Technical data

4-25
Replacing Instrument Assemblies
To Remove the A4 PC Motherboard
To Remove the A4 PC Motherboard
NOTE The 86100A is used in the following steps. Although some of the components are different
in the 86100B, the removal procedure is virtually identical.
1 Follow the instructions on page 4-4 for removing the mainframe cover.
2 Use a T-10 TORX driver to remove the four screws that secure the fan, as shown in Figure 4-34,
then lift the fan out of the mainframe.
Figure 4-34. Removing the Fan
3 Use a T-10 TORX driver to remove the two screws that secure the bar to the mainframe, as shown
in Figure 4-35.
Figure 4-35. Removing the Bar (86100A only)