Ender 3 V2 rotary encoder issues

It's been 3 years since I bought my first 3D printer - Ender 3 V2. For the last 1 year, I didn't use it much and started using it again recently.

This time when I started the printer, I noticed that the rotary knob on the display unit is not following the proper steps. It randomly goes up and down the menu items even if I rotate it in one direction.

I'm not sure if the rotary encoder has gone bad or some other component on the PCB. I tried resetting the printer but still the issue persists.

Anybody has faced similar issues with ender3 printers?

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Jan Cumps 5 months ago

first suspect: the encoder contacts, and the two caps on the A and B pin that do debounce duty

2nd suspect: rail noise
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aswinvenu 5 months ago

I have seen a lot of people complaining about the Ender3 (v1) rotary encoder. The cheapest option is to replace them and try.
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rsjawale24 5 months ago

Thanks!
I will try to replace it and see if it works.
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dougw 5 months ago

Most likely it is due to switch bounce. Try varying the speed of rotation, either slower or faster, to minimize bounce issues. Also exercise it a bit by rotating to clean the contacts as much as possible. There are some other ways to reduce bounce problems, but try the simple approach first.
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rsjawale24 5 months ago in reply to dougw

Already did that. Even at slower rotation speeds, it jumps up and down in the menu. I think the encoder has become faulty and replacement is the only option now.
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rsjawale24 5 months ago in reply to $parentForumReply.Author.DisplayName

Unfortunately, it was the only affordable 3D printer available to buy at that point of time. Now there are much better options in similar price range.
I recently got a Bambu Lab A1 so the ender 3 will be given away. Just wanted to make sure it works before I give it to someone.
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gsgill112 5 months ago

Yes, I too faced a similar issue, Initially I ordered a replacement Rotary encoder from my local electronic store, and tried the replacement but that didn't work. So, after desoldering the existing Rotary encoder, I opened up the package to find it relatively simple. , some rubbing alcohol, ear buds and gentle rubbing completely fixed the issue, now its as good as new.

P.S. the existing one is relatively simple to open and clean. also, The outer metal housing is Kinna flimzy, I recommend to carefully remove it without rocking the locking legs much, also during reassembly bending the metal cover so as to exert pressure on the contacts helped.

If you need any further assistance please feel free to ping me.
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rsjawale24 5 months ago in reply to gsgill112

Thanks! I will try this. I'm not at home currently, will check it by end of the month. Will ping you if I get stuck or do not understand something.
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