Lock Metal Check 9 75405 is a conveyor‑mounted metal detector used in pharmaceutical and food processing lines, designed to detect ferrous, non‑ferrous, and stainless steel contaminants. Common failure points for this class of equipment include coil degradation or misalignment, power supply instability (±12 V DC), control board component failure (ICs, capacitors), and sensor threshold drift due to dust or corrosion. First‑check diagnostics: verify the 24 V input voltage and monitor the detector’s indicator lights for fault codes; inspect the detection coils and wiring harness for physical damage or loose connections; and perform a sensitivity test with standard metal strips to confirm proper calibration.[oss-gpt-20b]