I/O Brackets (M90A) - Lenovo ThinkCentre M70a Hardware Maintenance Manual

12. Connect the new internal speaker cable to the system board.
13. Reinstall the removed parts.
14. Place the computer in an upright position.
15. If a locking device is available, use it to lock the computer.
16. Reconnect the external cables and power cords to the corresponding connectors on the computer.

I/O brackets (M90a)

Prerequisite
Before you start, read Chapter 1 "Important safety information" on page 1 and print the following
instructions.
Replacement procedure of the left I/O bracket
1. Remove the computer stand. See "Computer stand" on page 61.
2. Remove the rear cover. See "Rear cover" on page 65.
3. Remove the optical drive. See "Optical drive" on page 66.
4. Remove the optical drive holder. See "Optical drive holder" on page 69.
5. Remove the system board shield. See "System board shield" on page 71.
6. Remove the VESA mount bracket cover. See "VESA mount bracket cover" on page 74.
7. Remove the VESA mount bracket. See "VESA mount bracket" on page 76.
8. Remove the serial connector module. See "Serial connector module" on page 100.
9. Remove the cable cover. See "Cable cover" on page 102.
10. Remove the internal speakers. See "Internal speakers" on page 122.
11. Replace the left I/O bracket.
Figure 135. Removing the left I/O bracket
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M70a and M90a Hardware Maintenance Manual