Question about GE Spacemaker JVM1540 Microwave Oven

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I have just got this microwave.. and it runs quietly and smooth.. but will not heat food or water. I exchanged the fuse and the big silver capacitor that was in my old microwave that was working, ( they were the same size) and it still wont cook

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There are three or four door switches that rely on catches to make them make or break contact. Are the switch actuators on the side of the door still OK? If they are then the magnetron is not coming on and may need replacing.
Hope this helps.

Posted on Oct 16, 2010

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Posted on Jan 02, 2017

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Bosch microwave oven,turntable not working,food not heated


Even if the turntable isn't turning, the oven should still heat the food but it will be uneven cooking. I would suggest that the unit is not "microwaving" This is usually the high voltage capacitor, fuse or diode failure. You will need knowledge of how microwave ovens work and specialist tools to test these. If you don't, I would suggest you get a tech who does. There are extremely high voltages in microwave ovens.

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My microwave with hot heat the food


Could be a lot of things... If it's quiet when you try to zap something, then suspect a blown fuse inside or a burnt wire or the relay board. If it's extremely noisy when you try to zap something, then suspect the Mag tube, HV diode, or HV capacitor. Also, the windings on your HV transformer could be burnt, but that's not as common as the above mentioned items.

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Maytag 4205baw runs but does not heat any items


Step 1:

Follow this steps and see the diagrams.God bless you

1)Diode




The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven. A regular meter with a diode checker will not work to check these diodes. You have to use a meter with a 9 volt battery or put a 9 volt battery in series with the diode to check it.

Door Switch




If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron




If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.



High Voltage Capacitor




If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testin

High Voltage Transformer




If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food. When a high voltage transformer fails it will usually arch and have a burning smell

Thermal Fuse




If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Thermoprotector




If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Step 2:

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Step 3:

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Feb 06, 2013 | Microwave Ovens

1 Answer

Does not heat food


Could be one of a few things. if everything works but no heating of food.there is a fuse from the magnetron transformer to the big capacitor check if it is blown. If everything works but the sound is just different ,almost lower in pitch check the diode from the capacitor to the metal casing ,, it \normally goes short circuit.Then if all is good, very likely to be your magnetron. Magnetons are expensive .

Jun 05, 2011 | Emerson MW8987B/W Microwave Oven

1 Answer

Micro wave seems to run when started, but wont heat food/water


HI. Your symptoms are a strong indication Magnetron failure. This is the principal heating device, that is used to produce microwaves that , essentially, excite the water molecules in the food, thus, producing the heating effect. When this device fails, generally, the unit will run, but not heat. This device is very fragile, and can injure you if you are not qualified to handle this type of component. There is a High Voltage Capacitor, that is used to help provide the necessary current for optimal Magnetron operation. This capacitor must be discharged correctly. If not, you could risk serious injury, during the repair, if it is accidental touched.

The Magnetron is linked to a cut-off fuse. If the magnetron becomes unstable, this fuse will shut the device down. It is standard procedure to have this fuse test for continuity. If the fuse has blown, this will be the culprit. Replace the fuse. Now, if the fuse continues to show continuity, this will confirm that the Magnetron has failed. I would advise to inspect the Capacitor, and HV diode for visible burn marks, or swollen top(Cap).

Access can be ac hived to these parts by removing the outside cabinet screws. Once the screws are removed, the cover can be removed, as well. Once the cover is removed, the internal components will be exposed for testing, and visual inspections.

WARNING: IF YOU ARE NOT A QUALIFIED SERVICE TECH, THIS WILL NOT BE A NOVICE DO IT YOURSELF JOB. MICROWAVES ARE VERY DANGEROUS, AND CAN CAUSE SERIOUS INJURY. I RECOMMEND TO CALL FOR SERVICE, IF YOU ARE UNCOMFORTABLE WITH HANDLING THE CAPACITOR, OR MAGNETRON.....

Feb 09, 2011 | Kenmore 63292 / 63299 1200 Watts Microwave...

1 Answer

The microwave is running with a big noise and can not heat food


The magnetron "heats food" has probably failed and is loading down the high voltage transformer making it labor as it runs, also the high voltage diode and capacitor must checked since they are part of the high voltage system. This not be cost effective to repair.

Feb 01, 2011 | Sharp R-630D Microwave Oven

1 Answer

Microwave function isn't working, it turns on and runs, but food doesn't heat up, how can I fix?


HI. Your symptoms are a strong indication of Magnetron failure. This is the principal heating device, that is used to produce microwaves that , essentially, excite the water molecules in the food, thus, producing the heating effect. When this device fails, generally, the unit will run, but not heat. This device is very fragile, and can injure you if you are not qualified to handle this type of component. There is a High Voltage Capacitor, that is used to help provide the necessary current for optimal Magnetron operation. This capacitor must be discharged correctly. If not, you could risk serious injury, during the repair, if it is accidental touched.

The Magnetron is linked to a cut-off fuse. If the magnetron becomes unstable, this fuse will shut the device down. It is standard procedure to have this fuse test for continuity. If the fuse has blown, this will be the culprit. Replace the fuse. Now, if the fuse continues to show continuity, this will confirm that the Magnetron has failed. I would advise to inspect the Capacitor, and HV diode for visible burn marks, or swollen top(Cap).

Access can be ac hived to these parts by removing the outside cabinet screws. Once the screws are removed, the cover can be removed, as well. Once the cover is removed, the internal components will be exposed for testing, and visual inspections.

WARNING: IF YOU ARE NOT A QUALIFIED SERVICE TECH, THIS WILL NOT BE A NOVICE DO IT YOURSELF JOB. MICROWAVES ARE VERY DANGEROUS, AND CAN CAUSE SERIOUS INJURY. I RECOMMEND TO CALL FOR SERVICE, IF YOU ARE UNCOMFORTABLE WITH HANDLING THE CAPACITOR, OR MAGNETRON.

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1 Answer

JVM1640BB everything appears to operate but it does not heat the food.


HI. Your symptoms are a strong indication Magnetron failure. This is the principal heating device, that is used to produce microwaves that , essentially, excite the water molecules in the food, thus, producing the heating effect. When this device fails, generally, the unit will run, but not heat. This device is very fragile, and can injure you if you are not qualified to handle this type of component. There is a High Voltage Capacitor, that is used to help provide the necessary current for optimal Magnetron operation. This capacitor must be discharged correctly. If not, you could risk serious injury, during the repair, if it is accidental touched.

The Magnetron is linked to a cut-off fuse. If the magnetron becomes unstable, this fuse will shut the device down. It is standard procedure to have this fuse test for continuity. If the fuse has blown, this will be the culprit. Replace the fuse. Now, if the fuse continues to show continuity, this will confirm that the Magnetron has failed. I would advise to inspect the Capacitor, and HV diode for visible burn marks, or swollen top(Cap).

Access can be ac hived to these parts by removing the outside cabinet screws. Once the screws are removed, the cover can be removed, as well. Once the cover is removed, the internal components will be exposed for testing, and visual inspections.

WARNING: IF YOU ARE NOT A QUALIFIED SERVICE TECH, THIS WILL NOT BE A NOVICE DO IT YOURSELF JOB. MICROWAVES ARE VERY DANGEROUS, AND CAN CAUSE SERIOUS INJURY. I RECOMMEND TO CALL FOR SERVICE, IF YOU ARE UNCOMFORTABLE WITH HANDLING THE CAPACITOR, OR MAGNETRON.

Dec 26, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Mircowave not heating


HI. Your symptoms are a strong indication Magnetron failure. This is the principal heating device, that is used to produce microwaves that , essentially, excite the water molecules in the food, thus, producing the heating effect. When this device fails, generally, the unit will run, but not heat. This device is very fragile, and can injure you if you are not qualified to handle this type of component. There is a High Voltage Capacitor, that is used to help provide the necessary current for optimal Magnetron operation. This capacitor must be discharged correctly. If not, you could risk serious injury, during the repair, if it is accidental touched.

The Magnetron is linked to a cut-off fuse. If the magnetron becomes unstable, this fuse will shut the device down. It is standard procedure to have this fuse test for continuity. If the fuse has blown, this will be the culprit. Replace the fuse. Now, if the fuse continues to show continuity, this will confirm that the Magnetron has failed. I would advise to inspect the Capacitor, and HV diode for visible burn marks, or swollen top(Cap).

Access can be ac hived to these parts by removing the outside cabinet screws. Once the screws are removed, the cover can be removed, as well. Once the cover is removed, the internal components will be exposed for testing, and visual inspections.

WARNING: IF YOU ARE NOT A QUALIFIED SERVICE TECH, THIS WILL NOT BE A NOVICE DO IT YOURSELF JOB. MICROWAVES ARE VERY DANGEROUS, AND CAN CAUSE SERIOUS INJURY. I RECOMMEND TO CALL FOR SERVICE, IF YOU ARE UNCOMFORTABLE WITH HANDLING THE CAPACITOR, OR MAGNETRON.

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1 Answer

Fuse


after blowing the fuse?..what happened next?...did you replaced the fuse and it start running again or if you replaced the fuse, it will blow again?

if it is always blowing the fuse, you may have a shorted diode in between the high voltage capacitor. you could remove that just to test if the fuse would no longer blow and if it would heat.

if it did not blow anymore and it did heat the ffod or water, then you all need to raplace that diode between the high voltage capacitor.

if the fuse did not blow anymore and it is still not heating the food , then you might have a faulty magnetron.

if it still blow your fuse then you could have a shorted magnetron, a shorted diode which is the one from the capacitor to the ground( this is anothere diode besides the one installed between the terminals of the high voltage capacitor) ( don't interchange them, they have different puposes..) or shorted capacitor also.

use a regular ohmeter to test each part...

i hope you can solve your problem with these instructions....

good luck,

drcool

Aug 02, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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