Toshiba T4900CT Manual page 158

4.15 Lower System Board
Removing the Lower System Board
To remove the T4900CT's lower system board, follow the steps below and refer to figures 4-
36 through 4-38.
1. Turn off the power to the T4900CT and disconnect the AC adapter, power cord,
and all external cables connected to the T4900CT.
2. Remove the battery pack, optional memory card, optional PCMCIA card, HDD
pack, top cover, keyboard, status indicator panel, backup battery and microphone,
display assembly, upper system board, power supply board, base assembly, and
PCMCIA slot 2 board as described in sections 4.2 through 4.12, and 4.14.
3. Disconnect the FDD cable from PJ304 of the lower system board, if not discon-
nected earlier.
4. Remove three M2.5x6 screws securing the lower system board's metal cover,
then lift it off (figure 4-36). Be careful to clear two audio ports projecting slightly
through holes in the cover.
Figure 4-36 Removing the lower system board's metal cover
T4900CT
4-39