Dell OptiPlex NX1 - Manual (Page 80)

4-10 Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual
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To remove a 5.25-inch drive assembly, follow these steps:
1. Remove the 3.5-inch diskette drive assembly.
2. Disconnect the DC power cable and the interface cable from the back of
the 5.25-inch drive.
3. Lift the 5.25-inch drive assembly straight up and out of the chassis.
4. Lay the 5.25-inch drive assembly upside down; then remove the four
screws attaching the drive to the bracket.
When you replace the 5.25-inch drive, place the front of the drive toward the
front of the bracket; then install the four screws, but do not tighten them. Align
the screws with the score marks on the bracket, and tighten the screws in the
order stamped on the bottom of the bracket.
Check the alignment of the computer cover around the 5.25-inch drive bezel.
Adjust the drive forward or backward on the bracket to align it.
drive-mounting
screws (4)
front of computer