Replacing Farfisa 724N handset - 6 connections ? | DIYnot Dec 13, 2018The switch that is broken is the one that operates when the handset is lifted. When the handset is on the base the switch breaks contact and isolates the handset. The plastic on which the switch pivots is broken. It’s easy enough to override the switch but not a practical solution. Two pics, one showing wiring, other switch. Intercom Handset Finder Tool. Find intercom handsets Intercom Handset. Find door entry handsets fast with our unique door entry handset & intercom handset finder tool, replacement door entry handsets with wiring diagrams and pictures in pdf. Buy new intercom handsets from our uk on-line shop. Handsets (Intercoms) - farfisa-shop Farfisa company: About Farfisa. Farfisa company is a leader in the distribution and manufacture of advanced intercom, as well as videointercom systems. The main focus of the company is to guarantee primarily the safety and satisfaction of our customers, thus the Farfisa Company is perceived in the market as a reliable and honest partner.