I have a non-working processor board from S+. It has a good set of SP and SS chips but the #3 reel does not lock up at power on. When I received this board the SP chip was installed backwards.
I have repaired pinball MPU's and capable of board repair, IC removal, etc., but a newbie with slot machines.
Are there any technically able people on this forum that can walk me through testing or repair on this board? The symptoms as I stated are the #3 reel doesn't lock up. Board is 7550570.
BTW, I installed a working board in the game and the #3 reel works normally, so the problem is certainly with the processor board.