Dell Precision WorkStation 420 Service Manual page 16

22 Auxiliary hard-disk drive access LED connector
23 PCI expansion slots
24 AGP graphics slot
25 Remote wakeup on LAN connector
26 Primary processor 0 socket
27 Network cable connector
28 Diagnostic LEDs
29 USB connectors
30 Secondary processor 1 socket
31 Line-in connector
32 Line-out connector
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 23 shows the location of the jumpers on the system board.
Figure 23. 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
Description
Password features are enabled.
Password features are disabled.
Real-time clock reset. Can be used for troubleshooting purposes.
Table 1 lists the system board jumpers and their settings.