Question about Sharp Microwave Ovens

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Sharp 953 as if not plugged in. checked fuses internally and external all ok. Power goes to control panel although tested with volt tester pen.

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Door two of the three contact switches on the door had jammed, after exercising several times all is well.
The ovens appeared to have no power as they are used in energy save mode.
If the clock had been set it would have had partial function.

Posted on Aug 19, 2008

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The control panel circuit board may need repair, and it's possible the low voltage transformer has failed.

Some do it yourself tips here.

Info on ordering Sharp UK parts / spares is here.

For local servicers, see this page.

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

Posted on Aug 19, 2008

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Panasonic Microwave NN-CT552W has no power - plug fuse ok - Has it got a thermal cut out or internal fuse? - Unit was ok after cooking some jacket potatoes


All microwaves has both internal thermal cut out and internal fuse, Yours problem sounds like an open 9 volts transformer that power up the front panel

Nov 07, 2014 | Microwave Ovens

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Why did my micro stop working?


I guess the main plug fuse does not blow for the same reason it does not blow and you can wreck a PC, although not certain why that is. I have a feeling from past work on a Panasonic that there is an internal fuse as well. This may have blown with the power surge.

Jul 07, 2014 | Panasonic Nn-sn797s Countertop Microwave...

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Sharp 953 microwave isn't heating up food.


It may be a bad door switch or door switch mount. It would not be the middle switch, rather the bottom or possibly the top one.

See: http://www.microwavedisplay.com/doorsw.txt

Info on ordering Sharp UK parts / spares is here.

If you're in another country, you can visit Sharp's world portal here.

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

Dec 12, 2009 | Sharp Microwave Ovens

2 Answers

No power to our Viking microwave vmor205ss


That oven is essentially a Sharp model R-1874 with Viking's name on it. The R-1874 is turn is a variant of the R-1855A.

We have the service manual for the R-1874 and and R-1855A have uploaded them to our site here and here to help you.

You will need the
free Acrobat Reader to view or print them in case you don't have it.

The fuse and the magnetron's temperature fuse are the two internal parts most likely to render it "dead".

You can use the Sharp part numbers for internal parts, but not for cosmetic / external / trim parts.

If the problem turns out to be the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases in about a week or so.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Dec 27, 2008 | Viking VMOR205SS Microwave Oven

1 Answer

Sharp Microwave Model R-1830: No power


A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open oven thermal cutout (TCO) on the top of the oven cavity / body or an open thermal fuse on or above the magnetron.

These should read closed (virtually zero) on a continuity check.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it went dead or when you plugged it in or opened or closed the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

You can usually find exploded views and order parts by entering your model number here at the Sears parts site but the best place to order Sharp parts is Tritronics.

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

Oct 12, 2008 | Microwave Ovens

1 Answer

My R-1870 microwave oven is completely dead. No display no response to keypad entries. No fan, No light below the oven. No light in the oven. Checked the circuit and there is 110v to the plug.


A microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

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.

You can probably find exploded views and order parts by entering your model number here at the Sears parts site.

The best place to order Sharp parts is Tritronics.

We have the full service manuals for this series of ovens and have uploaded them to our site here and here.

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

Jul 05, 2008 | Sharp Microwave Ovens

2 Answers

R-4H84 Sharp Carousel II microwave oven stoped working


A microwave can be dead for many reasons.

The fuse is normally located on the floor of the chassis behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

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

Jun 19, 2008 | Sharp R-1490 Microwave Oven

1 Answer

Sharp R-A95 no power


On these models, the fuse is usually located either between the door switches or on the floor of the chassis.

A microwave can be dead for many reasons.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.

If it has a hood thermostat, that should read open, as opposed to the others, which should read closed.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can possibly still find an exploded view by entering your FULL model number (with and without dash) here: http://www.searspartsdirect.com

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

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Apr 26, 2008 | Sharp R-7A95 Microwave Oven

1 Answer

Keypad counts down; but no cooking


j..first, I'd check the internal fuse on this unit. It sounds like it is blown. Alternatively, you might have blown a thermosensor if you don't have a fuse. Generally, they are found clamped in sheet metal attached to the side of the oven in the control area. They are usually the size of a dime in diameter and about 3/8 inch thick with two plug ins. With the power off, have a look at it using a tester. It should have continuity...if not replace it. No tester? Remove both plugs, and connect them using a paper clip and tape up. Plug in and try it. If it works...replace the sensor...never operate without one!

Dec 16, 2007 | Sharp R-426HS 1200 Watts Microwave Oven

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