Maintenance training simulators have proven to afford equal or superior training at a lower life cycle cost than actual equipment trainers when teaching troubleshooting based on front panel indications, failure symptoms and some in-drawer visual indicators. The purpose of the study was to determine the effects of two-dimensional and three-dimensional fidelity of simulation and three levels of reduced accessibility to test points during training, on student troubleshooting performance while locating faults at the component level. A total of 186 students were observed and tested in the ET Splice modules of a Navy Basic Electricity and Electronics course. Conclusions are drawn about the relative training effectiveness of simulated and actual boards and recommendations are made in selecting active test points on simulated printed circuit boards.