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Repair and disassembly guides for microwave ovens.

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1980's Quasar microwave - Model MQ7720TW - Start button just clicks

I have an old Quasar microwave from the 1980's - Model MQ7720TW. The Start Button does not engage - All other buttons appear to work. Where do I get it fixed in Dallas/Fort Worth area or is it a easy fix to do myself?

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I’d start with the line fuse:

Cause 1

Line Fuse

If too much current passes through the microwave circuitry, the line fuse will blow. If the line fuse blows, the microwave won’t start. To determine if the line fuse is at fault, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. In addition, you should investigate and resolve the problem that caused the fuse to blow. If you don’t resolve the underlying issue, the new fuse will blow too. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the line fuse.)

Parts

Line Fuse for your Quasar Microwave

RepairClinic Item #757856

Ceramic fast blow fuse, 15 amps, 250 volts

https://www.repairclinic.com/RepairHelp/...

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Sounds like the door switch is bad. If it is not tripping, the start button will not work. Here is a link to the door switch part.

https://www.repairclinic.com/PartDetail/...

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Bad door switch will cause the start button to just click ? Why do all the other buttons work , just not start button ? Don't think that is issue

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Robert Stan さん、ありがとうございました!
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