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TM 11-5820-890-30-5
Section IV. MAINTENANCE PROCEDURES
Subject
Para
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
Disassembly for Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
Replacement of Power Amplifier Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19
Replacement of Decoder Control (6A2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
Replacement of Power Amplifier Heat Sink (6A3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
Replacement of Power Amplifier Case (6A1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22
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5-35
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5-15. GENERAL.
This section includes the operational check and the repair procedures. The operational check is used to verify
the operation of a repaired power amplifier. lt is also used to verify the symptom of a faulty power amplifier. It will
identify the troubleshooting chart to be used. When a bad module is identified, replace it using the procedure in
this section.
5-16. OPERATIONAL CHECK.
Perform the operational check found in paragraph 5-10 to verify the proper operation of the power amplifier.
5-17. REPAIR INSTRUCTIONS.
Repair of the power amplifier consists of replacing a bad module. A module is replaced by removing it and
installing a good one. Procedures for doing this follow:
a.
b.
5-32
General Instructions.
The following instructions apply to all repair tasks.
1.
Remove all cables connected to the power amplifier.
2.
Inspect the power amplifier for damage, Repair any obvious physical damage.
3.
Handle all modules carefully.
4.
Before installing a module, check the connectors or terminals for bent or broken pins.
Do not install if damaged.
5.
After the repair, perform the operational check.
Repair Precautions.
CAUTION
Static electricity and stray voltages can damage the decoder control (6A2). Ground the power
amplifier and all tools before removing the decoder control. Use a grounded wrist strap when
handling the decoder control.
CAUTION
Steps marked with must be performed exactly as written. They are critical in maintaining
the nuclear hardness of the power amplifier. Seals must not be damaged. All screws must be
torqued to the limits specified in the replacement procedures.
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