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microwave oven controller schematic

Discussion in 'Electronic Repair' started by John Ely, Nov 11, 2003.

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  1. John Ely

    John Ely Guest

    Does anyone know where I can find a schematic of the controller in an
    Amana microwave oven?

    The controller is made by Robert Shaw and the model may be LR51702.
    It was made about 1987.


  2. James Sweet

    James Sweet Guest

    It likely doesn't exist, and shouldn't be nessesary anyway, what's the
    problem you're having?
  3. David

    David Guest

    The schematic probably was never available as the replacement part was the
    entire controller board, as with almost all appliances.
  4. John Ely

    John Ely Guest


    There is a relay in the primary circuit of the HV transformer that has
    its coil voltage supplied by the control card. The relay coil has
    continuity, but no voltage across it.

    The timer runs and displays the time, and it even beeps when the time
    is finished, but the relay never gets coil voltage.

    There is nothing obviously burnt on the circuit board and the parts
    I've checked seem OK.


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