Korg Forums Forum Index Korg Forums
A forum for Korg product users and musicians around the world.
Moderated Independently.
Owned by Irish Acts Recording Studio & hosted by KORG USA
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Buzzing when Kronos is connected, while off

 
Post new topic   Reply to topic    Korg Forums Forum Index -> Korg Kronos
View previous topic :: View next topic  
Author Message
zarquon



Joined: 14 Jun 2017
Posts: 1

PostPosted: Wed Jun 14, 2017 3:35 pm    Post subject: Buzzing when Kronos is connected, while off Reply with quote

Hi all,

I just bought a Korg Kronos and there is a buzzing sound coming from the PA speaker so loud that it renders it unusable in a live performance. The buzzing comes even when the keyboard is turned off and starts the moment the ground pin is connected to the ground socket. The buzz continues even when I connect via a DI box. Lifting the ground on the DI box lowers the buzz slightly but does not eliminate it.

You can watch a Youtube upload of this phenomenon here.

I should add that I have many other keyboards and synths (all Nords) and there is no buzzing associated with these keyboards.

On occasion when I touch the metal panel I also feel a tingly sensation - I think I might be getting slightly shocked.

Appreciate your help in diagnosing this problem. I intend to bring it back, but this is heavy and I want to make sure I have the right information before going.
Back to top
View user's profile Send private message
geoelectro
Platinum Member


Joined: 14 Sep 2012
Posts: 826
Location: Texas

PostPosted: Wed Jun 14, 2017 4:07 pm    Post subject: Reply with quote

I suggest you have a ground problem. Had something similar with my Kronos. Changed out the power cable and was OK. Seemed like the cable didn't fit tightly in the back of the keyboard. Do he anode use a three wire grounded power cable? If so, that's a weird problem. If not, it could be due to building wiring. Grounding problems are common and sometimes hard to track down.

Geo
_________________
Kronos 61 : 3GB RAM 120GB 2nd Drv.
Kronos 2 61
N.I. Komplete 7, Omnisphere 2, VB-3.
HP i7 8GB Win 10
Yamaha P-80 Weighted Keyboard. NanoPad2
Back to top
View user's profile Send private message Visit poster's website
GregC
Platinum Member


Joined: 15 May 2002
Posts: 5857
Location: Discovery Bay (San Francisco Bay Area)

PostPosted: Wed Jun 14, 2017 4:10 pm    Post subject: Re: Buzzing when Kronos is connected, while off Reply with quote

zarquon wrote:
Hi all,

I just bought a Korg Kronos and there is a buzzing sound coming from the PA speaker so loud that it renders it unusable in a live performance. The buzzing comes even when the keyboard is turned off and starts the moment the ground pin is connected to the ground socket. The buzz continues even when I connect via a DI box. Lifting the ground on the DI box lowers the buzz slightly but does not eliminate it.

You can watch a Youtube upload of this phenomenon here.

I should add that I have many other keyboards and synths (all Nords) and there is no buzzing associated with these keyboards.

On occasion when I touch the metal panel I also feel a tingly sensation - I think I might be getting slightly shocked.

Appreciate your help in diagnosing this problem. I intend to bring it back, but this is heavy and I want to make sure I have the right information before going.


trouble shoot by using another amp.

And don't blast the Master volume. Keep it at 10:00- 11:00

And it sounds like you have bad grounding problem. It might be the Kronos - it might be something else. It could be a poor AC power cable - or its poor ly seated. Don't mess with at too much. It sounds dangerous.

If you are certain its the Kronos, you have to go back to the dealer as its defective.

You really should use headphones to isolate the problem with audio.

Finally, you have mic/line outputs in the back panel. See the dials. Set them to Zero. That black button should be depressed so you are in " LINE ". The mic position will greatly amplify and over load the audio.

I assume you have read the Quick start guide ? Kronos is not a simple board.
_________________
Kronos 88. nanoPAD2. MBP
Achieve your musical dreams Smile
Back to top
View user's profile Send private message Send e-mail
SanderXpander
Platinum Member


Joined: 29 Jul 2011
Posts: 7860

PostPosted: Wed Jun 14, 2017 5:51 pm    Post subject: Reply with quote

Actually it's generally best to put the master volume quite high because then you can keep the gain on the mixer and amp lower, leaving you with a far better SNR.

Sounds like a grounding issue, definitely. Try what geoelectro suggested and otherwise get it checked out by a qualified tech, it could be dangerous for you and anyone using the equipment you're connected to.
Back to top
View user's profile Send private message
voip
Platinum Member


Joined: 27 Nov 2014
Posts: 1094

PostPosted: Wed Jun 14, 2017 6:10 pm    Post subject: Reply with quote

Doesn't sound like mains hum. The sound is extremely faint in the recording, and may actually be one of the other switched mode power supplies connected to the distribution board going bad e.g. exhibiting excessive earth leakage. Also, is there a wireless charging device in the vicinity?

.
Back to top
View user's profile Send private message
Schmooster
Full Member


Joined: 13 Jan 2007
Posts: 234

PostPosted: Mon Jun 19, 2017 1:14 am    Post subject: Reply with quote

That sounds like damaged insulation - swap out that mains lead or insulate the ground pin to test. The frequency is also very high, almost Bluetooth carrier high, certainly not mains. I'd start with that cable.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Korg Forums Forum Index -> Korg Kronos All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group