So I do some quick research, find that the 1, 2, 3, and Start buttons on the 5200 controller are all tied to Pin 7. I open up the controller, find the red/white wire for pin 7 and do an end-to-end continuity check. Nothing. All the other wires were fine, though. So I start incrementally checking the red/white wire as far as it's exposed leading up to the cable's collar, and it's whole. Unwillingly, I carefully trimmed off the collar and continued checking the wire, hoping to find the break very close to that end. Still nothing--I've got continuity to over 2 inches past the collar. Crap. So then I start checking continuity at the plug end. By that point, it's getting messy; I've already made several surgical incisions to expose the red/white wire for testing, and I STILL hadn't found the break. FINALLY, I go back to the controller end of the cable, cut back the wrap another 3 inches and THEN I find the break in the wire--some 5 inches down from the collar. What rotten luck, even by 5200 controller standards. So I'm able to patch it back up and get it working again, although by the time I had to tape all the cuts back closed, it truly looks like a ghetto controller.
But the whole situation got me thinking--was there an easier way to find the break without having to make all the exploratory incisions in the cable? I know that there are wire break detectors commonly used by owners of buried invisible fence lines which use something like an AM radio signal using the suspect wire as an antenna and a receiver to figure out the approximate location of a the break. But is there anything that works at a much smaller (and therefore more precise) scale? What I'm thinking is a device that you hook to one end of the wire and emits a simple square wave over a radio frequency, and then have a receiver which picks up the tone as you move it along the cable (presumably, the tone would change once you pass the break). But I have no idea if that would work on the scale of locating a break within an inch or so.
Has anyone run across a similar problem for which they've found a solution? It's pretty much a moot point for me now since the damage is already done. But I'm intrigued by the challenge of coming up with a more elegant way of addressing the problem should I run across it again in the future.
Edited by gzsfrk, Fri Sep 28, 2012 2:50 PM.