On-site troubleshooting approach for SMT reflow soldering component tombstoning

A while back, while handling 0402 resistor placement on an SMT line at an electronics factory, the biggest headache wasn't the workload, but the sporadic tombstoning of 0402 resistors on the same board. AOI alarms were inconsistent, and the rework pressure was immense. If you rely solely on guesswork based on experience, it's easy to blame someone, while the real cause remains hidden. My…