Question about Microwave Ovens
There are about as many causes of this as there are parts in the set. To Start with, Check that the microwave is not plugged into a GFCI wall socket.. If it is, make sure the socket has not been tripped. If it has reset it. Make sure the set is unplugged for the rest of this. Follow the power cord in the unit to find the primary fuse. You'll need to test the fuse with a Continuity tester since this fuse usually a ceramic fuse and you can't just tell by looking at it. If that's good, the problem will most likely be a mini fuse on the controller board or a fuselink that's in side the small transformer on the controller board. If lightning is suspect, you can pull the board out and look at the circuit side to check to burned traces. Replace any MOVs that may be on the board otherwise any corrective work is just wasted. Back to the primary fuse... If the primary fuse is blown.... Chances are that you have a bad Diode in the Tube side of the circuit. Depending on the age of the unit... it maybe a HVR-1 diode. If their are no relays on the controller board, check for a bad Triac. It could be just time to junk it.
Posted on Sep 07, 2008
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