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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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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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My GE JE1640 microwave has the following problem: I go to clear, time cook, start & the timer counts down, the light comes on, but the fan doesn't come on and there is no microwave cooking. I have...


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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

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Panasonic NN-2501 Microwave Oven range hood


It is possible that the magnatron is bad but hard to say on a no heat problem without checking all components. A lot of model give 5-7 yr warranty on that part.

Oct 05, 2007 | Panasonic NN-S251 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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Every thing seem to be working, but the fan don't come on.


Quite often this is due to a bad door switch. Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure. I have a text file called "doorsw.txt" which helps in diagnosing and repairing door switch problems, and a critical file called "safety.txt" which is of vital importance. These are at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can order parts for Sharp models from Tritronics at http://www.wehaveparts.com.

Mar 11, 2007 | Sharp R-408J Microwave Oven

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