Paktronics QDJ04 warming cabinet control board

Paktronics QDJ04 is the digital control and display board that drives a dual‑chamber medical warming cabinet, providing independent temperature setpoints, relay control of heaters, and status LEDs. Common failure points on this class of boards include degraded power supply rails (±12 V or 5 V), burnt‑out optocouplers or relays in the heater drive circuits, and failed temperature sensor inputs that trigger fault codes. First‑check steps: verify all input voltages at the board’s connector pins, inspect for visible burn marks or cracked PCB traces, test the relay contacts with a multimeter, and review any displayed error codes or LED patterns to isolate the faulty subsystem.[oss-gpt-20b]

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