ProtoTRAK M2 16969 is a CNC controller module used in small‑batch machining centers and lathes, featuring an integrated display, RS‑232C interface, and servo drive outputs. Common failure points on this class of units include power supply rails (12 V/24 V), backplane connectors, and the LCD panel or its driver board; overheating can also damage the control ICs. First‑check diagnostics: verify 12 V/24 V rail voltages at the controller’s input pins, inspect all ribbon and IDC connectors for corrosion or loose contacts, and examine the LCD module for visible burn marks or a failed backlight. If those checks pass, review any stored error codes via the RS‑232C interface to isolate software or firmware issues.[oss-gpt-20b]