Question about Magic Chef MCD1611ST Microwave Oven

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Electrical wiring for mcd 1611st the microswitch the normally open and normally closed

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Many micro switches have markings of "NC" and "NO" and "C" on them; indicating which terminal is what. You might be able to get a schematic for this on the Magic Chef web site.

Posted on May 10, 2014

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Most of the times the intermittent problem is due to the door safety microswitch. You will have to take the cover apart and check the two or three microswitches that are actuated in the close/open action of the door. They can be located very close to the locking levers on the right side of the window.
TO check these Microswitches I suggest to use a series circuit with an ordinary filament lamp and a suitable battery or Power supply.
These microswitches have three terminals, although, maybe not all 3 used, They are: a Common, a Normally Open and a Normally Closed.
Please take care not to missconnect or change the terminal positions. A good practice is to take a picture of the connections with your cellphone prior to disconnect. Good Luck.

Nov 11, 2013 | Frigidaire Microwave Ovens

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The oven is saying "close

one of the microswitch that senses the door is closed is deffective or it could be missalinged, it could also be a broken plastic pin (on the door) that pushes on the switch, jus be careful when playing with those switches there could be as many as 4 all around the door and one of them is a safety switch that SHORTS the main electrical feed, so that the fuse burns if one of the other switches fails, you really do NOT WANT TO OPEN THE DOOR WHEN THE OVEN IS FONCTIONING)

Hope this helps!

Jan 31, 2011 | Microwave Ovens

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There are three microswitches in the door latch assembly. One of them has failed (most often the lower one). With some mechanical know-how one can easily replace the bad switch with just a phillips screwdriver. There are two normally-open switches, and one normally-closed switch. They can be purchased off of ebay for about $10, and changed in 15 minutes.

Jan 11, 2011 | Sharp R-520KS Microwave Oven

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I have a Sharp Microwave R-520 KS. And it stopped working. I thought it was due to a latch problem. But now I am not sure. I took it apart -- and the latching and microswitches seemed to be working...

Did you disconnect and test the three latch assembly microswitches with a multimeter or continuity tester? The top and bottom switch are normally-open, and the middle switch normally-closed. The lower switch seems to be the one that takes a beating and most often fails. It should be an Omron D3V-16G-3C25 and can be found on eBay for $10, or via an electronic parts supplier.

Nov 22, 2010 | Sharp R-520KS Microwave Oven

3 Answers

Sharp Insight Pro microwave drawer KB6024MS not working

The drawer often stops working when it is abruptly stopped while opening and forced closed or vice-versa. To fix, simply do the following:
1) Push the draw all the way closed
2) Push the "Setup" button repeatedly until the "Open/Close ...?" appears.
3) Hold the Start Button until the time reappears in the display.
4) Repeat steps 2 & 3 three more times
5) Unplug the Microwave for 30 minutes.
The drawer is now reset. The drawer will now open electronically (automatically) either by pushing the open button on the panel or by pulling the drawer handle slightly.

Feb 05, 2010 | Microwave Ovens

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GE Advantium Microwave section doesn't work.

The primary interlock switch on my Advantium has failed twice. The replacement part is available at: part no. for my Advantium was AP2622452 and it cost $11.74 + $6.95 shipping.

For what it's worth, my nylon connector and wire covering were also scorched a bit but the last primary interlock switch lasted me for over a year.

Please note that I am not an expert at repairing appliances and that I assume no responsibility or liability for any attempt you may make to repair your own appliance.

May 30, 2009 | GE Advantium SCA2000B Microwave Oven

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Turn on the microwave, it runs but doesn't heat anything.

It's probably one of the switches that cuts the power to the microwave when you open the door. Mine is GE 700 watts and has 3 of those, and the one in the middle went bad so a week ago I temporarily bypassed the switch (while I get one) by cutting both wires that go to the switch and put electrical tape at the end of each wire. The switch was supposed to be a normally open switch but it had continuity with the door open or closed, and it should only have continuity (be closed) when the door is open.

Apr 10, 2009 | Kenmore Microwave Ovens

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JMC7000ADW Blows circuit breaker

I've had this problem twice with our microwave. The hint to where the problem lies is that the breaker blows when you open the door at times. Inside the microwave are three microswitches; primary and secondary interlock micro switches and an Interlock Monitor switch. The switches are supposed to shut down the microwave if it is running and the door is opened. But, I've found the upper primary switch can stick internal at times and when the door is opened the stuck switch will, because of the way it is wired as a safety switch, cause either the fuse or possibly the main circuit breaker for the oven to pop. The reason the stuck switch blows the breaker or fuse is when the door is opened the interlock switch will cause the neutral wire from the AC power to be applied to the Upper Primary Interlock switch which normally should be open when the door is opened, but if the switch is intermittent or the contacts weld themselves shut the neutral line is connected direct to the "hot" side of the power line through the fuse and thermostat. The first time my microwave failed the switch had melted the contacts together inside the switch and the second time the switch became intermittent and would blow the breaker to the over ever so often. I suspected the switch the second time this happened and utilizing an ohm meter I checked the switch several times by opening and closing the door and once in a while it would remain closed instead of opening when the door was opened. Of course while trouble shooting the power cord to the microwave must be disconnected and use all safety precautions when working around the high voltage areas inside the microwave. I wrote Jenn-Air about the bad switch and the way it is wired into the circuit, but never received any acknowledgement. I suspect these microswitches are under rated for the amount of current that passes through the switch, thus they overheat and eventually arc the contacts together. I hope this helps explain the intermittent problem and could explain many of the intermittent blown fuse problems I see in these internet help sessions

May 09, 2008 | Jenn-Air JMC7000 Microwave Oven

1 Answer


If the unit sounds like it's operating normally but the food doesn't come out warm it can be a few things. I have only fixed a few microwaves and so far have found exactly the above symptoms on all. Parts to check are the microswitches on the doors (usually 3 or 4 of), the HV fuse (be very cautious not to touch terminals while still connected). These tend to be very common issues. Fuses are around AU$20 - 30 to replace and try spray the microswitched with electrical compliant cleaner. Best of luck

May 05, 2008 | Microwave Ovens

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