I know there is a lot of info on Data East coils, diodes and transistors. I have read everything I can get my hands on and would like suggestions. On a good note I did get my VUK coil working properly using these forums and guides.
My ball launch coil had a push button wired into it by the previous owner. Obviously a wrong repair technique. I replaced Q4 which tested bad and replaced the diode on the coil. The upstream transistors on the MPU tested good. The switch on the gun is still hooked up and seems to work as I can use it in the game to shoot the bad guys during video mode.
Long story short I am still frying Q4. I wired the push button back in for the time being. I have tested Q27, Q19 and R70 on the MPU and they seem to test just like the transistors/resistors next to them on the board. around .45 on the transistor test (both legs). I have two more TIP 36C transistors here so I can replace Q4 again but until I find the culprit it is useless.
Any suggestions? I posted this under my restoration thread but no one responded today so I figure it is buried too deep for anyone to see.