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TM5-4120-376-14
4-24. HEATER, TRANSFORMER, RECTIFIER AND RELATED PARTS/Inspect, Test, Replace
(Cont)
LOCATION/ITEM
Inspection:
Rectifier/Transformer/Capacitor (C1)(C2)
1. Inspect for damage, cracks, scorches and/or missing.
2. Replace if damaged.
Test:
Rectifier
1.
2.
3.
4.
5.
6.
Apply external 28-30 VAC to rectifier terminal 1 and 3.
Output at terminal 4 and 2 should be 26-30 VDC.
Terminal 4 is negative.
Terminal 2 is positive.
If above requirements are not met, rectifier is defective.
Replace defective rectifier.
Transformer
1. Check for continuity across the primary winding and then across the secondary winding. If
either winding is open, replace the transformer.
2. Check for shorts between one terminal and transformer case and also between one
primary terminal and one secondary terminal using multimeter on high ohms setting. Replace
transformer if a short is indicated.
Capacitors (C-1) and (C-2)
1. Unsolder leads on capacitor and tag wires.
2. Apply exernal 28 VAC to the capacitor to charge the capacitor.
3. Using a multimeter or other continuity testing device, check for continuity on the
capacitor.
4. No continuity indicates a defective capacitor. Complete continuity indicates a defective
capacitor. A short spike returning to 0 indicates a good capacitor.
4-148
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