Gullco GK‑171‑36 is a travel carriage control board used in industrial gantry or vertical carriage systems, typically driving stepper motors and managing position feedback. Common failure modes for this class of boards include burnt or tripped protection fuses on the power input, degraded MOSFETs or driver ICs due to overcurrent/overtemperature, and broken trace connections from mechanical vibration. First‑check steps: verify the 24 V DC supply voltage and polarity; inspect the board for visual signs of burn marks or cracked components; confirm that all I/O signals (step, dir, enable) are present and within spec using a multimeter or oscilloscope before proceeding to component replacement.[oss-gpt-20b]