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Voicecard problem - very high pitch transposition

Voicecard problem - very high pitch transposition

2014-10-30 by pyjamagroove@...

Hello,

I have a problem with my voice card 8 on channel 1. Sometimes it plays normally, but sometimes the pitch goes way up like it's transposed. When I hold the key depressed it happens too. Other voice card 8 (channel 2 ) is fine.

The problem is very random - comes and goes even when the synth is warmed up.

I have checked the pitch trim pots and they seem to be ok (cleaned them just in case). 

As I understand the KAS and SH boards are responsible for whole voices, not single voice cards, they are not the problem. I am slowly getting out of ideas what it might be.


Re: [yamahacs80] Voicecard problem - very high pitch transposition

2014-10-30 by Florian Anwander

Hello,

Am 30.10.2014 15:48, schrieb pyjamagroove@... [yamahacs80]:
> I have a problem with my voice card 8 on channel 1. Sometimes it plays
> normally, but sometimes the pitch goes way up like it's transposed.
Does it go one octave up relatively to the actual setting?
Or does it go up like you would set the synth to "transpose up"?
Or does ot go much over the the standard 1 oct. up value?

If it is only like 1 octave up, then I would check/resolder the solder
joints of the complete transposition section of the voice card (around
TR1-4, FET1-4, IC7, TR5).

If it goes up much more than the standard maximum, then more assumingly
some supply power or some ground is missing around the VCO circuit.

Florian