Toshiba D9CM-01-A monitor

The Toshiba D9CM‑01A is a legacy 8.4‑inch RGB CRT monitor used as the operator interface on Fanuc and other CNC control systems. Common failure modes include power supply board degradation (transformer or rectifier), tube burnout, backlight flicker from phosphor decay, and video input circuitry faults such as damaged CGA/EGA connectors. First‑check diagnostics: verify 12 V/5 V rail outputs with a multimeter; inspect the CRT for visible cracks or burn marks; test the video input connector continuity and check for any shorted pins; review the control system’s diagnostic logs for HMI errors.[oss-gpt-20b]

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