TM 5-4220-227-14
Table 4-2. Unit Troubleshooting Procedures (Cont).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7.
TOTAL ELECTRICAL POWER FAILURE (Cont).
WARNING
The GFI circuit breaker trips only when there is an electrical problem in the system. As a result there is a
danger of serious injury or death. Immediately troubleshoot the electrical system to locate the problem,
then push the reset switch.
Step 2. Check GFI. The GFI is the main circuit breaker for the recompression chamber. Total
power failure results when it is tripped
Disconnect the chamber console overhead fluorescent light and the GFI exten-
sion power strip. Push GFI RESET switch and observe GFI indicator light to
ensure that the GFI is receiving electrical power from the external power source.
To ensure the proper operation of the GFI, push the TEST switch. This should
trip the GFI circuit breaker. Set the RESET switch to up position again before
going on to next step.
Step 3. Reconnect chamber console fluorescent light to the GFI. The fluorescent light circuit may
be shorted out. If the fluorescent tube illuminates, go on to next step. If it does not check
GFI circuit breaker. The GFI circuit breaker may have tripped by the act of plugging in
the fluorescent light receptacle plug.
If this is the case, notify Direct Support Maintenance.
Step 4. Disconnect all circuits connected to the GFI power strip and reconnect the power strip to the
GFI. Move the rocker switch on the power strip to ON position. Observe that indicator light
in rocker switch glows. This shows that the circuit is energized. If indicator light glows,
proceed to next step. If indicator light does not glow, the GFI circuit breaker may have
tripped, indicating that the fault lies in the power strip, wiring, or receptacle plug.
In that case, notify Direct Support Maintenance.
Step 5. After ensuring that the power strip circuit breaker has not tripped, reconnect each of the five
circuits that were disconnected from the GFI power strip in step 4. While reconnecting each
circuit, observe which circuit trips the GFI circuit breaker. This will isolate the faulty circuit.
Troubleshoot the circuit(s) which caused the power strip reset switch to trip or the
GFI circuit breaker to trip.
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