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Hi there,
My CS80 was working fine until today, when I noticed the lower octave stopped triggering any sound. All other keys, ribbon and knobs work great.
More specifically, the lowest C key on the left of the keyboard works but every key after D, E, F, G, A, B, C (and the respective black keys) does not trigger any sound. The second octave (after C) and all other keys work just fine.
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,
Constantin
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Hi Constantin.
Welcome to the group. Sounds like it's probably a simple problem. If you look at the giant, overall schematic ( ), you'll see in the upper left corner that the keyboard is scanned as a matrix, like a computer keyboard, from the KAS chip. The low octave (not counting the lowest C, which has its own special pin) all have the U1 signal in common from the KAS chip / board. If you look at the KAS circuit board layout ( ), on the right edge of the board, about a dozen pins from the top, is this signal, U1. According to the invaluable wiring labels, this is a red shielded wire that connects to C1 - the lowest key. You can see the wires on the circuit board at the back of the keys that holds the metal key contacts. You'll see that each circuit board hold 6 keys except C1, which is all by itself. Since that key works and the next octave doesn't, it looks like the jumped wire that connects U1 from that little C1 board over to the board next to it is broken.
If you're somewhat familiar with electronics and know how to open up the lid, this should be pretty easy to check. If not, find someone who is!
Good luck,
David
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On Dec 3, 2012, at 9:12 PM, "Constantin" <constantinz@...> wrote: Hi there,
My CS80 was working fine until today, when I noticed the lower octave stopped triggering any sound. All other keys, ribbon and knobs work great.
More specifically, the lowest C key on the left of the keyboard works but every key after D, E, F, G, A, B, C (and the respective black keys) does not trigger any sound. The second octave (after C) and all other keys work just fine.
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,
Constantin
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Thank you so much for your quick reply Dave. I was able to understand the schematics and your notes, and will wait for my friend who is good in electronics to look at it. Will keep you posted how it goes.
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--- In yamahacs80@..., David Rogoff <david@...> wrote:
Hi Constantin.
Welcome to the group. Sounds like it's probably a simple problem. If you look at the giant, overall schematic ( ), you'll see in the upper left corner that the keyboard is scanned as a matrix, like a computer keyboard, from the KAS chip. The low octave (not counting the lowest C, which has its own special pin) all have the U1 signal in common from the KAS chip / board. If you look at the KAS circuit board layout ( ), on the right edge of the board, about a dozen pins from the top, is this signal, U1. According to the invaluable wiring labels, this is a red shielded wire that connects to C1 - the lowest key. You can see the wires on the circuit board at the back of the keys that holds the metal key contacts. You'll see that each circuit board hold 6 keys except C1, which is all by itself. Since that key works and the next octave doesn't, it looks like the jumped wire that connects U1 from that little C1 board over to the board next to it is broken.
If you're somewhat familiar with electronics and know how to open up the lid, this should be pretty easy to check. If not, find someone who is!
Good luck,
David
On Dec 3, 2012, at 9:12 PM, "Constantin" <constantinz@...> wrote:
Hi there,
My CS80 was working fine until today, when I noticed the lower octave stopped triggering any sound. All other keys, ribbon and knobs work great.
More specifically, the lowest C key on the left of the keyboard works but every key after D, E, F, G, A, B, C (and the respective black keys) does not trigger any sound. The second octave (after C) and all other keys work just fine.
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,
Constantin
------------------------------------
Yahoo! Groups Links
|
Hi Dave,
I had a friend of mine who is cs80 savvy come by and take a look at it. He opened the case, took a look below the keys, to check and clean things up. He found a piece of glitter and we thought that could have caused it, since the machine started working again. Since then, I think it was the 17th of Dec, I was able to play with no problem on a daily basis.
Then a couple of hours ago, I turned it on and same problem, the lowest octave stopped working again out of the blue. So I turned it off. A few minutes ago I decided to give it one more try, so I turned it on and now it works again. And I did not tamper or shake anything. Any guess of what does this mean.
Btw, I noticed this happening once again a few months ago... where the lowest octave would not work then a few hours later it worked. Any ideas?
Thanks ahead and Happy New Year!
Constantin
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--- In yamahacs80@..., David Rogoff wrote:
Hi Constantin.
Welcome to the group. Sounds like it's probably a simple problem. If you look at the giant, overall schematic ( ), you'll see in the upper left corner that the keyboard is scanned as a matrix, like a computer keyboard, from the KAS chip. The low octave (not counting the lowest C, which has its own special pin) all have the U1 signal in common from the KAS chip / board. If you look at the KAS circuit board layout ( ), on the right edge of the board, about a dozen pins from the top, is this signal, U1. According to the invaluable wiring labels, this is a red shielded wire that connects to C1 - the lowest key. You can see the wires on the circuit board at the back of the keys that holds the metal key contacts. You'll see that each circuit board hold 6 keys except C1, which is all by itself. Since that key works and the next octave doesn't, it looks like the jumped wire that connects U1 from that little C1 board over to the board next to it is broken.
If you're somewhat familiar with electronics and know how to open up the lid, this should be pretty easy to check. If not, find someone who is!
Good luck,
David
On Dec 3, 2012, at 9:12 PM, "Constantin" wrote:
Hi there,
My CS80 was working fine until today, when I noticed the lower octave stopped triggering any sound. All other keys, ribbon and knobs work great.
More specifically, the lowest C key on the left of the keyboard works but every key after D, E, F, G, A, B, C (and the respective black keys) does not trigger any sound. The second octave (after C) and all other keys work just fine.
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,
Constantin
------------------------------------
Yahoo! Groups Links
|
Hi Constantin,
Sounds like "intermittinet component failure" to me, if indeed there IS such a thing!?
If something is working and then stops... only to start working again, one usually suspects a bad connection/dry solder joint.
I'd say just open the hood and keep moving things 'gently' - everywhere, logic says it will eventually show itself.
Unless there really IS such a thing as "intermittent component failure" of course.
I had a similar symptom a few years ago where the symptom was intermittent and the after touch screwed and keyboard behavin strangely... and it was a wire going to one of the TSB boards. Took ages to find...!
Cheers,
TOM
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--- In yamahacs80@..., "Constantin" wrote:
Hi Dave,
I had a friend of mine who is cs80 savvy come by and take a look at it. He opened the case, took a look below the keys, to check and clean things up. He found a piece of glitter and we thought that could have caused it, since the machine started working again. Since then, I think it was the 17th of Dec, I was able to play with no problem on a daily basis.
Then a couple of hours ago, I turned it on and same problem, the lowest octave stopped working again out of the blue. So I turned it off. A few minutes ago I decided to give it one more try, so I turned it on and now it works again. And I did not tamper or shake anything. Any guess of what does this mean.
Btw, I noticed this happening once again a few months ago... where the lowest octave would not work then a few hours later it worked. Any ideas?
Thanks ahead and Happy New Year!
Constantin
--- In yamahacs80@..., David Rogoff wrote:
Hi Constantin.
Welcome to the group. Sounds like it's probably a simple problem. If you look at the giant, overall schematic ( ), you'll see in the upper left corner that the keyboard is scanned as a matrix, like a computer keyboard, from the KAS chip. The low octave (not counting the lowest C, which has its own special pin) all have the U1 signal in common from the KAS chip / board. If you look at the KAS circuit board layout ( ), on the right edge of the board, about a dozen pins from the top, is this signal, U1. According to the invaluable wiring labels, this is a red shielded wire that connects to C1 - the lowest key. You can see the wires on the circuit board at the back of the keys that holds the metal key contacts. You'll see that each circuit board hold 6 keys except C1, which is all by itself. Since that key works and the next octave doesn't, it looks like the jumped wire that connects U1 from that little C1 board over to the board next to it is broken.
If you're somewhat familiar with electronics and know how to open up the lid, this should be pretty easy to check. If not, find someone who is!
Good luck,
David
On Dec 3, 2012, at 9:12 PM, "Constantin" wrote:
Hi there,
My CS80 was working fine until today, when I noticed the lower octave stopped triggering any sound. All other keys, ribbon and knobs work great.
More specifically, the lowest C key on the left of the keyboard works but every key after D, E, F, G, A, B, C (and the respective black keys) does not trigger any sound. The second octave (after C) and all other keys work just fine.
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,
Constantin
------------------------------------
Yahoo! Groups Links
|
