Lenovo ThinkPad L520 Hardware Maintenance Manual - Page 98
System board assembly, Screw quantity, Color, Torque
View all Lenovo ThinkPad L520 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 98 highlights
11 2 2 2 3 Step 1 2 Screw (quantity) M2 × 3 mm, flat-head, nylon-coated (2) M2 × 5 mm, flat-head, nylon-coated (3) Color Black Black Torque 0.181 Nm (1.85 kgfcm) 0.181 Nm (1.85 kgfcm) 2020 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 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. • 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. If the system supports PC-Doctor for DOS, 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 59 92 Hardware Maintenance Manual