HP 8903B Audio Analyzer PCB Pad Replacement
Visual inspection of my recently acquired HP 8903B Audio Analyzer revealed that the polymer pads on the bottom side of the main PCB were seriously deteriorated:
Besides making an unsightly mess, this residue may form corrosive products which, over time, could damage the PCB. Also, the pads no longer perform their bottom cover to PCB isolation function. So all the old pads and residue had to be removed and new pads installed. Lintless wipes, isopropyl alcohol, and nitrile gloves were the chosen tools.
The residue cleaned up completely, and new pads were installed. I won’t need to be concerned with this failure mode again.
Thanks for reading.