switching power supply

[randywhatson]

Question...

Why did the operators use the old power supplies while installing switching power supplies?

Like the Galaga machine I'm trying to figure out...

The lines run through the old power supply. Why not just completely bypass the old power supply?

[darkcat1]

I believe the "quick fix" might apply here.  Alot of operators would do anything to get the machines back up as soon as possible because the longer they were down the less money they made

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[KennyL]

Another thing you'll see is just using the switcher to provide 12, 5 and sometimes -5 volts DC while the original power supply is giving some more obscure voltages or even AC.  This is something a collector or pro restorer would do, though, and what you're describing sounds like a quick fix as described above.