Digital Instrument Forums

Since yesterday, my FR4X doesn't switch on on batteries, but just with the power adapter. I have checked and changed the batteries, opened the case and measured that the power from the batteries does reach the mainboard of the FR4X with the right voltage (13,1 Volts), so it is not a problem of cables connection or bad batteries. But without the power adapter, using only batteries, it doesn't switch on. Is there a fuse somewhere in the board protecting the supply from batteries? Is there some setting which excludes batteries (I have not found one in the Reference Manual) Can you imagine any other explanation, beside a faulty mainboard, which needs repair? Many thanks in advance for your help. Roberto

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