The Hewlett Packard 70100A is the power meter module in the HP 70000 modular test system. This post will document a problem common to three 70100A units I have recently restored.

As part of the restoration process, I opened the modules to perform a visual inspection. What I found under the outer cover was this:

The rubber spacer pads between the circuit boards and the outer metal cover had deteriorated to the point of liquifying and running down board via gravity. All the pads in the three units I examined were afflicted to some degree. Several years ago, I documented a similar phenomenon involving an HP 8503B here.

The pad residue was removed from the board using Kimwipes and isopropyl alcohol. Fortunately, the circuit boards did not appear to be damaged by the residue. This left the pad adhesive discs still on the board. These discs were used to mount the replacement pads.

Thanks for reading.

Deteriorated Rubber Pads Electronics Electronics Restoration HP 70100A Shaun Merrigan