Lenovo ThinkPad Edge E50 Hardware Maintenance Manual - Page 91

System board assembly, Important notices for handling the system board, Diagnostics

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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) Silver Black Black 0.181 Nm (1.85 kgfcm) 0.181 Nm (1.85 kgfcm) 0.181 Nm (1.85 kgfcm) 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 SystemTM still functions (see below). 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 58 • "1020 Optical drive or travel cover" on page 58 • "1030 Thermal cover" on page 59 • "1040 Hard disk drive (HDD) assembly" on page 60 • "1050 DIMM" on page 61 • "1060 Fan assembly" on page 63 • "1070 CPU" on page 66 • "1080 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN" on page 67 • "1090 Palm rest assembly with cables" on page 69 • "1100 PCI Express Mini Card for wireless LAN" on page 72 • "1110 Backup battery" on page 74 • "1120 Bluetooth daughter card (BDC-2)" on page 75 • "1130 Keyboard" on page 75 • "1140 Keyboard bezel" on page 78 Chapter 8. Removing or replacing a FRU 85

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Table 26. Removal steps of top shielding assembly (continued)
1
M2 × 2 mm, wafer-head, nylon-coated (1)
Silver
0.181 Nm
(1.85 kgfcm)
2
M2 × 3 mm, wafer-head, nylon-coated (2)
Black
0.181 Nm
(1.85 kgfcm)
3
M2 × 5 mm, wafer-head, nylon-coated (4)
Black
0.181 Nm
(1.85 kgfcm)
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
TM
still functions (see below).
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 58
•
“1020 Optical drive or travel cover” on page 58
•
“1030 Thermal cover” on page 59
•
“1040 Hard disk drive (HDD) assembly” on page 60
•
“1050 DIMM” on page 61
•
“1060 Fan assembly” on page 63
•
“1070 CPU” on page 66
•
“1080 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN” on page 67
•
“1090 Palm rest assembly with cables” on page 69
•
“1100 PCI Express Mini Card for wireless LAN” on page 72
•
“1110 Backup battery” on page 74
•
“1120
Bluetooth
daughter card (BDC-2)” on page 75
•
“1130 Keyboard” on page 75
•
“1140 Keyboard bezel” on page 78
Chapter 8
.
Removing or replacing a FRU
85