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The 20 amp power fuse blows every time i start the mircowave oven?

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Hello,

One of the door switches has failed, the link below has a video that explains how to test and replace the microwave door switches.

http://www.appliancerepairlesson.com/2011/02/20/microwave-door-switch-test-microwave-repair-help-2/

http://www.appliancerepairlesson.com/

Posted on Mar 05, 2011

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The oven probably has a bad interlock monitor switch, one of several switches in a microwave that are operated by the door latches. The switch is wired so the fuse will blow if you try to run the oven with the door open, and it isn't operating properly when you close the door. As soon as the oven kicks on the power to the magnetron tube, the microwave source, the fuse blows. The switch may have been damaged if the door was slammed, or it's just a mechanical failure. It's not an expensive part, but any microwave repair involving the door should be done by a professional because of safety concerns, so you will have some labor cost to add in. It shouldn't cost as much as a new oven to make this repair, though, so it's probably worth fixing.

Posted on Jan 13, 2011

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GE microwave Model JVM1540DP1CC S/N HT931338B MFG. 5/2010. Fan comes on when door is opened. Also 20 amp internal fuse and the breaker blows if the door is opened while the microwave is cooking.


I don't have the Schematic but did you replace the fuse once? You may need a Slow Blow Fuse. They are marked and just look different

A slow blow fuse is different from a fast acting fuse in its capability to withstand transient pulse currents, i.e., it can withstand the surge current upon power-on/off, thus ensuring the equipment works normally. Therefore, slow blow fuses are often called time-delay fuses.

Hope I helped If I did please "Like"
Mike

slow-blow-fuse-yi4uwwt02ed0sicf2ibnwmdr-5-0.png

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How do I fix a blown microwave fuse?


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1 Answer

LG LMV1813ST MIRCOWAVE STOPPED WORKING?


The fuse can be replaced, but the underlying issue should still be investigated and resolved. Otherwise the new fuse will blow also.
If the microwave is not working the thermal fuse may have blown.
When a microwave stops working the problem is usually the line fuse or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.

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1 Answer

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There is a slo-blow 20 amp fuse inside of the ac power panel. You will have to remove the front and locate the fuse inside. This fuse suplies the power to the Traveling Wave Tube that spplies the microwave energy.

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1 Answer

Fuse size for sharp mircowave r 520ks


The fuse will be a 20amp ceramic. The fuse should be available at hardware stores, Radio Shack.
If the fuse is blown, there is a very good chance you have another problem, possibly a bad or misaligned door switch, shorted capacitor. Replace the fuse, if it blows again you will have to figure out why. Door switches are the most common reason for the fuse to blow.

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1 Answer

I keep blowing my 20 amp fuse, replaced mag tube and diode


Check the HV capacitor. It may be short circuited.
Also check the door switches. One of the switches (the monitor switch) is connected directly across the power and is there to blow the fuse in the event that the timing of the door switches are incorrect.
The monitor switches on Panasonic micros will also short.

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1 Answer

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9 amps is approx. correct. Does magnatron make an odd sound when running? If not, you will need to discharge cap then clean terminals with alcahol. Replace diode as well. Should run correctly.If blows again, replace magnatron. Suggest you put a 12 amp fast blow fuse in circuit and nor a 20 fuse.If you dont have a grill or an oven, use a 10 amp fuse.

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2 Answers

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In that case the outlet your using is pushing out too much electricity. Try calling your local electric company for help or a professional electric repair man.

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your oven was so high in volt try to use AVR 110 volts

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1 Answer

Neff combi blown diode.


If the diode failed by opening, there may be no other damage. If the dioded failed by shorting, the alternating current may have damaged other components. Ohm it out. You can get diodes from digikey.com, mouser.com, or radio shack or any electronics or appliance supply. If the diode is charred and you can't get the part number, the oven rating can be used to select a replacement. Since the fuse was 10 amps, the diode should also handle at least 10 amps. If you can power the unit and read the voltage at the diode input this will give you the power (volts times amps). It's always worth trying as it's cheaper than replacing the unit.

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