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Power Transistor HVAC: Testing and Inspection




Inspection Using a Diode Tester
1. Disconnect the power transistor connector.




2. Verify that the voltage between the terminals of the power transistor connector (mail) is as shown below.
3. If not as specified, replace the power transistor.




Inspection Using a Resistor
1. Remove the power transistor.
2. Verify that the battery voltage is 12 V.
3. Set the circuit by using the resistor (1 k-ohm, rated power: 0.25 W), the voltmeter, and battery as shown in the figure.
4. Verify that the voltage is 5.5 V.
5. If not as specified, replace the power transistor.
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