Gottlieb System 3, sometimes start with problems

AE35

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Hey all!

Every once in a while(pretty often) my Stargate start up with garbled
display(random words and numbers) and a repeating squeaky sound, like
the normal boot sound, but repeated for ever, like it's trying to reboot.

If I wait till later, it'll work and boot normally. If I turn it off again, and on again,
the problem could be there..or not:)

Any advice??

Thanks,

Nicholas
 
Have you checked for proper voltage? I had the same problem with my system 3 (freddy) and the voltage would vary from start up to start up because the adjusting pot was bad.
 
Thanks!! I'll look into the grounding(!) and the voltages...which I haven't tested
yet!

Thanks guys!

Nicholas
 
Check for Proper +5 volts at the CPU board.
Because the Gottlieb System3 power supply has a 500 ohm adjustable trim pot for the +5 volts, it can get out of adjustment. It is best to test for proper +5 volts at the CPU board. Note there are no test points. Use the A1P1 connector (pin1=+5, pin4=ground). The voltage should be 4.95 to 5.15 volts DC. If it is outside of that range, adjust the A2 power supply trim pot. Note this trim pot is notorious for being worn out. Replacing it with a new quality trim pot is often a good idea. If +5 volts varies a lot on a game from time to time, suspect this trim pot as the problem
 
Thanks!

The +5V was at 5.15V, so I adjusted it to 5.05V...now I'll have to see
if it varies over time:)

Thanks,

Nicholas
 
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