Important notices for handling the system board:
When handling the system board, bear the following in mind.
- At every point in the process, be sure not to drop or stack the system board.
- 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 still functions (see below).
Note: If the test shows that HDD Active Protection is not functioning, be sure to document the drop in any reject report, and replace the system board.
- Avoid rough handling of any kind.
- 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 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:
- Serial Ultrabay Enhanced device.
- Hard disk drive cover, hard disk drive, and hard disk rubber rails
- Palm rest or palm rest with fingerprint reader.
- PCI Express Mini Card for wireless LAN
- Keyboard bezel and speakers
- Fan assembly.
- LCD assembly.
- Base cover and PC Card/ExpressCard (or ExpressCard/Smart Card) bezel assembly.
- Structure frame and IEEE 1394 sub card
Following components soldered on the top side of the system board are extremely sensitive. When you service the system board, avoid any kind of rough handling.
(b) Video chip (Discrete graphics chip models only.)
(c) MCH (Memory Controller Hub)
(d) ICH (I/O Controller Hub)
(e) Accelerometer chip for the HDD Active Protection System ™
|1||M2 × 2.7 mm, flat-head, nylon-coated (2)||Black||0.167 Nm(1.7 kgfcm)|
Turn the system board over, and then disconnect the PC Card/ExpressCard slots (or ExpressCard/Smart Card slots) assembly (a) from the system board.
When installing: Make sure that the connector of the PC Card/Express Card slots (ExpressCard/Smart Card slots) assembly is attached to the system board firmly.