Dell Precision WorkStation 420 Service Manual page 43

33 Microphone connector
34 Mouse/keyboard (stacked)
35 System fan power connector
36 Serial port 1/ serial port 2 (stacked)
37 Parallel port/external SCSI port (stacked)
System Board Jumpers
Figure 29 shows the location of the jumpers on the system board.
Figure 29. System Board 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.
NOTICE: Make sure your system is turned off before you change a jumper setting. Otherwise, damage to your system or
unpredictable results may occur.
To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated.
Table 1. System Board Jumper Settings
Jumper Setting
PSWD (default)
RTCRST
jumpered unjumpered
System Board Labels
Table 2 lists the labels for connectors and sockets on your system board, and it gives a brief description of their functions.
Table 2. System Board Connector and Socket Labels
Connector or Socket Label
AGP
BATTERY
CD_IN
DISKETTE
ENET
Description
Password features are enabled.
Password features are disabled.
Real-time clock reset. Can be used for troubleshooting purposes.
Description
Accelerated graphics port card socket
Battery socket
CD-ROM audio interface connector
Diskette/tape drive interface connector
Integrated NIC connector
Table 1 lists the system board jumpers and their settings.