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Explanation: This is the most useful expresion I've found. See the Eurodicautom and the Routledge Technical English-Spanish dictionary for help (but they do not offer you a solution). It could also be "device panel"
LinguaVox Spain Local time: 10:15 Native speaker of: Spanish, French PRO pts in pair: 154
Explanation: If this is an electronic device, the usual expression for circuit board is "placa base", but it does just carry the electronic devices. You can also have a more rigid system, called a chassis, usually made of metal. Heavier devices are mounted on a chassis, because a circuit board would not be strong enough.
Just from my experience as an elctronic designer.