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Vintage Synth Repair

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Kawai K1r

Kawai K1r

2014-08-06 by gonzinigonz@...

Hi all

Just picked up a K1r but i think it has an issue.

With any patch playing at the end of the release phase of the envelope i get a pop / thump.

It quite annoying, it you were to seq a number of short notes you would get a quick succession of pops after each note has sounded.
Anyone heard of this problem before?

Been looking for service data but closest i've found is the K1r ll which is different as far as i can tell.

Not pulled the lid off yet and get the scope to measure some stuff in the audio path to see whats going on.

Cheers

Re: Kawai K1r

2014-08-23 by gonzinigonz@...

It was my Motu 828mk2 oddly enough.
The K1r mutes its outputs with a simple transistor stage which shorts audio path to ground after the last output buffer, the Motu doesn't like that into its balanced inputs.
K1r always engages it a short time after the end of the release phase of the VCA.

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