Question about GE JVM1860 Microwave Oven

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Noisy motor in top of microwave GE Model JVM1640BB

I have the same problem but what I'm worried about is if I change the stirrer motor (Synchronous motor P/N EX73MRAA) what is the possibilty of getting shocked? I understand that microwaves hold a lot of voltage even if they are unplugged. The part says it carries 21V AC.

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First of all, Disconnect the mains, now remove the cover then inside you`ll find the Magnetron, This is a large metal box with cooling fins around it with a fan in front, at the bottom of the Magnetron, you should see two thick wires, one of these goes to the transformer which is the large box with thick coils of wire inside. The other wire goes to a capacitor, This is the component that stores the voltage. Get a pair of well insulated snipe nosed pliers and wrap these in a thick dry towel or thick coat. Place one of the jaws of the pliers on the metal casing of the oven and then slowly push the other jaw into the connector in the capacitor where the thick wire goes in. You`ll probably find nothing happens because there`s a bleed resistor built into the capacitor but sometimes, these can fail and the 1500-2000 volts that`s stored in the capacitor could remain there for years. Simply connect the pliers across the connections in turn (If there`s more than 1) to the casing and you will be fine. The worst that can happen is you`ll see or hear a loud crack, just like you would expect off a spark plug in a car. If it does spark or crack, make sure you connect the pliers onto the connector(s) within the capacitor to make sure that it is completely discharged. While you`re carrying out the repair, keep touching the pliers onto the capacitor every five to ten minutes or so because the capacitor can start to regain a little charge even after you`ve dumped the voltage. A little like a car battery where you can try to start your car, it won`t start but if you leave it for ten minutes, the battery may have recovered enough to start the car. Ian

Posted on Jul 23, 2009

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Stirrer fans in microwave ovens are old technology which has almost universally been replaced by turntables. I haven't seen one for 20 years or more.

I believe the stirrer fan is driven by a small synchronous motor. That type of motor is very reliable and long lasting and rarely suffers electrically, though that isn't impossible. They are, however, prone to seizing in some environments due to the design of the bearings which are fully exposed to the elements and mostly are of a sintered material impregnated with lubricant.

Mostly freeing off and lubricating the synchronous motor is quite straightforward if that is found to be the problem when you investigate.

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  1. MagnetronIf your microwave is emanating high pitched or growling noises during operation, the magnetron could be going bad. Normally a nearly silent part, the magnetron uses high voltage and induces the frequency required to cook food. Although normally not a safety hazard to operate, this is a sign that the magnetron is failing and will need to be replaced as soon as possible.
  2. Exhaust fan motorIf your microwave is making a very loud humming noise during operation, it could possibly be the exhaust fan motor. If defective the part will need to be replaced to silence the appliance once more.
  3. Stirrer motorAnother leading cause of a noisy microwave is an expired stirrer motor. With use this part becomes worn and makes a loud grinding noise, which is usually a leading indicator that the part needs to be replaced. The stirrer is a metal blade that is slowly turned by the motor. This action disperses the microwave energy in a random pattern, which heats the food evenly. If the stirrer motor is determined to be nearing expiration, it should be replaced to halt the grinding noise.
  4. Turntable motorA very common cause for a noisy microwave is a worn out turntable motor. This is a relatively easy repair and will put an end to the noise once replaced.

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  1. MagnetronIf your microwave is emanating high pitched or growling noises during operation, the magnetron could be going bad. Normally a nearly silent part, the magnetron uses high voltage and induces the frequency required to cook food. Although normally not a safety hazard to operate, this is a sign that the magnetron is failing and will need to be replaced as soon as possible.
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  3. Stirrer motorAnother leading cause of a noisy microwave is an expired stirrer motor. With use this part becomes worn and makes a loud grinding noise, which is usually a leading indicator that the part needs to be replaced. The stirrer is a metal blade that is slowly turned by the motor. This action disperses the microwave energy in a random pattern, which heats the food evenly. If the stirrer motor is determined to be nearing expiration, it should be replaced to halt the grinding noise.
  4. Turntable motorA very common cause for a noisy microwave is a worn out turntable motor. This is a relatively easy repair and will put an end to the noise once replaced.

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If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.

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Exhaust Fan Motor


If the microwave is loud when running the fan motor might be

Enter your model number to see parts for your microwave.

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Stirrer Motor


If the microwave is loud or noisy the stirrer motor might be worn out. The stirrer is a metal blade which slowly turns around, deflecting the microwave energy in a random pattern inside the microwave oven. As the motor nears the end of its useful life it begins to make grinding noises. The microwave will not heat food evenly without this stirrer, the motor should be replaced.

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Turntable Motor


If the microwave is loud or noisy the turntable motor might be worn out. This is a common problem and relatively easy to replace.
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Magnetron If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.

Exhaust Fan Motor If the microwave is loud when running the fan motor might be
Stirrer Motor If the microwave is loud or noisy the stirrer motor might be worn out. The stirrer is a metal blade which slowly turns around, deflecting the microwave energy in a random pattern inside the microwave oven. As the motor nears the end of its useful life it begins to make grinding noises. The microwave will not heat food evenly without this stirrer, the motor should be replaced.

Turntable Motor If the microwave is loud or noisy the turntable motor might be worn out. This is a common problem and relatively easy to replace.
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Turntable Motor If the microwave is loud or noisy the turntable motor might be worn out. This is a common problem and relatively easy to replace.
Stirrer Motor If the microwave is loud or noisy the stirrer motor might be worn out. The stirrer is a metal blade which slowly turns around, deflecting the microwave energy in a random pattern inside the microwave oven. As the motor nears the end of its useful life it begins to make grinding noises. The microwave will not heat food evenly without this stirrer, the motor should be replaced.

Exhaust Fan Motor If the microwave is loud when running the fan motor might be

Magnetron If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.
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Magnetron If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.
Exhaust Fan Motor If the microwave is loud when running the fan motor might be
Stirrer Motor If the microwave is loud or noisy the stirrer motor might be worn out. The stirrer is a metal blade which slowly turns around, deflecting the microwave energy in a random pattern inside the microwave oven. As the motor nears the end of its useful life it begins to make grinding noises. The microwave will not heat food evenly without this stirrer, the motor should be replaced.
Turntable Motor If the microwave is loud or noisy the turntable motor might be worn out. This is a common problem and relatively easy to replace.
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Hi

Thanks for using FixYa. You can click on the link to download the user manual for your Microwave:


GE JVM1640bb User Manual


Please rate the solution if the issue is resolved or post a comment for further assistance.

Thanks
Rylee

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