FCB1010 Phantom Power Malfunction - Any techs here?

  • Hi all,


    I own a modified FCB1010 with a single cable MIDI in/out + phantom power mod that I did a long while back. A peculiar fault has occurred now which means that the pedal still powers up with the mains cable via the transformer but not with the phantom power DC supply. I bought a new 12v/2A max wall wart thinking that the issue was with the supply unit because the voltage is getting pulled down at the DC supply side when the unit is powered on, but this hasn't fixed the problem.


    When I power the unit on with AC mains supply, the input to the main board is seeing the full 10V required to power up, but when I use the DC supply (via the same pair of rectifier bridges) I'm only seeing 4V at the input. Any electronics experts have an idea what could be causing this?


    Cheers.