- 2026
- Feb
- 4
A Leader LBO-310A Oscilloscope - Part 3: Considerations.
This Leader LBO-310A needs a new vertical position pot. This one:
The carbon trace on the wafer is bad, and has a worn spot right about where you’d have it centered. However, this is an oddball part. It’s got a shaft size that’s not really anything normal - as best I can tell with my crude calipers it’s slightly less than a normal 6mm. The mounting is also an odd size, I can’t find anything that fits in the hole. Things are either too big or too small.
My plan is to put it back in the hole, remove the wires, and just leave it as a dummy. I’ll put a new pot on the back. This pot right here:
While this one mounts in the hole (it’s a little small) the original knob does not fit on the shaft. I’m going to unsolder the wires on the PCB and run these to it, while mounting the pot in a small hole on the back.
If I ever find a replacement, I can just reconnect the front panel device and leave the new one on the back as a spare. I went ahead and prepped things, but didn’t feel like drilling - that’s the next part.
Next part of this series: Coming soon.
Previous part of this series: https://wereboar.com … pe-part-2-diagnosis/