 Did original relay boards have plastic melted near traces? |
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| DaveB |
 Mar 5 2022, 08:05 PM
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#1
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Member  Group: Members Posts: 165 Joined: 25-November 21 From: Portland, Oregon Member No.: 26,107 Region Association: Pacific Northwest 
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I'm removing the tar off the relay board. I'm finding areas which look like a soldering iron touched and melted the plastic. I don't know if this was used to tack down some of the traces or something else. One area looks like someone laid down a soldering tip.
   Was this normal or something else? Thanks, DaveB |
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Replies(1 - 8)
| Superhawk996 |
Mar 6 2022, 04:50 AM
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#2
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914 Guru Group: Members Posts: 5,900 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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Normal
It is heat staking used to hold the traces in place during assembly. Both boards I’ve cleaned had same heat staking in places on the board. If you look carefully you’ll see they melted top down toward the trace. If the trace had overheated they would be melted at the base where the trace sits. |
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| 914Sixer |
Mar 6 2022, 07:43 AM
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#3
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914 Guru Group: Members Posts: 8,906 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Yes they are all that way.
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| DaveB |
Mar 6 2022, 02:55 PM
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#4
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Member Group: Members Posts: 165 Joined: 25-November 21 From: Portland, Oregon Member No.: 26,107 Region Association: Pacific Northwest
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Great - Thanks for the help.
After I check out and repair the board, I was going to use a clear epoxy instead of the tar to seal the traces. My other option is to use an RTV with a vacuum. Anyone have issues using an epoxy for the environmental seal? Thanks, DaveB |
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| GeorgeKopf |
Mar 6 2022, 08:07 PM
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#5
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Member Group: Members Posts: 172 Joined: 9-February 21 From: Princeton, NJ Member No.: 25,186 Region Association: MidAtlantic Region |
I posted this question about three different types of relay boards.
http://www.914world.com/bbs2/index.php?sho...=355156&hl= George |
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| DaveB |
Mar 6 2022, 09:43 PM
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#6
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Member Group: Members Posts: 165 Joined: 25-November 21 From: Portland, Oregon Member No.: 26,107 Region Association: Pacific Northwest
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QUOTE(GeorgeKopf @ Mar 6 2022, 06:07 PM)  I posted this question about three different types of relay boards. http://www.914world.com/bbs2/index.php?sho...=355156&hl= George George, Thanks for the link. I didn't expect to see so much variability in these relay boards. DaveB |
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| Van B |
Mar 29 2022, 06:23 PM
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#7
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Senior Member Group: Members Posts: 1,612 Joined: 20-October 21 From: Maryland Member No.: 26,011 Region Association: None
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I took my relay board off to clean it and discovered the underside was cracked like the Nevada salt flats.
So, I ordered some of this stuff to give it a good reseal: https://www.amazon.com/MG-Chemicals-Black-R...d/dp/B07B3Z8CLY |
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| robkammer |
Mar 30 2022, 08:48 AM
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#8
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Member Group: Members Posts: 179 Joined: 7-January 21 From: Vermilion Ohio Member No.: 25,049 Region Association: North East States |
QUOTE(Van B @ Mar 29 2022, 08:23 PM) I took my relay board off to clean it and discovered the underside was cracked like the Nevada salt flats. So, I ordered some of this stuff to give it a good reseal: https://www.amazon.com/MG-Chemicals-Black-R...d/dp/B07B3Z8CLY I took the easy route and bought a refurbed board from BDStone, pretty sure he uses black Flexseal and it's really nice. |
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| Van B |
Mar 30 2022, 09:51 AM
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#9
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Senior Member Group: Members Posts: 1,612 Joined: 20-October 21 From: Maryland Member No.: 26,011 Region Association: None
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I considered that, but mine cleaned up really nice and I like the idea of using modern flame retardant circuit board epoxy (potting compound). This stuff will probably outlive me given the service temp is -40F to 347F. The engine bay heat won't even come close to pushing it's performance envelope.
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