I restored a Wavetek 1038-NS20 to fully working condition.
It is using these modules: 1038-NS20, D14, NS206, and one labled "calibrator output" and "ext ref input".
When I bought it on eBay, I found out that ALL the push-buttons had degraded over time
where they didn't snap in/out when pressed, most of them were permanently pushed in
which locked up the instrument!
I had to remove the 1038-NS20 module from the frame,
disassemble the 1038-NS20 module,
unsolder all the pushbutton switches,
cut open all the switches,
remove the guts,
put each one on my milling machine & machine the internal area larger,
install a new tiny pushbutton switch inside the original switch body and solder the connections,
epoxy it in place,
close-up the switch with the original engraved push-button re-installed.
solder the switches back into the PCB,
re-install the PCB into the 1038-NS20 module,
plug the module back into the frame & power it up for a test.
All the buttons worked! This took an entire weekend to do!
