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Quasar Microwave light bulb not working

Is your Quasar microwave light not working? The light bulb itself is the most likely cause. A burned-out microwave light bulb or cavity light should be replaced before testing other components. If your model uses a halogen lamp, test it with a multimeter for continuity or install it in an identical socket. Next, inspect the light socket and wiring, then test the main control board to verify it sends the correct voltage to the socket. A defective door switch, including a primary or secondary switch, can also prevent the light from turning on or stop the light button from functioning. Test each door switch for continuity, followed by the control board and micro switch if needed. These checks can help with a microwave light bulb replacement or microwave light burned out problem. Enter your Quasar microwave model number to find the exact replacement part for your appliance. If diagnosing the control board or wiring requires removing the outer cabinet, unplug the microwave first and remember that its high-voltage capacitor can store a lethal charge even after power is disconnected. The capacitor must be properly discharged before interior work, so contact a qualified technician if you are not familiar with that procedure.

01 - Quasar Microwave Light Bulb

The light bulb itself might be burned out. Replace the light bulb before replacing any of the parts associated with the light bulb
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02 - Quasar Microwave Halogen Lamp

To determine if a halogen lamp has failed, you can use a multimeter to test it for electrical continuity, or install the lamp into an identical socket to test it.
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03 - Quasar Microwave Main Control Board

Before replacing the control, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the control board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the control board is not sending enough voltage to the light bulb socket, replace the control board.
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Highly Likely

04 - Quasar Microwave Door Switch

A defective door switch may not signal the control board that the door is open or closed which may prevent the microwave light from turning on or prevent the button that controls the light from functioning. To determine if any of the door switches are defective, use a multimeter to test each of the switches for continuity. If any of the door switches do not have continuity, the switch or switches should be replaced.
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Highly Likely

05 - Quasar Microwave Control Board

A microwave light bulb not working could be caused by a defective control board, although this is rarely the case. Before replacing the control board, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the control board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the control board is not sending enough voltage to the light bulb socket, replace the control board.
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Common

06 - Quasar Microwave Micro Switch

A defective micro switch may not signal the control board that the door is open or closed which may prevent the microwave light from turning on or prevent the button that controls the light from functioning. To determine if any of the micro switches are defective, use a multimeter to test each of the switches for continuity. If any of the micro switches do not have continuity, the switch or switches should be replaced.
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Common

07 - Quasar Microwave Power Supply Board

A microwave light bulb not working could be caused by a defective power supply board, although this is rarely the case. Before replacing the board, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the power supply board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the board is not sending enough voltage to the light bulb socket, replace the board.
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Less Common

Frequently Asked Questions

Why is my Quasar microwave light bulb not working?
How do I test a Quasar microwave bulb or light socket?
Can a Quasar microwave door switch cause the light bulb not to work?
Should I replace the Quasar microwave control board if the light is out?
How do I find the correct Quasar microwave light bulb replacement?