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Jumpers, Switches, and Connectors

Dell™ PowerEdge™ 1655MC Systems Installation and Troubleshooting Guide

  Jumpers—A General Explanation

  Server Module Jumpers

  Server Module Board 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 Jumpers

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 server-module jumper blocks. See Table A-1 for the designations, default settings, and functions of the jumpers.

Server Module Jumpers

Figure A-2 shows the location of the configuration jumpers on the server-module board. Table A-1 lists the jumpers settings.

Figure A-2. Server Module Jumpers

Table A-1. Server-Module Jumper Settings 

Server Module Board Connectors

See Figure A-3 and Table A-2 for the location and description of server module board connectors. Figure A-3 also lists expansion slots, buses, and bus operating speeds.

Figure A-3. Server Module Board Connectors

Table A-2. Server Module Board Connectors

Disabling a Forgotten Password

The server module'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: Before you perform this procedure, see "Safety First—For You and Your System" in "Troubleshooting Your System."

CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information Guide.

1. Remove the server module (see "Removing a Server Module" in "Installing System Options").
   
   
2. Open the server module (see "Opening the Server Module" in "Installing System Options").
   
   
3. Remove the password jumper plug.
   
   

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

4. Close the server module (see "Closing the Server Module" in "Installing System Options").
   
   
5. Install the server module (see "Installing a Server Module" in "Installing System Options").
   
   

When the server module is on, the power-on indicator is solid green. Allow the server module to finish booting.

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.

6. Remove the server module (see "Removing a Server Module" in "Installing System Options").
   
   
7. Open the server module (see "Opening the Server Module" in "Installing System Options").
   
   
8. Install the password jumper plug.
   
   

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

9. Close the server module (see "Closing the Server Module" in "Installing System Options").
   
   
10. Install the server module (see "Installing a Server Module" in "Installing System Options").
    
    
11. Assign a new system and/or setup password.
    
    

To assign a new passwords using the System Setup program, see your User's Guide.

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