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Discussion about the Korg PolySix synthesizer

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KLM376A1-PS delivering undervoltage at test points

2014-03-03 by tim p

In my ongoing P6 power supply saga, have got UK transformer hooked up ok but test points are reading

+5 = 3.6
+15 = 10.8
-15 = -10.7

Is this likely a problem with the transformer or more likely the voltage regulating components on the 376 board? Rectifiers shot?

Have tried adjusting trimpots but that does not make result in a noticeable voltage difference on the test points.

Have tested the two main Caps and they are within tolerance.

Any help or ideas appreciated.

Cheers

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