Cover Presence Switch (Intrusion Switch); Primary Hard Disk Drive - Lenovo ThinkCentre M90a Gen 3 Hardware Maintenance Manual

Cover presence switch (intrusion switch)

Prerequisite
Before you start, read Chapter 1 "Important safety information" on page 1 and print the following
instructions.
For access, do the following:
1. Remove the following parts in order, if any:
• "Computer stand" on page 52.
• "Rear I/O cover" on page 56.
• "System board shield" on page 57.
• "VESA mount bracket" on page 58.
2. Disconnect the cover presence switch cable (intrusion switch cable) from the system board.
Removal procedure

Primary hard disk drive

Prerequisite
Before you start, read Generic Safety and Compliance Notices, and print the following instructions.
Attention: The internal storage drive is sensitive. Inappropriate handling might cause damage and
permanent loss of data. When handling the internal storage drive, observe the following guidelines:
• Replace the internal storage drive only for upgrade or repair. The internal storage drive is not designed for
frequent changes or replacement.
• Before replacing the internal storage drive, make a backup copy of all the data that you want to keep.
• Do not touch the contact edge of the internal storage drive. Otherwise, the internal storage drive might get
damaged.
• Do not apply pressure to the internal storage drive.
.
Chapter 6 Hardware removal and installation
59