TM 5-4220-225-14
Table 4-1. Unit Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. LOSS OF COMMUNICATION, ALL DIVERS.
Step 1. Check power connection.
Repair defective connection.
Step 2. Check external power supply.
Replace external power supply.
Step 3. Check for defective communication box.
Repair or replace defective box.
2. LOSS OF COMMUNICATION, ONE DIVER.
Step 1. Check diver cable on alternative connection.
Replace defective box (para. 4-32).
Step 2. Inspect umbilical.
Replace a defective umbilical (para. 4-31).
Step 3. Check connections.
Clean, flush, dry and lubricate.
Step 4. Perform continuity check of helmet wiring.
Repair or replace helmet communications (para. 4-26).
3. LOSS OF COMMUNICATION BETWEEN DIVERS.
Step 1. Connect either diver to unused diver connection, retest.
If communication is restored, replace communication box (para. 4-32).
Step 2. Connect other diver to other divers original connection, retest.
If communication is restored, replace defective communication box
(para. 4-32).
4-4
