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TM 11-5820-890-30-5
5-18. DISASSEMBLY FOR TROUBLESHOOTING.
The power amplifier must be disassembled to gain access to the test points. Figures 5-5, 5-6, and 5-7 identify
the test points inside the power amplifier.
Tools:
Flat tip screwdriver
ITEM
ACTION
REMARKS
High voltage (200 V) and high RF energy (50 watts) are present in the power amplifier during
testing. Do not disassemble with power applied to the power amplifier.
a. Power amplifier
Set on work surface with heat sink side
down. See figure 5-11.
b. Cover (10)
Using flat tip screwdriver, fully loosen 12
captive screws and remove cover.
c. Power amplifier
Set on work surface with heat sink
side up.
d. Power amplifier
Using flat tip screwdriver, fully loosen 12
captive screws that secure power amplifier
heat sink (1) to power amplifier case (4).
e. Power amplifier
Separate power amplifier heat sink from
power amplifier case but do not disconnect
any cables. Set on work surface with
access to desired test points.
f. Seal screw (5)
Using flat tip screwdriver, remove and
inspect. If seal screw is bad, replace it.
Thread and tighten.
5-33
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