Hey guys i'm back. Gone over machine again and again discovered that if you turn off switches 8,16,24 and 32 on the MPU all displays and playfield lights work correctly. Tested across all 32 switches on the MPU and only these 4 switches show a reading of 1140 one way with the MM on diode mode with all switches off ,all other switches dont show a reading. Secondly the 4 switches I mentioned in my 1st post still are dead. I checked the switch matrix schematic and these 4 switches are on the same row with the orange wire common to them all which has continuity between them and back to J115 and to the resister on the MPU which would eliminate a bad pin connection. Finally when I start a game without the ball I press a few things to score then press the trough switch and nothing no bonus count etc as this is one of the 4 switches I mentioned earlier,but when you open the switch again it registers a tilt and then thats it. The score stays up,still says 1st ball,tilt light comes on all playfield lights are as they were but nothing working as far as game play is concerned. I know bugger all about electronics but common sense seems to prevail as far as finding the problems but fixing them is another ball game. I am stumped and would appreciate some guidance Cheers
