Hello, I have Taxi machine that doesn't boot up on first try. If I leave it on it makes distorted noises and I have to flip the power switch twice for it to boot up correctly. I rebuilt the power supply hoping that would fix but it still does this. Anyone have a idea what is causing this? Thanks in advance for the help
You need to measure the 5, -12 and 12 volts on the power supply when first turn on the game. Can you report the voltages please?
Need to see if it is a voltage problem first.
What all did you do to "rebuild" the power supply?
No. Can't be the power switch if there is some life when you turn on the game.
Capacitors are one reason power supplies fail, but need to know what the voltages are to determine where to go next.
Quoted from lu505:I'll give that a try, so the c30 on the mpu right?
22uf axial cap to the left of the battery holder
Quoted from PinballManiac40:To me, it was looking more like a blanking issue, assuming the voltages are in spec.
This. I'm working on a taxi with similar issues. New ps board. No blanking lite sometimes...
https://groups.google.com/g/rec.games.pinball/c/VYCEd9xcAMA
Quoted from Cheddar:This can happen if C30 in the reset is bad. You can test it by clipping a new cap of the same rating to it. If it works replace the cap with the new one
Thanks, I did this and it looks like it fixed the issue!
Quoted from lu505:So if blanking is a issue replace U43, Q50 and C58. ill do some probing tonight and give some more info into what I find.
Slow down. Start with measuring the voltagea before worrying about a next step.
The capacitor in that circuit is the most common failure.
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