Ok, so I sorted the hall sensor by zip tieing it in the loom just above the magnet. Works a charm. Can’t sway in to anything to risk a short.
In other news, I noticed that occasionally when I started mutiball, the balls wouldn’t release. It would do a ball search forever but never realease the balls from the lock. In coil test the lock coil wouldn’t work. I had to remove the glass and manually lift it. Then it would work ok for a bit, then do the same.
Luckily I removed the glass quickly to investigate as I touched the coil it was red hot and then started to smoke.
I was in coil test at the time and it suddenly started lifting and dropping as it should. I obviously then turned the machine off and left it.
So in essence. The coil isn’t permanently locked on. It will function correctly sometimes. Does this rule out a dodgy transistor?
I’m guessing The coil is now fried so will need a new one anyway. I can’t test for resistance at the moment as it’s cooling down and I need to get to bed!!
This machine is testing me!!
Edit. I Have a theory and I’d be interested to hear your views. I just read a thread on pinballinfo whereby people had problems with the ball lock not lifting the armature as the gap between the magnet and the arm was too big so it couldn’t lift the arm. I’m thinking if this is the case with mine, the coil stays energised until a ball lock switch is triggered telling the machine a ball has been released, thus switching off the coil. Otherwise it continues to try and lift the armature.
Sound plausible?.? I don’t know. It kind of makes sense given that the coil isn’t locked on the whole time.