Question about Microwave Ovens

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This is a microwave oven capacitor diagram for my

This is a microwave oven capacitor diagram for my oven As u can see two diod to the capacitor which polarity is oposit to each other I am just confused. Why are they there and what they doing with the electrons

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If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Posted on Dec 13, 2014

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SOURCE: I have kenmore microwave model 721.80012401 it does not heat, I checked the magnetron thermostat, capacitor and the only thing that does not check out is the diode,can the diode cause this problem?

yes your diode can keep it from heating but it usually makes a loud growling if diode is bad. there is also another thermal disc on the other side of the oven that could be open. usually can see it in a hole in the plastic with 2 wires. if there is continuity on both this and the mag thermal, you may have a bad magnetron

Posted on Feb 12, 2012

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Microwave run but won't get hot


If your microwave oven doesn't heat, you may have a problem with the high voltage diode or rectifier. This component helps provide the high voltage that powers the magnetron. The high voltage diode is located near the magnetron and the high voltage capacitor, so access will require removal of the cabinet. Disconnect the power and also discharge the high voltage capacitor to prevent an electrical shock. You can then test the diode for continuity with a multi-meter. Diodes are polarity specific and you should see low resistance with the meter leads in one direction and higher resistance when the meter leads are reversed. Most multi-meters will have a special setting for diodes or rectifiers. If the high voltage diode shows low resistance in both directions or shows no continuity at all, then it will need to be replaced. If you find the high voltage diode tests okay, then you will need to determine whether power is being supplied to the circuit. This is a high voltage circuit and further testing should only be performed by a qualified technician.

Jan 06, 2018 | Microwave Ovens

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How to replace a microwave oven's diode:


Replacing a high voltage diode<br /><br />The first thing you must do to replace your microwave's diode is unplug the unit from the wall outlet.<br /><br />Next you will have to discharge the high voltage capacitor. A capacitor stores large amounts of electricity even when the unit is unplugged. It is necessary to discharge the high voltage capacitor in order to avoid receiving an electrical shock.<br /><br />Diode replacement is relatively straightforward because most high voltage diodes have a press fit, also known as Fast-On, or they have ring lugs. If your replacement diode can be installed either way, make sure you get the right polarity. Remember that a diode will conduct an electrical current when a forward voltage is applied, but when a reverse voltage is applied, there is no conduction.<br /><br />Remove the diode from your microwave and replace it with the new one. You may be able to crimp the new diode onto the wire leads, without welding or soldering them together. If you do crimp the diode onto the leads, be sure not to apply too much pressure, as this may cause connection problems either now or in the future. <br /><br />I hope this is helpful.<br />

on Dec 02, 2010 | Microwave Ovens

1 Answer

Sharp carouse ii microwave makes a stress noise and not heating


Your high voltage power diode has most likely failed. That or the magnetron itself has failed where as the oscillator is stuck. My bet is the power diode is what has failed.


(UNIT UNPLUGGED)
First off short out the capacitor AFTER removing the outer chassis with a screwdriver. Hold the screwdriver back on the handle and short across the 2 capacitor terminals. Locate the power diode that will be the wire that is metal. Remove it from the capacitor. Use a meter and read continuity of the diode. Reverse the test leads and read continuity again. In one polarity it is supposed to read like a wire (ZERO Ohms) and in reversed polarity it is supposed to read infinity. (Open) If you get open or short in both directions it has failed.
Diode PN is:
FH-DZB007MRY0
Sources:
http://www.partstore.com/SearchResults.aspx?q=FH-DZB007MRY0&SearchTerm=True

http://www.repairclinic.com/PartDetail/H-v-diode/FHDZB007MRY0/1913632

http://www.pacparts.com/model.cfm?CFID=1167106&CFTOKEN=86a0b11f39d05716-5BB5A182-D087-7AB9-C3CFB68FBA1B156C&mfg=SHARP&model_id=R530AK&row_start=11&src_model_id=R530&action=list_part

You can change this part and still have a problem with the magnetron... usually though a diode change brings them back to life.

One more thing to do is check the capacitor.... you probe the terminals with the meter on R x 10,000 and watch for a brief jump in resistance and then the meter drifts to infinity. Reversing the leads your looking for the same result each time you reverse the test leads. If you get this reading... the capacitor is probably good.

Thanks for choosing FixYa,
Kelly

Sep 05, 2011 | Sharp Carousel R530EST Microwave Oven

1 Answer

My GE microwave model #JVM1640WB microwave stopped heating and is making a humming noise. Everything else about it is fine. Light, keypad, turntable, all work normally. Just no heat. How do I...


Hello, installing is quite straight forward if you know what youre doing. BUT, be very careful of the voltage in the capacitor even when its off,it is lethal! When you change the magnetron it is advisable that you also change the diodes. Again make sure that the capacitor is fully discharged, by switching the microwave off, unplugging it, and discharging the capacitor with an insulated screwdriver, it will be noisy. Next unsolder the old diodes and fit the new ones(check their polarity). Replace the magnetron and when all looks good,switch it on. If it works, good, if not there could be a power supply problem. 9 times out of 10 its the magnetron. Good luck.

Mar 27, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

My Whirlpool GH4155XPS Stainless Steel Microwave Oven has stopped heating things. Lights are on, the fan noise is there, the plate spins, everything looks and sounds normal... just nothing gets hot at...


Hi and welcome to FixYa, I am Kelly.

For post reference use this parts diagram:
http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5139915&diagram_id=28260680#d28260680

Usually either the capacitor (Item 20 above) or the diode (item 19 above) causes this problem.


You POWER OFF the unit completely. CB OFF or local plug un-plugged.

- Open the chassis and you FIRST discharge the capacitor by holding a screwdriver way back on the handle and GROUND the capacitor across the 2 terminals at least 3 times. (Trust me if the capacitor is good and you do not do this your in for a really bad day)
- Disconnect one end of the power diode and then test the diode for continuity 2 times reversing the leads. It should read continuity on ONE direction / polarity only. If it reads open in both directions or short in both directions it has failed.
- Next test the capacitor by probing the terminals and again reversing the leads. On a scale of R x 1,000 or R x 10,000 (X 10 better) your looking for a momentary jump in resistance and then the meter returns to near infinity. (Just make sure all the leads are off ONE set of terminals first) Reverse the test leads and probe again. You should see the resistance jump and then fade to near infinity EACH time the leads are reversed..

These are the 2 most common reasons for the unit to run but not heat. If after testing you still have no isiolated the problem, respond with your results and we can proceed from there.

Thanks for choosing FixYa,
Kelly

Feb 24, 2011 | Whirlpool GH4155XPS Microwave Oven

1 Answer

Microwave makes a loud humming sound when turned on.


Microwave ovens have a diode stack, usually made up of HV Diodes sometimes only 1, if there is 2 one will sit between the 2 connections on the hIgh Voltage Capacitor which sits at the back usually right hand side to the right of the transformer, WARNING: before doing anything, the Oven must be unplugged and the capacitor shorted to earth, unplug one side of the diode and using a multimeter check for short, it should read virtually open circuit, if there is a problem with it it will show a low reading regardless of the polarity of the probes, there is another diode that sits between the HV Capacitor and the oven case (earth) do the same with that, if either read low, replace, then using the multimeter and test between the two connections of the HV capacitor, if reading id low, replace, then check the connections on the Magnatron to earth, not to each other, read should be open circuit any reading, it needs tro be replaced. Hope that helps...Phil

May 19, 2009 | KitchenAid Microwave Ovens

1 Answer

Lg microwave will not heat at all


Test the high voltage capacitor, the rectifier diode.or the magnetron.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

Apr 28, 2009 | LG LTM9000 Microwave Oven

1 Answer

Everything works does not heat


If the microwave operates normally, but does not heath at all, then it can be the high voltage capacitor, the rectifier diode.or the magnetron.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, your model number did not return any result, contact the seller here to purchase parts. (here in UK).If the microwave operates normally, but does not heath at all, then it can be the high voltage capacitor, the rectifier diode.or the magnetron.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, your model number did not return any result, contact the seller here to purchase parts. (here in UK).

Apr 27, 2009 | General Electric Microwave Oven

1 Answer

Amana cmax microwave


Test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

The diode and capacitors can br tested. The capacitor must be alloweddischarge before testing, or you risk to get electrocuted, even ifpower is off. Capacitors can get discharged by shorting their twocontacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts. (here in UK).

Nov 29, 2008 | Amana HDC21 Microwave Oven

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