Analogue Coax Video
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      1740/90 Analogue coax video system monitor connections

      This article outlines all of the connections on a 1740/90 Analogue coax video system monitor.

      1740-90-1

      1. R1 = OV Monitor supply
      2. R2 = +18V Monitor supply (Only after a call)
      3. V5 = Coax Screen
      4. V3 = Coax inner
      5. CA = Call
      6. 1 = Audio to monitor
      7. 2 = Audio to panel
      8. 6 = Audio 0V
      9. 9 = Lock release