I've continued searching for this encoder, however, I haven't had any luck with the exception of someone selling used ones on eBay for around $75.
My assumption at this point is finding a replacement that I can retro fit in. Unfortunately I can't take any voltage measurements due to needing the entire oscilloscope assembled, and I didn't see any silkscreen markings to indicate voltages.
Earlier I took some resistance measurements to get an idea of the pin configuration, but could use a bit of help.
Since this is a Win95 based scope, I'm assuming this larger size encoder is due to older technology and not because it's a high power circuit. Does anyone disagree?
With this being said, I'm guessing most modern sized encoders will electrically work, but I'm uncertain about pin configuration.
Attached are the pins arbitrarily marked by me (1, 2, and 3) and found all the encoders have pin 1 common (Initially I thought this was Vcc, but, after looking at pin configurations online, I believe this is ground).
Pin configurations as I turn the knob are as follows (keep in mind it's a 16 detent):
At position 0 (shaft turned so the flat side is horizontal and the round part is on the bottom) - none of the pins have continuity
One click clockwise - pin 1 and 2 shorted
Another click clockwise - 1, 2, and 3 are shorted
Another click clockwise - 1 and 3 shorted
another click clockwise - no pins shorted (it seems to start over where it was at position 0 because another click clockwise shorts pins 1 and 2 again.
With these measurements, does a certain configuration I should look for when buying a replacement?