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Vintage Synth Repair

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Re: Octave Cat Rev A Schematics?

2013-03-14 by adhmzaiusz

I'm currently working on 3 Octave Cat SRMs.  I assume to some degree they are similar to the other rev's so I'll share a few things I've taken note of:
-The black 2k Tempco resistors go bad on these things.  Measure them first
-These 2k Resistors are glued to the SSM chips and CA3046chips covering what they actually are.
-There is one of the screws for the left side that needs to be shorter than the others when put back in.  In two of these cats someone put the longer screw into this place and it pushes the yellow axial .47uf cap into other components and breaks them.  Watch for this.
-When repairing the keys, it seems that the bottom jwire needs to leave the bus bar last when key off or it will trigger a lower pitch.

Thats all I can think of right now, hope this helps anyone.

Greg (ZAIUSZ)

--- In vintagesynthrepair@yahoogroups.com, "Boddington" <f115@...> wrote:
>
> I've had the SRM service notes for years but has anyone got schenatics for the earlier builds? I have a Rev A in front of me here and could use the schems for it. Gotta hand it to Octave though. Each IC is already socketed! Nice.
>

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