Texas Instruments EXTENSA 570CD - Manual (Page 71)

2. Some versions of the IR/sound board contain two cables that connect
to the left side of the main board. Disconnect these cables, if present.
3. Remove three screws that hold the IR/sound board to the unit (two
screws are located at the rear which secure a rear bezel and one
screw is in the front).
4. Grasp the front left corner and front right corner of the board; remove
the board from the unit.
5. Replacement of the IR/sound board assembly is essentially the
reverse of Steps 1 through 4 above.
Note: Ensure that the I/O port address switch settings on the original board
match the setting of the replacement board (refer to Figure 5-3 in Section 5).
6.5.11
Removing/Replacing the Power Supply Board
To remove and replace the Power Supply Board, perform the following
procedure:
1. Remove the Top Case Assembly as described in Paragraph 6.5.8
2. Remove the holding screw on the left side of the board.
3. Firmly grasp the board and use a side-to-side rocking motion while
lifting up on the board.
4. When reinstalling the Power Supply Board, ensure that the plastic
cap that rests on top of the Closed Cover Switch has the slanted
surface facing the front of the Notebook.
6.5.12
Removing/Replacing the CMOS Battery
To remove and replace the CMOS battery, use the following procedure.
n
Note: Replacement of the CMOS battery will result in the loss of customer-
definable settings. Replace CMOS battery only if the battery is defective.
1. Remove the top case assembly as described in Paragraph 6.5.8.
2. Disconnect the battery cable from the main board; lift the battery
from the base.
3. Reinstall replacement battery.
6.5.13 Removing/Replacing the Main Board
To remove and replace the main board assembly, perform the following
procedure:
1. Remove the top case assembly as described in Paragraph 6.5.8.
2. Using a 5 mm hexdriver, remove the four hex standoffs (shortest is
located next to the PS/2 connector and the longest is located at the
rear of the unit).
3. Remove the four Phillips head screws securing the main board to the
base plastics.
Field Service 6-13