Forgive me if this is an obvious question, but you tuned the 4', 8', and 16' trim pots too, right?
--- On Sat, 1/23/10, Quazimodo <noddyspuncture@...> wrote:
From: Quazimodo <noddyspuncture@...>
Subject: [yamahacs80] Here's a strange tuning issue...
To: yamahacs80@yahoogroups.com
Received: Saturday, January 23, 2010, 1:14 PM
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This is a strange symptom - wonder if any tech's here might have come across this one before..?
Today I tuned a CS80 - sinewaves on CD, CD player and CS80 into Oscilloscope. Everything seemed to tune up great, visually and audio wise. However when I closed the lid to play her - I noticed a couple of notes (in the lower octaves) were quite flat. I investigated and voices 5 and 6 on channel I were the culprits. Note, I had switched footages to 16' and 8' (where I normally play) and this is where the problem revealed itself.
I went back to 'tweak again' but I noticed that when adjusting the first two settings as written in the manual (the keyboard 'spread' adjustment) that this is done on the 2' footage setting. When I went back to that 2' footage, everything was fine again. It was all in tune and perfectly set.
It is when I switch away, down to the footages I use most often 16' and 8' that the problem arises.
Next I tried something - just using my ears I 'tweaked' the second pot down on the culprit cards, under the fine trimmer, the one you adjust in connection with the fine one, until those flat low notes sounded in tune. This is totally workable and she plays beautifully down on the 16' and 8' settings, but now when I go to higher footages then those same notes are miles out. Obviously something isn't quite right here. What would cause the 'keyboard spread' to vary between footages?
Obviously, once set at 2' it should be correct for all footages, otherwise there would be a seperate 'spread' adjustment for each. So I have in effect 'botched' it!! Haha!
Please, does anyone know where I should start investigating this wierd fault?
Hope someone can help
Cheers
TOM
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