cold microwave

[Stormin Mormon]

Naah, it had a bad cold that day.

[badgolferman]

Okay, I have done more troubleshooting of the microwave. There are three interlock switches on the door and they all open and close properly. There is a secondary interlock relay on the circuit board that 115 VAC is getting through. That is directly connected to the primary windings of the transformer and when I took both leads of the transformer I read the 115 VAC on the White & Black wires. Ohms checking of the primary and secondary windings are lower than what the schematic shows which are 49 and 89 ohms respectively, more like 20 ohms or so. The high voltage diode cannot be read either way and a replacement that someone gave me from their old oven reads the same way. I tried that one out and still get no heat. I put my multimeter on the capacitor on its highest ohms scale and get a wavering reading.

I do not think the interlocks or the diode are bad. The transformer and the capacitor are probably good but I defer to the experts here. I do not know how to check the magnetron. There are two round black components inline with the power that I assume are the flame and gas sensors. My guess is they are good since power is getting all the way to the transformer.

Any more ideas?

[JIMMIE]

I used to troubleshoot these things with a fused "fool killer", connecting it directly to the primary of the transformer. This elininates a lot of the circuity in a hurry.

JImmie