If the HP LaserJet III printer shows „50 SERVICE“ after power up and the fuser is o.k. … then maybe the „AC Driver / Safety Circuit“ board of the „AC Power Module“ is defect. This PCB with part number „RG1-1438“ is made from cheap PCB base material which can render a conductive path between adjacentfeedthrough holes if it is old or was over heated.
Tags : hp laserjet iii, conductive path, safety circuit, base material, driver safety, fuser, ac power, pcb, holes, hp
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