Table 4-26. Twelve Inch Signaling Searchlight Troubleshooting.

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Table 4-25. Hot Water Heater Troubleshooting - continued

TM-55-1905-220-14-8 Landing Craft Utility LCU 1671-1679 NSN 1905-01-009-1056 Manual

PUMP SETS.

TM 55-1905-220-14-8

4-5. GENERAL (Continued).

Table 4-26. Twelve Inch Signaling Searchlight Troubleshooting.

NOTE

Refer to paragraph 4-79 for maintenance instructions.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. No light.

Step 1. Loss of power.

Check fuses.

Check circuit continuity.

Step 2. Burned out lamp.

Replace lamp.

2. 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.

3. Shutter leaks light.

Not fully closed.

Adjust shutter stops.

Replace broken shutter spring.

4-85