MisterBill2
- Joined Jan 23, 2018
- 18,180
If probing some point with the meter causes the relay to operate then I would suspect an open connection someplace. A few years back I was given an amplifier that "just quit working one day", with no smoke or noise or anything. Although it had a Kenwood logo and a Kenwood part number, Kenwood denied ever maaking it, so no circuit information was available at all. Then I examined it very closely and saw some solder joints did not look good. So I resoldered every joint on the PCB, which took almost 20 minutes, because there wer a lot of them. After that the stereo amplifier worked perfectly, and still works perfectly. On some occasions, resoldering all of the connections is a cheap and easy fix, if one is good at soldering. Certainly there are some who can do mare damage with a soldering tip than other could do with a big hammer. THEY should avoid this advice.
My whole point being that a failed solder connection can cause all kinds of problems.
My whole point being that a failed solder connection can cause all kinds of problems.