Nordson 171031C is a control‑circuit board used in hot‑melt adhesive machines to regulate motor drives, temperature sensors and safety interlocks. Common failure modes on this class of boards include burnt or cracked ICs, failed power‑regulation components (diodes, capacitors), and degraded solder joints on the drive output pins; overheating can also cause insulation breakdown between high‑voltage tracks. First‑check diagnostics: verify that the board receives its rated input voltage and that all supply decoupling caps are within tolerance; inspect for visible burn marks or cracked traces, especially around the motor driver ICs; and confirm that all I/O signals (motor torque, temperature, safety trip) are present and clean using a multimeter or oscilloscope.[oss-gpt-20b]