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Jumpers, Switches, and Connectors

Dell™ PowerEdge™ 1600SC Systems Installation and Troubleshooting Guide

  Jumpers—A General Explanation

  System Board Jumpers

  System 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

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.

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

J11 pins 1 and 2

  (default)

The password feature is disabled.

The password feature is enabled.

J11 pins 3 and 4

  (default)

The configuration settings in NVRAM are retained at system boot.

The configuration settings in NVRAM are cleared at next system boot (see "Resetting Corrupted BIOS Configuration" in "Troubleshooting Your System").

 jumpered      unjumpered

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.

Figure A-3. System Board Connectors

Table A-2. System Board Connectors

Connector

Description

BATTERY

System battery

CHASSIS INTRUSION

Chassis intrusion switch

COM1/LPT/VGA

Serial, parallel, and video

CPUn

Microprocessors (2)

CPUn FAN

Microprocessor fan power (2)

DIMMx

Memory modules (4)

DRACIII/XT

Systems management

FDD

Diskette drive

FRONT PANEL

Front-panel switches and indicators

FRONT SYS FAN

Front system fan power

KB/MS

PS/2 keyboard and mouse

LAN

NIC

PRIMARY IDE

Primary IDE

PWR CONN

System board power

SCSI CONN

SCSI controller

SCSIB CONN

SCSI backplane

SECONDARY IDE

Secondary IDE

SLOTn

Expansion slots:

  • 1–2: 64-bit/66-MHz PCI
  • 3–4: 64-bit/100-MHz PCIX
  • 5–6: 32-bit/33-MHz PCI

REAR SYS FAN

Back system fan power

USB

USB (2)

12V

System board power

NOTE: For the full name of an abbreviation or acronym used in this table, see "Abbreviations and Acronyms."

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: 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. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.

  2. Remove the cover (see "Removing the Cover" in "Troubleshooting Your System").

  3. Lay the system on its right side.

  4. Remove the password jumper plug.

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

  1. Stand the system upright.

  2. Install the cover (see "Installing the Cover" in "Troubleshooting Your System").

  3. 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 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.
  1. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.

  2. Remove the cover (see "Removing the Cover" in "Troubleshooting Your System").

  3. Lay the system on its right side.

  4. Install the password jumper plug.

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

  1. Stand the system upright.

  2. Install the cover (see "Installing the Cover" in "Troubleshooting Your System").

  3. Reconnect the system to its electrical outlet and turn the system on, including any attached peripherals.

  4. 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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