- Usual failure modes of magnetrons? - 3 Updates
- lost one channel on an old Onkyo amplifier - 3 Updates
| tabbypurr@gmail.com: Apr 03 03:28AM -0700 On Thursday, 2 April 2020 06:36:22 UTC+1, John Robertson wrote: > really should put them up on my site in case someone wants to fix older > units. Really, someone might want to! > John :-#)# Door switches take more than a few amps, and that still applies to a lot of current prodution units. Microwave interlocks use 4 switches in a self monitoring configuration. If a switch should open but doesn't, another monitoring switch shorts the power feed (via a resistor) which blows the main fuse. 2 series switches without monitoring were used in the 1970s. I've seen much worse in historic machines, I remember one that continued cooking with the door part way open. NT |
| Chris Jones <lugnut808@spam.yahoo.com>: Apr 03 11:00PM +1100 > Door switches take more than a few amps, and that still applies to a lot of current prodution units. > Microwave interlocks use 4 switches in a self monitoring configuration. If a switch should open but doesn't, another monitoring switch shorts the power feed (via a resistor) which blows the main fuse. 2 series switches without monitoring were used in the 1970s. I've seen much worse in historic machines, I remember one that continued cooking with the door part way open. > NT I saw an interesting very old Moulinex one which seemed to have a fairly loose door, but when it started cooking, an electromagnet pulled the door very tightly onto the oven. Before I tried it, I expected it to be very leaky but it was one of the least leaky I tested. |
| Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Apr 03 12:07PM -0400 > 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 You have to catch it first though. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com |
| mcurran1230@gmail.com: Apr 02 12:14PM -0700 Try the fuse. I had same problem on a 80s TX 2500. It was one of the fuses. Replace both. |
| John-Del <ohger1s@gmail.com>: Apr 02 12:30PM -0700 > Try the fuse. I had same problem on a 80s TX 2500. It was one of the fuses. Replace both. Almost 5 years ago. I suspect he either repaired it, had it repaired, or scrapped it by now. |
| John-Del <ohger1s@gmail.com>: Apr 02 12:36PM -0700 > Try the fuse. I had same problem on a 80s TX 2500. It was one of the fuses. Replace both. That was 5 years ago. Also, he said it was just the balance control mistakenly rolled over to one side. |
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