wugly
Well-known member
sometimes you never figure it out. was working on a taito 3 board version with the power supply that shall remain nameless since no one has ever seen a schematic for it. I screwed up and accidentally bridged 12 volts to 5 volts. took about 2 days to run down the faults I put into the boards. one was truly bizarre that allowed the test to work and give me bad ram for the taito self test but the braze test never worked. It had a shorted address decoding line. The power supply took me 3 weeks to fix and I never figured it out. regulators and power transistor were shot but I still got double voltage when they were replaced. Got desparate and pulled the large filtering cap off the board to test it, it was good and I put it back and the power supply functioned properly. 2 years later and its still good and I still have no clue why.


