The magnatron, diode, and motherboard have been replaced and the fuses continue to blow when the machine is turned on. All parts show continuity and there is no obvious short in the machine. What should we do?
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Most Frequent Causes for Microwave not working Thermal Fuse
The thermal fuse cuts off power to the microwave if the microwave overheats. To determine if the thermal fuse has blown, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. The thermal fuse cannot be reset-if the fuse is blown, it must be replaced. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the thermal fuse The thermal fuse cuts off power to the microwave if the microwave overheats. To determine if the thermal fuse has blown, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. The thermal fuse cannot be reset-if the fuse is blown, it must be replaced. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the thermal fuse
This is probably because there are some defective capactors in the oven. If you replace the magnatron without replacing the caps your going to be blowing it again. Be vert careful those caps store high voltages and must be discharged before you do anything. It could also be a defective rectifier bridge even if only one diode is bad
HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.
(((The fuse is located inside the unit along side the blower)))
Normally if no power is indicated, it is due to a blown fuse but if fuse has blown be careful, it because there is something wrong. Mostly its due to a problem in the power circuit.Can either be the magnatron or the diode capacitor combination.Normally the capacitor goes faulty causing the HV diode to blow. Replace the two components(diode and cap.). If it happens again replace the magnatron. Microwave truely dangerous and needs proffesional att. email me if you want to go ahead yourself firstname.lastname@example.org
9 amps is approx. correct. Does magnatron make an odd sound when running? If not, you will need to discharge cap then clean terminals with alcahol. Replace diode as well. Should run correctly.If blows again, replace magnatron. Suggest you put a 12 amp fast blow fuse in circuit and nor a 20 fuse.If you dont have a grill or an oven, use a 10 amp fuse.
It might be the cap but it is probably a bad diode. The diode if shorted to the cabinet will of course blow the fugging fuse every time. The diode should have continuity in one direction only. If the 2 leads between the mag are shorted to chassis the fuse will also blow. You have 3 suspects the diode the cap and the mag. I would replace the cheapest thing first and that would be the diode and i am correct a shitload of times. Peace brother.
BEFORE YOU DO ANYTHING, DISCHARGE THE HIGH VOLTAGE CAPACITOR!!!!! Now that you have done thatCould be a few things, im a qualified tech and i get stuck with heaps microwaves with the same problem. It could either be the MAGNATRON or the HIGH VOLTAGE FUSE, but check with a multimeter on continuity(beep test) for any protective diodes (or any other diodes) that may be short.
IF YOU DO NOT KNOW WHAT YOU ARE DOING TAKE IT TO SOMEONE WHO DOES, THE ''DANGER: HIGH VOLTAGE'' ARE NOT THERE FoR FUN.!!!!
just aquired one just like it for free. they said no heat. took the outer cover off. about 12 screws. pull the main fuse and test it with a continuity tester.thats probably not it if the lights work. its either the magnatron (toshiba 2m248j(gs) or replacement part amana 8205460. mine was a coroded magnatron connection.unplugged it and pluged it back in. heats fine now. if you left it on with nothing in it for any length of time you blew the magnetron. universal magnatron replacements on ebay are $25. 4 screws and a 2 prong connector.
it sound to me as if the high voltage diode is shorted. It could be inside the capacitor or out board the cap. The capactor could also be short but this is a rarity. Diodes are a cheep item . repace it and if it don't work its probably the magnatro. good luck.
sounds to me like the magnatron has shorted out. i don't know of a way to test them unless you have some high dollar equipment. a continuity test prob wont tell you anything. what reading did you get on the cap when you tested it?