Gottlieb Stargate Aux driver board problem

wrongdon

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My Stargate pin boots to random garbage on the dmd and beeps unless i unplug P1 (input) side of the aux driver board . With the aux driver board unplugged it boots fine and plays just as it should minus the flash lamps that it drives . I have been tracing wires for what seems like forever from the output side to the lamps when it hit me to leave the input side plugged in and unplug the output side . With P2 output unplugged and P1 input plugged in the game still boots to random garbage and beeping . This tells me it is not a wiring problem on the output side as suspected but rather a problem with the board itself or maybe an problem on the Mpu that is causing a conflict . The drive transistors test good .
Any ideas to isolate the problem further ?
Thanks folks .
Don
 
Sold my stargate yesterday so I probably will not be much help....all the connectors in the right place? I only ask because I did that when I pulled the driver board. Think I actually left a ribbon unplugged but it wouldnt boot and I about dropped a loaf in my pants.
 
The connectors are in the correct locations . It has worked in the past and just up and quit . I am fairly confident it is this board unless some strange mpu problem causes the mpu to reject this board . This looks to be a cheap board , i'd buy one to swap in but can't find any . I did find the lone ic , a N74HC273BI on Ebay for a buck a piece , so i may order one of these and replace it .
Funny , mine is as good as sold as it sits , but i would like to fix this before it goes .
Thank you for your input .
Don
 
Problem solved

Just wanted to add closure to this thread . I replaced the chip on the aux driver board at location U1 and it works fine now . The chip was a 74HC273 . What originally threw me off on all of this is it seems to be popular opinion that the machine will act this way if U11 on the mpu is bad .
Don
 
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