I grabbed a sub from a friend. Don't really need it but thought I would see if it was repairable. Almost new. He moved it to a new location and then it started blowing fuses as soon as turned on. I have completely removed and isolated just the amp and it indeed has a hard short and blows the fuse instantly. Simple resistance testing across the AC inputs shows .9Mohms and nothing seems to be leaking to ground but obviously something is leaking bad when energized.
Has to be something in the front power stage to be blowing fuses like this. I am curious anyone has amp repair experience? Is is possible that the bridge rectifier is leaking within itself? Never seen it personally but I have desoldered a few things and inspected it thoroughly and all seems well. Confusing. Basically power comes in, goes through some filter caps and buck transformer, then through the bridge, then another transformer, and out to the circuits.
I suppose it could be a transistor too but certainly no visual signs of issues.
Has to be something in the front power stage to be blowing fuses like this. I am curious anyone has amp repair experience? Is is possible that the bridge rectifier is leaking within itself? Never seen it personally but I have desoldered a few things and inspected it thoroughly and all seems well. Confusing. Basically power comes in, goes through some filter caps and buck transformer, then through the bridge, then another transformer, and out to the circuits.
I suppose it could be a transistor too but certainly no visual signs of issues.
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