The Farnell Instruments M3 ISO Metric (model 4341501) is a compact AC‑DC power supply rated 115/230 V with 1.4 A at 115 V or 0.8 A at 230 V, commonly used to feed industrial control boards and servo drives. Known failure modes include output voltage sag due to failed electrolytic capacitors, blown internal fuses, overheating of the transformer winding, and shorted rectifier diodes; these often manifest as a loss of power or intermittent operation. First‑check diagnostics should verify that the input mains voltage is within spec, measure the regulated output voltage with no load, inspect all fuses and replace if blown, and visually examine the board for burnt components or swollen electrolytics before proceeding to component replacement.[oss-gpt-20b]