Allen Bradley 1784T30G Keypad Touch Panel

The Allen Bradley 1784‑T30G is a 9‑inch CRT operator interface panel used on plant floor control systems, providing a membrane keypad and touch screen input to PLCs or DCSes. Common failure points in this model include power supply board degradation (especially the 115/230 VAC transformer), keypad contact wear, LCD backlight driver burnout, and solder joint fatigue on the main PCB due to vibration. Initial troubleshooting should verify proper line voltage and isolation resistance, inspect the keypad for mechanical damage or stuck keys, check the LCD backlight current and continuity of the display driver traces, and review any stored error codes in the HMI’s diagnostic log.[oss-gpt-20b]

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