Eight Ball. Alltek mpu. Worked for over a year. Failed. Boots fine, 30 sec in fails. (No displays locks up) Turn off - then on fails after first horse race chime. Wait a few minutes and it give you 30 seconds of play. Sent board in to Alltek. Bad 6800 microprocessor. David said he'd never seen that before. Board back installed. Worked good. For a couple of days. Good news is that Marco has them, bad news is why is this chip taking a hit. Any thoughts? I can't decide if it's downstream (Diode) or upstream - driver regulator board.

Ken just got to Wizard mode!
So, as mentioned this machine had, to quote my favorite director, a "major malfunction" previously, because the microprocessor had failed which was fixed for free by Alltek. To my delight, upon turning it on today, there was no booting sequence at all, meaning this was not the same problem. Checked all voltages at the transformer module. All within spec. Checked at the regulator driver. 5 v not even close even before being regulated. Took connector out that feeds the 5 v to the regulator, cleaned and deoxed pins. Booted. Knowing that this is the trouble spot, I located the wire within the connector at the transformer module, took out the crimp connector and cleaned that. Put it back, no boot. Replaced that crimp connector with a trifurcon and is all well now. The back of this board was taken out about a week ago and carefully inspected for any cold solder joints, anything suspect was reflowed as, I was trying everything to find the original cause. The final reason to ship the MPU out original was, I put it in another game and after booting it locked up a chime coil. So, at that point I knew it was in the Alltek MPU.