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TM5-4120-387-14
a.
Access
(1) Using screwdriver, loosen four captive panel fastener screws in
junction box cover.
Tag and disconnect wire leads.
(2) Remove junction box cover.
b.
Removal
(1) Tag and disconnect wire leads.
(2) Using wrench, remove four nuts and lock washers from transformer
mounting studs.
(3) Remove transformer and gasket.
c.
Test
(1) Connect the probes of a continuity tester or 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 continuity tester or a multimeter set on the
lowest OHMS scale to terminal studs Xl 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 and 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 Xl and 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 Xl and X2. If
resistance is less than 500,000 ohms, replace the transformer.
d.
Installation
(1) Position transformer and gasket on outside rear of junction box.
(2) Using wrench, secure transformer with four nuts and lock washers.
(3) See tags and wiring diagram (fig. 4-7) and connect leads. Remove tags.
(4) Using screwdriver, install junction box cover and tighten captive panel
fastener screws.
4-75
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