Which component is responsible for driving the alphanumeric display LEDs, the bar graph LEDs, and the alarm indicator LED?

• A. Display Board / Display Assembly
• B. Power Board
• C. Control Processor Board
• D. Alarm Interface Board

Answer: (A)

The component that drives the actual LEDs for the alphanumeric display, the bar graph, and the alarm indicator is the Display Board/Display Assembly. It contains the LED driver circuitry and the multiplexing logic needed to light the correct segments and bars, with the control processor sending data to it to update what appears on the displays. The power board simply supplies the necessary voltages, the control processor provides the data and commands, and the alarm interface board handles alarm signaling, but the LED driving itself happens on the display board.