ups not switching to backup mode

Discussion in 'General Electronics Chat' started by abichebl, Mar 12, 2013.

  1. abichebl

    Thread Starter New Member

    Mar 12, 2013
    when the electricity goes off the ups bon't switch to battery to convert power and the relay is fine and the battey is new but i think there is a transistor or something is not working while there is nothing burned thanks for any assistance