TM 11-5841-283-12/NAVAIR 16-30APR39-1
TROUBLESHOOTING.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. No indicator strobe appears on radar signal indicator screen and no audio is present.
Step 1. Check that PWR-ON-OFF switch on control unit is set to ON.
If PWR-ON-off switch on control unit is off, set to ON.
Step 2. Check that 28 vdc circuit breaker is set to ON. See aircraft manual.
If 28 vdc circuit breaker is off, set to ON.
Step 3. Check for bad control unit. See troubleshooting flowcharts at back of manual.
If control unit is bad, replace unit with a new one. Turn bad unit in for
If comparator is bad, replace unit with a new one. Turn bad unit in for
Step 5. Check for bad indicator unit. See troubleshooting flowcharts at back of manual.
If indicator is bad, replace unit with a new one. Turn bad unit in for
2. No indicator strobe appears on radar signal indicator screen and only MA audio is present.
Check for bad radar signal indicator. See troubleshooting flowcharts at back of
manual.
If radar signal indicator is bad, replace unit with a new one. Turn
3. No indicator strobe appears on radar signal indicator screen, and all audio is present.
Check for bad radar signal indicator. See troubleshooting flowcharts at back of
manual.
If radar signal indicator is bad, replace unit with a new one. Turn in bad
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