Texas Instruments Extensa 450 Series, Maintenance Manual

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2 . Remove the Top Case Assembly as described in Paragraph 6.5.10.
3 . Using a plastic stick, lift up on the left and right edges of the board. The board
assembly snaps out. Lift the board out of the unit.
4 . Reassembly is the reverse of steps 1 through 3 above.
6.5.16
Removing/Replacing the Main Board
To remove and replace the Main Board Assembly, perform the following procedure:
1 . Remove the AC Adapter, Battery Pack, Hard Disk Drive and Floppy Disk Drive
from the unit.
2 . Remove the keyboard assembly as described in Paragraph 6.5.5
3 . Remove the Heatsink as described in paragraph 6.5.6.
4 . Remove the Power Supply Board as described in paragraph 6.5.14.
5 . Remove the Memory Board as described in paragraph 6.5.15.
6 Disconnect all interboard cable connectors (SIR Board Connector from J9;
Primary Battery Board Connector from J15, etc.
7 Using a small flat blade screwdriver and apply light pressure in a rocking
motion to remove the hard drive cable connector.
8 Remove the three large Phillips-head screws (one near the 25-pin parallel port and
two screws near the floppy connector.
Do not remove the smaller
Figure 6-9 Memory Board Removal
6-16 Field Service