Protection circuitry on mufi kw500--help?


We are not original owners of a mufi kw500. I believe it was 6 years old when we bought it in pristine condition.
Yesterday we had the unit on for 8 hours straight--3 hours sitting waiting for our company to be ready to listen, then 4-5 hours of rock. We played james gang, mumford & sons, wishbone ash, billy cobham, three dog night--our company loves drums and guitars. So it got quite a workout. We had just started deep purple smoke on the water, turned the sound up from 11:00 to 12:30 position-- when we lost the left bank, and the protection circuitry???? Kicked in to lower the volume. The legs went purple.
We turned the system off for a few minutes, then back on. It powered on, then immediately turned purple legs again.
It smelled a little electrical burnish. But not strongly so.
We tried a power up two hours later--same thing--powers on and goes to purple.
Is there a home reset option for the protective circuitry?
Has anyone else run into this? How was it fixed and what did it cost?
Any thoughts would be appreciated.
Obviously the unit isn't under warranty.
We will call the musical fidelity folks for ideas, also.
My husband is a mechanical engineer, and is willing to tackle the issue if we could find some schematics.
Thanks, folks.
Associated gear:
Clearaudio Revolution TT
ARC ph3SE
Tara lab interconnects
MIT z-series power conditioner
Vienna Acoustic Beethoven 4 ohm speakers
MIT 750 series 2 biwired with cvt speaker wires
REL Strata iii subwoofer
Mufi kw500 with RSA duke power conditioner
3 dedicated lines--one for mufi, one for subwoofer,
One for TT-associated equipment.
Rel is run by mufi in 2.1 mode.
5.1 additional equipment was turned off--Yamaha rxv1, Vienna acoustics mozarts speakers w MIT speaker wire and mufi 550ks.
Thanks for helping us!!
Deb
deebarnes

Showing 4 responses by deebarnes

We are disconnecting in "waves" since so much is connected. We started with speaker wires coming off. It still goes to purple immediately on startup.
Soren and Al,
Thank you for the input.
When we unhooked the sub and the interconnects, she did her full startup routine, then after 15 seconds went to purple feet.
After speaking to the mufi repair center, he got permission to open it and take a peek. Looks like we blew a teeeeeny capacitor on a board in the left bank.
So we are packing up for a repair.
We think that we pushed theREL sub too hard, and the extra wattage reflected back into our amp. Grrrrrrr.
Anyways...no audiophile amp for a few weeks, but we didn't kill our kw500. Only made her limp a little.
Looks like we will use line-level interconnects with the sub from now on.
Oh well...learning curve!
Deb
I called the national sales office who referred me to a repair facility on the east coast.
Talking with Brett, he sounded knowledgeable and experienced.
Will let you know how he does. And will pass along his info if we are happy.
As for hums--no hums at all from anything when all was working "properly".
I guess we will use the line out for the subwoofer next time.
Bummer.
Deb