Gottlieb system 3 fuse blowing auxiliary power supply

mikdawg

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Gottlieb system 3 fuse blowing auxiliary power supply

I have a Shaq Attaq that was working until I messed it up. I plugged in two connections (A27J2 and A10P6, probably for comm. adp) that should not have been plugged together. I blew both auxiliary PS fuses (F10, F11), replaced and blew again. With the fuses blown, the game boots up, attract mode runs, when you hit the start button the game acts like it is going to play but never gives you a ball. Also, when I recieved the game, on the driver board, in a line, D8, Q7, R68 were very toasty. I have replaced them. Not sure it that has anything to do with the fuses? Where do I start?

Thanks for the help.
 
i dont know to much about gottliebs.but i know on some of the other type power supplys when fuses blow it the bridge rectifer.so if the board has a bridge rectifier i would look into checking that.hope maybe i helped
 
I traced the line out and I have a bad resistor but I am also worried about the audio amp that is next in the circuit. What is the correct method to test this amp.
 
I am pretty sure that a bad audio amp will not cause the game to not start. Unless you know something the rest of us do not.
 
Did you ground mod the game? I had a wipeout that had starting issues until I tied all of the grounds together.

Maybe unplug the sound board and start it, see what happens?

Mike
 
Well, i have updated the grounding issue. I have checked over the aux ps board and it test ok but the audio amp smells burnt up. Ordered a new one, see what happens. I did unplig that board and it does not blow the fuses when started so it must be that board. Correct
 
Soldered in the new audio amp today. The old one was not looking very good. Flipped it on, started right up (everything worked), played about a minute or so and then the speaker had a lot of feedback through it. Turned it off and back on a again to find the game played but no sound. Checked the aux power supply fuses and they were blown, again? Thoughts???
 
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