General > General Technical Chat
Problem with rigol scope knob
Zyvek:
--- Quote from: wd5gnr on December 29, 2010, 08:36:23 pm ---
Rigol has offered to send me a new UI board under warranty which is SUPER of them. Haven't got it yet though. I did buy from a US distributor, by the way.
--- End quote ---
You are quite the master, going beyond breaking the warranty seal, and still getting warranty service! Awesome, plus kudos to Rigol for the service as well!
Mechatrommer:
--- Quote from: wd5gnr on December 29, 2010, 08:36:23 pm ---Well it turns out it was both.
--- End quote ---
both what?
wd5gnr:
Both the encoder and something on the board. Originally the motion was jerky in one direction and then it became almost nonexistent. Replacing the encoder got me back to jerky and replacing the diode made it work 100%. My guess is the diode was bad from the start. Then the constant pulling and twisting on the encoder to try to get it to unstick took the encoder out.
Mechatrommer:
so i guess it was the diode only, not the encoder. from what i understand of your post #35.
wd5gnr:
No, I think it was both. Let me put it in time order.
1) New scope. I noticed that sometimes the trigger level was "flaky"
2) Soon I can only adjust the level up noisily. So you can reset to the baseline (push the button) and move up, so it was usable. At this point, I think the diode had completely failed.
3) Assuming it was the encoder I am twisting the encoder, trying to pull it out while turning, push it in, etc. Contact cleaner, compressed air, etc. Nothing helps.
4) Over a few months the problem becomes worse. Now twisting the encoder knob just causes the trigger level line to jump up and down maybe one step in either direction. The only way to get useful position is to use the 50% key. At this point, I think the encoder has failed.
5) I take the thing apart and clean and respring the encoder several times. No change.
6) I replace the encoder. Now I am back to the behavior in #2, so the new encoder did change the behavior. It just still didn't work.
7) Replacing the diode under the encoder restores normal function.
So I think the encoder was OK to start with, but eventually failed prior to me opening the thing up.
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