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I have a spare MCR Panning board that I had CDJump rebuild and it will not boot the sound board without hitting the reset button in my EDOT. I have my scope on pin 26 of the Z80 and I see the reset every time and my primary Panning board looks identical on the scope. I have swapped CPU, 8910s, and tested the 7407 and everything is good. All have new sockets.

My 5 volts coming out of the 90412 is 4.8 and I cannot adjust it at all as it does not change when the board is plugged in. The 12 volt side adjusts. With the board unplugged it will adjust. The 5 volt rail on the Panning board is getting 4.6 volts and the reset pin is 4.7. If I power off the game and turn it on within 30 seconds it boots fine.

Looking for suggestions on what to look at next.


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