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Jumpers, Switches, and Connectors

Dell™ PowerEdge™ 800 Systems Installation and Troubleshooting Guide

  Jumpers—A General Explanation

  System Board Jumpers

  System Board Connectors

  SCSI Backplane Connectors

  Disabling a Forgotten Password

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 jumper settings.

NOTE: To access the jumpers, remove the memory cooling shroud by lifting the release latch and sliding the shroud toward the front of the system. See Figure 6-1.

Figure A-2. System Board Jumpers

Table A-1. System Board Jumper Settings 

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 

SCSI Backplane Connectors

See Figure A-4 for the location and description of the connectors on the back of the optional SCSI backplane board.

Figure A-4. Connectors on Back of SCSI Backplane

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 Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge.

1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.
   
   
2. Open the system. See "Opening the System" in "Troubleshooting Your System."
   
   
3. Remove the memory cooling shroud by lifting the release latch and sliding the shroud toward the front of the system. See Figure 6-1.
   
   
4. Remove the password jumper plug.
   
   

See Figure A-2 to locate the password jumper on the system board.

5. Replace the memory cooling shroud.
   
   
6. Close the system. See "Closing the System" in "Troubleshooting Your System."
   
   
7. 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.

8. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.
   
   
9. Open the system.
   
   
10. Remove the memory cooling shroud.
    
    
11. Reinstall the password jumper plug in its original position to enable the password protection feature.
    
    
12. Reinstall the memory cooling shroud.
    
    
13. Close the system, reconnect the system to the electrical outlet, and turn on the system.
    
    
14. 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.

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