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There is a section with three 1x3-pin headers and three jumpers. The
jumpers need to be set correctly in order to work with your power
input. If you want to power your Field Kit FX via the 9VDC input in the
back of the unit, ALL three jumpers must sit in the lower position:
2. User Manual
If you are powering your Field Kit FX from a Eurorack ribbon cable,
ALL three jumpers must sit in the top position: