xray2
Member
Can someone with one of the original Gottlieb System1 sound boards measure the voltage at the point show in red on the schematic for me. I am trying to help out a buddy but have no reference point for a working game.
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Yea Lindsey, my estimate was 11.5 under load but wanted to get a real world reading. Not looking to reproduce these so have at it.
I could still use a measured value from someone with a working board.
I am helping someone remotely and do NOT have access to the board. Some of the information I receive is contradictory so I am double checking the data.
The board is comprised of cmos parts with a voltage range of about 4.5v to 18v so a half volt one way is no big deal.
A voltage drop across the power feeds on the LM380 power amp would make a difference.
I honestly believe there may be nothing wrong with this board and the 24VDC power supply may be at fault.
The 24VDC would have to vary widely for the 11-13VCD to be impacted here. Faulty wiring harness or connector is starting to sound like a high probability.
I sure wish all my friends had scopes, logic analyzers and the training to use them but unfortunately they simply do not.![]()
but the power supply troubleshooting can be done with a $5 meter.
The problem is most likely with the cheap $5 meter in use. As you know, low cost DMM sample at a much slower rate than a quality meter. The voltage is averaged out and can swing wildly when not on a stable signal.
I do appreciate all the suggestions and bumps in the thread. Hopefully someone will offer up a measured value from an actual board under load. I have never owned any gottlieb pin and do not have access to this one so it's a pain.
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