Application: NCR S2 flex interface pcb board is dedicated electronic interface circuit board suitable for NCR 6623,6627 S2 cash dispenser system. It realizes signal transmission and data communication between cash cassette and main control unit during cash dispensing and recycling workflow. This replacement pcb board fixes typical faults including cassette communication failure, no cassette detection, intermittent module offline, dispenser report error code and unstable signal connection caused by circuit aging, solder joint failure and component damage. Board layout, connector definition and electrical parameter comply with original factory standard, supporting direct on‑site replacement for ATM breakdown repair and regular equipment maintenance. 90 days warranty provided. It is an essential electronic spare part for NCR atm financial equipment cash processing system troubleshooting.