Motorola 021‑5305‑000C is a dual high‑speed printed circuit board designed for use in rugged industrial control systems, typically as the main logic module within motor drives or process controllers. Common failure points on this class of boards include degraded surface‑mount capacitors, cracked solder joints on high‑current traces, and aging power‑management ICs that can cause intermittent resets or over‑temperature shutdowns. Initial diagnostics should verify the 24 V/48 V supply rails for correct voltage and ripple, inspect the board for visible signs of component damage or thermal stress, and review any logged error codes from the host controller to pinpoint a specific fault source.[oss-gpt-20b]