Identifying signal line connected to known line via short circuit - by applying probe to faulty line to detect signals as digital levels are applied to PCB inputs

摘要

A computer controlled tester, connected to a circuit board carrying a signal line to be identified, has a display unit and a digital level detection probe (TS) connected to a test value memory. The probe is connected to a faulty signal line and digital levels applied to the board (FBG) inputs (EA) sequentially according to prederfined values from bit pattern sets (B1-Bn). Measured values are compared with desired values for the faulty line to form a reference value for comparison with anticipated values on the remaining signal lines. USE/ADVANTAGE - Detecting line shorted to detected faulty signal line p.c.b. without component removal.