Question about Viking VMOR205SS Microwave Oven

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Viking vmor205 has dead short between hot and neutral,put ohm meter on hot and neutral leads and disconneced all the loads one at a time and still couldn't locate the short.could it be the noise filter board.

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You say "dead short"? That would zero or virtually zero ohms.

The normal reading at the power cord would be anywhere from about 80 to 250 ohms on that oven.

If it is zero, I would suspect the varistor has shorted due to a surge.

Viking microwave ovens are made by Sharp and the VMOR205 is essentially a rebranded Sharp R-1874.

The service manual for the R-1874 will be helpful and it's located at our site here.

Feel free to contact me directly (and please include your full model number from the tag in or on the unit) for more help or to get a varistor.

William E. Miller

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

Posted on May 28, 2010

Testimonial: "Clicked on your link to check out the service manual and it didn't work.thanks for the lead on the varister Curtis"


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It comes on turns but it doesnt get hot

make this test and fix it. use the multimeter. God bless you
  1. Check the power diode This electronic component is responsible for transmitting current in one direction. If the diode becomes defective it will cause your microwave to not heat. Test the diode and replace it if necessary.
  2. High voltage capacitor Responsible for storing electricity, this part is a key component in any microwave. Remove, discharge, and test the capacitor to determine if it requires replacement.
  3. Damaged magnetron Responsible for generating waves and producing heat. When your microwave is no longer heating properly, replacement will be required.
  4. Thermal Cutoffs Examine the thermal cutoffs on both the magnetron and the oven itself. Take off one of the leads and using a volt-ohm meter on RX1, check the terminals. If you get a result other than zero, replace the thermal cutoffs.

Nov 22, 2013 | Goldstar Gold Star Er710m 1.35 Cu Ft...

1 Answer

After not using it for a while the unit was dead. plugged in and it would tell you to set the time. It would not let you set it and the machine would not work.

follow this steps for troubleshooting and fix it. God bless you

  1. Inspect the power cordUnplug the power cord and check for voltage at the outlet. Also inspect for damage, shorts, or burn marks that can be a possible safety hazard.
  2. Bad door switchIf your microwave does not work at all and you know everything is plugged in properly and the outlet is functioning, then also check the door hooks and the door release button. Using a volt-ohm meter on RX1, check your terminals. When your microwave door is closed you should have a reading of zero. Once the door is open the reading should change to infinity. If these readings do not match up, replacement of the door switch is necessary.
  3. Blown fusesTo determine if your fuse has blown out, which may attribute to your microwave not running, you need to pull the fuse out using a pair of fuse pullers. Lay it down and using a volt-ohm meter on RX1, check both ends of the fuse in question. If you do not get a reading of zero, then you will need to replace the fuse.
  4. Bad fan motorLocate the fan and remove the leads. Again using the volt-ohm meter on RX1, check the terminals. If an infinity reading is displayed, it means that the fan has gone bad and requires replacement.

Read more:

Sep 30, 2013 | Microwave Ovens

2 Answers

Blown fuses

Well you certainly have done a lot of work on a microwave that is not worth the effort. When fuses blow and destroy other items ,it is time to junk it and up date. I have found that when something like what happens 9 times out of 10 it will be the magnetron or transformer either of which will be more than 1/2 the cost of a new machine.

May 18, 2013 | Microwave Ovens

1 Answer

How to test H.V. Capacitor

You need a high rated ohm meter, with leads on resistance should go way down then come up, reverse leads and same should happen again. cap is either open or not or if a short bad also.

Nov 05, 2012 | Microwave Ovens

1 Answer

Replaced the fuse and it immediately blows. My wife cooked several large potatoes got it ral hot before failure

see the steps and eliminate short circuit use the common sense: God bless you
No Lights or Power, Unit seems Dead First check is the main fuse of the unit. On countertop units, you will need to take the shell off. The fuse will be close to where the cord comes through into the unit. OTR units, this main fuse is usually behind the control panel or possibly behind the vent. Usually the fuse is obvious if blown, otherwise test with an OHM meter, if open, replace fuse.
Some brands will also have a thermal cut-off fuse in the incoming voltage line to the control board. Older Maytags and Samsungs have this fuse in it. This thermostat looking fuse is usually above the oven cavity somewhere under the outside shell. Sometimes you can get to it through the vent of OTR models. Test with an OHM meter, replace if open.

However if after replace the fuse the problem remain, you must test: a) power cord for short b) outlet wall for ground improperly c) HV transformer faulty d) Rectifier HV faulty e) Magnetron faulty. d) power supply faulty replace or repair filter diode, resistor. etc Or call some experimented service tech for troubleshooting.


Jul 27, 2012 | Sharp R-820B Convection/Microwave Oven

1 Answer

Are viking vmor205 and sharp parts interchangeable

Most of the internal electrical parts would be, but not the external parts.

In fact, many internal parts will have the Sharp part number on them.

Some examples of a Sharp part number format: RV-MZA302WRE0, RTRN-B070MRE0, etc.

Notice differences between ohs and zeros.

Most of the differences are cosmetic.

The VMOR205 is equivalent to the Sharp R-1874, whose manual is at our site here.

You should also refer to the R-1855A manual here.

You can order Sharp parts from Encompass here or you can call them toll-free at 866-779-5835.

To order Viking parts, on the West Coast call 1-800-488-9868. Otherwise call 800-241-9152.

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

Oct 08, 2011 | Viking DMOR205SS Microwave Oven

1 Answer

After a power surge, our microwave makes a loud buzzing sound when on, and we also detect a slight odor of burning rubber. what happened?

Hi and welcome to FixYa, I am Kelly
The loud buzzing your hearing is the magnetron oscillator not cycling properly. This is caused most of the time by a failure of either the High Voltage Diode/Rectifier (PN: 5304467670) or the Capacitor (PN: 5304467671)
DO NOT attempt further use as costly damage can occur.

With power off / completely removed and chassis open make sure to hold a screwdriver well back on the handle and ground across the capacitor terminals 3 times. This is to ensure you do not get shocked. Since your unit is malfunctioning I doubt there will be a charge on the capacitor but you have to be safe.

Disconnect the rectifier from the capacitor and read the resistance (ohms) across the 2 terminals. Reverse the meter leads and test it again. It should read resistance in on direction only. If you read open or shorted in both directions the Rectifier is bad. ( I think this is what has failed on your unit)

The capacitor is checked by setting the Ohm Meter on an R x 10,000 scale and probing the teminals. You should see a brief jump in resistance and then the meter drifts to infinity each time you reverse the meter leads. No jump in resistance then the capacitor has failed.
Also read each terminal to the case of the capacitor for shorts. NO shorts allowed. Any short either terminal to ground is cause for replacement. NOTE you may have to remove on set of connecting terminals from one side of the capacitor to get a good reading. Aftoer isolating the capacitor you still have readings to ground or no jump in resistance when the leads are reversed the Capacitor has failed.

The replacement parts are items 1 and 2 of this link:

Thanks for choosing FixYa,

Jul 22, 2011 | Frigidaire FPMV189KF Microwave Ovens

1 Answer

Monitor fuse blows when unit is turned on. I tested the door sensing switch,secondary interlock switch and the monitor switch all tested o.k. is there something else that could blow this fuse?

You probably have a shorted High Voltage Capacitor. Be sure to short across the terminals before you put your ohm meter leads to it....... obviously, if it's shorted problem........

Apr 13, 2009 | Sharp R-1850A Convection/Microwave Oven

1 Answer

Blows main fuse 20A,250V when press start microwave.

First things first, check the big cigarette can type capacitor. OHm it out should not be shorted, meaning reads zero ohms. use ohm meter, set to ohms, put leads across 2 terminals (after your short them with a screwdriver)should not read zero..

next replace magnetron, it's easy, call appliance repair for price if it makes sense and your a gambler replace it.

Mar 06, 2009 | Microwave Ovens

1 Answer


Make sure unit is not plugged in. Use a Volt-Ohm Meter, on Ohms setting, and see if you have connection to the fuse holder. Put one meter lead on the BLACK ac wire, test the ac plug with the other lead (both sides) One should read. Do the same with the WHITE ac wire. One should read.If you get readings on both sides then AC Cord is good. Next check the fuse holder for signs of heat or dis-coloration. If found replace fuse holder. Always remember just because a fuse looks good does not mean it is good, and also I have replaced a fuse with a NEW bad fuse. It happens. To be sure test with meter.

Jan 16, 2008 | LG LMV1650ST Microwave Oven

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