I (and others) had given ideas as to what areas might be responsible. Since it's intermittent, might be time for some (careful) wiggling of wires and maybe some cold spray and/or heat gun to try and trigger the problem.
One thing I have seen in the last few CS80s I've worked on is that they all seem to be hitting an age now where lots of parts (caps, chips) are starting to go bad much more than I've ever seen. I think any I work on in the future that need anything more than a simple tuning is going to make me require the owner to pretty much agree to a full re-chip/cap. Yeah, it's expensive (and a pain in the ass to do - my hand is already getting numb from the motor in my Hakko desoldering gun) but the alternative is tracing bugs forever and possibly (likely?) triggering other already on the edge failures in the process with lots of power cycling.
Anyway, let us know what you find out!
David
On Jan 8, 2013, at 6:44 PM, "Constantin" <constantinz@...> wrote:
> Hi Kent,
>
> Thanks for your answer. I forgot to mention that the second instance this happened, it was very persisting. Had to bring someone to open it and take a look at it and then "miraculously" it worked again with nothing fixed.
>
> From your past two instances, what pattern did you notice after the keys were not working to go back to the working state? I mean did you leave the keyboard on for hours after the problem? Turned it off then turned it on later? If you have any recollection, that could maybe help, in case this happens again - cross your fingers it never happens.
>
> Fyi, from my small recollection, this problem is probably caused when the CS is just turned on and I play the keys immediately (note, that I do that rarely, only when I try to test my speakers for sound. I think I should never do that again, just to be safe, and only use the machine for the first time it is on for an hour first)
>
> Constantin
>
>
> --- In yamahacs80@yahoogroups.com, Omega Code 80 wrote:
>>
>> I experienced the same thing twice. No idea what is causing it.
>>
>> Kent
>>
>> On Jan 8, 2013, at 3:17 PM, Constantin wrote:
>>
>>> Hi there,
>>>
>>> I noticed the lower octave stopped working on my CS80 yesterday. All other keys, ribbon and knobs worked great. More specifically, the lowest C key on the left of the keyboard worked but every key after D, E, F, G, A, B, C (and the respective black keys) did not trigger
>>> any sound. The second octave (after C) and all other keys worked just fine.
>>>
>>> The weird thing is that an hour later I turned the machine back on again, to see if it will work, and everything WAS working back to normal. This has happened 3 times so far in the last year, in 3 different instances, and I don't understand what is causing this. I never move, tamper or shake my machine.
>>>
>>> If anyone has experienced something similar and was able to fix it, would love
>>> to hear back. Also any advice is greatly appreciated. Thank you for your time and Happy New Year!
>>>
>>> Constantin
>>>