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MadskpAlso when connected can you meassure a voltage around 5V between ground and IR data screw terminal of the IR eye? No, it’s about 0.4V If yes can you see the voltage changing when pressing a key on the BEO4? Pressing transmit shows momentary change from 0.4V to about 1V
That does not sound right. I just double checked on a MCL2AV, and the voltage between ground and IR data is normally 4.95V and drops to some place between 4 and 5 V depending on the key pressed. I have also seen this behaviour on other setups.
One thing you could do is to meassure on the bare ends of the rest of the wires in the network cable if any of them have a voltage arround 5V. That could indicate if the Essence has a different wirering.