Panasonic Microwave

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  • March 18, 2010 at 8:24 pm #53349
    johnnyhoz
    Participant

    Haven’t looked a microwaves for a few years and have forgotten how to fault find on them. Whatever the timer is set on it cuts out after 10 seconds, the light goes out and the turntable stops but the fan keeps running for about a minute, even after several attempts no heat is generated in a cup of water, please advise

    John

    March 18, 2010 at 8:34 pm #315487
    A1TEC
    Participant

    Re: Panasonic Microwave

    Could be magnatron fault, had a commercial Panasonic do the same thing.


    John.

    March 18, 2010 at 8:45 pm #315488
    johnnyhoz
    Participant

    Re: Panasonic Microwave

    Hi John
    is there a test for the magnatron ?
    John

    March 18, 2010 at 8:51 pm #315489
    A1TEC
    Participant

    Re: Panasonic Microwave

    You can check between the terminals for a reading and between the terminals and the body of the mag.

    I cheat a little, got a plastic block that lights up like a disco if microwaves are being transmited. 😆


    John.

    March 18, 2010 at 8:56 pm #315490
    A1TEC
    Participant

    Re: Panasonic Microwave

    Meant to say reading should be less than 1 ohm across the terminals if mag is o.k.

    John.

    March 18, 2010 at 9:12 pm #315491
    SWERV
    Participant

    Re: Panasonic Microwave

    What model is it? It could possibly be the inverter at fault.
    Merv

    March 18, 2010 at 9:38 pm #315492
    Grendal
    Participant

    Re: Panasonic Microwave

    If it has an inverter board pretty much guaranteed to be the magnetron.

    Check the magnetron for earth leakage and also have a good look at the magnet had quite a few where the magnet is cracked this caused the machine to shut down.

    Hope that helps

    March 19, 2010 at 12:20 pm #315493
    johnnyhoz
    Participant

    Re: Panasonic Microwave

    The model is NN-A724MBBTQ

    March 19, 2010 at 12:58 pm #315494
    microgerry
    Participant

    Re: Panasonic Microwave

    Hi. In your first post you said it cuts out after 10 seconds.

    Could you check again and see exactly how many seconds? (My apologies if it is in fact 10) It could point us to a more accurate diagnosis

    Gerry

    March 19, 2010 at 1:23 pm #315495
    johnnyhoz
    Participant

    Re: Panasonic Microwave

    Hi Gerry
    starts off cutting out at 10 seconds but after several restarts reduces to 8

    john

    March 19, 2010 at 1:32 pm #315496
    johnnyhoz
    Participant

    Re: Panasonic Microwave

    just noticed a small arcing noise and a click when it cuts out coming from the control board there are three relays in a row its i think coming from the one with the blue conector

    John

    March 19, 2010 at 4:19 pm #315497
    SWERV
    Participant

    Re: Panasonic Microwave

    I would definately be looking at the magnets on the magntron, you can normally see if they are cracked.
    Merv

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