot the system. Remove the jumper before restoring the configuration information.)
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. The password jumper enables these password features or disables them and clears any password(s) currently in use.
CAUTION: See "Protecting Against Electrostatic Discharge" in the safety
instructions in your System Information document.
Turn off the system, including any attached peripherals, and disconnect the system
from the electrical outlet.
Remove the cover (see "Removing the Cover" in "Troubleshooting Your System").
Remove the jumper plug from the password jumper.
See Figure A-2 to locate of the password jumper (labeled "PASSWD") on the system board.
Replace the cover (see "Replacing the Cover" in "Troubleshooting Your System").
Reconnect your system and peripherals to their electrical outlets, and turn on the
system.
The existing passwords are not disabled (erased) until the system boots with the password 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.
Turn off the system, including any attached peripherals, and disconnect the system
from the electrical outlet.
Remove the cover (see "Removing the Cover" in "Troubleshooting Your System").
Install the jumper plug on the password jumper.
Replace the cover (see "Replacing the Cover" in "Troubleshooting Your System").
Reconnect your system and peripherals to their electrical outlets, and turn on the
system.
Assign a new system and/or setup password.
To assign a new passwords using the System Setup program, see "Assigning a System Password" and "Assigning a System Setup Password" in the User's Guide.
(default)
(default)
unjumpered 
