Dell OptiPlex NX1 Service Manual - Page 81

Check the alignment of the computer cover around the 5.25-inch drive bezel.

Page 81 highlights

drive-mounting screws (4) front of computer To remove a 5.25-inch drive assembly, follow these steps: 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. Removing and Replacing Parts on the Low-Profile Chassis 4-9

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Removing and Replacing Parts on the Low-Profile Chassis
4-9
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To remove a 5.25-inch drive assembly, follow these steps:
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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