Greetings friends I want to make a query about this microwave which presents the following fault turns on every fan, light but does not heat, this equipment was given to me because it did not work or responded to any key on the control panel, I did tests on the menbrana that is where the keys are, and had many broken tracks, I saw a video where the keys are replaced by buttons and I did it and when testing the keyboard worked well but when doing the test it does not heat, I put a time of 1 minute to See what happens and I notice that something silent starts after 10sg sounds like the life of the contacts of a relay and a buzz is heard as in the transformer. I thought that the keyboard was wrong, the owner told me when he handed it to me that even the keys failed to work well, trust me and do not check thoroughly well the truth is that I tried the magnetron with the filament tester gives continuity 0.3 ohms to mass that is to say, no continuity, the diode provides it with a lamp in series and turns on the lamp as 50% it seems good to me the capacitor is 0.80uf 2000volts I check it with the tester it measures me well it is not open or short, I put a lamp in 20w series of the same microwave light as 40 or 45% or capacitor without short, I measured with the tester in a capacitor and measures 830 nano it seems normal, maybe this somewhat dry because this device according to the owner was like five years without working I have one of 1uf 2100volts would like to mount it to test and discard but I have doubts I made another test with a neon of those that have the fluorescent starters I put it inside the oven I turned it on and the neon took about 3 or 5 seconds of spues did not do this anymore confuses me because I think of the magnetron and I see that it generates although it is for a moment now I do not know if it is the capacitor, another test disconnected one of the terminals that are in the magnetron and there is no more humming also measured consumption with ammeter when starting 4 amp when it starts to buzz it goes up to 6 fast and falls to 3 amp when I remove the connector the consumption stays at 4amp

hello friend greetings, the first thing is to change the high voltage diode change it. I don't trust these diodes are misleading, change it. And try if the fault continues it could be the high voltage transformer but first discard the diode and I commented result then we continue regards. Atte Héctor de Venezuela

Thank you, friend. Years for responding, I already tested with another diode of a furnace that works, but the transformer remains the same with a 10-volt transformer connected to the primary, measured in the 277volt secondary, what I did not probe was the filament voltage, how much should I give? with the 10 volt transformer in the primary if you know please guide me thank you

ok then do the following disconnect the two wires that feed the large transformer then on those two wires place a multimeter on an alternating current scale then start the microwave, and see what voltage you have 110 or 220 either you take home if the voltage It is correct to change the magnetron friend and I said greetings. Atte Héctor de Venezuela

I did that test there are the 110 volts that come out of the relays I don't have a magnetron to discard I want to measure the voltage that comes out of the transformer to the filament,