The Schlumberger 9720000381 REV 2A Probe Card is an interface board used in semiconductor test systems to connect the tester to the device under test. Common failure points for this class of probe cards include damaged or cracked signal traces, deteriorated connector contacts, and power‑rail over‑voltage damage from test equipment spikes. Initial checks should verify that the card receives proper supply voltage (typically 5 V or 12 V depending on the system) and that all connectors are seated without visible corrosion; then inspect for obvious burn marks or broken vias under magnification. Finally, run a short‑circuit check across the signal pads to ensure no unintended paths exist before proceeding with deeper diagnostics.[oss-gpt-20b]