Power Transistor HVAC: Testing and Inspection
When Using a Diode Tester1. Disconnect the power transistor connector.
2. Verify that the voltage between the terminals of the power transistor connector (male) is as shown.
3. If not as specified, replace the power transistor.
When Using a Resistor
1. Remove the power transistor.
2. Verify that the battery voltage is 12V.
3. Set the circuit by using the resistor (1 K Ohms rated power: 0.25W), the voltmeter, and battery as shown in the figure.
4. Verify that the voltage is 5.5V.
5. If not specified, replace the power transistor.