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AU-7500 blows fuse on power up, fix?

S

synthcity

New Member
I have an Au-7500 that one day wouldn't power up (I use it daily in my studio, but power it down daily too, maybe I won't after this... as I never power down my mixing desk)

Replaced the 4 amp 250V slow blow fuse and on power up, got power light for a second, then a click, and blown fuse. The 4 fast acting fuses are still intact, and I don't have any spares. Should I even bother replacing the other 4 fast acting fuses? I suspect there is a cap problem or something, but I'm not an electronics expert. Can anyone help me get up and running quickly again? TIA!
 
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My guess is that you have a shorted output transistor (or transistors) in one channel - that's usually the cause of what you're describing. Are you comfortable with going in and working on this stuff?
 
Just know that outputs rarely are the only devices to go up in smoke when they fail. You'll need to thoroughly check the driver board.
 
Thanks for the info everybody. Anyone able to step me through it- either in this forum or offline? Otherwise, it's off to the shop.
 
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