Repair Cafe meets coffee machine!
Our fully up-market (sic) pod coffee machine, that’s only a bare ten years old, suffered a seemingly terminal malfunction recently – failing to power up when commanded.
A few die-hard repair-cafe types brought their expertise to bear to troubleshoot the device – hopefully back to working condition. Close scrutiny of the printed circuit board (PCB)
after some determined disassembly (not recommended for the faint-hearted) showed a burnt out resistor.
This, after some discussion as to the true value, was replaced but only after discovering the solder was a high-tin level solder that only melts at 450 degC!
Following partial re-assembly of the machine the power-on test showed that there were other components faulty and the resistor was just a sacrificial component as it burnt out immediately.
At this point the heavy reinforcements were needed for a deeper diagnosis. Another member weighed in with some informed circuit and component analysis. This suggested that the offline switcher LNK304GN appeared to be faulty and indeed was found to have a low ohm resistance ~240 ohm across the Drain and Source pins (but also mindful that other parts of the circuit may be causing the low 240 ohm resistance).
Plus
