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> After the keys were removed I´ve seen that somebody was there before me and placed a 67K resistor between -15 and +15 terminal.
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?
>It was kind of repair as in Joachim´s topic about his faulty AT sensor.
Not exactly. I added a resistor in parallel to an R1 carbon track to reduce its excessive resistance value.
>After I took the rubbers and cover out I started to measure.
>At working AT sensors it starts at around 14V and the current decreases at each terminal about 2V finally reaching 4V.
You do not give precise information of what you're measuring.
>I've just noticed ,that the little carbon track is broken ( the one between -15 and T3).
>What is it´s function? Resistance?
Yes it is. It's part of a simple voltage divider. Look at the photo I posted where I overlayed an excerpt of the diagram and a few labels.
>So after placing the 6.7K resistor between -15 and T3 in place of the broken carbon track it came alive a little.
You're not easy to follow. Is this 6.7k the 67k you mentioned above?
In my case, the issue was an excessive R1 value (No idea why it became excessive). The thing is that it was easy to fix without directly touching the printed board.
In your case, it seems this R1 value was removed and replaced by a resistor by a technician. Perhaps the R1 had a too low value and in this case, there was no other solution than removing R1 and replacing it.
Could you post a photo of the defective part? A picture being worth a thousand words...