Synthesizer power supply

pilli

Member
2006-08-15 9:46 pm
There must be something downstream that pulls too much current, a short of some type.
Coincidence: I had something like that on a Yamaha something, and it was a bad tantalum cap that would systematically kill the 5V rail. Not easy to detect, if I remember correctly, I traced the rail out of the regulator, looking for causes.

You're not saying anything about regulators: check those first next thing.

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When I first glanced at it. It had a peculiar appearance to it but as it turns out it is fairly straight forward in design. I ran out of fuses while testing it but I swapped in new 7815 and 7915 and all new caps for the 15 Volt section. Still losing fuses in the 15 V section so I think the 5V is shorting it. Think I will spend some time today.
Thanks