Between the end of assembly and the sealing of the carton there is a sequence that decides how many units come back.
Ageing
Power-on for 72 hours with periodic wake events. It catches the early failures that would otherwise appear in the customer’s first week.
Cycle bench
300,000 operations with torque and current logged. This is where a weak spring or a marginal motor shows itself.
Environment
Salt spray beyond 120 hours for metal parts; ESD at 8 kV contact and 15 kV air for the electronics.
Final audit
100 % functional check: every credential type, the anti-pinch function, the handle handing and the emergency input.
Takeaway
The gate is boring, repetitive and the reason a container arrives quietly.