Gorgar
Williams, 1979You're currently viewing posts by Pinsider tuukka.
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Re-check the 5V. 10.4V sounds impossible if the game still boots. All other voltages are OK. The flippers locking on is also strange, since they are not CPU controlled.
The sound board is controlled by driver board solenoid outputs. You might have some problem in solenoid driver circuitry (bad 7408 or PIA). But swapping boards should make it easy to locate the problem at board level.
Don't put any known good boards into the game until you verify the 5V to be correct (4.75 - 5.25).
Quoted from Brewchap:I was measuring at the fuse holder F5 to get 10.4v. So I measured at 3J6 this time and found that I have 4.78v. I tested on the 5V test point on the CPU and it had 4.75v.
So your power supply is OK. The 5V could be a bit higher, but 4.75 is still in specs.
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Franklin, VA