Table 4-22. Twelve Inch Signalling Searchlight Troubleshooting.

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Table 4-21. Hot Water Heater 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 4-22. Twelve Inch Signalling Searchlight Troubleshooting (Continued).

TM 55-1905-219-14-8

4-5. GENERAL (Continued).

Table 4-22. Twelve Inch Signalling Searchlight Troubleshooting.

NOTE

Refer to paragraph 4-77 for maintenance instructions.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

No light.

Step 1. Loss of power.

Check fuses.

Check circuit continuity.

Step 2. Burned out lamp.

Replace lamp.

Weak beam.

Step 1. Improper lamp.

Install lamp rated for supply voltage.

Step 2. Lamp blackened with age.

Replace.

Step 3. Dirty optical system.

Clean coverglass and reflector.

Step 4. Shutter blades not properly opened.

Adjust shutter stops.

Replace worn stop screw.

Step 5. Low voltage.

Check control panel.

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