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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 repaired.
Yellow cable is the bridge for the broken -15V track.
Sorry if my messages were confusing- I want to start from the scratch.
On the working sensors I read around 14V on the large track ( like that next to LC letters on the photo),
and 4V on the left one (next to HA letters).
On this one it´s 14.8V and 14.2V.....Seems that resistance is way to small there.
You´re probably right- the 67k resistor was placed to keep AT settings low.