One of the cables on my electronically opened/closed garage door snaps into place during the last foot or so of travel when the door closes. The (edge of the) uppermost panel of the garage door catches one of the cables and pulls on it a second. Then the cable rolls off the side of the door and hits the door frame with a snap! I’ve found that the cable does not clear the door at this point of the door’s movement, and it seems it’s because the door is located slightly to the right of center within the doorway.
I can move the door to the left a little bit, re-centering it somewhat. That will solve the problem for a day or two, but the door always migrates back to the right and the cable catches and snaps again.
What should I be looking for / adjusting to solve the issue?
One cable is not at the same tension as the other. You need to put the door down, clamp the operating shaft and readjust the grooved pulleys. You need to know what you are doing for this job.
Depends on what needs to be done and what type of springs. Most of the door and the the opener are pretty easy to work on. It is only the Garage Door Torsion Springs that are very dangerous to try to change. Extension Springs aren’t really that dangerous at all.
There is a way. It’s possible to (carefully) release the tension on the torsion spring. There are videos showing how to do it, and I’ve seen it done in person, it wasn’t complicated. Just wear safety glasses when doing it.
Then, one that nasty torsion spring is disconnected, there’s things like the “Ez-Set Torsion Conversion kit”.
In essence it removes the thing that makes a garage door not DIY friendly by adding a ratchet mechanism so you can add tension to the spring with an electric drill.
If this thing ever fails, just do it again with a new one. Will save you a lot of money.