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Audio In not working - microKorg

 
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monumentalfolly



Joined: 15 Nov 2016
Posts: 4

PostPosted: Sat Feb 13, 2021 2:44 am    Post subject: Audio In not working - microKorg Reply with quote

Audio in not working. Audio input is showing via LED, but no sound: either with Global Audio in Thru turned on, through the vocodor, or through the filter -- no sound from the external audio (or mic).

Synth works fine otherwise. . .

Tried a global reset to factory. Nothing.

HELP ! !

Jon
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OpAmp
Platinum Member


Joined: 07 Jun 2013
Posts: 1173
Location: Brussels, BE

PostPosted: Sat Feb 13, 2021 9:34 pm    Post subject: Reply with quote

Hi,

Do both inputs (Audio In 1 and 2) suffer from this issue in the Audio in Thru mode?

The fact that the led goes on indicates that the analog signal chain is at least ok till the ADC. From then on it becomes difficult to say...
It is very unlikely according to me that factory reset would have solved it. That would mean a software problem. I suspect rather a hardware problem...

Bye.
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monumentalfolly



Joined: 15 Nov 2016
Posts: 4

PostPosted: Sat Feb 13, 2021 9:38 pm    Post subject: Reply with quote

OpAmp wrote:
Hi,

Do both inputs (Audio In 1 and 2) suffer from this issue in the Audio in Thru mode?

The fact that the led goes on indicates that the analog signal chain is at least ok till the ADC. From then on it becomes difficult to say...
It is very unlikely according to me that factory reset would have solved it. That would mean a software problem. I suspect rather a hardware problem...

Bye.


Thanks -- yes, LEDs on both inputs. I agree with you. It seems like something is broken after the input, although it is weird that the audio thru doesn't work. I guess the circuit is INPUT > LED > THRU SWITCH and the break is right there. . .

[Sad non-Robot Voice.]

J
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OpAmp
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Joined: 07 Jun 2013
Posts: 1173
Location: Brussels, BE

PostPosted: Sat Feb 13, 2021 10:09 pm    Post subject: Reply with quote

Well, it is a bit more complex Smile

Input -> amplifier - ADC - DSP - DAC - amplifier

The led is tapped somewhere in between amplifier - ADC.

The audio thru switch is a software loopback. Note that the ADC and DAC are housed in the same chip.

If you are familiar with electronics and have the right equipment you can open it up.

But it sounds like something broken, not sure it will be possible to repair it. Sad
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