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—A General Explanation
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
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 two-pin 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.
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.
System Board Jumpers
Figure A-2 shows the location of the configuration jumpers on the system board. Table A-1 lists the jumpers settings.
Figure A-2. System Board Jumpers
Table A-1. System Board Jumper Settings
Jumper
Setting
Description
PSWD
(default)
The password feature is enabled.
The password feature is disabled.
RTCRST
(default)
The configuration settings in NVRAM are retained at system boot.
The configuration settings in NVRAM are cleared at next system boot.
System Board Connectors
See Figure A-3 and Table A-2 for the location and description of system board connectors. Figure A-3 also indicates expansion slots and bus operating speeds.
The system's software security features include a system password and an admin password, which are discussed in detail in "Using the System Setup Program" in your User's Guide. The password jumper enables these password features or disables them and clears any password(s) currently in use.
CAUTION: Only trained service technicians are authorized to remove the system cover and access any of the components inside the system. Before performing any procedure, see your Product Information Guide for complete information about safety precautions, working inside the computer and protecting against electrostatic discharge.
Turn off the system, including any attached peripherals, and disconnect the system from the
electrical outlet.
Open the system. See "Opening the System" in "Troubleshooting Your System."
Move the PSWD jumper to the disabled position. See Figure A-2 and Table A-1.
Close the system. See "Closing the System" in "Troubleshooting Your System."
Reconnect the system to its electrical outlet and turn the system on, including any attached
peripherals.
The existing passwords are not disabled (erased) until the system boots with the password jumper plug in the disabled position. However, before you assign a new system and/or admin password, you must move the jumper to the enabled position.
Turn off the system, including any attached peripherals, and disconnect the system from the
electrical outlet.
Open the system. See "Opening the System" in "Troubleshooting Your System".
Move the PSWD jumper from the disabled position to the enabled position. See Figure A-2
and Table A-1.
Close the system. See "Closing the System" in "Troubleshooting Your System".
Reconnect the system to its electrical outlet and turn the system on, including any attached
peripherals.
Assign a new system and/or admin password.
To assign a new password using the System Setup program, see "Using the System Setup Program" in your User's Guide.
(default)
(default)
