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ApplianceGuru.com: The Samurai Appliance Repair Forums > Do-It-Yourself Appliance Repair Help > The Kitchen Appliance Repair Forum > Adjusting microwave door switch timing |
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| Moderated by: BrntToast, RegUS_PatOff, appl.tech.29501 | Search Our Sites for More Info! |
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| Adjusting microwave door switch timing | Rate Topic |
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| Posted: Thu Feb 4th, 2010 06:02 pm |
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1st Post |
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binovc Senior Apprentice Appliantologist
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I'm working on an older Magic Chef microwave (probably 1990 or so). The model number has been "cleansed" away from the decal inside the oven, sorry... I'm hoping that my request falls into a more generalized area. This oven suffered the "fuse blows when door is opened or closed" malady. There's a convenient decal inside the chasis that states when you replace the fuse, also replace the primary interlock switch and the interlock monitor switch. The interlock switch definitely shows burn marks emanating down one of the terminals, so the inside probably is the culprit, and I will replace the switch. I didn't notice the burn marks on the switch until after I got done playing around with different door switch timing adjustments (to no avail). There are a total of 4 microswitches on this unit. 2 mounted on an upper carrier, and 2 on a lower carrier. Each carrier can be adjusted forward or backward, thus adjusting when the door will trigger each pair. I initially thought maybe the switch timing was at fault, and I blew 3 fuses by trying to get the switches adjusted to operate simultaneously, first during door closing, then during door opening. Then I ran out of fuses. My question is where should these switch pairs be adjusted relative to each other? Should they be timed to operate simultaneously when the door is opened? Simultaneously when the door is closed? Should one set be timed to trigger slightly ahead of the other - either during door opening, or during door closing? By how much? Thank you for the insight.
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| Posted: Thu Feb 4th, 2010 10:50 pm |
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2nd Post |
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appl.tech.29501 Fellow, Academy of Sublime Masters of Appliantology 
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Gonna be hard to bet info on this without a model #, however I will try to did it up. That being said I have never seen a microwave blow fuses by opening and closing the door unless something is shorted..however I guess anything is possible.
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| Posted: Fri Feb 5th, 2010 12:47 am |
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3rd Post |
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RegUS_PatOff Fellow, Academy of Sublime Masters of Appliantology 
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yes, the Door Switches are designed to blow the Fuse if the Switches don't operate at the correct time. One of then is the Monitor Switch, which, when the Door is open, shorts across the Magnetron (for safety) ... but there is usually only (3) Swithces ... and yes, we'd need a model number, OR possibly post a picture of the Microwave ...
____________________ The new repair forums==> http://appliantology.org RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw my video production: “Easter Seals Walk With Me” http://www.youtube.com/watch?v=-EBiLyYXMiA |
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| Posted: Fri Feb 5th, 2010 02:10 am |
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4th Post |
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binovc Senior Apprentice Appliantologist
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I will see about getting a couple pics, won't be able to get to it again for a few days though. Thanks.
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| Posted: Sat Feb 6th, 2010 07:56 am |
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5th Post |
grey one
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One of the switches is probably not working.. Take out the fuse and use an old socket and wire and clips and install the light across the terminals where the fuse was. If you have a short , the light will be bright, if things are O.K. the light will be part of the circuit and only light up a little. I am willing to bet on a f.u.b.a.r. switch...
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| Posted: Mon Feb 8th, 2010 03:13 pm |
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6th Post |
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binovc Senior Apprentice Appliantologist
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The Primary Interlock switch was carboned up pretty well, but it was easy to open and clean. Not sure if that was the problem, or if someone had closed the door too hard and messed up the timing, but after reinstalling the switch and timing the switches according to an article I ran across, it works like new again. The article (actually an excerpt from a book for sale by Carlton Gallawa - thanks) states that, upon opening the door, the normal sequence of switch operation is: 1st the primary switch opens. 2nd, the secondary switch opens, and 3rd, the interlock monitor switch closes. Thanks for the tips and suggestions.
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| Posted: Mon Feb 8th, 2010 06:09 pm |
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7th Post |
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RegUS_PatOff Fellow, Academy of Sublime Masters of Appliantology
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binovc wrote: ... model number has been "cleansed" away ... hoping that my request falls into a more generalized area. RegUS_PatOff wrote: .. but there is usually only (3) Swithces ... ahh standard Microwave ...
____________________ The new repair forums==> http://appliantology.org RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw my video production: “Easter Seals Walk With Me” http://www.youtube.com/watch?v=-EBiLyYXMiA |
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| Posted: Mon Feb 8th, 2010 06:50 pm |
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8th Post |
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binovc Senior Apprentice Appliantologist
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The microwave does have 4 switches though - don't know if that makes it non-standard, or just "old". Here's pics http://www.flickr.com/photos/cocojen/sets/72157623380733034/ From the schematic, going from top to bottom, Logic Switch, Secondary Interlock, Interlock Monitor, and Primary Interlock.
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