Dell Precision WorkStation 420 Service Manual page 29

Drives
CAUTION: Before you remove the computer cover, see
NOTE: In all of the following procedures, left and right refer to your left and right as you face the front of the computer.
Figure 8. Drive Locations
Diskette Drive Removal
To remove the 3.5-inch diskette drive assembly, perform the following steps:
1. Disconnect the DC power/interface cables from the back of the diskette drive.
Note the routing of the DC power/interface cables through the chassis as you disconnect them. It is important to route the cables properly
when you replace them to prevent the cables from being pinched or crimped.
2. Press the retaining-tab release button (see
3. Remove the screw securing the diskette drive to the bracket (see
4. Rotate the left side of the diskette drive up until the drive is clear of the retaining tabs.
When you replace the 3.5-inch diskette drive on the bracket, be sure that the two retaining tabs on the right side of the bracket engage the
mounting holes in the side of the 3.5-inch diskette drive/bracket. Then replace the screw that holds the diskette drive to the bracket. To replace the
3.5-inch diskette drive assembly in the chassis, slide the bracket tabs into the guides on the chassis until the bracket snaps into place. Reconnect
the DC power/interface cables.
Figure 9. Diskette Drive Removal
"Precautionary
1 3.5-inch diskette drive
2 5.25-inch drive bays (3)
3 Hard-disk drive
Figure 9) and pull the diskette drive assembly forward to remove it from the chassis.
Figure 10).
1 Retaining-tab release button
Measures."