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Brymen BM235 InEr issue

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Sebaxtian:

--- Quote from: floobydust on July 28, 2024, 05:55:16 pm ---It seemed to get worse after you took it apart and cleaned it, then got better, is that right? I think it just needed to dry off, some IPA has added water.

What lube did you use on the rotary switch? That topic will start another war here. How did the rotor wipers look, I use a paper swipe to clean it.
I thought they used mineral oil on the PCB. I use DeOxit F5 with PPE with no problems, although it has little lubricant in it.
Grease is a bit much - lithium salts conduct a little, silicone grease reacts with nearby components.

I thought the BM235 has had issues with the rotary switch needing a spacer, and the input jacks might crack. Not sure but just to alert that it could be a mechanical problem.

--- End quote ---

After the cleaning, the board had enough time to dry, more than half an hour, so I think that wasn’t a problem. To grease the traces I used some grease from the rotary switch, I took a bit from there and spread it on the board, I used just a bit.

J-R:
Based on the information provided, my 2 cents is that this was only an input jack contamination issue.  The bottom of the jack can collect quite a bit of environmental junk as well as metal shavings, and the delay after cleaning seems reasonable.  Further flushing/cleaning might be a good idea.  And of course both the A and mA uA jacks are able to contribute to the issue.


Are those traces partially worn through or is it just the coating?

I'm firmly in the add lubricant to contacts camp after taking apart a few DMMs and seeing the shocking amount of wear and metal dust.  I used SuperLube a couple times and never had any issues, but now I think I've settled on CRC 2-26.
 Either way, I just apply tiny amounts to only the wear points and it really smooths the selector operation.  My perspective is I'd rather have to clean dried gunk off a board 20 years from now instead of trying to recreate worn contacts/traces.

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