Lenovo ThinkPad X121e Hardware Maintenance Manual page 71

• Avoid rough handling of any kind.
• At every point in the process, be sure not to drop or stack the system board.
• If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a corrugated
conductive surface.
After replacing the system board, run PC-Doctor for DOS to make sure that the HDD Active Protection System
still functions. The procedure is as follows:
1. Place the computer on a horizontal surface.
2. Run Diagnostics ➙ ThinkPad Devices ➙ HDD Active Protection Test.
Attention: Do not apply physical shock to the computer while the test is running.
For access, remove these FRUs in order:
• "1010 Battery pack" on page 50
• "1020 Bottom slot cover" on page 51
• "1040 Hard disk drive or solid state drive assembly" on page 52
• "1070 Keyboard" on page 57
• "1090 Top case assembly" on page 60
• "1100 Bluetooth daughter card" on page 62
Removal steps of system board
Step Screw (quantity)
1
M2 × 3 mm, wafer-head, nylon-coated (2)
When installing: Make sure that the connector is attached firmly to the system board.
1
1
3
4
5
6
Color
Black
.
Chapter 8 Removing and replacing a FRU
Torque
0.181 Nm
(1.85 kgfcm)
65