Join Date: Jun 2006
Location: Old MIll Basin, Brooklyn, NY
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+12/-12V rails would be used in areas like low-level audio stages, protection circuit, relay drivers, and displays. Output stage/driver rails would be higher voltage. Defective supply components may probably have been bridge rectifier for the 12V rails, and/or voltage regulator(s) and/or associated parts. As mentioned above, these parts costs are minimal, probably no more than $5 or $10. Its the labor that gets you.