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OSMAC HOW-TO: installing/removing a TRIAC board

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


  • If your cabinet has a top cover, remove it.
  • You should then see the OSMAC component housing.
  • When the housing is open you should see the six TRIAC boards in the center.
  • Disconnect the 9-pin ribbon cable going into the board and the ribbon cable leading out of the board, into the board next to it.
  • It should then slide out of the housing.