The Doorking 4602‑010 is the main logic/control board used in 9100 and 9150 slide gate operators; it manages motor drive, safety interlocks, timing, and communication with the operator’s power supply. Common failure modes include a dead power supply section (often due to blown capacitors or failed voltage regulators), degraded MOSFETs in the motor driver causing intermittent lock‑up, and cracked solder joints on the input/output connectors that affect safety sensor logic. First‑check diagnostics: verify 24 V DC rail continuity and regulator output voltages; inspect the board for burn marks, bulging capacitors, or loose pins; and run a short‑circuit test on the motor driver outputs while monitoring current draw to confirm proper operation.[oss-gpt-20b]