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Thanks for this. I was measuring DC, duh ! I think I've determine what the common wire is, since I've buzzed the connections out with a meter and have found that 1 & 2 are for T&R 3 - 90% certain is the common 4 - connection into the privacy circuit 5 - door release 6 - buzzer...

Hi, I'm wondering if anyone out there can assist me with an issue we have with our flat door entry system. Managed to source a replacement handset for the Terraneo 600. The original had been modified to have a privacy switch and LED, not exactly high tech, especially the wiring ! The...