TM 9-4120-403-14
Inspection
(1)
Loosen four captive panel fastener screws and remove junction box cover.
(2)
Inspect transformer for overheating or obvious damage.
(3)
Inspect terminal connections for tightness or damaged wires.
Removal
(1)
Tag and disconnect wire leads.
(2)
Remove four nuts and lockwashers from transformer mounting studs.
(3)
Remove transformer and gasket.
Test
(1) Connect the probes of a multimeter set on the lowest OHMS scale to terminal studs H1 and H2. If the
primary winding is open, replace the transformer.
(2) Connect the probes of a multimeter set on the lowest OHMS scale to terminal studs X1 and X2. If the
secondary winding is open, replace the transformer.
(3) Connect one probe of a multimeter set on high OHMS scale to either terminal stud H1 or H2 and the other
probe to the transformer case. If resistance is less than 500,000 ohms, replace the transformer.
(4) Connect one probe of a multimeter set on high OHMS scale to either terminal stud X1 or X2 and the other
probe to the transformer case. If resistance is less than 500,000 ohms, replace the transformer.
(5) Connect one probe of a multimeter set on high OHMS scale to either terminal stud H1 or H2 and the other
probe to either terminal stud X1 or X2. If resistance is less than 500,000 ohms, replace the transformer.
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