Issue
The D192G panel zone (point) is in trouble and the yellow LED is not on.
Solution
With the zone/point in trouble and No Yellow LED On there is a wiring fault. One of the following terminals do not have power connected to them.
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External Power In (EXT PWR IN)
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Auxiliary Power In (AUX PWR IN)
Terminal 1 (AUX PWR IN) 13.75 VDC
Terminal 2 (Common)
Terminal 3 (Supervised Zone / Point) 2.50 VDC Normal Condiction < 1.50 VDC In Trouble Condiction
Terminal 4 (Trigger) 13.75 VDC In Alarm Only
Terminal 5 (External Power In) 12 VDC or 24 VDC Depended on needed Output for the NAC's or Power Supply
Terminal 6 (Common) This is the Common from an 24 VDC External Power
Terminal 7 (Positive Alarm Output)
Terminal 8 (Negative Alarm Output)