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Korg M1 motherboard fault, no sound.

 
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shirreff
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Joined: 05 Sep 2009
Posts: 149
Location: Northumberland UK

PostPosted: Wed Jun 21, 2017 10:13 pm    Post subject: Korg M1 motherboard fault, no sound. Reply with quote

Hi,
I've got 2 M1's. One fully working the other not producing sound so I swapped parts and narrowed it down to the mother board sadly.
Does any one have any ideas on what might be the problem?
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Mellontikos
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Joined: 01 Feb 2012
Posts: 96

PostPosted: Wed Jun 28, 2017 3:47 am    Post subject: Re: Korg M1 motherboard fault, no sound. Reply with quote

shirreff wrote:
Hi,
I've got 2 M1's. One fully working the other not producing sound so I swapped parts and narrowed it down to the mother board sadly.
Does any one have any ideas on what might be the problem?


Those old boards are known for faulty filter caps on the analog side of the DAC.

Could be the DAC, could be the OP Amps, or it's filter caps, or both. You might not be able to see physical damage.

Not producing sound at all could be caps completely toast, either leaking or dry. Got pics of the insides?
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shirreff
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Joined: 05 Sep 2009
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Location: Northumberland UK

PostPosted: Wed Jun 28, 2017 4:28 am    Post subject: Reply with quote

Hi,
Not got any pics at the moment but I cannot see any damage. I've had a good look. I'll send some pics asap.
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shirreff
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PostPosted: Wed Jun 28, 2017 7:08 am    Post subject: Reply with quote

https://drive.google.com/folderview?id=0BxP0r1LaooMpeG9ZQjVYZGRjU0k
Not sure how to upload pics on here so I've put them in my Google drive.
See if you can view from there.[/url]
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voip
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Joined: 27 Nov 2014
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PostPosted: Wed Jun 28, 2017 7:42 pm    Post subject: Reply with quote

Looking at the pics, there's nothing that really stands out as a potential problem, apart from in IMAG0184.jpg, near the top of the image, IC36 has what looks like possibly a piece of fine wire amongst its pins, which would cause problems, although it's more likely to be be a fabric fibre catching the light.

Is it possible the backup battery has been changed but the factory data not restored?

.
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