A portable medical apparatus comprising a digital radiographic image detector assembly having at least one access opening extending through an enclosure of the assembly for troubleshooting, repairing and/or replacing field replaceable components within the assembly or components that are external to the assembly but attach internally within the assembly, without exposing the rest of the assembly to the outside environment. The portable medical apparatus includes a housing, a radiographic imaging device enclosed within the housing, at least one access opening extending through the housing for accessing components of the radiographic imaging device, and an access cover removably attached to the at least one access opening.