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Power is very weak, blows fuses
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Model: FMT139E1W1 Brand: Frigidaire Age: 5 - 10 years
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Wayne T  
#1 Posted : Sunday, December 4, 2011 10:28:14 AM(UTC)
Wayne T

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Joined: 12/4/2011(UTC)
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We bought this microwave new. It was cooking and used a lot the day it went down. It got extremely hot, then blew a fuse. We replaced the fuse and plugged it back in, the display lit back up, but very dimly. Then we tried to start it, and it immediately blew the fuse. Tried twice, but to no avail.

Would love to have this back working, as parts are very limited. What can we do to try to resolve this issue?

Thanks in advance,

Wayne McCullough
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ApplianceJunk  
#2 Posted : Sunday, December 4, 2011 11:08:28 AM(UTC)
ApplianceJunk

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I would first try to isolate the problem to determine if the trouble was on the high voltage side or not.

To do this I would remove the 120 Volt wires that feed power to the high voltage transformer and run the microwave. If it no longer blows the fuse then it's for sure something on the high voltage side causing the problem.

The high voltage side included the transformer, magnetron, capacitor and diode.
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Wayne T  
#3 Posted : Monday, December 5, 2011 2:13:48 AM(UTC)
Wayne T

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The wires feeding the transformer go into a coil first .............Are these the ones you are referring to?
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ApplianceJunk  
#4 Posted : Monday, December 5, 2011 4:43:40 AM(UTC)
ApplianceJunk

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Originally Posted by: Wayne T Go to Quoted Post
The wires feeding the transformer go into a coil first .............Are these the ones you are referring to?


I could not find a wiring diagram to look at, but they would be the wires that feed 110-120 Vac to the high voltage transformer. Often one wire is black and the other is white and they plug in to the transformer.

You need to be very careful when working on microwave ovens because even when they are unplugged the high voltage capacitor can still hold a very powerful charge of electricity.
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