Question about Sharp R-509BK Microwave Oven

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Sharp R-509 microwave runs all by itself when door closes but no heat.

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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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 Answers

SOURCE: microwave seems to turn on when door latch is opened

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

MicrowaveSvc
  • 9047 Answers

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

SOURCE: Fans continues to run.

door switches or control circuit, may be loose contact or open check all wiring and circuit...

Posted on Dec 18, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: Sharp Carousel Microwave door latch stopped working door won't stay closed

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.

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

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Posted on Apr 18, 2008

  • 1 Answer

SOURCE: Sharp Carousel Microwave door latch stopped working door won't stay closed

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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Sharp Carousel Microwave I heated some food. It worked fine, and shut off when it was done. I took out the food. When I closed the door the light stayed on. Light will not shut off. I tried...


Sometimes the switch in the door latch sticks. Mine did that and I ust closed the door with just a slight more force and everything started working fine.

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The door has latch switches that are part of the protection and operation when door is closed, is the new door identical and switches match up {same number} if everything checks and the door switches are all working, the door needs to be checked for alignment, if it's out a small margin the switches will not operate properly.

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Microwave won't come out of start up mode. Clock flashing 00:00 and interior light on. Just moved house, owned micro for 3 years, lost manual in move. Please help.


could be a broken door hook; defective door microswitch or the microswitch bracket itself. the door just may need adjustment; as many people lift microvave by the bottom of the door; which is a no-no.

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No heat, does not cook


Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food?
A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.
 
 
Q - My microwave is running and sounds like it is working but will not heat up anything.
A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....
 
Q - The microwave display counts down and the inside light is on,  but nothing is heating and the fan is not running.
A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
 Q - My microwave went dead when I opened the door ( same problem as closed the door ).
A - This often is a stuck or faulty door switch and it has blown the interior microwave fuse.
 
 
Q - My microwave is completely dead.
A - House fuse has blown or interior fuse inside the microwave has blown ( usually a part inside the microwave makes this fuse blow ) Sometimes a bad fuse holder inside the microwave cannot hold the fuse tight enough and the fuse will blow as well. 
 
 
Q - The fan in my microwave oven is not running will this hurt my microwave?
A - YES, the fan cools the magnetron and electronics, take the microwave in for service, most fans are not too expensive to replace.
 
 
Q - My microwave blows the fuse inside itself as soon as I push the start button.
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Mar 01, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Our microwave/convecton turns itself off after about a minute


This is a problem in one of the damper-related components, most likely the switch, but it may also be the motor or the damper door.

The damper is a door inside that opens or closes depending on cooking mode. If the controller senses that the door is not in the right position, it will shut down the cook cycle.

Sharp models stop after 59 seconds.

See the attached sample photo for a typical damper assembly.

We have the applicable service manuals for these models and have uploaded it to our site here and here to help you. You will need the free Adobe Reader to view or print it.

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.

Feb 05, 2009 | Sharp R-1870 Convection/Microwave Oven

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control panel is hung up - replace panel and keypad.

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Fans continues to run.


door switches or control circuit, may be loose contact or open check all wiring and circuit...

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It seems the micro switch for the door close have moved from and is not aline the door clip or the micro switch is faulty

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This is normally 1 of the interlock door micro-switches not working.

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