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APPENDIX B: SYSTEM PREVENTATIVE MAINTENANCE
1. Make sure all connectors are dry tight and clean.
A pencil eraser and a can of compressed air can be used to brighten contacts and remove dust and
debris.
2. Aggressively shake each ICU to see if its mounting screws or internal hardware has worked loose.
Tighten any screws that show signs of movement.
3. Inspect all the cable runs for abrasion, stretching, and other kinds of damage. Replace any that show
signs of damage or excessive wear and might fail.
4. Inspect the power connection to the vehicle's DC distribution system.
Insure that the terminals are clean and have a solid connection.
Good clean DC power is essential for proper operation.
5. Test each crew station interface.
Set the Radio Selector Switch to the Two-Way Radio #1.
With a known good crew headset do the following:
Test the Intercom P-T-T button; you should be able to hear your own side tone.
Vary the volume control from minimum to maximum, to insure that the volume control works.
6. Do your radio checks and adjust the levels slowly and carefully.
The trimmer pots have an adjustment range of about 270 degrees.
Use only small precision tools designed for this task.
Using too much force can break these parts, requiring a return to the factory for repair.
7. Test the Radio P-T-T Button
Ask for a radio check of the Two-Way Radio.
The goal is to transmit and receive well on the Two-Way Radio #1.
8. Set the Radio Selector Switch to the Two-Way Radio #2.
Ask for a radio check of the Two-Way Radio.
The goal is to transmit and receive well on the Two-Way Radio #2.
9. Should any of these field checks fail, follow your procedures for changing out the failed item and
have it submitted for higher level repair by returning it to manufacturer.
Before each use please check the following:
FOR TECHNICAL ASSISTANCE
CALL +1-703-481-0068x23 or techsupport@c-at.com
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