Wanted: Appliance / household wiring experts
I have a crazy household mystery that's bugging me, and because we have so many clever, creative "how to design it/make it/fix it" types in our midst who love figuring out what makes things tick, I humbly bring this mystery to you and ask for your insight. :)
Note that there are several bits of evidence to consider. Here we go . . . 1. I left the house to do two pet sitting jobs around 3:15 this afternoon. I returned at about 4:40. When I opened the front door, I could smell hot wiring and there was an electronic or appliance buzzer screaming somewhere in the house. I raced into the kitchen to find my huge, ancient microwave oven in full coronary arrest. The machine was on, full throttle, and multiple lights on the keypad were lit; none of them would work to my touch, though.So. Did my elderly microwave just fritz out on its own? Did the power blip out for a second and cause the microwave to spaz out? Did the overheated microwave (who knows HOW long it was going at full blast?!) cause the house power to short out? Did the cat set off the microwave which blipped out the power? Was it aliens? Any and all ideas are welcome! |
I hope you're unplugging the microwave; or, have it plugged into a power bar with a switch where you can turn the power off before you leave the house now.
I'm unsure of the relevance of the garbage can; unless, you have a pet that can get on top of it and claw at the microwave control panel. ETA: A lot more info was added to the OP since I posted this. I wouldn't continue to use that microwave. |
I wouldn't leave that plugged in. Period.
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Where is your kitchen garbage can normally, in relation to the microwave?
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Do you use scented garbage bags?
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oh and buy a new microwave. i know you like the older, "reliable" stuff but really, this is technology that is still improving and not super expensive. Why risk it?
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OOOPS! I hit the wrong button early in my narrative, and accidentally posted it. Unfortunately, I was far from finishing it. SORRY!
Meanwhile you all came up with some great info and questions! Please reread the original post to see if any of the additional info helps... ETA: It's unplugged now, and will stay that way. ;) Also: https://i.imgur.com/8eXPHw6.jpg https://i.imgur.com/2ycPL9B.jpg |
defrosting what? You want easy? put it in a ziplock and dump it in a bowl of hot tap water.
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...and if it's really old, unlikely the buttons are sensitive enough for a cat to activate. could have been something caused by a powercut..... but dude, dump it
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Do not continue to use that microwave. Throw it away immediately.
Think about it this way: even if it was caused by an errant power flicker, or a cat's stray paw, those situations could happen again in the future. What's more, if you have an electrician look at the internal wiring, the only way you'll know for sure if the repair worked is if ten years go by and your house still hasn't burned down. If you're wrong, you'll find out the hard way--and if it happens at night, you could die from smoke and carbon monoxide inhalation before you ever have a chance to wake up to see the danger. Your life and home are not worth saving $60 on a new microwave. |
Power outages can be preceded by power surges and the old microwave may no longer be able to handle the surges even though the amperage rating for the house wiring and circuit breakers/fuses can.
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As for my cat, I can't rule out his pawing the touch pads. There are freakin' cat prints all up and down my fridge, oven door, and dishwasher. They all have black reflective surfaces (just like the microwave), and the stupid cat thinks there's another cat in there. He does the same thing when he sees his reflection in a window. Cat prints everywhere. I once found cat prints up and down my bathroom mirror. :D https://i.imgur.com/0ztFwHx.jpg https://i.imgur.com/rAKjkSb.jpg |
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And it's not about the money; it's about stupid new stuff with stupid programming. Does anyone make a microwave these days that doesn't force you to fuck with defrosting food every 60 seconds? |
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/rant :rolleyes: :p: |
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yes. but..... it's better/faster if you rotate it....... |
Heh. That's what he said. :D
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Oh, you betcha. ;)
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Bought a Sharp in 1973, big sucker with the carousel and knobs, for almost $500. It lasted 25 years and 1 month.
Replaced it the same day with another Sharp, I think it's 1.8 cubic feet, big power, carousel, buttons for auto-defrost, auto-reheat, popcorn, potato, so easy even I can do it, Less than $150. Plus I have a spare glass carousel plate in case I break it. And used the carousel turntable drive with a small platform for spray painting objects 360 degrees. You can use the unplugged one as a kitten proof bread box. |
Power flicker probably caused the microwave to turn on suddenly, spooking the cat, and causing it to knock over the trash.
If the microwave seems to work fine now, I would also have a hard time tossing it. But it's the smart thing to do. You WILL get another power surge in the future. |
I'm late to the game, but definitely toss the microwave. I thaw meat in the kitchen sink, that way I don't have to change the water in a small volume container.
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Alternatively, if you are very confident in your diligence, you could plug it in, use it, and be sure to unplug it every time you are done. Or plug it in to a switched power strip you turn off after every use. But I don't like that power strip idea because I know that I would forget to turn it off. Unplugging is a bigger ritual you would notice not performing.
Unplugging is what I do to my table saw, and it's like locking the door when you leave the house. I do it every time. Great ritual. |
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If you had a surge, then a microwave is damaged - no longer works. And some of other less robust appliances (ie GFCIs, clocks, central air controller, door bell) are damaged. Not one reason is given to suspect house wiring or a surge. So those wild speculations are binned immediately. Honest replies also say why with numbers. We even saw this once in a factory where a toxic gas (phosphine) was vented into an area of construction workers. Fortunately a bird fell dead before those construction workers got too close. That is when I was brought in. Sometimes power does not fully turn off or on. Intermittent and quick AC offs and ons cause DC voltages to vary to intermediate voltages. (What glatt calls a power flicker.) Computers that run on 5 volts get disoriented when that voltage is below 4.8 and does not fall to zero. Then the computer can start babbling; executing code that makes no sense. In our case, a babbling computer powered open every valve venting a large tank of toxic gases. In your case, it simply instructed one relay to close and stay closed. Your PC is not a real time computer. So it does not need this major human safety device. That computer inside a microwave is real time. So a watchdog timer literally creates a heartbeat. If the real time computer does not issue the proper heartbeat every few milliseconds or seconds, then a watchdog timer cuts off power to everything. But back then, despite even telling this to some people's face, some so called designers would ignore the warning and not implement that watchdog. Or would write code in a manner that even a babbling computer would still act as if functioning properly. In short, your microwave either does not have or did not properly implement a watchdog timer. So quick AC power interruptions caused a babbling computer chip to power on the microwave with nothing to time it (power it) off. Can we say that with certainty? No. Do you have symptoms to justify that event? Yes. Did anyone support their conclusions with the always required reasons why and perspective? Obviously not. So this is your only possible answer that has any credibility. Back then, watchdog timers were typically separate chips provided by companies such as Dallas Semiconductor. Today, that essential human safety function is standard in all single chip computers. And yes, this many decade old (that well understood concept) is clearly something new to you and others. So understand it will require at least three (or more) rereads. And maybe only after asking a few questions. |
So you are saying the power fluctuation caused it, and the microwave has always had this problem? It's as good today as the day it was new. But it will likely happen again if the power fluctuates in the same way in the future?
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Other speculated anomalies (ie a surge) do not explain those symptoms. For example, if power on was created by a surge, then that oven would remain always powered when plugged in. Fact that it worked normal after power cycling implies a problem often found with real time single chip computers of that vintage. And not something created by a mythical surge. If a cat started it, then that microwave eventually timed out. Or a thermal safety monitor cut off power. Unlikely a cat can just happen to hit a right sequence of keys. Or even has sufficient paw strength to depress those keys. Provided was enough information to provide relevant facts - to define the defect. Much later comes a solution - which typically does not involve trashing a microwave. Little facts, such as the above requested behavior of incandescent bulbs, is significant information. Also the state of other household appliances would say more. BTW, when one only understands how to 'wreck shit', then even "electronic rust" is proof that Martians are conspiring with the Rovers to kill us all using our microwave ovens. Since extremists tell us those also used processor chips of same vintage design. He would accomplish more writing for Marvel. |
Ridiculous, just a load of sundowner gibberish.
Honest posters cite sources. I cited a source. Without sources and numbers the above irrational explanation can be binned. A senile old man like tw, with an extensive history of disseminating misinformation, is not a credible source. Why does he not post credible sources? What is he hiding? Why does no one corroborate his fantastic assertions that his and only his explanation should be accepted with no credible sources cited? Because, he's hiding behind lies and he can't dazzle with brilliance so he tries to baffle with bullshit. Smoke and mirrors. Tw is a moral enemy of all honest Americans. |
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I'll have a looksee/picturetake today. If I don't forget. ETA: Yours is in infinitely better condition. |
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Listing specifically what each appliance did provides critically essential facts necessary for a better answer. Notice which devices contain circuits to remain powered longer. Even your computer has a specification for how long it remains running uninterrupted with no incoming AC power. A number even stated in the original ATX Standard. And that is typically much longer in many computers. This "uninterrupted without AC power" feature is found in all electronics and is especially necessary due to 'dirty' UPS power. Since a UPS must disconnect all power for a long time to eventually switch to battery power. They don't like layman to learn such realities. It might reduce sales. How each item responds to an outage (or flicker) is unique to the that design. Applies both to today's more robust electronics or to 'rumored' more sensitive electronics from 40 years ago. Quote:
All appliances contain protection superior to what plug-in protectors claim. What so many call a surge (ie 120 volts approaching or exceeding 1000 volts) is really only noise (maybe a few tens of volts. Was your microwave exposed to a 1000 volt transient? Then how many other appliances are also destroyed? 120 volt electronics (even before the IBM PC existed) were required to withstand up to 600 volts without damage. Did I mention honest people also provide perspective - numbers? Where is one reason to suspect a 1000 volt spike? Not one fact suggests a surge. And plenty of facts that say it did not happen. A surge is rare - maybe once every seven years. In your venue, typically less often. Things that suffer from a surge are permanently damaged - are never restored by power cycling. Surges do not weaken. They destroy or they are safely consumed as if 120 volt electricity. This from one who designs, who has traced surges, restored damage, and submitted everything to design reviews. Even before a Cellar existed. Move on to anomalies that would actually explain your symptoms. One typical example was detailed previously. But nobody can say anything more until you provide more requested information. Neither power outage nor restoration is or creates a surge. Only the many manipulated by sales propaganda and Donald diatribes never learn that. Move on to real world knowledge. Quote:
Meanwhile, more informed conclusions are possible if behavior of each item (not just clocks) is individually listed. What is the problem with common sense? It results in junk science IF relevant science concepts are not first learned. We all learned what must exist to have knowledge - a hypothesis and experimental evidence. Common sense without first learning basic electrical concepts means no hypothesis; is how junk science gets promoted. We all here saw this happen and watched lies be exposed even long before the invasion started. Because so many used common sense to know Saddam had WMDs. If 'common sense' conclusions have no numbers, then it is a Richard Nixon or Donald Trump type lie - a worst type. Again, international design standards, long before an IBM PC existed, required electronics to withstand surges. As defined by so many relevant numbers - some already discussed. Stop assuming old means failure. Failure is only defined by specification numbers have been discussed and that others here ignored so as to use common sense. Surges also do not weaken internal protection. It is called a catastrophic failure. Either that surge is harmlessly consumed just like other electricity. Or the part fails catastrophically. Lies about 'weaker with age' or 'weakened software features' were invented by others who only use emotions to be experts. Who are not thinking logically like an adult. You did not have a surge. Your every reason to believe so was promoted by other liars who know only because they feel they are experts. And who never post required numbers with every accusation. Again, how many other appliances were affected by a surge - a voltage approaching or exceeding 1000 volts? Move on to reality. Yes power surges existed in the 1970s just like they do today - maybe once every seven years. A number that can vary even in the same town. You know when a surge exists. Plug-in protectors fail catastrophically on that first surge. In 1987, PC Magazine published TWICE articles on how plug-in protectors fail and then create fires. A problem that continues so often today that APC finally admitted some 15 million protectors must be removed immediately due to less than 1000 house fires directly traceable to that one protector. How many 'surge' experts bothered to learn that reality? How many protectors in your house tried to create a fire during that assumed surge? Electricians do not know how electricity works. Electricians are experts on what must connect to what - according to code - so that human life is not threatened. Electricians have little grasp of how a microwave works, what a protector does, or even what impedance is. None of that necessary to memorize what can connect to what. Do not confuse an electrician (a technician) with an engineer or scientist. Completely different knowledge bases. An electrician could only have a funny look if a watchdog timer or voltage supervisor was mentioned. Those basic electrical concepts are never taught to electricians. So, what was the behavior and resulting state of all other affected and unaffected appliances? Where is behavior of incandescent bulbs reported - since basic electrical knowledge says that is a major and critically important fact. Do you have any video games? For example, did a PS4, not powered on then but plugged in, go into a safety lockout? A critically important fact. Incandescent bulb behavior (what is relevant detailed earlier) next week and last month is also a critical fact. Including behavior of a bulb powered from that microwave's receptacle. BTW, which year was the microwave built? Difference between 1970, 1973, 1976, and 1979 is electrically significant. An example of why facts (especially numbers) are so important for better assistance. I believe Spielberg once wrote a famous paper about how microwave ovens and other household appliances can kill us. It was then made into a Hollywood movie called Gremlins. I was surprised that Sexobon did not bother to cite facts from that Spielberg paper. |
TLDR
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All ramblings of an incoherent senile mind. No credible sources linked. Scatterbrained offshoots about Saddam Hussein, WMDs, and Richard Nixon in a discussion about a microwave. Twisted tangents into video games, surge protectors and Hollywood Movies in a discussion about a microwave. All attempted obfuscations to the self evident failure to read what was written and lack of reading comprehension. Asks leading questions after drawing conclusions in desperate search for confirmation bias responses. Dissemination of disinformation, smoke and mirrors cover-up, and general distain for honest Americans helping a fellow American out. A tragic waste of the human organism he inhabits. Tw is public enemy #666.
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^^^WHS^^^
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If a surge exists, it is incoming to everything. Is everything damaged? Of course not. That surge is hunting for best connections to an outgoing path - earth ground. So everything has a surge incoming. And some (multiple) items are a best outgoing and destructive path. Their destruction is what protected other appliances. Their damage indicates that a homeowner all but invited that surge inside. How many other appliances were damaged? Most failures (that get blamed on surges) are actually manufacturing defects. Nobody can say anything more until catastrophically destroyed internal parts are identified; the destructive incoming and outgoing path identified. But you clearly did not have a surge - since no damaged appliances are identified. And since surges never create what was observed in that microwave. Move on to other far more likely suspects. Again, to say more, provide that information. No honest recommendation is possible until a problem is first confirmed. Not even identified is that microwave's design year - 1970, 1973, 1976, or 1979 technology. Not identified are any other appliance in safety lockout mode. Even the resulting behavior of each display (clock) still is not listed. Technologies changed that much in that period - another relevant fact that remains withheld. Do you want a solution? |
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The some clocks being ok and some had to be reset could be the ok ones have a battery or large capacitor to bridge short lapses in power. The other possibility is most houses have a 220 volt service(actually 240) that comes in on two 110 volt lines. Both are used for 220 appliances, but one is used for wall outlets. In order to balance the load about half the outlets will be on one leg and half on the other. I've seen more than once one leg coming in be interrupted and the clocks needing to be reset may all be on one leg.
The Sharp carousel microwaves you don't have to turn the food, it's turning all the time. By some king of fucking magic when I open the door and set something on the platter, no mater what time I give it when the time is up that item is exactly where I put it. 30 seconds or 30 minutes or 533 seconds the item is right there. :unsure: |
I just set my phaser to heavy stun and it defrosts most anything in less than a minute.
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Microwave defrosting BAD!
If you are in love with the thing just leave it unplugged when you're not using it. |
Don't use the microwave.
Use the oven instead. Let's be healthy. Fuck bread. |
I see what you did there. Acknowledged and approved, sir.
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:D
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:lol2:
Fuck bread. |
Ha!
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As for the turntable lining up every time . . . http://www.openminds.tv/wp-content/u...not-saying.jpg |
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The turntables are in-built, or built-in, I ferget which, now-a-days. Wouldn't have a micro without one, tbh. |
What is it w/microwaves and regular ovens? I bought a microwave a while back to replace one that was haunted.
The old micro thawed a pound of hamburger in about eight minutes. The new one's manual calls for 15+ minutes. Hell, I can do it that fast in a warm bowl of water! Our regular oven was trying to burn the house down so the 'rents went out and got a new one. The old oven would preheat to 445 degrees in 4 minutes 15 seconds (I used 445 because 450 takes an extra 2 minutes 15 seconds, what's 5 degrees?:)). The new one? 12-16 minutes so far. And the new one when preheating shows the temp instead of time remaining,<--which I find more useful. I was expecting better heating performance, especially when you consider the price: $666 and change, I shit you not. I told them "If you'd waited a couple days, I'd have bought a used one for a couple hundred bucks. Here's a couple hundred bucks.":neutral: |
And I didn't drink for week.
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https://www.practicallyfunctional.co...-3-800x533.jpg The old man would invariably spill shit in there (or cook it so long that it boiled over), and that shit would get beneath the plate and gunk up the little wheels of the tripod thing that held the plate. PITA!! |
Ooohhhhhhh, that. Yeah I can see the pita what with the tripod and the wheels and the stuff...
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Mine just has a tiny little three-petaled--thing--that the big ol' plate kinda sets on, no wheels.
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