The Sortex QA90‑0201/1 is an industrial control PCB used in Sortex sorting systems and machine‑control applications. Common failure modes for this class include burnt or cracked components on the power regulation section, damaged I/O driver chips, and trace degradation from vibration or thermal cycling. First‑check steps: verify proper 48 V DC input voltage to the board, inspect all surface‑mount packages for visible damage or solder bridges, and read any diagnostic LEDs or error codes displayed by the host controller. If power and visual inspection are clean, test the output driver pins with a multimeter and compare against the reference schematic for correct logic levels.[oss-gpt-20b]