the microwave seems to work but then after about 25 seconds it stops and the time resets and goes back to the clock & the food inside it has not heated it at all you said that it could be magnotron, diodes, or power supply i have changed the magnotron but it hasn't made any difference could you tell if the diodes are on the inverter board & the supply is on the first board ps ill be carefull around the high voltage im a electrican i deal with 500volts every day thanks dom
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Microwave Ovens Master
Re: Panasonic dimenion 4/ nna772sbbpq
This can happen due to a bad door switch.
When you are decided to fix it and work on it, there's *critical* safety, disassembly, and troubleshooting info site (as well as a text file which helps in diagnosing and repairing door switch problems) click here.
Some helpful exploded view diagrams and order parts by entering your model number here:
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Check to make sure one of the plastic hooks on the door was not broken off. If both door hook latches are functional then the most likely cause of your problem is one of the latch switches located behind the control panel. These switches will fail if the oven user opens the door frequently BEFORE the cook cycle ends. Always push STOP/RESET before opening any microwave oven door.