OTIS 에스컬레이터 안전 스텝 스트립 XAA455J1 교체

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June 12, 2026
Video Description:
This video provides a detailed walkthrough of the Otis GEA21270A1 RCB-II Main Board, showing how this critical control PCB functions within Gen2 and 300VF elevator systems. You'll see how it manages central logic, processes signals, coordinates safety protocols, and facilitates system communication, offering valuable insights for maintenance and replacement procedures.