Sudden death of the HP 239X terminals by whiskering

Probably best? to? do this? clean up on the chassis? before applying power to prevent? whiskers? from? conducting to? ?easy to destroy components? ? thanks? for the heads up... ? ed# www.smecc.org? ? In a message dated 6/6/2018 3:41:29 AM US Mountain Standard Time, cctech at classiccmp.org writes: ? Inspecting a newly acquired HP 2392A I found out the chassis was prone to whiskering all over the chassis. Whiskers are small metal hairs growing from pure metal (zinc or tin) and can when they connect to a power line create a shortage and electric arc damaging the electronics. Made some pictures and placed them in: https://www.flickr.com/photos/hp-fix/41897770664/in/dateposted-public/ It's best to remove them by using scotch brite or fine sanding paper, after that paint or coat the chassis with a clear paint or other nonconducting paint. More info about whiskering can be found at: https://nepp.nasa.gov/whisker/ https://en.wikipedia.org/wiki/Whisker_%28metallurgy%29 -Rik