Lenovo 28473ZU Hardware Maintenance Manual - Page 99
System board assembly, Important notices for handling the system board, Diagnostics
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Step 1 2 Screw (quantity) M2 × 3 mm, wafer-head, nylon-coated (2) M2 × 5 mm, wafer-head, nylon-coated (4) Color Black Black Torque 0.181 Nm (1.85 kgfcm) 0.181 Nm (1.85 kgfcm) 1200 System board assembly • To identify the system board originally installed in your computer, go to PEW at the following web site: http://www.lenovo.com/support/site.wss/document.do?lndocid=LOOK-WARNTY Select Warranty Lookup. Input the machine type and the serial number. Use the system board listed on PEW. • Business Partners using Eclaim can access PEW at the following web site: https://wca.eclaim.com Select Entitlement Lookup. Input the Loc ID, the machine type, and the serial number. Use the system board listed on PEW. 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 if several thousands of G-forces are applied. 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 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 a 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. 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 61 • "1020 ExpressCard blank bezel and Media Card blank bezel" on page 63 • "1030 Optical drive or travel cover" on page 64 • "1040 Thermal cover" on page 65 • "1050 Hard disk drive (HDD) assembly" on page 66 • "1060 DIMM" on page 67 • "1070 Fan assembly" on page 68 • "1080 CPU" on page 71 Chapter 8. Removing and replacing a FRU 93