Author Topic: faston connector tarnish  (Read 833 times)

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Offline aniketTopic starter

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faston connector tarnish
« on: March 06, 2020, 04:14:04 pm »
Hi Guys ,
I have started using 6.3mm Faston connector in my diy amps for sometime as they provide easy assemble in tight spaces . I made some amps for my frnds 6 months back and one of the amp came back due to a blown mains fuse.
Then I discovered that the all of the faston connectors in the amp board has tarnished some had bluish green coating on them some had a blackish residue , when new the connectors where shiny mostly silver coating not sure though.
I want to change the these connectors , I have two options either i go with TIN plated connectors or Silver coated connectors which should I choose , is there a way to check the connectors aging ?
Pictures of tarnish connectors below
 

Offline Tomorokoshi

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Re: faston connector tarnish
« Reply #1 on: March 06, 2020, 05:58:36 pm »
Can you get some clear pictures of the bottom of the board in IMG_20200304_003956(1).jpg?
 

Offline David Hess

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Re: faston connector tarnish
« Reply #2 on: March 07, 2020, 12:37:56 am »
If the connectors are tight, then tarnish should not be a problem unless it indicates ongoing corrosion.
 

Offline T3sl4co1l

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Re: faston connector tarnish
« Reply #3 on: March 07, 2020, 01:29:56 am »
Better to keep them well away from moisture, condensation, humidity, whatever.  Salt spray especially, and the color of corrosion on the one looks like some salty residue was likely involved.

You may find a tighter, closed or even sealed, connector is better than open Fast-Ons.  If the chassis can be made in such a way that drips don't enter, that's something.  If airflow is mandatory, perhaps a fan and filter could be fitted, or larger external heatsinks used.  There are rubber boots for Fast-Ons, but they don't really seal; might help a little.

All about how much cost-reliability tradeoff your application has available.

Tim
Seven Transistor Labs, LLC
Electronic design, from concept to prototype.
Bringing a project to life?  Send me a message!
 

Offline Vovk_Z

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Re: faston connector tarnish
« Reply #4 on: March 09, 2020, 09:41:20 am »
It don't look very bad as for me (as I can see on a first photo).
Those one on the last photo (green ones) - definitely looks bad.
Something eat them. Better to find what it is.
I don't know definitely but I think silver-plated ones will have the same problem.
« Last Edit: March 09, 2020, 09:46:48 am by Vovk_Z »
 

Online wraper

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Re: faston connector tarnish
« Reply #5 on: March 09, 2020, 10:15:35 am »
It's obvious liquid damage and faston connectors are the least you need to worry about. Other connectors and fuse holder have corrosion on them as well and god only knows what is happening under components.
 


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