Cleaning Copper Contacts?
cclist at sydex.com
Mon Oct 3 09:45:00 CDT 2005
On 10/2/2005 at 2:47 AM Martin Scott Goldberg wrote:
>The exposed copper doesn't look to be underlying.
>Well, here's a pic of what the cart and connector normally looks like -
>As you can see, the PCB is much thicker than a standard PCB of today. I'm
>assuming its made of a different material then (which is why I'm hoping
>people on here in to mini's and such from that period of around 1972 would
>The contacts themselves are what are tarnishing and turning green, some
>with white deposits.
The PCB looks to be of the plain old phenolic variety, still used today in low-cost applications requiring only one or two-sided conductors. It can be brittle, particularly with age, so be gentle.
The contacts themselves appear to be simple tinplate. Try cleaning by gentle rubbing with an ordinary pencil eraser--that should remove enough tarnish to ensure good contact.
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