NEFF MICROWAVE h7871nogb

[dna]

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.

[Phidom]

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.

[SWERV]

Re: NEFF MICROWAVE h7871nogb

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

[dna]

Re: NEFF MICROWAVE h7871nogb

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

[gegsy]

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

[Author]

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