outrun boards

mike11

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I have a paor of OR board here that are busting my balls, lower boards good thats verified with another set........heres the deal , dogs barking, i bypassed that to troubleshoot, both 68000 are good all roms are good, epr10380-10383 main prog show no activity on them, sub prog does have activity on the ad lines.... this just displays garbage in the screen ..... tried piggy backing rams in the 130s no change ...... cpu are all high..... only activity i have on the cpu is FC1 flickering a garbage pattern , E has clean signal, HALT toggling garbage ugly signal.... wheres a good place to start with this ..... schem for this are hard to follow spread across 7 pgs

Thx
 
Jumping RAM only helps if its an open data bit. If its shorted, no go. I would stay with the RAM in Main and Sub CPU areas. Socket a good pcb if you have it and test both areas. Could also be corrosion? maybe bad buffer? Verify that 244 up above PGA near sound section is good too. I have seen a few of those bad.
 
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