1170 System Board Assembly - Lenovo 019923U Hardware Maintenance Manual

For ThinkPad Edge 14" and E40:
Step Screw (quantity)
1
M2 × 2 mm, wafer-head, nylon-coated (1)
2
M2 × 3 mm, wafer-head, nylon-coated (2)
3
M2 × 5 mm, wafer-head, nylon-coated (4)

1170 System board 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, to make sure that the hard disk
drive Active Protection System
Note: If the test shows that hard disk drive Active Protection System is not functioning, be sure to
document the drop in any reject report, and replace the system board.
• 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
conductive corrugated material.
After replacing the system board, run PC-Doctor for DOS to make sure that hard disk drive Active Protection
System still functions. The procedure is as follows:
84
Hardware Maintenance Manual
TM
still functions (see below).
Torque
Color
Silver 0.181 Nm
(1.85 kgf-cm)
Black 0.181 Nm
(1.85 kgfcm)
Black 0.181 Nm
(1.85 kgfcm)