Question about Sharp R-4A78 Microwave Oven

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Fuse blown and replaced it but keeps blowing new fuse

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Either s door switch is defective, or the capacitor is shorted.
If it blows immediately, check the door switches.
If it blows when trying to run the micro, check the high voltage capacitor. Be very cqreful when checking the capacitor as it can be very dangerous, holding a large voltage charge long after use.
Good luck.

Posted on Dec 30, 2010

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Dec 06, 2015 | In Microwave Ovens

1 Answer

Fix blown fuse on KGRA 806PSS oven


Check the fuse if it blown replace with new one

Sep 13, 2014 | Microwave Ovens

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Replaced 20amp fuse that was blown. new fuse did not blow, but oven is still dead.


see this causes and fix it. God bless you
If your microwave oven doesn't seem to work at all, check these: Fuses Door switch Fuses Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it. Door switch If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work
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Sep 22, 2012 | Cuisinart CMW-100 Microwave Oven

1 Answer

Microwave keeps blowing fuse


There are three possibilities, a bad magnetron, high voltage capacitor, and diode. In rare cases the high voltage transformer will be an issue but unlikely, if the microwave oven is more than 5 years old consideration should be given in replacement.

Nov 06, 2011 | Microwave Ovens

1 Answer

GE microwave oven model#JVM1441BH04 when you close door on switch activates and oven comes on. Only goes off when door is opened.


HELLO.

the problem your are experiencing with your microwave oven is a failed interlock switch.
Be careful when closing your microwave door. Slamming the door too hard is one of the main reasons that the interlock switch is damaged.

Slamming the microwave door shut can easily blow the microwave fuse, but they can also blow due to problems with the interlock switches.
A microwave oven will not function until the fuse is replaced.

Instruction on how to replace fuse on microwave.

1. Unplug the microwave from the electrical outlet to prevent electrocution. Place the microwave in a well-lit area to be able to locate the fuse.

2. Use a screwdriver to remove the outer cabinet of the microwave, and follow the power cord to the fuse. The fuse is located 2 to 3 inches within the microwave and is attached to the power board.

3. Observe the fuse to determine if it is blown. Blown glass fuses will produce burn marks on nearby surfaces, or the internal fuse wire will be black and melted, while ceramic fuses show no outward appearance of being blown.

4. Determine if a ceramic fuse is blown by testing it with an ohmmeter. If the ohmmeter reads zero ohms, your fuse is not blown. Other readings on the ohmmeter show that your fuse is blown.

5. Replace the blown fuse by popping it out of its holder, and snapping a new fuse in its place. Tighten the fuse clips by squeezing them together with your fingers.

6. Replace the outer cabinet of the microwave, and plug the microwave back into the electrical outlet. Test the microwave to see if it's working properly.

thanks.

Sep 22, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

I believe mine blew a fuse as well


Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it.
many people have been electrocuted with an unplugged microwave due to the enormous residual charge inside.

you can now get a new microwave at walmart for fifty bucks..........why monkey with a ten year old unit.

Aug 17, 2009 | Sharp R-963 Convection/Microwave Oven

1 Answer

Ge XL spacesaver Microwave blowing fuses


I had the same problem.
Took it in to the local repair guy and he found the transformer was blown.
Cost $120 including tax

Jan 15, 2009 | GE JVM1630 Microwave Oven

1 Answer

Blown Fuse


If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

Apr 01, 2008 | Emerson MW8775W Microwave Oven

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