troubleshooting on a board

alternating-current analyzing assistance asymmetric board business circuit circuit-board component computer conductance cross-section diode direct-current electrical-equipment electronic electronic-service electronic-technician electronics-industry equipment finger focused hand industrial industry instrument- junction lab maintenance manufacturing measuring measuring- measuring-value-of-resistor meauring-the-value-of-resistance mechanic multimeter occupation ohm ohmmeter open-circuit oscilloscope person probes professional rectification red repairing resistance resistor semiconductor semiconductor-material service short-circuit support technician technology test testing threshold-voltage tool troubleshooting work