- Confirm adapter board by cleaning and change new part ==> still fail at site3
- Confirm matrix board and matrix box by swap with spare part ==> still fail at site3
- Confirm cable matrix by swap with spare ==> still fail at site3
- Confirm 50 loop test MC unstable
- Confirm cable DCB (CN120,121 swap CN118,119) ==> still fail at site3
- Confirm DCB board by swap terminal cable with site1 ==> fail at site1
- Root cause from DUT board because
- For OP_ACK item measure at TOUT pin
- TOUT control by relay K478
- Change new relay replace on K478 ==> OK