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A blanking plate must always be used whenever a slot does not contain an output module. Any blanking plate should be
secured to the lid before closing it. To facilitate operations, the BPs should be assembled before the OPs.
As evidence of power unit proper closing, output modules PCBs must be properly housed in the notches and in the slots of the
chassis and cover respectively, mechanical parts and screws holes must be aligned without exerting any effort.