Replacing The Cover Presence Switch - Lenovo ThinkStation E31 Hardware Maintenance Manual

12. Reinstall the heat sink and fan assembly with the fan duct as shown. See "Replacing the heat sink and
fan assembly" on page 140.
Figure 90. Reinstalling the heat sink and fan assembly with the fan duct
13. Reconnect all cables that were disconnected from the system board.
What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the replacement, go to "Completing the parts replacement" on page 165.

Replacing the cover presence switch

Attention:
Do not open your computer or attempt any repair before reading and understanding "Important Safety Information"
on page 1.
This section provides instructions on how to replace the cover presence switch (intrusion switch).
Note: The cover presence switch (intrusion switch) is available only in some models.
To replace the cover presence switch, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See "Opening the computer cover" on page 120.
3. Remove the front bezel. See "Removing and reinstalling the front bezel" on page 120.
4. Locate the cover presence switch. See "Locating major FRUs and CRUs" on page 79.
.
Chapter 11 Replacing FRUs (for machine types: 3688, 3690, 3691, 3693, and 3695)
151