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OSMAC HOW-TO: installing/removing a surge board

To power down an OSMAC system, disconnect the 12V and 26V power wires connecting the transformer to the decoder module.


  • The surge boards are located inside the bottom portion of the cabinet. Open the cabinet and you should see up to six surge boards.
  • Disconnect the cable connector and the field wires on the opposite side.
  • Unscrew the four screws securing the board in place.