Topic: Heater - yes wires can internally break beneath insulation
I don't know how important this is, but I was chasing a problem for a long time today....I resoldered pin connections, messed with this, and that. Tried to determine if my fet was dead...but then eventually realized that it was merely the wire connecting my board to the heater cartridge that was flat out broken. I pulled from both ends and it snaps at the point that was merely insulation. I should have realized this sooner, but it never crossed my mind.
TO clarify; i'm saying that the metal strands inside the insulation were completely broken, though externally the wire had no sign of stress. I've never heard of this happening...so I was very surprised when it was the answer to my problems.
Well, that was fixed, and all is well now. But it was very perplexing as I was trying to solve it. Now back to my other printing problems