Delta Electronics Q1271‑60228 is an industrial switching power supply commonly installed in HP DesignJet 4000/4500 and Z6100 printer systems to provide regulated DC output for the mainboard and imaging unit. Common failures on this model include capacitor electrolyte leakage or bulging, fan motor burnout, and transformer winding insulation breakdown, often manifesting as overheating, audible whining, or intermittent power loss. Begin diagnostics by verifying input voltage stability with a multimeter, inspecting the output rails for correct voltage under load, checking for visual signs of component damage (burnt spots, swollen capacitors), and listening for fan operation; if any fault is detected, replace the affected components before re‑testing.[oss-gpt-20b]