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Repair and disassembly guides for GE Microwave ovens.

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Pop noise when first starting microwave.

GE Spacemaker 2.0 JVM2070BH02.

I was just heating a coffee cup of water to make tea. I always use 2 minutes and know that a few seconds more, it'll boil.

This time after 2 min .. water was cold. Tried again & the water was just warm. Add another 30 sec, got hot but no boil.

Ran it again later, 2.5 min .. almost boil.

It's set a power level 10 but seems like it lost some power (as if it was at 7 or 8).

It needs 25% more time to boil water.

New magnetron in 2018 when it had a loud hum & zero heat. The one-time pop this time is different.. is my magnetron starting to fail ? What else would make it act-up like this ?

Any insight would be appreciated.

Thanks, Ron

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Hi @ron_co

The noise could be due to a faulty HV diode in the HV (high voltage) section of the circuit but it could just as easily be any one of the other components in the HV section of the oven

There are 4 main components in the HV section of the oven, the HV capacitor, the HV transformer, the HV diode and the magnetron.

The first 3 produce the high voltage supply that drives the magnetron to produce the microwaves that heat up the food.

Open up the oven and check what the components look like.

With a lot of ovens the greasy air created during cooking is sucked in by the fan and ends up on the components which isn't too good considering the high voltages involved, e.g. arcing etc due to resistive connections created by the grease covering that shouldn't be there

Here's the mini manual for the oven that may also help, as long as you have a clamp ammeter and a high voltage DMM that is. See the flowchart for how to test and find out what component may be faulty.

Be safety aware when working in microwave ovens. The HV capacitor can store >5000V DC for months, even if the power to the oven has been disconnected for this length of time. This amount of voltage can seriously injure you. The HV capacitor needs to be correctly discharged as soon as it can be accessed after the cover has been removed from the oven and before any further work is commenced.

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Thanks for that info. That's the same info that came with unit and has been most helpful in the past .. AMP draw is a key element in troubleshooting.

Since my initial post, it no longer makes any heat so I did order a new mag.

It comes with a new diode, so I'll certainly change it out in the process.

Based on my notes, the one I last installed in 2018 was supposed to be "more robust" so, if true, replacing it with a GE compatable one seems "less robust". My original "GE" was a Samsung part from Malaysia.

Taking it off the wall is the hardest part. My microwave is as clean as a whistle :) We don't use it much. Thanks again, Ron

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