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Old 02-06-2013, 01:11 PM
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HI.

Remove the plug from the transformer's primary winding and check if there is 120VAC with the MW turned on.If you have correct voltage - replace the magnetron (it lost the vacuum) Part number: W10126786

Part number: W10126786


If not - there is the problem with the control board.

Here are the breakdown diagrams and 03-Interior and Ventilation Parts parts for Maytag MMV4203DS00 - AppliancePartsPros.com

Post the results.

Simon.
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