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After device finish engineering prototypes stage, hardware engineer will need to provide test specification and pass criteria base on the product specification. Production test also could be treated as a simplified regulatlation test, because it has to fulfill standard of worldwide standard (for example: GSM) of local regulation (for example: Wi-Fi).
The target of production test, is deliver quality products. And production test won't go through all engineering details, because factory have time constriant on each station and production line also has cycle time for efficient for production.
Surface mount -> Visual inspection -> DM1 download (JTAG) -> GSM firmware download -> DM1 test -> Attach Bluetooth/Wi-Fi/LCM -> DM1.5 -> Housing assembly -> DM2 -> QA -> Packaging -> QA -> Release