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Hello, I have a weird problem with a CS-80: there is no signal coming from the filters in section 1 if the synth is in panel mode. The sine signal is coming through fine. The presets and memory 1 and

More I just found: VR5 on the KAS is actually 5k, not 2k. This one is troubling since it’s a time-constant: all the 0.01?F caps that feed the 3.3MΩ resistors into the output buffer S/H are

Hi all! Hope everyone is doing great. I'm still working on a major CS80 overhaul and was getting ready to put in a couple hundred 25-turn trimmers. The first ones I went to replace were the 8 for

The mystery was solved this morning. As the title of this topic adds to the already great confusion about using an FC-7 pedal on the CS-80 EXP connector, I thought a conclusion would be useful.

That's really weird! Anyway, that's OK for now.

Well, it plays at minimum AT actually.

One final thing you could probably do while waiting for the final repair to be done. Currently, whenever you play the key with faulty AT sensor, it plays as if with maximum AT. Right? So, you could

So I checked voltages at the KAS board, the 3rd voice board seems to be getting the same voltage/drop as all the others...so I should be able to rule that out, right? I've swapped a few of the VCAs

That would explain why the "glue guy" left it alone and repaired the other one. Anyway - I?ve switched the pcb?s and it?s in the place that is less bothering when I play. Someday maybe I will try

I fear that the value of resistor R2 has become too low now to let you compensate by a reasonable value of RA.

So I?ve changed RA from 6.7k to 3.8k and nothing. I still read 14.2v where it should be around 4V.

I know what you meant by "The Guru" ;) - I liked the term. I would try to go with 4.4k and when it works better, down to 2.2k. But right now I?m now scared about the PSU.

blue, grey, red give 68 x100 = 6.8k, not 67K. This is better than 680, but certainly lower than the initial value of R1 (when I had to fix my own AT issue, Kent Spong suggested a 82k value for R1).

RA is blue, grey, red. So it?s X100. 67K. 1. Is it really a risk? Now it?s 67K.. I could try 44k for example. 2. The "Guru" is unknown. Might be dead as well...:/ But that would be the best

PS at the end of step 2, I meant : Then you'll also have to adjust RA for an appropriate value.(not R2)

For resistor RA, the colors seem to be blue-gray-brown. Can you confirm this, especially the brown? If this is the case, its value is only 680 ohms, which is very little. This small value was used to

Number 2 works rather well. I think we should not worry about 2 (or should we? they - 15 is in series). Anyway, on number 2 RC is connected to -15 and probably to T3. RB is connected to T3 and R4 (to

Ouch ! There is glue here and there and especially on carbon tracks! I don't know if that's a recommended thing. But don't remove it for now as the result might be worse. You should try and find how

http://groups.yahoo.com/neo/groups/yamahacs80/photos/albums/1557574004/lightbox/1720453728 There it is. You can see it?s pretty banged up there. And the sensor on the right was also already

That's rather strange. Why would someone do that? This would only produce an increased current consumption. Are you sure that the 67k is between -15 and +15 terminals? Not exactly. I added a