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Does it make a difference if the F and FA wires get connected in the reverse direction when wiring the Magnetron? if so what does it do to the system?

Posted by Tammy McCollum on

1 Answer

David Emmel

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  • 295 Answers

See www.repairclinic.com for the wiring diagram, schematics, teardown,parts,etc

Posted on Jun 20, 2019

5 Related Answers

MicrowaveSvc

William Miller

  • 9179 Answers

SOURCE: Which type of wire I should use to connect capacitor to magnetron

You were sent the wrong magnetron.

If the supplier will not give you the proper one, you can usually find helpful exploded view diagrams and order proper parts by entering your full model number here.

If you don't find it there, please reply back with your brand and model number so we can help you.

You would need high voltage wire, of course, but I would not recommend using the wrong magnetron in your oven since it is a critically tuned part, and will likely fail in short order if it is not the correct one.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Dec 28, 2008

MicrowaveSvc

William Miller

  • 9179 Answers

SOURCE: Wires to magnetron

It matters!

The wire from the high voltage transformer high voltage tap goes only to one side of the high voltage capacitor. No other wire is connected to that terminal of the high voltage capacitor.

The other side of the high voltage capacitor connects to the anode (A) of the high voltage diode and to the "FA" terminal of the magnetron.

The cathode (K) of the high voltage diode is connected to chassis ground.

The pair of wires connected to the secondary (thinner) winding of the high voltage transformer are the filament wires and are connected to the "F" and "FA" terminals of the magnetron.

427ca4f.jpg

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

It has the overall wiring diagram and schematic.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

For further free help, e-mail me at http://www.microwavecontrol.com

Posted on Jul 13, 2009

MicrowaveSvc

William Miller

  • 9179 Answers

SOURCE: GE Spacemaker diode connection

A good high voltage diode will read open in both directions on a standard meter. See: http://www.gallawa.com/microtech/diode.html

If the diode is NOT shorted or burned looking, it's probably fine.


There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, & testing.

dee77f7.jpg

It has a wiring diagram and a schematic which shows you how the components are connected.

On one terminal of the high capacitor, there is only one connection - to the high voltage output of the high voltage transformer.

The other terminal of the capacitor will be connected to the high voltage diode and the magnetron, as well as one of the heater (cathode) windings of the high voltage transformer.

Here is info on testing the mag:

http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though mag is bad!)


You can find links to helpful exploded view diagrams and part ordering help here.

I'd recommend that your bookmark this link to your favorites.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Dec 07, 2009

SOURCE: Magnetron Ready to be Reinstalled but...

The sensor you detail has no polarity. It can go "either way"
For goodness sake be careful, I don't want to scare you but more servicemen, & would-be-servicemen die each year "trying" to service Microwave ovens. They are lethel, or rather the Main Capacitor is, it stores enough Joules to kill someone 10 times over.. Always ensure it is discharged to earth before working on anything.
Be careful.

Posted on Jan 21, 2010

Gil Shultz

  • 3464 Answers

SOURCE: I have a sharp p-651zs microwave and it does not work I opened the back and found a small switch type thing on top of of the magnetron with two wires ,it is not conected to the magnetron. Can you t

That is probably a thermal safety. Be glad it did not turn on with the covers removed you can cook your self very quickly unless you are trained in servicing them.

Posted on Dec 06, 2014

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I am replacing a magnetron in a Whirlpool gm8155XJB-0 microwave. The schematic does not differentiate between the F and FA terminal connections. It only shows the filament connections without labels. The...

Poring over a few schematics, I see them connected both ways.

One one hand, microwave technology guru J. Carlton Gallawa says that it matters to achieve proper phasing (http://www.microtechfactoryservice.com/Ch7Pg6.html), but he does not explain what the abbreviations mean or what the standard is for connecting them!

I'm an electronics engineering technician and microwave servicer with over 30 years of experience, and it seems pretty obvious to me that "F" would stand for "filament" and "FA" stands for "filament, anode."

So I would connect to the "F" terminal the transformer filament lead which has nothing else attached to it.

I would attach to the "FA" terminal the other filament lead, which is also attached to the downstream side of the high voltage capacitor and to the "anode" of the high voltage rectifier diode.

-del-wqmxc4x24vcwcbxsryr2s4io-4-0.jpg
William E. Miller, AS-EET
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"
3helpful
1answer

I have a Natioanl NN-6207 Microwave,I have replaced the magnetron and the fuse, every time I switch the microwave on it makes a loud humming noise and blows the fuse. The magnetron has two terminals F and...

F and Fa could be the problem but.... You must check the power diode and the high voltage capacitor. One of these is most likely the reason the fuse failed in the first place. Ground the HV capacitor by holding an insulated screwdriver well back on the handle. The locate the Power Diode that will have at least ONE terminal that connects to the capacitor. Power doides are either 3'8 inch wide and 2 inches long or round an liik like a bit resistor with no color markings. ' Check the HV capacitor by rading each terminal to the case of the capacitor (no shorts allowed)
Then read across the capacitor terminals with the meter set on R x 10K. Watch for an initital jump in resistance and then it drifts up to infinity. Reverse test lead positions and you must get the same result. Resistance and then drift to infinity. Any other reading.... infinity in both directions, short to the case or short across the 2 terminals = bad Cap.
If after you perform the above tests and you still have the problem ... knowing you might pop another fuse there are 3 door switches. 2 of them will read resistance / continuity across the terminals when the door is close and one of them will read continuity across the terminals when the door is open. One of the 3 switches has 3 wires on it... the 3rd wire shorts the magnetron power when the door is open and the power relay / HV circuit is powered. This is a built in blow the fuse to prevent magnetron operation with the door open.

I think your are going to find that either the power diode or the HV Capacitor has failed.

Thanks for choosing FixYa,
Kelly
0helpful
1answer
1helpful
2answers

Hi, my microwave is not heating and i cannot hear any humming sounds either. I replace a new magnetron already and it's the same. What else could it be? do you think I should replace the capacitor, diode...

I would have started with the diode and capacitor (i.e the least expense) but you can check the diode by removing the input wire and doing a continuity check in BOTH directions. In other words check it then reverse the leads and check it again. It should only read in ONE direction. If it reads continuity in both directions or is open in both directions it is bad and must be replaced. If the diode check out fine then by all means check the capacitor. Just respect the fact it is a large capacitor and can really ruin your day if it is good and has a full charge. (Been there done that!) Take a screwdriver and ground across the terminals several times then note the position of the wires on the capacitor and remove the wires from ONE terminal set. Take your meter still on Ohms ( old simpson type dial meter for this test) and place it on the capacitors 2 terminals. Then rapidly reverse the leads and you should see a momentary jump on the meter then fall off. No jump when you repeatedly reverse the leads then the capacitor is bad. This should solve your problem unless there is a relay on the control board that controls the magnetron power.
13helpful
1answer

Wires to magnetron

It matters!

The wire from the high voltage transformer high voltage tap goes only to one side of the high voltage capacitor. No other wire is connected to that terminal of the high voltage capacitor.

The other side of the high voltage capacitor connects to the anode (A) of the high voltage diode and to the "FA" terminal of the magnetron.

The cathode (K) of the high voltage diode is connected to chassis ground.

The pair of wires connected to the secondary (thinner) winding of the high voltage transformer are the filament wires and are connected to the "F" and "FA" terminals of the magnetron.

427ca4f.jpg

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

It has the overall wiring diagram and schematic.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

For further free help, e-mail me at http://www.microwavecontrol.com
0helpful
1answer

Panasonic 1250 Watt genius microwave- will not cook. message refer to operators manual before use. Have owned for several years, has run afew times after unplugging for a few minutes, then nothing. clock,...

 Confirm 110-120 volts AC is entering the primary coil on the high voltage transformer....meter works but can be fooled, I usually rig up a light socket and household light bulb and hook that to the 2 input wires for the transformer and see if the light works or not when you run the microwave....can even set a power level and watch the light go on and off. Discharge the capacitor first before attempting any checks or tests.


Scary but works!....

If ok, put those 2 wires back on the transformer. Discharge the capacitor .
Remove the 2 wires going to the magnetron....run the microwave a few seconds ( 2-3 ) and remove power....again discharge the high voltage capacitor . If you got a good crack&spark when you discharge the cap the second time you are creating high voltage but not using it ( bad magnetron or loose High Voltage wire somewhere )....if you get no crack&spark you are not creating high voltage.

 
How to check a common high voltage diode - click here. Check the diode with one end off/disconnected....should show continuity one way, reverse your meter leads and none the other way.....many meters are not high/good enough and often show no continuity ( infinity ) in both directions. A full continuity reading in both directions  (0 ohms) on the diode may be shorted/bad one!
Many  microwaves however have a defect in the microwave distribution system which causes the magnetron tube to overheat and cut out and/or damage the diode. 
0helpful
1answer

Whirlpool mh7140xfq

Here are some links you can use for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/cap_test.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

The average DMM doesn't have a high enough voltage to bias a high voltage diode, which is several diodes is series.

If the diode was not shorted, it was probably okay. They almost always short when they go bad.

I don't advise people on measuring a microwave's high voltage. The voltages can be instantly lethal.

The tech sheet should show you how to measure the resistance of the windings of the high voltage transformer. You know you're getting 120V on the primary.

The capacitor is probably okay because they usually short when they fail, and that would blow the fuse when you hit Start.

Look for corrosion or signs of melting on the FA terminal of the magnetron (and on the other temrinal if someone reversed the wires). Look fro a loose connection at the magnetron.

If these connections are fine, then you probably have a bad magnetron.

Probably the best prices on Whirlpool parts can be had here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
3helpful
2answers

Kenwood CJ/AL28 microwave does not heat the food anymore...any reason why?

Check the high voltage fuse between the transformer and the capacitor, had the same problem with mineand this fixed it. Not an ordinary fuse though (5Kv 0.8a), cost me about a fiver.
0helpful
2answers

Need install schematics for magnetron tube for ge jvm1440ba

You can download GE owner's manuals and installation instructions here.

We're happy to help you and we'd appreciate your thoughtful rating of our answer.
0helpful
1answer

Electrolux microwave model number E305075FPSA

There will be one wire that will go to two and only two points: From the high voltage tap on the high voltage transformer to one terminal of the capacitor. There will be nothing else connected at either point of that wire.

The other terminal of the capacitor will have two or three wires connected to it. It will go to the FA terminal of the magnetron and to the non-ground side of the high voltage rectifier diode.

ff8823d.jpg

If you need further assistance, please feel free to contact me directly through the links at our site: http://tinyurl.com/yzjozk

We're happy to help and we appreciate your thoughtful rating of our answer.
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