A system and method for testing at least one joint in a linkage includes a platform system, a torque system, an articulation assembly and a fault detection system. At least a region in the outer circumferential surface of a shaft, which faces the radial bearing gap, is constituted of an electroformed part, and the region of the shaft excluding the electroformed part is constituted of a resin portion. The database contains driver face data and a telephone number of a mobile telephone used by the driver for each of the drivers. A controller utilizes a database of test recipes to supervise and control the optical signal sources, optical signal degradation elements, units under test, input switches, output switches, and test equipment to conduct a variety of optical tests on the modules. The two inner stages also apply a small amount of amplification to the first band.