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 jumper.
Figure A-1. Example Jumper
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 with a triangle 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 server-module jumper blocks. See Table A-1 for the designations, default settings, and functions of the 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
PASSWD
(default)
The password feature is enabled.
The password feature is disabled.
NVRAM_CLR
(default)
The configuration settings in NVRAM are retained at system boot.
The configuration settings in NVRAM are cleared at next system boot.
jumpered
unjumpered
System Board Connectors
See Figure A-3 and Table A-2 for the location and description of the system board connectors.
Figure A-3. System Board Connectors
Table A-2. System Board Connectors
Connector
Description
BT1
Connector for the 3.0 V coin battery
CN2
12 V and 3.3 V power connector for the system board
CN3
+5 V and -12 V power connector for the system board
CN4
Daughter card connector (not supported)
DIMMn_x
Memory modules (4)
J7
Control panel interface connector
Sys_Mgmt
Connector for the remote access controller (RAC)
Fan
Power connector for the fan assembly
Pri-IDE
CD drive interface connector
SATA_PORT_n
Connectors for the SATA hard drives
SLT1
Riser board interface connector
Riser Board Connectors
See Figure A-4 and Table A-3 for the location and description of the backplane board connectors.
Figure A-4. Riser Board Connectors
Table A-3. Riser Board Connectors
Connector
Description
Upper slot PCI 32-bit, 33 MHz (5V)
The RAC must be installed in the upper slot.
Lower slot PCI-X 64-bit, 66 MHz (3.3V)
For optimal performance, install RAID and SCSI controllers in the lower slot.
System board
System board interface connector.
Disabling a Forgotten Password
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 your User's Guide. The password jumper enables these password features or disables them and clears any password(s) currently in use.
CAUTION: See your System Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge.
Turn off the system and attached peripherals, and disconnect the system from the electrical
outlet.
Open the system. See "Opening the System" in "Troubleshooting Your System."
Remove the password jumper plug.
See Figure A-2 to locate the password jumper on the system board.
Close the system. See "Closing the System" in "Troubleshooting Your System."
Reconnect the system to the electrical outlet, 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.
Open the system.
Install the password jumper plug.
See Figure A-2 to locate the password jumper on the system board.
Close the system, reconnect the system to the electrical outlet, and turn on the system.
Assign a new system and/or setup password.
To assign a new password using the System Setup program, see "Using the System Setup Program" in your User's Guide.
(default)
(default)
jumpered 
unjumpered
