Pulled the L+R on the M50 and killed it

combusean · Post by **combusean** » Tue Dec 28, 2010 10:55 pm

I guess it's simple as that: crap happens.

I wasn't paying attention and forgot the thing was on and was underneath it rerouting cables. I pulled the L and R audio jack at the same time and my amplifier cracked and the M50 died right there.

The light on the AC brick is on, but the M50 just doesn't turn on.

I'm wondering if this is self-serviceable? I've been given a quote for a $250 deposit on a repair at the local shop by my house. I'm actually looking to sell it to raise money for an equipment shuffle so ...

Any advice?

akmon · Post by **akmon** » Tue Dec 28, 2010 11:03 pm

So, if you pull L and R audio jack toghether it fries your M50? The strangest problem I´ve ever read, I would like to know more about it.

DoctorMo · Post by **DoctorMo** » Wed Dec 29, 2010 1:23 am

Yeah, this is too weird. If this unit is still under warranty, send it back. I'd say it is the bad capacitor problem that just happened to show itself when you unplugged those cables.

There should be absolutely no reason you can't unplug the cables while the power is on.

Elektroman · Post by **Elektroman** » Wed Dec 29, 2010 2:07 am

Amp crackled?
Did you by any chance touch the 2 (L and R) together while unplugging them?

Jonno · Post by **Jonno** » Wed Dec 29, 2010 5:17 am

Could it be a <a href="http://en.wikipedia.org/wiki/Ground_loop_(electricity)" target="_blank">ground loop</a> problem?

DoctorMo · Post by **DoctorMo** » Wed Dec 29, 2010 5:57 am

Unplug then reconnect the little power plug in the back of the keyboard. We have noticed that although it appears that the plug is pushed in, it takes some wiggling.

Korg made a mistake by not using a better plug on this keyboard. It should have been an IEC connector and not a tiny, sorry, little plug.

mike

combusean · Post by **combusean** » Wed Dec 29, 2010 4:27 pm

Jonno wrote:Could it be a <a href="http://en.wikipedia.org/wiki/Ground_loop_(electricity)" target="_blank">ground loop</a> problem?

Thank you for the suggestion. The Behringer amp I had it connected to has been finicky, and the wiring in this house in the walls (1943 era) and out (2 surge suppressors) probably doesn't help things. I got horrible noise just connecting USB cables from the M50 with the amp on.

(note to self: do not overlook power conditioning ... )

Any idea what a capacitor *should* cost to fix from a local servicer, presuming it's that?

DoctorMo · Post by **DoctorMo** » Wed Dec 29, 2010 5:33 pm

I'm not sure about the cost to replace the caps. Ours was under warranty and we had it fixed within a couple of days, since the repair guy was local.

mike