Table 4-2. Unit Troubleshooting Procedures (Cont).

Table 4-2. Unit Troubleshooting Procedures (Cont). - TM-5-4220-227-14_118

Section V. UNIT MAINTENANCE PROCEDURES - TM-5-4220-227-14_120

TM-5-4220-227-14 MK12 Surface Supported Diving System (SSDS) (NSN 4220-01-097-5674) Manual
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TM 5-4220-227-14 Table 4-2. Unit Troubleshooting Procedures (Cont). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 10. CHAMBER LIGHTS FAIL TO ILLUMINATE. Step 1. Ensure that chamber lights are plugged into power strip. Plug in if unplugged. Step 2. Check fuses on the light power source. Replace blown fuses. Step 3. Listen for sound of fan on light source. a. If sound is heard, but there is no light, replace bulb. b. If no fan is heard, replace light source. c. If problem persists, notify Direct Support Maintenance. 11. DEPTH GAGE INDICATES FAULTY PRESSURE READINGS. Step 1. Check ALP-013, ALP-015 and ALP-016the depth gage isolator valves. These valves may be closed or malfunctioning. Operate from full closed to full open several times. If valve is still malfunctioning, notify Direct Support Maintenance. Step 2. Equalize pressure in the I/L and O/L. All I/L and O/L depth gages (AGA-020, AGA-021, AGA-017, AGA-018, AND AGA-019) should indicate the same pressure. Cross-check all the gage indications to locate the faulty gage. Replace the faulty gage. 4-20

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