An electronics technician is troubleshooting an inoperative single-phase ventilation blower that fails to operate when energized. In what sequence should the technician perform the following diagnostic and repair actions to follow standard, safe troubleshooting procedures from initial assessment to final verification?
- 1Verify nominal supply voltage at the main input power terminals using a digital multimeter set to AC voltage.
- 2Measure the voltage drop across the closed control switch contacts to determine if the switch is passing power.
- 3De-energize the power source and verify zero voltage following lockout/tagout safety procedures.
- 4Disconnect at least one motor winding lead and measure the winding resistance with an ohmmeter.
- 5Replace the defective motor and re-energize the circuit to verify normal operation.
Cevap
The correct logical sequence is: verify supply voltage at the input terminals, measure the voltage drop across the closed control switch, de-energize and lock out the power source, isolate and measure motor winding resistance with an ohmmeter, and finally replace the defective motor and test operation.
Standard electrical troubleshooting begins with verifying the source power, followed by live circuit voltage checks across active control elements. Once the faulty branch or load is localized, the circuit must be safely de-energized before isolating components for resistance testing. The final step is component replacement followed by an operational verification test.
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Logical Troubleshooting and Safety Sequence
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