Quoted from misterhare:Hi all,
I have a Disco Fever with a Rottendog MPU327-4 in it. The kickout and both drop target coils were locking on when I turn the machine on and blowing the F2 fuse. I replaced the diode on the kickout coil and it was still locking on so I don't think it's a diode issue.
Is this a board issue? Do these three coils share the same connector? If so, does anyone know which one?
Did you measure the coil resistance?
It should be around 3 ohm.