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Replacing the Top System Board
Perform the following steps when you replace the top
system board:
1. Before inserting the top system board, move the
power switch cover forward toward the front of the
base assembly. Make sure that the spring in the
power switch is fully inside the plastic housing.
2. Insert the top system board, tilting the board to the
left and aligning the appropriate connectors with the
slots on the base assembly. Be careful to align the
power switch cover with the switch mechanism on the
board.
3. Gently press the battery pack connector down to
place the connector in the slot on the base assembly.
4. Ensure that the inverter card is firmly attached to the
top system board, and that the infrared window is
attached to the inverter card. The infrared window
has a top and bottom. Install the window with the
long side with the partial cutout facing the top of the
inverter card.
5. Feed the speaker cable between the inverter card
and the top system board to the right of the inverter
card connector to the board.
6. As you press lightly down on the top system board
and the inverter card, slip the bottom corners of the
inverter card into the slots in the base assembly.
7. Gently but firmly press on the middle of the top
system board to finish inserting the board and to
ensure a complete connection between the
board-to-board connectors.
Removing and Replacing the SO-DIMM
Card
Warning: The SO-DIMM card is sensitive to physical
shock. Incorrect handling of the card can damage it.
To remove a SO-DIMM card, follow these steps:
1. Power-off the computer.
2. Remove the battery.
3. Disconnect all cables and other devices, including the
AC adapter.
4. Close the computer and turn it upside down.
5. Open the SO-DIMM door.
178 IBM Mobile Systems HMM