After doing some troubleshooting on a MK2 board I bough as faulty I somewhat have it up and running after socketing uj11, jumping wires from MAX691 Vout to UJ11 VCC and also jump a trace between UJ19 and UJ20 (roms) it reports no errors, and it also says the cmos checks out. The attract mode seem to play, and I can do all diagnostics tests etc.
However sometimes I'm not able to press start button and get it to start, other times it will start a game, but you can't move, or you can move and play 1 round, before it changes your player to the same as the opponent it seem and you might get to somewhat play round 2 before all is stuck on round 3 again (both you and the CPU just stand there).
From the schematic (if I understand it correctly) there should be a low resistance trace from pin 6 og UG7 to pin 27 of UJ11, on my board it seem to be more or less broken (very high resistance) - may this stuff cause such behaviours ?.
Any tips on what one might check out would be appreciated.
However sometimes I'm not able to press start button and get it to start, other times it will start a game, but you can't move, or you can move and play 1 round, before it changes your player to the same as the opponent it seem and you might get to somewhat play round 2 before all is stuck on round 3 again (both you and the CPU just stand there).
From the schematic (if I understand it correctly) there should be a low resistance trace from pin 6 og UG7 to pin 27 of UJ11, on my board it seem to be more or less broken (very high resistance) - may this stuff cause such behaviours ?.
Any tips on what one might check out would be appreciated.
