Electroglas 100301 is a wafer‑probing PCB used in semiconductor test systems, typically mounted on the probe head assembly of an Electroglas prober. Common failure modes for this board include burnt or cracked surface‑mount components (especially power‑regulator ICs and decoupling capacitors), open or shorted signal traces due to mechanical flex or thermal cycling, and degraded solder joints on high‑frequency connectors. For a first check, verify the 12 V/5 V supply rails with an oscilloscope for ripple and correct voltage; inspect the board under magnification for visible damage or residue on critical components; and read any diagnostic LEDs or error codes from the prober’s host controller to pinpoint malfunctioning modules.[oss-gpt-20b]