Please help Urgently! Korg M1 noise level

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sam5980
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Please help Urgently! Korg M1 noise level

Post by sam5980 » Fri Jun 19, 2020 11:57 am

Hello everyone!
I bought a Korg M1 from ebay. When I connected to my sound card I have around -65 db noise. It does not matter to which ones of the 4 outputs I connect to. I appreciate to know what is the normal noise out put of Korg M1
I noticed if I connect the M1 directly to my monitors I have no noise.
I am using E-MU 1616M sound card and the interesting part is that I connected to keyboards into it. The first one does not have any noise when I connect it but the M1 has this noise. Even if I unplug the first keyboard and connect its cable to M1 again noise appears. Sound looks like a ground problem but I do not understand why.
When I am using the M1 directly to the speakers and I use the same input voltage cable that has ground I have no noise (however when I press a key, beside of the instrument sound there is a low noise into it which I also do not know if it is natural in M1 or not) but as soon as I connect it to sound card high noise appears

Thanks
Best regards,
Sam

Rasputin
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Re: Please help Urgently! Korg M1 noise level

Post by Rasputin » Sat Jun 20, 2020 3:59 am

sam5980 wrote:
Fri Jun 19, 2020 11:57 am
I also do not know if it is natural in M1 or not) but as soon as I connect it to sound card high noise appears
I am going to assume the M1 and the computer/audio interface (sound card) are plugged into the same electrical circuit in your residence.

There are a couple things you can try:

- Power the M1 or the computer on a complete different circuit (extension cord to your neighbors?)
- Use something with an isolating transformer? Furman power conditioner? APS unplugged and on battery?
- Ground lift the M1 (temporarily) -- you know, those "cheater" plugs with only 2 prongs for old houses.

If any of those remedy the situation then you can suss out a permanent fix.

sam5980
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Re: Please help Urgently! Korg M1 noise level

Post by sam5980 » Sat Jun 20, 2020 9:25 am

Rasputin wrote:
Sat Jun 20, 2020 3:59 am
sam5980 wrote:
Fri Jun 19, 2020 11:57 am
I also do not know if it is natural in M1 or not) but as soon as I connect it to sound card high noise appears
I am going to assume the M1 and the computer/audio interface (sound card) are plugged into the same electrical circuit in your residence.

There are a couple things you can try:

- Power the M1 or the computer on a complete different circuit (extension cord to your neighbors?)
- Use something with an isolating transformer? Furman power conditioner? APS unplugged and on battery?
- Ground lift the M1 (temporarily) -- you know, those "cheater" plugs with only 2 prongs for old houses.

If any of those remedy the situation then you can suss out a permanent fix.
Thanks!
I connected it directly to my speakers. I still have a noise when I press the keys + the fourth output has a buzz noise even without pressing any keys. By the way how much should be the noise of just plug the M1 in to a monitor? I could also hear a little bit noise when i plug it but when I press a key the noise is too much and somehow also it makes sound of the instruments distorted at the tail. I also found that After touch key does not working + the master tuning.
Do you have any idea how much cost it has to repair such problems? perhaps it has other issues that I am not aware of it.

Thanks for the feedback!

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Yekuku
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Re: Please help Urgently! Korg M1 noise level

Post by Yekuku » Sat Jun 20, 2020 5:04 pm

Hi and welcome to the forum.
The noise that you are describing could be a common issue for the M1.
A capacitor in the power supply and a resistor on the DAC board could be the culprit.
check this thread:
http://forum.vintagesynth.com/viewtopic.php?t=53799
It is all about sharing...

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