TM 5-4220-225-14
Table 4-1. Unit Troubleshooting Procedures (Cont).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. ONE DIVER DOES NOT RECEIVE TOPSIDE.
Step 1. Move affected diver's communication cable to another connection.
If reception is restored, replace communication box (para. 4-32).
Step 2. Visually inspect earphone connection for corrosion, dirt, water, and tightness.
Clean and tighten earphone connections.
Step 3. Perform continuity checks of earphone and leads.
Repair or replace helmet communications (para. 4-26).
7. VACUUM TEST DOES NOT MEET REQUIREMENTS.
Step 1. Remove the air supply valve from the adapter and inspect for foreign matter.
Clean, reinstall and retest.
Step 2. Vacuum test another helmet.
If test is good, check for loose fittings and correct. Retest.
Step 3. Inspect for loose connections.
Tighten connection and retest.
Step 4. No reading on gage.
Replace gage on quick-disconnect fitting and retest.
Step 5. Replace faulty vacuum pump and retest.
If retest meets requirements, action is completed.
4-6
