Yes, but then I'd expect *two* pins beeing
connected to the IC , not ?

As I said :
one pin to GND (black lead in the cable)
one pin to power (read lead in the cable, via an (common) inductor)
one pin to the IC

And the two first pins from each of the three sensors are
tied together (directly, via the PCB). The third pin from
each sensor is connected to three different pins on the IC.

Jan-Erik.

Olin Lathrop wrote:
>One pin is either power or ground.  One end of both
>photodectors are tied to this pin.  The other two pins are the other ends
>of each photodetector.  I seriously doubt you have both a power and ground
>rail in the three pins.

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