I have a non working left slingshot on my Bally Kiss.
I changed the Q10 transistor and the diode. Then I changed U3 chip.
I tried with a board from my Bally Star Trek and the left slingshot works perfect.
I changed back to the broken board and suddenly the left slingshot worked for about 5 minutes then dead again.
I grounded the Q10 and the coil fires. Seems the problem is on the board, a glitch?
What should I try next?