Pittsburg, KS
Started a new thread first, but noticed this one has more traffic. Hopefully you guys have some suggestions.
A few days ago I had a had an issue getting my sorcerer to start a game. Assuming it was a power supply issue, I tested the regulated 5 volt output and the 12 volt output. That all checked out, so I moved on to the diagnostic switches on the CPU board. I got an error code 4, which according to the manual is a bad game rom 2. A friend of mine had a burner and an extra 2732 chip, so I erased his rom completely with this UV light box that he had, and we burned the rom on to the 2732. I fired up the game and ran the diagnostic switch on the CPU board again, this time I got an error code 0, which I understand means the game is working fine. I still could not start a game with the start button. So I decided to do a switch test, at which point I realized I had a whole column out. Column 1 which contains the coin switches, the credit(start) button, and the tilt switches, as well as the reset high score switch. At this point I removed both of the column and row plugs on the main board, and shorted with a clip lead between each switch in the column. All of the switches activated at the CPU board. Next I tried looking for a bad connection of the common column wire to every switch on that column. I found a solid connection (.2 ohms) all the way through. Could a diode be shorted or open somewhere? If so, how would that take out a whole column? And what diode should I replace it with? Btw, the game works fine. If I short the switch by touching the leads to the back side of the molex connector that corresponds to the start game switch, I can play a full game without issues. Thanks for any suggestions.
