Mitutoyo PL‑325L is a two‑axis digital readout (DRO) that interfaces with linear encoders via 6‑pin round connectors and displays axis positions on an LCD panel. Common failures include loss of display output (often showing “D” or blank), intermittent error codes, or keypad/cover damage; these are usually caused by a bad power supply, loose encoder connector, or damaged PCB traces. Start diagnostics by verifying the 120 VAC input voltage and checking for proper ground continuity, inspecting the 6‑pin connector for corrosion or misalignment, and reviewing any displayed error codes against Mitutoyo’s troubleshooting guide. If power and wiring are clean, perform a visual inspection of the board for burnt components or cracked solder joints before proceeding to component replacement.[oss-gpt-20b]