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Feather
Joined: 01 Aug 2019
Posts: 9
Location: NE USA
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 Posted: Wed Aug 07, 2019 1:33 am Post subject: KronosX Audio board is Ka-Poot |
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| Finally got a chance to remove the KLM3363 audio board. Didnt have the time or money to have (local)KASC repair it. In the meantime I’ll be using my trusty M3. Can someone on this forum recommend someone reputable so I’m not wasting money on replacement parts. If this is a design flaw with Korg, ill deal with that later. |
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19naia
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Joined: 29 Nov 2012
Posts: 1216
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| Posted: Wed Aug 07, 2019 3:43 am Post subject: |
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Sounds like audio output issues are starting to come up more often lately.
Mine started earlier this year or late last year.
And i think my ownership is only at the 4 or 5 year mark.
I bought Kronos thinking it would be a 10 year rig with the potential to go 20.
I still think that 10-20 years is possible but not without repairs every few years, and hopefully not turning into a discontinued parts dead end before the 10 or 19 year mark. |
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GregC
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Joined: 15 May 2002
Posts: 9451
Location: Discovery Bay (San Francisco Bay Area)
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| Posted: Wed Aug 07, 2019 3:48 am Post subject: Re: KronosX Audio board is Ka-Poot |
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| Feather wrote: | | Finally got a chance to remove the KLM3363 audio board. Didnt have the time or money to have (local)KASC repair it. In the meantime I’ll be using my trusty M3. Can someone on this forum recommend someone reputable so I’m not wasting money on replacement parts. If this is a design flaw with Korg, ill deal with that later. |
A design flaw would have been fleshed out 8 years ago.
Likely a buggy component.
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Feather
Joined: 01 Aug 2019
Posts: 9
Location: NE USA
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| Posted: Sat Aug 10, 2019 1:48 am Post subject: |
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| Greg ive never had an audio board fail on a Korg synth since my first M1 purchase in (1988). While the Kronos is a powerful tool for musicians, i believe more focus should have been spent on engineering a better solution for the analog audio stream. I suspect the mute transistors used on “some” early AND X models have caused the symptoms ive explained. The customer should not be the proving ground. 4 other local KB players have had same issues. Appreciate your support. |
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GregC
Platinum Member
Joined: 15 May 2002
Posts: 9451
Location: Discovery Bay (San Francisco Bay Area)
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| Posted: Sat Aug 10, 2019 2:25 am Post subject: |
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| Feather wrote: | | Greg ive never had an audio board fail on a Korg synth since my first M1 purchase in (1988). While the Kronos is a powerful tool for musicians, i believe more focus should have been spent on engineering a better solution for the analog audio stream. I suspect the mute transistors used on “some” early AND X models have caused the symptoms ive explained. The customer should not be the proving ground. 4 other local KB players have had same issues. Appreciate your support. |
that is a bad trend. I am not making any excuses for any co, especially on a $3000-$4000 keyboard.
The horses are wayyyyyyy out of the barn for re-engineering Kronos or Korg upgrading a component.
I see your design point , now. My contention, is that its a low quality component from a 3rd party. Or a bad batch. And Kronos owners have to tolerate the issue.
Korg service tech are the best ones to discuss flaws. I always recommend a serious 1/1 with them.
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Mike Conway
Approved Merchant
Joined: 28 Jan 2005
Posts: 2433
Location: Las Vegas, Nevada
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| Posted: Sat Aug 10, 2019 5:25 am Post subject: |
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| Feather wrote: | | I suspect the mute transistors used on “some” early AND X models have caused the symptoms ive explained. The customer should not be the proving ground. 4 other local KB players have had same issues. |
| GregC wrote: | | that is a bad trend. |
I hope it doesn't continue! 
My Mackie mixer has been out in the garage for months. Haven't needed it. I run all sorts of gear through my Kronos Line, S/P DIF, and USB inputs - OASYS, Virus TI, two Deepminds, a Boog, microphones, IPad, and the occasional guitar. Was sampling sounds from my E-MU E4 the other day.
Back when I had my Tritons, I did manage to fry the audio inputs, when I ran an ungrounded projector through them. The projector was playing fast, so I was using the Triton's pitch shifter to keep the audio sounding normal for some film transfers. Was working great until I blew the inputs. I did manage to get them fixed. There were a lot more techs to take care of my gear, 15 - 20 years ago.
Really sorry to hear about any issues. Did you by chance do what I did, which was blow the board by running something hot or not grounded through it? What do you usually plug into the inputs? You sound pretty tech saavy. I'll take your word on the mute transistors, but just curious if it was a "fry" issue. |
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geoelectro
Platinum Member
Joined: 14 Sep 2012
Posts: 1038
Location: Texas
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| Posted: Sun Aug 11, 2019 1:30 am Post subject: |
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As a keyboard technician the most common audio board failure (any brand) that I see is the accidental exposure to fantom power. Next, is connecting the keyboard to an audio device with ground problems either in the device or the building wiring. Fantom power will knock out the muting transistors for sure.
Geo
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GregC
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Joined: 15 May 2002
Posts: 9451
Location: Discovery Bay (San Francisco Bay Area)
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| Posted: Sun Aug 11, 2019 2:40 am Post subject: |
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What is Phantom Power and why do I need it?
Article #31340 Updated on Apr 27, 2007 at 12:00 AM
Phantom Power or +48V is a method of sending an electrical current through a microphone cable. It is most widely used as a power source for condenser microphones.
Condenser microphone capsules require preamplification in very close proximity. This requires a power source so that the signal can be amplified before traveling very far. In addition, true condenser microphones (as opposed to electret) require a voltage for polarizing the microphone’s transducer element. Phantom power provides a voltage for both these purposes.
Dynamic microphones do not require phantom power. Plugging a dynamic microphone into a preamp on which phantom power is enabled will neither affect the sound or damage the microphone. Ribbon microphones should never be plugged into a preamp with phantom power engaged.
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