Table of Contents
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Maintenance
How to Remove the Main Board
1.
Unplug the two cables from the input of the two attenuators.
2.
Carefully unplug the Main board assembly. Do not bend its pins.
3.
Unplug the connector that connects the Main board to the Front-Panel boards.
4.
Use a Torx T-9 screwdriver to remove the six screws and nut blocks that secure the Main board to the top
and bottom frames. Figure 3-4 shows the nut blocks.
5.
Use a Torx T-7 screwdriver to remove the four screws that fasten the heat sink to the to and bottom frames.
Figure 3-4 shows these screws.
6.
Use a Torx T-15 screwdriver to remove the four screws that fasten the plastic rear panel to the top and
bottom frames.
7.
Carefully withdraw the Main board from between the frames.
•
L_
i
f
HEAT SINK
t
RETAINING SCREWS (2)
NUT BLOCKS (3) - - - - - - - - - - - - - - - '
Figure 3-4. Nut blocks and Heat Sink Retaining Screws.
7391-307
3-12
l 1A52 Extended Service Manual
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Table of Contents
Troubleshooting
