[sdiy] Korg DW-8000 power supply help?

[Eric Frampton]

Hi all -

I'm trying to troubleshoot a failed Korg DW-8000 power supply. Disconnected from any load it pops fuses as soon as it's powered up. I started with the bridge rectifier, it's fine; while it was removed I checked the xformer, it's fine. There doesn't appear to be anything irregular (trace damage, burns, blown bits, etc.) on the board.

Do you guys have any techniques you can share for where I might start with this thing, since I can't power it up at all? It's not like there's just one rail down and I can fire up the rest of it to test.

And yes, I realize I'm dealing with potentially lethal voltages and I won't hold any of you accountable if I screw up my own handiwork.

Thanks,
Eric