Question about Whirlpool MH7155XM Microwave Oven

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Whirlpool microwave mh7140xfq

I have purchased the diode for this model. I cannot locate the old diode to replace it. Diagrahms I find are not very clear. I have the front control pad off(hanging) and can see wires, cage blower wheel, etc. Do you have a real life picture pointing out the diode? Thanks.
steve

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  • Whirlpool Master
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Curious, but did you know the diode was shorted without measuring it before you ordered the new one? I hope that's the problem.

In any case, there should also be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

It usually has a perspective view drawing showing the relative locations of the components (parts layout).

If you don't have your tech sheet, you can find it online here and look on pages 3 & 4.

The diode (rectifier) is connected to one terminal of the high voltage capacitor and the other end goes to the chassis for ground.

It is located behind the magnetron in the back of the unit. You'll probably have to take the oven down from the wall to get to it safely.

Whirlpool customer service is here and you can also enter your model number on that page to download your owner's manual, installation instructions, etc.

Please read & heed the safety info in the tech sheet.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Oct 08, 2008

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est the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

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Here are some links you can use for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/cap_test.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

The average DMM doesn't have a high enough voltage to bias a high voltage diode, which is several diodes is series.

If the diode was not shorted, it was probably okay. They almost always short when they go bad.

I don't advise people on measuring a microwave's high voltage. The voltages can be instantly lethal.

The tech sheet should show you how to measure the resistance of the windings of the high voltage transformer. You know you're getting 120V on the primary.

The capacitor is probably okay because they usually short when they fail, and that would blow the fuse when you hit Start.

Look for corrosion or signs of melting on the FA terminal of the magnetron (and on the other temrinal if someone reversed the wires). Look fro a loose connection at the magnetron.

If these connections are fine, then you probably have a bad magnetron.

Probably the best prices on Whirlpool parts can be had here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Hope ya fix it!

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