The concepts, methods and technics for the electronic testability implementation

The first part of the paper briefly describes the necessity of testability and the design-for-test concept. The testability problem is presented at the integrated circuit, printed circuit board layout and electronics module levels. In the second part, several very important strategies for testability development are proposed (in nine stages). As applications, testing practice problems are presented, including testing of printed circuit board and link connections (connection interrupts or unsoldered connections, short-circuit to GND), and testing of circuit board connectors (connector with broken or bent pin, network terminator fault, conflict on the network). The final part of the paper presents a system for verification of component positioning on the board by image acquisition and processing (orientation, correct value and type of component, correct solders).