AW: [sdiy] Prophet 600

[Csaba Zvekan]

Thank you Pete and thank you Bob,

I have looked at  both of your Prophet 600 Schematics. But I already  
had those exact ones. The Board 1 and Board 2 are not scanned and not  
covered. And unfortunately I was interested to look at Board 1 schema.  
That's where the Potis and Switches and so on are. I am having some  
difficulties narrowing down the problem. I have some weird behavior  
with Voice 3b . Ever since I replaced the DAC71 and tweaked on the  
R4333 something happend and I don' t know how to adjust the poti  
properly . Sometimes I think I have it just to realize that this VOICE  
3b is of in the last octave but only if I have frequency  >6 - 10. I  
have replaced U423 thinking the OP-AMP might be bad, Then I replaced  
U416. Tomorrow I will replace the CE3340 just the see if maybe that is  
Bad . But I  doubt it it the .I suspect some 4000 series CMOS on Board  
1. There are a few. That demux the frequencies of VoicesA and VoicesB  
and fine tuneB.
I think I'm gonna order the Technical Manual straight from  
WineCountrySequential. It's like 24$ but oh well. I can't be that  
cheap :).
I will need in the future and synth deserves it.
So thank you again you guys been very nice and fast in helping me.


Csaba


On Jun 2, 2008, at 9:41 PM, Ullrich Peter wrote:

>
>> Does anybody have the Prophet 600 Technical/Service manual as a pdf  
>> or file ?
>
> Just for information: I already sent him the schematics today per  
> private email.
>
> Ciao
> Peter
>
> http://www.ullrich.at.tt
>
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