NEFF MICROWAVE h7871nogb

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  • April 20, 2008 at 10:17 am #36158
    dna
    Participant

    Hi have this microwave which the high voltage diodes were faulty. i have changed them and this microwave still doesn’t start. all other functions work apart from the microwave. i suspect pcb, but its expensive just to suspect. any help will be great.

    April 20, 2008 at 11:50 am #249803
    Phidom
    Participant

    Re: NEFF MICROWAVE h7871nogb

    First check if you are getting 240 volts at the transformer primary. If you are then you still have a fault in the microwave circuit. Even if the other functions work it could still be a faulty door microswitch. These switches usually come apart so I tend to take the cover off each switch and check for burnt or welded contacts. Obviously you check that all the switches are being depressed correctly before and after removing them.

    April 20, 2008 at 1:11 pm #249804
    SWERV
    Participant

    Re: NEFF MICROWAVE h7871nogb

    Might be a silly question. If the diode was short circuit, did you change the fuse??

    April 20, 2008 at 3:42 pm #249805
    dna
    Participant

    Re: NEFF MICROWAVE h7871nogb

    yes i did change the 10amp fuse but still not functioning.

    April 20, 2008 at 6:50 pm #249806
    gegsy
    Participant

    Re: NEFF MICROWAVE h7871nogb

    In instances of HT problems, I usually change the diode,limiter and HT capacitor.
    Also there is a 1.25 A LT fuse on pcb that can go west so if you are not getting any voltage to HT TX as Phidom said, that may be the reason.

    HTH

    Greg

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