A work station with modular elements particularly simple to be handled and allowing the station to be transformed in response to the product to be assembled is provided. In the method, a BIOS program code to be tested is loaded into a memory unit by a BIOS debugging card to execute a boot operation testing. A manufacturing method includes: arranging the first fiber optic sensor in the first groove and arranging the second fiber optic sensor the second groove; and stacking the second substrate on the first substrate and stacking the third substrate on the second substrate.