Tracor Paktronics QDJ04 curcuit board curcuit board

The Tracor Paktronics QDJ04 is a temperature controller board used in warming cabinets and other industrial heating applications. Common failure points for this model include burned or tripped protection diodes on the power input, faulty thermocouple connections, and degraded potentiometers (e.g., R5) that affect display calibration. Begin diagnostics by verifying 24 V DC supply to the board, inspecting all solder joints and component leads for cracks or burn marks, and checking the thermocouple terminals for continuity; then review any error codes displayed on the LCD panel.[oss-gpt-20b]

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