Lenovo ThinkPad Edge E420s Hardware Maintenance Manual - Page 82

System board assembly and fan assembly, Screw quantity, Color, Torque

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1 Step 2 Screw (quantity) M2 × 4 mm, wafer-head, nylon-coated (1) 2 Color Black Torque 0.181 Nm (1.85 kgfcm) 1160 System board assembly and fan assembly Important notices for handling the system board: When handling the system board, bear the following in mind. • The system board has an accelerometer, which can be broken by applying several thousands of G-forces. Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench can subject the accelerometer to as much as 6,000 G's of shock. • Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite. • If a system board is dropped, you must test it, using PC-Doctor for DOS if the system supports PC-Doctor for DOS, to make sure that the HDD Active Protection System™ still functions. Note: If the test shows that the HDD Active Protection System is not functioning, be sure to document the drop in any reject report, and replace the system board. 76 Hardware Maintenance Manual

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1
Step
Screw (quantity)
Color
Torque
2
M2 × 4 mm, wafer-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
2
1160 System board assembly and fan assembly
Important notices for handling the system board:
When handling the system board, bear the following in mind.
•
The system board has an accelerometer, which can be broken by applying several thousands of G-forces.
Note:
Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench can subject
the accelerometer to as much as 6,000 G's of shock.
•
Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.
•
If a system board is dropped, you must test it, using PC-Doctor for DOS if the system supports PC-Doctor for
DOS, to make sure that the HDD Active Protection System
™
still functions.
Note:
If the test shows that the HDD Active Protection System is not functioning, be sure to document the drop
in any reject report, and replace the system board.
76
Hardware Maintenance Manual