Question about Emerson Mw9339sb Microwave Ovens

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Heat high fuse

Where is the fuse and can I replace it without the expense of sending to a repair person?

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R-9H84B. It just stopped working.Went to use it and nothing , thought it was unplugged. Repair man replaced the 20 amp fuse and it immediately blew. He said it was the transformer.Is it transformer?


It could be the transformer. Is it generating any smoke? They usually burn up because of shorted windings.

If the fuse blew, however, when the door was opened or closed, then you have a bad door switch.

If the unit heats, and the fuse blew after a few minutes, then you could have a weak fuse holder.

Jan 12, 2017 | Microwave Ovens

3 Answers

Fuse blowing...door switches OK


Yes, as DER says, you should unplug from AC and discharge the HV capacitor before before getting into any MW repair. In the old days we'd just crowbar the cap with a screwdriver (be sure the handle is insulated!). Nowadays manufacturers recommend discharging through a resistor, which results in much less spark.

Once you've confirmed a hard fault exists by replacing and blowing another fuse, there are a few simple things you can look for. A failed HV diode is usually accompanied by a very obvious burn odor. If the magnetron filament shorts to case, you will read low (<1-ohm) resistance between case and one of the filament terminals. Sometimes a sharp eye, ohm meter and wiring diagram will lead you to find a unique problem (pinched wire, loose screw in the works, etc).

Disconnect filament terminals from transformer to eliminate possibility that the transformer is the source of short. Don't be fooled by low filament resistance between the two terminals. Some good magnetrons will read ZERO ohms!

With the exception of fuse and HV diode, these parts are generally expensive compared to the cost of a new MW oven. Prices on magnetrons vary quite a bit though, so it's worth looking online or calling your parts store. Bad panel? This MW is almost certainly doomed.

You can't really afford to replace parts (even if you do the work yourself) without a highly certain diagnosis. Certainty is hard to come by, especially if the fail takes a while to occur or is intermittent,

Nonetheless, if you feel certain that you have found the defective part and have a sense of adventure, you might be able to fix it.

Jun 20, 2016 | Microwave Ovens

1 Answer

OPENED UP DOOR - PUT GLASS CUP IN TO HEAT WATER AND IT WOULDN'T HEAT. CLOCK IS ON AND LIGHT COMES ON. COULD THIS BE A FUSE???


Chances are that the high voltage circuit or possibly the magnetron tube may be defective...the fuse inside is for the whole unit..,.the magnetron tube is the device that emits the microwave radiation...you may need to have a qualified person examine the unit to see what is bad inside..I don't recommend unqualified persons doing this as there are potentially FATAL voltages inside needed to power up the mag tube(around 2100VAC)...If the service man tells you it is a mag tube then you may want to look in to purchasing a new micro..as mag tubes are very expensive

Mar 28, 2011 | Maytag Microwave Ovens

1 Answer

Runs like normal but won't heat anything. Microwave randomly turned on by itself. It ran for a while without anyone noticing. Now it will turn on but it won't heat heat anything up.


Before you remove the microwave casing, you need to read up on how to discharge a high voltage capacitor, i'd explainb it here but i feel much safer if you were to look it up and fully understand it before attempting any repairs as the high voltage capacitor can cause fatal injury and/or death.

Ok, after reading up about how to discharge a high voltage capacitor, this is what you need to check out.

Step 1, remove the microwave casing and discharge the high voltage capacitor to prevent injury or death.

Step 2, Look for the fuse which you may find in a small plastic case with wires coming from each end, one end leading to the high voltage capacitor and the other end leading to the transformer and the magnatron assembly, the magnatron, or maggy, has a cube-ish shape and contains magnets which are visable through the grill. You will be able to see with the naked eye if this fuse is faulty as it will look like a blown fuse, if so, replace the fuse.

Step 3, At this point if you have a spare fuse you can VERY CAREFULLY plug the unit in and VERY CAREFULLY test it to see if it heats, if it does heat then VERY CAREFULLY unplug the unit, discharge the capacitor, and replace the case. If it still isnt heating you will need to replace the magnatron assembly, contact your authorised repair agent or the manufacturer or the microwave for directions to spare parts. Be very careful with new magnatron assemblys because if you drop it, you will damage or fracture the magnts within and render it useless.
I hope this helps. Good luck

Apr 06, 2010 | Magic Chef Microwave Ovens

1 Answer

It does not get hot


Hi, Unfortunately there are several things that can cause no heat.

1. The High Voltage Capacitor
2. Power Diode
3. Magnetron
4. Control Board
5. Door interlock
6. High temp cut off temp sensor
Most of the time it is either the Capacitor or Power Diode that fails. These two are not expensive repairs. Actually 1,2, 5 & 6 are reasonable repairs.

3 & 4 will cost at least 50% of the replacement cost of the unit.

I still think you will get off with a reasonable repair expense.

The Diode and Capacitor can be found here:

http://www.repairclinic.com/Appliance-Parts?s=t-jvm1630-%3d%3ded617017i254740g4

A repair person may opt to modify the diode installation to a less expensive diode that will still work normally with no danger. I.e. a $23.00 Diode vs a $53.00 Diode. Same electrical function.

Jan 23, 2010 | GE JVM1630 Microwave Oven

2 Answers

Microwave runs but won't heat


hello there
here are some things to look for
If the power is on, but it does not work check to make sure the door closes and aligns properly. Microwave door switches have metal terminals on the end that make contact with the door hook or latch. This completes the circuit which allows the microwave oven to run and without this contact the microwave will not operate. A simple misalignment might be breaking the circuit causing the microwave not to operate. If you suspect that the thermal fuse has blown, call a professional appliance repair person. Even an unplugged microwave oven can kill or seriously injure someone. This is because there is a high energy capacitor inside the microwave oven case. If it is not discharged properly, you could be electrocuted.
If your microwave buzzes or hums but does not produce any heat, it could be a faulty defective diode, triode, high-voltage capacitor, or even a faulty magnetron. However, this problem usually means a bad means a bad magnetron, followed by a bad diode. Call a professional appliance repair person for assistance.

Nov 14, 2009 | GE Hotpoint RVM1535 Microwave Oven

2 Answers

My microwave is no longer putting out any heat


The problem could be caused:
top door micro-switch
or
Answer: First, make sure your microwave is plugged in and getting an ample supply of power. If the power is on, but it does not work check to make sure the door closes and aligns properly. Microwave door switches have metal terminals on the end that make contact with the door hook or latch. This completes the circuit which allows the microwave oven to run and without this contact the microwave will not operate. A simple misalignment might be breaking the circuit causing the microwave not to operate.
If you suspect that the thermal fuse has blown, call a professional appliance repair person. Even an unplugged microwave oven can kill or seriously injure someone. This is because there is a high energy capacitor inside the microwave oven case. If it is not discharged properly, you could be electrocuted.
If your microwave buzzes or hums but does not produce any heat, it could be a faulty defective diode, triode, high-voltage capacitor, or even a faulty magnetron. However, this problem usually means a bad means a bad magnetron, followed by a bad diode. Call a professional appliance repair person for assistance.
Warning: Microwave ovens are probably the most dangerous of consumer appliances to service due to the very high voltages (up to 5000 V) at potentially very high currents. If you have any doubts about your knowledge and abilities, replace the oven or have it professionally repaired.

Oct 06, 2009 | KitchenAid KCMS185J Microwave Oven

3 Answers

I have a emerson microwave that has stopping heating, model #mw8119sb, please help me


Emerson may be able to tell you which part has failed but you may have to have the unit looked at be a small appliance repair person. Send Emerson an email to internet@emersonradio.com with your model number and the problem you're having. If the unit is out of warranty, it may be cheaper to replace the microwave depending on what you paid for it. Keep in mind that the labor on any repair will be a minimum of $50 if you have to take it someone's shop, and that doesn't include the price of the part. Any part needed would be purchased from Fox International who's the part distributor for Emerson. They wouldn't know which part you need, however, because they're just a large parts store. Below is the link for Emerson's website.

http://emersonelectronics.ca/emerson/en/home/

I hope I've provided you useful assistance and that this information allows you to make an informed decision as to how to proceed from here. Please be sure to vote on my response. I hope I've earned a good rating from you today.

Please post a comment if you need additional assistance so that I can help you further.

Aug 04, 2009 | Emerson MW8168B Microwave Oven

1 Answer

Microwave not heating food


It's most likely the Magnetron. The are not very easy to install and quite expensive. Older models magnetrons cost about 80 bucks from GE. It's probably not something you would want to try and repair yourself. Call a GE service person.

Feb 03, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

GE JVM1870 Runs, but won't heat up


My brother check the magnetron and the high voltage cap they are bad.or you got to take your microwave to a tech replace both component.good luck.

Apr 03, 2007 | GE JVM1870 Microwave Oven

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