Archive of the former Yahoo!Groups mailing list: Yamaha CS80

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 compensate for the low resistance of the damaged R2 and keep the voltage divider overall range.

Now, your measures show that the value of the resistor R2 is now significantly lower than 680 ohms.
To recover the voltage divider range, I can see three ways:
1. Reduce the value of RA. But doing so will increase the current through RA and R2. I don't know how the PSU will support this. This seems risky. I wouldn't do it.
2. Increase the value of R2. I don't know how to do this nor whether it is possible to recover a printed resistor. You'll need the advice of a "printed track + silicone glue" guru. Then you'll also have to adjust R2 for an appropriate value.
3. Recreate the R2 resistor with a series of 10 resistors, one for each step. That's a bit of work, but this seems to be the most accessible way and realistic way.