[sdiy] Korg Delta problem

[Roman Sowa]

If it's string section going completely silent, check if the TOG is 
still running after it happens. It may be a simple fault, probably 
mentioned here connections and sockets corroded (I also recommend 
reseating everything), or broken mylar cap, yeah!
So easy to make the TOG oscillator stop. Check with oscilloscope all TOG 
pins and start searching from there if it runs at the quiet state, but I 
have a feeling TOG is not running after those 2 hours.

As a side note, my last replaced capacitor was mylar in the filter. 
Could not go higher than few kHz. One of its leads fell off during 
desoldering and I gess it was not a coincidence. Filter worked like new 
even with X7R cap place there only to check.

And I'm gonna have to tell all my 40-years old capacitors in working 
equipment that they need to go now, 35 years of pretending they're good 
is enough.

Roman

W dniu 2018-06-18 o 23:27, Jean Bender pisze:
> I'm sorry, i just realize i made a mystake, it's not the synth part
> which not working, but the string one.
> 
> I gonna check the voltage power path to see if something wrong happens.
> 
> Thanks for your answers.
> Best
> J.
> 
> 2018-06-18 22:03 GMT+02:00 Edward Schultheis <edwardschultheis at me.com>:
>> The Delta uses divide down, this making it paraphonic... it is not a 4 voice synth.
>>   There are no voice cards or anything like that in that beautiful synth!
>>
>> Edward Schultheis
>>
>> Sent from me!
>>
>>> On Jun 18, 2018, at 12:52 PM, Tim Ressel <timr at circuitabbey.com> wrote:
>>>
>>> Sounds like the power supply is cutting out. I'd check that first.
>>>
>>> --tim
>>>
>>>
>>>> On 6/18/2018 12:42 PM, Jean Bender wrote:
>>>> Hi !
>>>> i just got a korg delta, but it seems to be a bit tired.
>>>> Once you start it, it works as a charm, no probs, but if you wait one,
>>>> two hours, even if you are outside, with sun or no, the synthetizer
>>>> part stops by itself.
>>>> All four voices shut down, but i still can use the string part.
>>>>
>>>> It looks a lot to me as a temperature problem, but if i open it,
>>>> nothing seems to be broken or something.
>>>>
>>>> Where should i look at first ? Would it be a cap problem in the audio path ?
>>>>
>>>> Any help would be greatly appreciated.
>>>> Thanks !!
>>>> J.
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>>>
>>> --
>>> --Tim Ressel
>>> Circuit Abbey
>>> timr at circuitabbey.com
>>>
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