| kevin.kb.brandon@gmail.com: Apr 01 05:36PM -0700 On Tuesday, January 10, 2012 at 9:29:34 AM UTC-5, klem kedidelhopper wrote: > all my life and although I've never heard the term before I firmly > believe that "crap engineering" is in everything today and is > definitely alive and well in China. Lenny Hey Lenny, A repairman once told me that opening the door before the timer stopped the operation was bad for the magnetron. He said the unexpected interruption was a shock that over time led to more frequent magnetron failures. Do you have any knowledge or opinion about this? Thanks in advance. |
| Phil Allison <pallison49@gmail.com>: Apr 01 08:23PM -0700 kevin.k...@gmail.com wrote: ---------------------------- > Hey Lenny, > A repairman once told me that opening the door before the timer stopped the operation was bad for the magnetron. He said the unexpected interruption was a shock that over time led to more frequent magnetron failures. Do you have any knowledge or opinion about this? ----------------------------------------------------- ** There are hundreds of bullshit myths like this put around to blame users for failures that were nothing to do with them. It a variation on the "blame the victim" logic. Used when the real culprit desperately needs an excuse. Or a supplier want to avoid a valid warranty claim. Never fall for it. .... Phil |
| John Robertson <spam@flippers.com>: Apr 01 10:36PM -0700 On 2020/04/01 8:23 p.m., Phil Allison wrote: > ..... Phil I agree with Phil. The only thing I could see having a problem when you open the door prior to the microwave timed out is the actual door safety switch, and only if it carried a few amps of current - perhaps so on early microwaves. A simple signal switch doesn't care much if the current is micro-amps it will last as long as it would with no power. X number of door openings - typically a million or so for a good quality switch. The magnetron wouldn't care either, it has a certain number of ON (powered up) hours in it, and considering the cycling the magnetron does on reduced heating times, then that too is quite a long time - for better quality units. I've not seen the schematics for a microwave, but I assume that sensible safety requirements would have at least two switches to disable the magnetron if the door was opened when operating. When I bought out our local TV/VCR/small appliance parts shop last year there was also a bunch of microwave parts - magnetrons, big caps, etc. I really should put them up on my site in case someone wants to fix older units. Really, someone might want to! John :-#)# |
| John-Del <ohger1s@gmail.com>: Apr 02 07:38AM -0700 On Thursday, April 2, 2020 at 1:36:22 AM UTC-4, John Robertson wrote: > I've not seen the schematics for a microwave, but I assume that sensible > safety requirements would have at least two switches to disable the > magnetron if the door was opened when operating. Later generations have them wired in a make/break situation so in case a switch sticks closed or is intentionally jumped out, it shorts the supply and blows the main fuse. |
| Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Apr 02 10:47AM -0400 On 2020-04-02 10:38, John-Del wrote: >> safety requirements would have at least two switches to disable the >> magnetron if the door was opened when operating. > Later generations have them wired in a make/break situation so in case a switch sticks closed or is intentionally jumped out, it shorts the supply and blows the main fuse. You can still stick a knife in the interlock if you need to fry somebody's intruding drone. ;) Cheers Phil Hobbs |
| "pfjw@aol.com" <peterwieck33@gmail.com>: Apr 02 08:05AM -0700 On Thursday, April 2, 2020 at 10:47:20 AM UTC-4, Phil Hobbs wrote: > You can still stick a knife in the interlock if you need to fry > somebody's intruding drone. ;) Total immersion is simpler. Add a bit of salt or baking soda to the water, that makes the damage irreparable. Peter Wieck Melrose Park, PA |
| Ahmad Sayyah <41830151@students.liu.edu.lb>: Apr 02 02:40AM -0700 Hello, can you send me the solution manual of electronics a systems approach 4th edition |
| Fox's Mercantile <jdangus@att.net>: Apr 02 07:53AM -0500 On 4/2/20 4:40 AM, Ahmad Sayyah wrote: > Hello, can you send me the solution manual of electronics > a systems approach 4th edition Please pay attention. He doesn't read the newsgroup he spams with this crap. You have to reply directly to whichever one of the many email addresses he uses. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
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