[sdiy] Korg Micro-Preset Question - presets not working

[Travis Thatcher]

Yeah, the schematics are quite difficult. I'll take a closer look at them tonight. Does anyone have the datasheet for those switches? do they just switch pairs of connections?

T

Http://www.recompas.com
Http://www.judichicago.com
Http://voiceofsaturn.blogspot.com

On Jul 21, 2011, at 7:25 AM, Tom Wiltshire <tom at electricdruid.net> wrote:

> Looking at the manual from http://manuals.fdiskc.com/mans/Korg.html, I see from the diagram on pg 10 that the three presets that don't work are all in the same column, "Wood". Am I right in thinking that those sounds are basically the same except for the oscillator signal that they're fed? If so, you could try checking that the osc outputs that feed them. That'd explain why some weren't working, but two (Oboe, Basson) are still ok. Something further downstream (like a filter) would affect everything in that column, I'd have thought.
> 
> It's pretty difficult to see on those schematics, but if you could see what the little boxes connected to the "Woodwind" switch were, you could see where the signals are coming from (those filters and stuff on the far left of pg 11, mostly) and I suspect it'd be easy enough to figure out which bit's gone down. Trouble is - you *can't* bloody read it.
> Still, my best guess is to test the signals going into that switch, then follow them back to the oscillator signal processing bit where different flavours of square, ramp, etc are derived by simple filters and see which bit of that has died.
> 
> HTH,
> Tom
> 
> 
> On 21 Jul 2011, at 09:30, Adam Inglis wrote:
> 
>> The woodwind sounds are divided into two groups on the circuit board - that might be a clue.
>> 
>> On 21/07/2011, at 4:20 PM, Travis Thatcher wrote:
>> 
>>> Yeah, the switch seems OK.  I have the service manual in PDF form but
>>> its pretty horrible. Anybody have ideas on where to start
>>> troubleshooting those voices? I'm thinking its something in the filter
>>> section.
>>> 
>>> -T
>>> 
>>> On Mon, Jul 18, 2011 at 5:38 PM, Travis Thatcher <recompas at gmail.com> wrote:
>>> 
>>>> Switches are my first guess - i'm cracking it open tomorrow though I
>>>> found it odd that other  voices work in the woodwind row (meaning the
>>>> switches should be okay?)
>>>> 
>>>> On Mon, Jul 18, 2011 at 5:37 PM, ghetto synth <ghettosynth at gmail.com> wrote:
>>>> 
>>>>> Have you cleaned the switches?
>>>>> 
>>>>> On Sun, Jul 17, 2011 at 7:19 PM, Travis Thatcher <recompas at gmail.com> wrote:
>>>>> 
>>>>>> I've got a Korg Micro-Preset with presets not working.
>>>>>> 
>>>>>> Recorder, Flute, and Clarinet make no sound but all other presets work
>>>>>> fine. Anybody here have any ideas on what I should be looking for to
>>>>>> fix?
>>>>>> 
>>>>>> Thanks,
>>>>>> Travis
>>>>>> 
>>>>>> --
>>>>>> http://www.travisthatcher.com
>>>>>> http://www.voiceofsaturn.com
>>>>>> http://voiceofsaturn.blogspot.com
>>>>>> http://www.judichicago.com
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>>>>> 
>>>>> 
>>>> 
>>>> 
>>>> 
>>>> --
>>>> http://www.travisthatcher.com
>>>> http://www.voiceofsaturn.com
>>>> http://voiceofsaturn.blogspot.com
>>>> http://www.judichicago.com
>>>> 
>>>> 
>>> 
>>> 
>>> 
>>> -- 
>>> http://www.travisthatcher.com
>>> http://www.voiceofsaturn.com
>>> http://voiceofsaturn.blogspot.com
>>> http://www.judichicago.com
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