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> What's Hiding Under Relay Board, Gremlins You Don't Need
914Sixer
post Oct 6 2020, 04:43 PM
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Cleaning up another round of relay boards. This one looked clean but this is what I found. Some of that nasty green stuff that goes after copper.


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seanpaulmc
post Oct 6 2020, 07:13 PM
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What do you clean them up with before resealing?
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914Sixer
post Oct 7 2020, 06:53 AM
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Putty knife, small screw driver and 1 hr of picking, then a bath of lemon juice. Stiff bristle bush to go over the copper tracks with the lemon juice. You may have to go over them several times to clean corrosion.
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VaccaRabite
post Oct 8 2020, 10:25 AM
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Are you re-potting or pouring in epoxy resin?

Zach
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76-914
post Oct 8 2020, 10:33 AM
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Any acid used, even Lemon juice, needs to be neutralized and thouroughly cleaned or the green will return with a vengeance. I wonder what those boards look like from the east coast area?
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bob164
post Oct 8 2020, 10:52 AM
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Whats the best way to neutralize the acid?
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73-914
post Oct 8 2020, 11:01 AM
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baking soda
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bob164
post Oct 8 2020, 11:09 AM
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Thanks
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trojanhorsepower
post Nov 11 2020, 07:25 PM
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So I am working on this now. I have read about people solder the joints before repotting. When I tried I had trouble not melting the plastic around the joint. Also I am having trouble getting the solder to stick. I am pretty familiar with solder in more normal electrical work, but this has me baffled. I have used all the flux I have and nothing seems to help.

Any tips?

Thanks

Peter
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914Sixer
post Nov 11 2020, 07:45 PM
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Not needed in my opinion. I have done close to 100 boards at this point. I have never found a problem with the joint. -6 boards are slightly different in that they did soldier the bottom in 4 places.
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trojanhorsepower
post Nov 12 2020, 05:00 PM
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Great,
Ill just repot it.

Thanks,

Peter
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trojanhorsepower
post Nov 12 2020, 06:05 PM
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So how bad an idea would it be to bead blast both sides of the board?
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