Hey,
So I'm troubleshooting this
Philips Micro Hi-Fi System MCM390, going over some burnt caps and other possible damage I might find. The unit let go some magic blue smoke.
When I opened the unit up, I noticed this odd "bodge" job which I wanted to share and get some input. While I'm not sure it is a bodge job, it doesn't seem to have been "properly" designed if it isn't.
In picture A, you can see a rather large piece of paper (kind of like construction paper / cardboard) that has a copper foil glued to it. To one end, is connected to a Capacitor, and, at the other end, what looks to me to be connected to the GND plain.
In picture B, I've located the capacitor in question, green, labeled 244K. I take this to mean 0.22uF, and it looks like a Polyester cap with 10% tolerance (K), but maybe I'm wrong.
Anyway, the question is, why the huge copper foil to connect between the cap and the GND plain? Surely a wire would have been sufficient? Did they try to create some kind of capacitance / inductance between the cap and the GND Plain? Or some other kind of effect? I don't see why they would have done this, perhaps you guys have some idea.