Dell Precision 620 - Manual (Page 17)

To remove the expansion-card guide cooling fan, perform the following steps.
1. Remove the computer cover according to the instructions in " Computer Cover ."
2. Rotate the power supply away from the system board.
3. Remove the expansion-card guide and fan .
4. Squeeze the tabs on the end of the fan bracket and slide the fan out of the expansion-card guide ( see Figure 24 ).
Control Panel
Figure 25. Control Panel Removal
To remove the control panel, perform the following steps:
1. Disconnect the control panel cable from the PANEL connector on the system board (see Figure 28 for the location of the PANEL connector).
2. Remove the mounting screw that secures the control panel to the hard-disk drive cage door.
3. Disconnect the chassis intrusion switch cable connector from the control panel.
4. Disconnect the thermal cable connector from the control panel.
5. Disconnect the speaker cable connector from the control panel.
6. Remove the control panel from the chassis.
Chassis Intrusion Switch
Figure 26. Chassis Intrusion Switch Removal
1 Fan power cable
2 Fan
3 Plastic locking tabs (2)
CAUTION: Before you remove the computer cover, see " Precautionary Measures ."
1 Control panel
2 Thermal cable connector
3 Control panel cable
4 Screw
5 Speaker cable connector
6 Chassis intrusion switch cable connector
7 Chassis intrusion switch
8 Hard-disk drive cage door