good for you fixing a vintage microwave. Mine is also an oldie - an engagement gift pre 1986. All of a sudden the timer countdown works but no microwaves being generated. I asked a friend who told me to check all the micro-switches and sure enough they were all heavily pitted from arcing. I replaced them all and used silver solder to fix them. Still works great. Knowing soldering saved my old stuff many a time.
Pharma Phil
---------- Original Message ----------
From: Instrument Resources of America <[email protected]>
Date: May 3, 2020 at 2:31 AM
I had to repair my 45 plus year old Sharp kitchen microwave oven just last week. A relay's coil terminal, solder joint on the PCB was completely cracked all the way around the pin. Re-soldered it and works just like new. I chalked it up to the constant vibration of the door being shut. Ira.
On 5/2/2020 3:24 PM, ' [email protected]' via neonixie-l wrote:
--It was meant as a joke. I still use SnPb eutectic solder, and I think my ~1 kg is a lifetime supply I think I can blame this for my dumbness, since I used to hold the solder in my teeth during construction and repair.
I have this religious belief, scientifically not proven, that Pb-free solder made some of the surface-mount boards in my car less reliable. There were some medium-power current-limiting resistors where one of the solder joints eventually cracked ad left an open circuit. I blame this on the ROHS solder being more brittle and the thermal cycling eventually fatiguing and cracking the solder after 5-10 years.
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