TM 5-4220-225-14
Table 4-1. Unit Troubleshooting Procedures (Cont).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. WEAK OR INTERMITTENT SENDING AND RECEIVING, ONE DIVER.
Step 1. Move affected diver's communication cable to another connection on the communication
box.
If communication is restored, replace communication box (para. 4-31).
Step 2. Check preformed packing at whip connection.
Clean, flush, dry and lubricate.
Step 3. Visually inspect communication cable connectors and helmet connector for corrosion, water,
dirt, and poor solder connections.
Step 4. Perform continuity checks of communication cable, whip, and helmet wiring. Flex the wires
to expose possible intermittent connection.
Repair defective connection or replace defective cable, whip or helmet wiring
(para. 4-26, 4-27 and 4-31).
5. TOPSIDE DOES NOT RECEIVE ONE DIVER OR RECEPTION IS WEAK OR INTERMITTENT.
Step 1. Move affected diver's communication cable to another connection on the communication
box.
If reception is normal, replace communication box (para. 4-32).
Step 2. Visually inspect helmet communication for loose or dirty microphone connections.
Clean and tighten microphone connections.
Step 3. Perform continuity checks of microphone leads.
Repair or replace helmet communications (para. 4-26).
4-5
