help! mosvalve mv-962 won't power up [solved!]

[turmoil]

the mosvalve is powered in a rack setup by a furman pl-8 power conditioner. I accidentally left the mosvalve switch in the on position when i turned the furman off the last time i was playing.
So, today i turned on the furman and the mosvalve made a quick pop noise as it turned on (it always does this), but i quickly shut the mosvalve off because i wasn't using it. By the way, the mosvalve DID have a proper load.

I thought nothing of it and continued to tweak some patch settings on my gforce. Later, when i turned the mosvalve on for my W/D setup, the amp did nothing. I pulled the AC fuse on the outside and it appears to look just fine. I tried powering the amp from a different outlet on the furman, but that didn't do anything.
I pulled the amp from the rack, opened it up, hoping to find a blown fuse somewhere and I can't find a single fuse anywhere else! I guess it just has one AC fuse that you can access from the outside.

I looked over the components and they appear to look fine as well.

So what do you think? I'm stumped right now. I may head down to radioshack and grab a new fuse just for the heck of it.

On a lighter note, I have been thinking about getting a fryette 2/50/2, so maybe it's time

Any insight would be greatly appreciated.
Thanks!

 

[turmoil]

update: bought a pack of new fuses and it still won't power up

 

[roadifier]

If you get a Fryette power amp, I'd be happy to take the mosvalve off your hands

 

[glpg80]

those mosvalves are not tubed, they are mosfet's. whole different ballgame to troubleshoot and bias. it could be anything, and i do mean literally anything. there is nothing you can do on the user end.

 

[turmoil]

those mosvalves are not tubed, they are mosfet's. whole different ballgame to troubleshoot and bias. it could be anything, and i do mean literally anything. there is nothing you can do on the user end.

Really? That just seems hard to believe...not doubting you, I just think it's crazy.
It's weird that the fan won't even turn on and the indicator light isn't getting any power. I might have to break out the dmm and step through the circuit point by point.

 

[glpg80]

those mosvalves are not tubed, they are mosfet's. whole different ballgame to troubleshoot and bias. it could be anything, and i do mean literally anything. there is nothing you can do on the user end.

Really? That just seems hard to believe...not doubting you, I just think it's crazy.
It's weird that the fan won't even turn on and the indicator light isn't getting any power. I might have to break out the dmm and step through the circuit point by point.

i think i have one of those mosvalve schematics, its not the 500W model, they are hard as hell to find since genz benz bought out the company and basically buried anything remotely dealing with mos-valve products and discontinued the amplifier all together. the one i found years ago is also hard to read.

IMHO the schematic i remember the fan i think runs off of the mains coming into the mains transformer. my memory is vague so i could be wrong, if you're not getting fan juice i wouldnt start at the secondary of the PT, i would check at the 120V coming in to the primary of the PT. possibly overshot the inrush current capabilities of the fan or a PTC and shorted + to neutral on the primary, and since you're running a furman PC its not shorting your circuit breaker in your house, the furman is just isolating it.

there is no false start circuitry or any delay on time protection, which seems to have caused the problem. just what i think it is.

 

[turmoil]

I figured i'd post this just in case someone ever has this problem again and is stumped like I was.

I checked out the pcb traces and everything looked fine...no burn marks or anything, anywhere. All the components looked fine as well.

I finished scewing the pcb back into the chassis and was about to get ready to take some voltage readings, but then, just for the heck of it, i decided to plug the mosvalve into a cab for a load, and then toggle the on/off switch repeatedly. After doing this for a few seconds, the amp came back to life!!

I am completely baffled right now, but i'm glad it's working again.

 

[mrkmas]