Question about GE JVM1790 Convection / Microwave Oven

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Diffrence bwetween ac in volts and dc

Wot is the diffrence between ac and dc

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DC is direct current and AC is alternating current.

eg; 12 volts DC stays 12 volts constantly, positive or negative.

12 volts AC (at 60 Hertz or cycles per second) alternates from positive to negative then back to positive voltage again 60 times per second.

Posted on Sep 12, 2009

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My LG microwave oven not working.


not to b messed with even unpluged capasator holds 10.000 volts dc if it discharges onto u it can kill b carefull

May 03, 2015 | LG Microwave Ovens

1 Answer

Hot plate just wont turn on...switches checked in meter box and no iscolating switch. baumatic ceramic cook top. BA 13.2 ( i think) house just been sold. Hotplate wked thurs. House sold Fri. new owner...


Hello, is this a two electrical filament hot plate? Also, is this range stove/oven? I'm a little confused here on what exactly what you are referring to hot plate or cook stove with electrical burners and oven. If it a really old hot plate with one burner look at the plug there could be a fuse in it. If it is electrical range then check the control board and see they a fuse on. If not, check the voltage with a volt meter. Be very careful here there two phase that is 240 Volts AC. The voltage will be split between the two l20 hot legs AC which is 120 degrees out of phase in respect to each other; in other words, don't both of them don't let them touch each other.


If it a kitchen stove I'm fairly sure that the control board is shot and with this not operating it will not open the current/voltage relays for the electrical burners. REMEMBER YOU ARE DEALING WITH 240 VOLT AC...BE CAREFUL.... GB....stewbison

Aug 26, 2011 | Baumatic Microwave Ovens

1 Answer

My country use the 220 volts system do have to use a step down transformer of plug it in direct.it has been a year i have not used the appliance having no information on wattage


If your microwave is wired for 220 volts AC and your country standard house current is 220, and the plug is of the proper configuration, plug it in.

Standard microwave size is around 1100 watts at 110 volts Normally, two times the voltage is 1/2 the wattage. Ohms law, Voltares Law and Watts Law apply.

If your microwave is 1100 watts at 110 volts --- yes you will need a step- down transformer of some type.

Jul 12, 2011 | Emerson MW8102SS 1100 Watts Microwave Oven

1 Answer

Roommate steamed up the spacemaker by hard boiling pot of soup without running the fan. Then microwaved a cup of coffee while the steamed condition was still present. An arc sparked from the vent above...


Sounds like a problem in the high voltage side. Need to check the diode and if good the voltage at the magnetron. Should be 3.5 volts across mag and 4500 dc volts at mag. If you do not have a meter to check replace both mag and diode aprox $150.00 from GE. Pat

Dec 03, 2010 | GE Microwave Ovens

2 Answers

The lights, fan clock etc. all are working, but it won't heat.


The door interlock switch is probably failed or out of adjustment. Beyond that the magnetron may have failed. Does the turntable etc all and light run while TRYING to heat? If so the magnetron or possibly the relay that sends power to the transformer or the rectifier may have failed. Note that about 5000 volts is sent to the magnetron so use great caution when working on this.

Jun 09, 2010 | Frigidaire GLMV168K Microwave Oven

2 Answers

I am planning to replace my 240 volt microwave oven with an 120 volt. Can I use a converter?


You might be able to use a 120v to 240v inverter, but may still get problems as the inverter doesn't alter the mains frequency. In the UK and Europe, our 240v / 200v are supplied at a nominal 50Hz. Most 120v systems use 60Hz.

For many devices this doesn't matter, but a microwave oven uses an internal inverter to boost the incoming voltage to the much higher one needed to operate the cavity magnetron: the bit which makes the microwaves. Although it actually runs on dc power, the ac to dc conversion does not produce a smooth dc output,. Since the magnetron relies on an oscillation process to produce microwaves, the wrong oscillation can result in weak or no microwave power, or it can cause the element to overheat and fail.

In simple terms, it will work or it won't. If it doesn't it may blow the most expensive single internal component which usually renders the microwave economically unrepairable. If it does, it may underperform or gradually stress the magnetron causing premature failure. Considering the cost of a suitable inverter and the risks to the oven, it makes more sense just to buy an oven of the correct voltage to start with. New ones cost peanuts these days and used ones are often offered free on FreeCycle or Freegle, usually just needing a good clean before being re-used.

Mar 12, 2010 | GE Advantium SCA2000B Microwave Oven

1 Answer

How is the capacitor connected to the magnetron, the diode and the trasnformer in a Maytag microwave - MMV5156AA


The magnetron is a tube with a heater/cathode element in the middle of a series of scallop-like grooves that surround the cathode, but spaced away from the cathode. A small, insulated wire protrudes into one of the scallops and extracts the microwave energy that passes down the wave-guide, past a fan-like device called a stirrer that scatters the energy just before entering the cooking cavity.The magnetron requires a low voltage/high current AC heater supply plus a 3000 to 5000 volt DC supply that is hooked to the cathode of the magnetron. The transformer supplies both voltages as AC waveforms. The diode makes the HV AC supply into HV DC by passing current in one direction only and the capacitor stores/smooths that HV DC into relatively stable DC for connection to the cathode of the magnetron. The other side of the DC supply is tied to case ground as is the outer case of the magnetron. This arrangement is typical of all microwave ovens (and radars).

Oct 29, 2009 | Maytag MMV5156AAS Microwave Oven

1 Answer

Work out how long my battery will last using a


Your said your battery is rated for 85 amps / hour. This means 1 hour at 85 amps, 42 hours at 2 amps, 85 hours at 1 amp or any number of hours in between determined by 85 divided by the number of amps of the load connected. The microwave uses 600 watts. Since we can't reliably determine amps in an AC circuit - I can get close using the DC calculation. I'll assume 120 Volts at 600 watts for the microwave. Watts = Volts multiplied by Amps, so the microwave uses about 5 amps (120 x 5 = 600). HOWEVER, this is not an accurate way to determine AC amps when voltage and watts are known. I'll bet the microwave has the actual amount of amps (along with the model, voltage, wattage etc.) on a label on the back, side or inside the door. This is the information that is accurate. Use the amp rating provided on the name plate to determine how long the batter will last. Assume 8.5 amps is the value provided on the name plate.. 85 amp hour (85 AH) battery would supply an 8.5 amp (8.5 A) load for 10 hours because: 85 AH divided by 8.5 A = 10 H. The quality of the battery, and the losses contributed by the inverter will reduce the actual amount of time that the battery could supply the microwave.

I hope this helps!

Sep 18, 2009 | Panasonic Microwave Ovens

1 Answer

Replacing Microwave turntable motor


if they are physically alike use it,the units are both120 volt units,you cant operate a 210 volt motor on 120 volts w/o an inverter furthermore it would be 220 volts for that type of motor,its just a production run #

Aug 25, 2009 | Microwave Ovens

1 Answer

HV diode producing resistance of 10 ohms.


you cannot check a microwave diode with just a mutli meter . you have to make a test jig take a 9 volt battery and a meter with dc volt scale set up the meter just like you would test a 9v battery .with me so far ? now remove one lead from the battery and insert the diode between the battery and the test lead .......take a reading . now reverse the diode take a reading ........ i just tested a diode before writeing this and this is what i got my battey volts where 9.2 v whith the diode inserted i got 7volts . reversing it i got .02 volts dc . a diode is a one way valve and mine is good because it passed curent only one way ...yours should be about the same ....... if you understand this please leave me 4 stars ! i even went out in the shop and tested a diode for you just to make sure my answer was correct

Mar 07, 2009 | GE JVM1440 Microwave Oven

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