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HomeRepair HelpQuasar Microwave RepairQuasar Microwave is loud or noisy Repair
Quasar Microwave is loud or noisy
Is your Quasar microwave making a loud noise, grinding noise, buzzing noise, or humming loudly? Start with the fan motor, the most common cause. Worn fan motor bearings can produce rumbling or squealing while the microwave runs, and the motor should be replaced if it is noisy. Next, check the magnetron. A normal magnetron makes a low hum, but a damaged magnetron may growl or emit a high-pitched sound. A failing high-voltage diode can also make the magnetron noisy, so test the diode before replacing the magnetron. If the noise comes from the vent, inspect the exhaust fan motor by turning its blades by hand and testing for power and continuity. A worn glass tray support, also called a turntable roller guide, can rattle as the glass plate rotates. Finally, a failing stirrer motor may make grinding noises as its internal gears wear. Any repair requiring the outer cabinet to be opened involves serious shock risk. The high-voltage capacitor can store a lethal charge even after the Quasar microwave is unplugged and must be properly discharged before interior work. Magnetron, high-voltage diode, and other high-voltage repairs may require a qualified technician. Enter your model number to find the exact replacement part for your microwave.
01 - Quasar Microwave Fan Motor
The fan motor bearings can wear out causing a rumbling or squealing noise. If the fan motor is making noise when its running it will need to be replaced.
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02 - Quasar Microwave Magnetron
The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances, the magnetron emits a low hum. However, if the magnetron is damaged or nearly burned out, it may begin emitting high-pitched sounds or growling noises. If the magnetron is noisy, this indicates that the magnetron is nearing the end of its life or might be defective. A defective high-voltage diode can also cause the magnetron to be loud. Before replacing the magnetron, first test the high voltage diode. If the diode is not defective, replace the magnetron. (Warning: The microwave oven c...
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03 - Quasar Microwave Diode
The diode converts the AC power output of the transformer to DC, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron to heat the food. A failing diode can be responsible for a noisy magnetron. When the diode fails, it is often visibly burned out. Inspect the diode and if the diode is burned out, replace it. If inspecting the diode proves inconclusive, test it with a multimeter that uses a 9-volt battery or put a 9-volt battery in series with the diode. When the leads are reversed, the diode should only have continuity in one direction.
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04 - Quasar Microwave Exhaust Fan Motor
To determine if the fan motor is defective, remove the fan motor from the microwave and try turning the fan blades by hand. If the blades do not turn freely, replace the fan motor. If the fan blades do turn freely, use a multimeter to test the motor for incoming power and for continuity. If the motor has power but won’t run, replace it. If the motor does not have continuity, replace it.
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05 - Quasar Microwave Glass Tray Support
The microwave glass tray support is the component that sits under the glass turntable tray to support the tray as it rotates. Over time, the small rollers on the support can wear out and start making a noise as the tray turns. If you've determined the glass tray support is the source of the noise, the part should be replaced with a new one.
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06 - Quasar Microwave Stirrer Motor
The stirrer is a metal blade which slowly rotates inside in the microwave. As the stirrer turns, it deflects the microwave energy randomly throughout the microwave. As the stirrer motor wears down, it begins to make grinding noises. To determine if the stirrer motor is worn out, check to see if voltage is getting to the motor. If the motor has the proper voltage, but is noisy or won’t turn, replace it. (Note: Proper voltage can be determined by reading the label on the motor. Because the stirrer motor is a geared motor, the shaft will not spin freely.)
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Frequently Asked Questions
Why is my Quasar microwave making a loud or noisy sound?
How do I know if the microwave fan motor is causing the noise?
Could the turntable support or stirrer motor be causing a grinding noise?
Is a noisy Quasar microwave dangerous if the magnetron or diode is involved?
How do I find the correct Quasar microwave noise-related replacement part?
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