Korg Forums

danatkorg · Posted: Wed Oct 28, 2015 8:41 pm Post subject:

As a first step, before contacting a service center directly, I'd strongly encourage you to contact your national Korg Distributor - see the link in my signature. They may be able to help you to diagnose further - and it's always possible that it won't require a repair after all.
_________________
Dan Phillips
Manager of Product Development, Korg R&D
Personal website: www.danphillips.com
For technical support, please contact your Korg Distributor: http://www.korg.co.jp/English/Distributors/
Regretfully, I cannot offer technical support directly.
If you need to contact me for purposes other than technical support, please do not send PMs; instead, send email to dan@korgrd.com

mintjamman · Posted: Thu Oct 29, 2015 8:26 am Post subject:

You state Korg UK does not sell parts any longer ?

There must be parts available for customers which would include users and techs or do you mean that Korg UK like Yamaha UK have farmed out spares to a third party?

BobTheDog · Platinum Member Joined: 21 May 2007 Posts: 1535

Are you absolutely sure it is not noise being injected from the analog ins?

tcornishmn · Posted: Tue Nov 03, 2015 7:43 pm Post subject:

Seems to me this problem was likely caused by the Kronos being connected via 1/4" TRS to XLR cables to a sound system with phantom power turn on for the Kronos inputs.

As others have mentioned, using a DI box or other isolating device is a good idea.

francopiano · Joined: 02 Jun 2009 Posts: 32 Location: italy

I have the same problem.
if I keep the volume control under half I have no distortion, (except some electric piano), but over half of the volume, any sound distorts.
I also contacted Korg italy, to which I have uploaded some files with the records will sound which clearly shows the distortion, but I did not have important information, if not get the keyboard into a service center for testing.
Currently, I'm using it .... I avoid exceeding the 50% of the volume .... and everything works.
I had a oasys76 earlier, another sound...much better

danatkorg · Posted: Wed Nov 04, 2015 4:34 pm Post subject:

salomao · Joined: 27 May 2011 Posts: 49

salomao · Joined: 27 May 2011 Posts: 49

Rigel · Posted: Tue Dec 01, 2015 8:09 pm Post subject:

..then it is clear that the distortion stems from your signal path or your electromagnetic environment.
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Korg KronosX73, Kurzweil PC3K6, Roland V-Synth GT, Kawai K5000S, Waldorf Blofeld, Novation Ultranova, Behringer Neutron, Yamaha HS80M, Boss Micro BR80, Zoom H6, Sony PCM D100, Tascam DP32SD, Mackie 1202VLZ4, Zoom MS-70CDR, Rode NT1, Sony MDR 7506.

jantoman · Joined: 13 Jul 2011 Posts: 12

My Kronos 61 1st gen began to generate distorsion years ago. A friend told me he had the same Kronos, so I went in his studio where we recorded both keyboards using a french horn sound that showed the distorsion pretty well: we recorded four audio tracks, from L-R analog out and from digital out. The latter were quite identical, while the analog track from my keyboard was apparently distorted. Back in my home lab I found out the issue was in KLM-3005 board, specifically in the Mute circuit: that was rather easy, but then I went nuts trying to spot the faulty component... until I got the chance to check a good KLM-3005 from another Kronos and measured on Q606's collector a negative 12v tension... on my board that tension was oscillating from -5 to -8 volts. I already checked that bloody transistor many times, with different measurement devices (multimeter, scope, transistor tester...) and it seemed ok... but it was definitely faulty. When I finally replaced it with a new one, I got back the proper -12v on the collector and the distortion was finally gone. That was hard...
If your're interested to check it out, the Mute circuit is shown on page 21 of the service manual.

KK · Platinum Member Joined: 13 Oct 2016 Posts: 1422

Drummond · Posted: Sat Oct 22, 2022 9:44 pm Post subject:

It is sold together with 3 other jack boards, in a common PCB in which you detach the pieces you need. KLM-3005/6/8/9 In Brazil, from Korg's official partner, I paid around 230 dollars.
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Korg Kronos 88 (288gb+3gb), Korg Kronos X 61, Alesis Fusion 6HD (60gb+384mb), Hammond XK1c, Moog Slim Phatty, Behringer Model D, Access Virus B, Oberheim Matrix 1000, Novation X-Station 61, Korg Trinity Pro (with Solo-Tri), Compac Univox II, Casio MT600 and PT82.

ehasting · Joined: 12 Oct 2023 Posts: 1

I am experiencing the same issue and was thinking ordering up a new board.
is it easy to replace? or does it need soliding

(i am currently using the optical to a DA converter)

Rgs
Egil Hasting