Lenovo ThinkPad X220 Hardware Maintenance Manual page 90

• 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 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.
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 62
• "1020 Hard disk drive (HDD) and solid state drive (SSD)" on page 63
• "1030 DIMM" on page 65
• "1040 Keyboard" on page 67
• "1050 Palm rest or palm rest with a fingerprint reader" on page 69
• "1060 PCI Express Mini Card for wireless LAN/WiMAX" on page 71
• "1070 Backup battery" on page 73
• "1080 PCI Express Mini Card for wireless WAN" on page 74
• "1090 Keyboard bezel" on page 75
• "1100 LCD assembly" on page 77
• "1110 Base cover assembly and speaker assembly" on page 80
Removal steps of system board, DC-in connector, fan, and ExpressCard slot assembly
The following components soldered on the system board are extremely sensitive. When you service the
system board, avoid any kind of rough handling.
a
b
c
84
Hardware Maintenance Manual
Platform Controller Hub (PCH)
CPU
Accelerometer chip for the HDD Active Protection
System