Question about Sharp R-509BK Microwave Oven
I have a Sharp R-509 microwave. When door closes the microwave interior light stays on and the fan and turntable start working but there is no heat. Also the buttons on the control panel don't work, except the stop. When I open the door the turntable & fan turn off but interior light stays on as it should. I'm thinking it's the micro-switch the door latches connect with when door closes but am not sure. Any help would be appreciated.
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Posted on Jan 02, 2017
What's happening is you are activating one door switch a little before the other, and that is causing your light, fan, and turntable to come on. The plastic parts are not perfectly rigid, so they flex a little when you press the button, and that causes the lag to be more apparent. Even if you press the door open faster and look really close, you may notice the light, fan, and turntable coming on for a split second. That's perfectly normal. The relay on the control board must also be turned on before it will actually be cooking.
Posted on Feb 23, 2007
SOURCE: Microwave runs with door open
I would say you have a failing door switch or the mount which holds your door switch is loose or broken. In most designs, it is the upper door switch that will produce these very symptoms when it is intermittent or its mount is broken or loose. Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure. Slamming the door, damage during shipping or transportation and sloppy manufacturing techniques or materials are the primary causes of trouble with the door switch mounts. 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
Posted on Sep 22, 2007
Normally the problem is not the spring, but a broken spring mounting tab on the door latch head (hook) assembly or the inner door panel.
If it's the door panel, it's usually easier and cheaper to use epoxy and some kind of hardware to fashion a new spring mount.
The door latch head (hook) is easy to replace or repair if that's the issue.
We have *critical* safety & disassembly info at our site, linked here: http://tinyurl.com/yzjozk
We also have this full service manual at our site: http://www.microwavedisplay.com/R1480_R1481_R1482_sm.pdf
Normally you have to separate the door panels (as shown in the attached photo) and then you'll see the screws you need to remove.
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Posted on Apr 18, 2008
Microwavesvc, that's what I've had happen with my sharp also, I carved a hook out of a piece of plastic and then epoxied it in, and haven't had any more problems with that.
Another problem I've had with the sharp (that just reoccured, I'm trying to figure it out) is that the micro-switches that the door latch push have gone bad. Originally just one went bad and I replaced it, now the micro has the light and fan on, and won't recognize being closed...
Posted on Jun 11, 2008
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