- 2026
- Feb
- 5
A Leader LBO-310A Oscilloscope - Part 4: Repair and Wrapup.
I’ve been unable to find a replacement potentiometer for this device, Leader seems to have used something made just for them. The new parts I purchased won’t fit in the hole in the front, and the knob won’t fit on anything I have on hand…so, I’m just going to replace it as seen in the last post.
A small hole was drilled into the back, and a pot mounted:
Stick a knob on it. I had … yellow. I need to get a blue one.
Run the wires to the front, remove the old ones, and solder in new ones.
I didn’t have any green. I thought I did, but the electrons don’t care. Brown was used. If I ever do find an actual replacement, it won’t be much trouble to move the wires back to the front.
The CRT doesn’t have any rotation controls, and the trace is a little lopsided. There are two screws with bands that hold the CRT in place. Those were loosened, the CRT adjusted, and the pot checked for ability. Everything lined up as expected.
It’s still just a hair crooked, but when you tighten the bands it does move a bit. I will probably clean that up at a later date. But for now, everything seems to be acting as expected.
A small CRT scope can be invaluable for audio and low-frequency signals, so this one goes on the bench.
That wraps up this repair. I wish I’d been able to get the actual potentiometer to repair it, but I’m ok with what I did to it. As the show season is approaching, I’ll keep an eye out for potential repair items.
Observations: https://wereboar.com … part-1-observations/
Diagnosis: https://wereboar.com … pe-part-2-diagnosis/
Considerations: https://wereboar.com … rt-3-considerations/
Repair: You’re reading it now!
That’s all. More good junk on the way.
Previous part of this series: https://wereboar.com … rt-3-considerations/