Discussion about the Korg PolySix synthesizer

It's either in the files section on this lists website on yahoo, or
there is a link to it in the section which goes to my website.

On Sat, Jan 17, 2009 at 10:09 AM, Andrew Jury <andy@networkjabber.com> wrote:
> Hi Wayne,
>
>> I am thinking that the problem lies in the output part
>> of the DeMux and was curious what the relevant CMOS
>> chips were for the signals that aren't showing up.
>
> I'll take it you haven't seen the schematic for this board? The CMOS
> logic types are clearly marked on the diagram. If you don't have it
> we can easily point you in the right direction of a copy. Some of the
> problems you mention are in the area of the IC19 (4051), but some are
> mearly switch functions and under control of the latches IC28/9 and
> IC34/5 (4042). Therefore I would suggest that you check the
> continutity of the tracks running from the mask rom (8048) P20-P27
> and the memory address bus DO0-DO7. Pay particular attention to port
> line P25 as it runs directly under were the battery has exploded. I
> find the best way to perform continutity tests is to print out the
> diagram and mark off the areas of track checked with a highlighter
> marker. If you want any comparative voltage / scoep waveform reading
> let us know.
>
> Let us know how you get on and if you still can't get anywhere then
> see post 1934.
>
> Cheers,
> Andy
>
> --- In PolySix@yahoogroups.com, Wayne Griffin <ingsoc_1979@...> wrote:
>>
>> I've been trying to help my friend repair his P6 which
>> was the victim of nicad leaks once again.
>>
>> I've carefully replaced and verified all of the traces
>> but I'm still having an interesting problem.
>>
>> The ENV and VCF controls behave normally.
>>
>> However, there is no response from:
>> OCT
>> WAVEFORM
>> PW/PWM
>> SUB OCT
>> LFO MOD
>> FX MODE
>> SPEED/INTENSITY
>>
>> I am thinking that the problem lies in the output part
>> of the DeMux and was curious what the relevant CMOS
>> chips were for the signals that aren't showing up.
>>
>> cheers! [w]
>>
>
>
>
> ------------------------------------
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6Yahoo! Groups Links
>
>
>
>



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-Chromatest J. Pantsmaker
http://www.chromatest.net