The Brother BE‑1204‑BC is an industrial power protection unit designed to safeguard the embedded PC of a four‑needle embroidery machine against voltage dips, surges, and external noise. Common failure points for this class of units include burnt or swollen capacitors, degraded surge suppression diodes, and loose input/output connections that can cause intermittent shutdowns or false fault indications. First‑check diagnostics: verify the AC supply voltage and continuity to the input terminals; inspect all electrolytic capacitors and rectifier diodes for signs of damage; review any error codes displayed on the machine’s control panel for patterns related to power instability.[oss-gpt-20b]