TM 9-2320-362-14&P
4-6. DIRECT SUPPORT TROUBLESHOOTING
Table 4-1.
Direct Support Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
INCANDESCENT LAMP IS NOT LIT ON POWER INTERFACE BOX WHEN
CIRCUIT BREAKER IS ON.
NOTE
When measuring +28 VDC, use ± 2 VDC for tolerance,
WARNING
Serious injury could result if safety pre-
cautions are not followed when troubleshooting
this equipment.
Step 1.
Turn off circuit breaker on power interface box.
Step 2.
Remove lens and incandescent lamp from power interface
box .
Step 3.
Turn on circuit breaker.
Step 4.
Measure voltage at lamp socket.
If multimeter does not read about +28 VDC, proceed to
step 5.
If multimeter reads about +28 VDC, turn off circuit
breaker and replace incandescent lamp and lens
(para. 3-31).
Step 5.
Measure voltage at terminal 11E4.
If multimeter does not read about +28 VDC, proceed to
step 6.
If multimeter reads about +28 VDC, proceed to step 7.
Step 6.
Open battery compartment (TM 9-2320-280-20). Measure
voltage at power stud.
If multimeter does not read about +28 VDC, test
batteries (TM 9-2320-280-20).
If multimeter reads about +28 VDC, turn off circuit
breaker and replace power cables (para. 4-19).
Step 7,
Remove power interface box cover.
Measure voltage at load side of circuit breaker.
If multimeter does not read about +28 VDC, replace
circuit breaker (para. 4-8).
If multimeter reads about +28 VDC, replace indicator
light and wire assemblies (para. 4-9).
4-2
