Table 4-19. Fire Detection and Extinguisher System Troubleshooting.

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Table 4-18. Washer/Dryer Troubleshooting (Continued).

TM-55-1905-219-14-8 Landing Craft Utility (LCU) 1667 Class Boston Hull Numbers 1667-1670 NSN 1905-00-168-5764 Manual

Table 4-20. Public Address Set, AN/PIC-2 Troubleshooting.

TM 55-1905-219-14-8

4-5. GENERAL (Continued).

Table 4-19. Fire Detection and Extinguisher System Troubleshooting.

NOTE

Refer to paragraph 4-45 for maintenance instructions.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

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.

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.

4-77