Magic Chef
Noisy High-Voltage Transformer or Magnetron
Microwave runs but makes a loud buzzing or humming noise, louder than normal, sometimes accompanied by a burning smell.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failing high-voltage transformer, Shorted or arcing magnetron, Loose mounting hardware on transformer, High-voltage arcing at connections
How to Fix / Troubleshooting
Safety: Unplug the microwave immediately if you smell burning or see smoke. Do not continue to operate it.
User-level observation:
- Note whether the noise occurs only when heating starts or all the time.
- If the noise is accompanied by no heating, the high-voltage system is suspect.
Technician-level inspection:
- Remove the outer cabinet and visually inspect the transformer, magnetron, and high-voltage wiring for burn marks or loose mounting.
- Check that all mounting bolts are tight and that components are not vibrating against the chassis.
- Test the transformer and magnetron for shorts or abnormal resistance.
Corrective actions:
- Tighten loose mounting hardware.
- Replace a noisy, overheating transformer or a shorted magnetron with Magic Chef-approved parts.
- Repair any arcing connections and replace damaged terminals.
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Repair Difficulty
Professional Required
5/5
Required Part
High-Voltage Transformer
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