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TM 9-4120-389-14
a. Inspection
(1) Check for loose, missing or frayed insulation on leads. Solder or replace as needed.
(2) Check for burnt or damaged transformer. Replaced transformer if burnt or damaged.
b. Test
(1) Tag and remove transformer leads.
(2) Using a multimeter set on lowest OHMS scale probe terminal X1 to H1.
(3) If resistance is less than infinity (no continuity) the transformer is shorted. Replace transformer.
(4) Using a multimeter set on lowest OHMS scale, probe terminal H1 to H2. 5.
(5) Resistance reading should be 0.5 OHMS + 0.2. Replace transformer if criteria is not met.
(6) Using a multimeter set on lowest OHMS scale, probe terminal X1 to X2.
(7) Resistance reading should be 9 OHMS + 3 OHMS. Replace transformer if criteria is not met.
c. Removal
(1) Tag and disconnect the wires.
(2) Remove four screws, flat washers and selflocking nuts from transformer. Remove transformer.
d. Installation
(1) Align four holes in transformer to mounting hardware in housing.
(2) Using screwdriver, secure transformer to housing with four screws, four flat washers and four
selflocking nuts.
(3) See tags, electrical wiring diagram (FO-1) and electrical wiring instructions (para. 4-36) and
connect leads to transformer. Remove tags.
Follow-on procedure: Install junction box (See para. 4-46).
4-155
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