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 TM 55-1905-220-14-8
4-5. GENERAL (Continued).
Table 4-23. Fire Detection and Extinguisher System Troubleshooting.
NOTE
Refer to paragraph 4-46 for maintenance instructions.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Failure of all detectors to respond to test.
Lack of power or faulty wiring.
Check continuity of electrical wiring and all connections. Check for 28 volts direct current (VDC)
at various points to insure proper line voltage. Repair or replace wiring and/or connections as
required. Perform test procedure again, noting results.
2. Failure of all detectors in one compartment to respond to test.
Step 1. Lamp failure.
Check wiring and connections of appropriate lamp on Control Panel. Insert new lamp and test. If
lamp still fails to light...
Step 2. Faulty wiring.
Check continuity of wiring between compartment detectors and the control amplifier.
If wiring is faulty, repair or replace and perform test again. If wiring is not at fault...
Step 3. Defective control amp.
With test switch in TEST 1 position, check signal input pins of control amplifier mating connector
MS24266R-12B-12SN, using a vaccum tube volt meter (VTVM) for a minimum signal voltage of
14 VDC 1. Test signal input for all detectors in compartment.
If signal is present, the control amplifier is defective. Replace with a new control amplifier.
4-80
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