Expansion-Card Guide; Control Panel - Dell Precision WorkStation 420 Service Manual

NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting
the chassis intrusion detector.

Expansion-Card Guide

Figure 8. Expansion-Card Guide Removal
To remove the expansion-card guide, perform the following steps:
1. Remove the hard-disk drive
2. Face the computer from the front.
From the outside of the chassis, press in with your fingers on the two tabs on the left side of the expansion-card guide (see Figure 8). This
will release the left tabs of the card guide from the chassis.
3. Rotate the released side of the card guide away from the chassis.
The left side of the card guide will swing away from the chassis. With the left side of the card guide away from the chassis, you can then pull
the card guide back and out of the chassis, which releases the two right tabs.

Control Panel

Figure 9. Control Panel Removal
CAUTION: Before you remove the computer cover, see
To remove the control panel, perform the following steps:
1 Left tabs (2)
2 Right tabs (2)
bracket.
1 Thermal sensor cable
2 Control panel cable
3 Screw
4 Speaker cable
5 Chassis intrusion switch
cable
6 Control panel
7 Alignment hole
8 Guide pin
"Precautionary Measures"