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Sharp Microwave stopped working. lights up, counts down. Fine'

Door interlock repair on Sharp microwave, model J-409 JSF
The microwave oven lights up, counts down, but no cooking action. Thanks!

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  • Richard St.Clair
    Richard St.Clair May 11, 2010

    Did you repair the door switch or do you want to know how to

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  • Master
  • 4,088 Answers

High voltage power supply for the magnetron is likely problem. Multi-thousand-volt section--be careful.

Posted on Jul 12, 2009

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Posted on Jan 02, 2017

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2 Answers

My sharp microwave/convection oven come on, clock counts down but it does not heat nor does the turntable turn. About a week ago the breaker was tripped by it I think but it was fine until now. It doesn't...


Hi,

It sounds like one of the door micro switches is bad. There are three micro switches typically. A primary interlock, a secondary interlock and a monitor switch. It is most likely the primary or secondary interlock switch. You may need to take your switches to a professional appliance shop to determine which one is bad.


Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Jan 22, 2011 | Sharp R-930AK Convection/Microwave Oven

1 Answer

My sharp r-340f works for 10 seconds, then turns off, then turns on again but with the countdown timer not counting down. Moreover, no microwave radiation comes out. Thus, the food is still cold after...


The magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Nov 23, 2010 | Sharp R-340 Microwave Oven

1 Answer

We have a Sharp Carousel Microwave, model #R-508HS. The other day it just stopped working. The time works. We can set the time and it counts down the time, but it doesn't turn or cook at all.


You likely have a bad primary interlock (bottom door switch) or its mount is bad.

See this file on safety and this file on door switch diagnosis and replacement.

If needed, the service manuals are here and here.

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

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

Aug 18, 2010 | Sharp R-508HS Microwave Oven

1 Answer

Microwave will not work


Even though you don't mention the model number, you posted under Sharp model R-1491, so I'll assume that's it.

You say when trying to work the actual microwave, you get nothing?

We could use a little clarification, but FixYa only gives you one shot at posting a help request.

When you enter the cooking time and press "Start", if the timer counts down and the oven lamp comes on, but the the turntable, cooling fan, and microwave section do not run, then you have a bad secondary interlock (bottom door switch) or its mount is bad.

We have the applicable service manuals for these models and have uploaded it to our site here and here to help you.

Also look at this info on door switch diagnosis and replacement.

Hope this helps.

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

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com
Microwave Oven Control Panel Repair Nationwide

May 30, 2010 | Sharp R-1491 Microwave Oven

1 Answer

Timer counts down but does not microwave


you have a problem with the door interlock switches and it should not be used till fixed.

Apr 24, 2010 | Sharp R-23GT Microwave Oven

1 Answer

SHARP MICROWAVE R9H20 STOCKED FOR LONG


if the problem is tempermental then is sounde like you may have a failing interlock switch. this is a series of switches that are activated then the door closes. there are normally 3 and you would be looking for/ replacing the middle the Primary interlock...

Hope that helps

Jan 11, 2009 | Sharp R-510HW Microwave Oven

2 Answers

Microwave Oven EM-804T


You need to trace the power feeding the high voltage transfomer. Because the table doesn't turn, it implies that a door switch or safety interlock is the problem.

Jan 01, 2008 | Microwave Ovens

1 Answer

No heating, no clock, no timer, otherwise fine!


One of your door interlock switches is defective . I would suggest having it repaired by a qualified repair tech in your area.

Oct 04, 2007 | Sharp R-1500 Microwave Oven

1 Answer

No Heat


This is probably due to a bad door switch, most likely the top one. The microwave got hot because the cooling fan was not running. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your model number here: http://www3.sears.com/

Apr 26, 2007 | Sharp R-1492 Microwave Oven

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