1170 System Board Assembly - Lenovo 0319A25 Hardware Maintenance Manual

Table 26. Removal steps of top shielding assembly (continued)
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 HDD
Active Protection System
Note: If the test shows that 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
conductive corrugated material.
After replacing the system board, run PC-Doctor for DOS to make sure that 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 54
• "1020 Optical drive or travel cover" on page 54
• "1030 Thermal cover" on page 55
• "1040 Hard disk drive (HDD) assembly" on page 56
• "1050 DIMM" on page 57
• "1060 Fan assembly" on page 58
• "1070 CPU" on page 61
• "1080 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN" on page 62
• "1090 Palm rest assembly with cables" on page 65
• "1100 PCI Express Mini Card for wireless LAN" on page 68
• "1110 Backup battery" on page 69
• "1120 Bluetooth daughter card (BDC-2)" on page 70
• "1130 Keyboard" on page 71
• "1140 Keyboard bezel" on page 74
TM
still functions (see below).
0.181 Nm
Silver
(1.85 kgfcm)
Black 0.181 Nm
(1.85 kgfcm)
Black 0.181 Nm
(1.85 kgfcm)
.
Chapter 8 Removing and replacing a FRU
81