Tom, Motorola does not now, and never has, recommended DeOxit or any other contact enhancer "gunk" besides Stabilant 22. Up until just a few years ago, Motorola specified Stabilant 22A, under part number 1180369E78, which is a mixture of pure Stabilant 22 and isopropyl alcohol. Today, Motorola sells a kit under part number 1180384V93 which comprises a 5 ml bottle of pure Stabilant 22, an empty 15 ml bottle, and some tiny swabs. The user then puts 2.5 ml of the Stabilant 22 into the 15 ml bottle and adds 10 ml of 99% isopropanol to make a working solution of Stabilant 22A, or adds 10 ml of pure ethanol to make a working solution of Stabilant 22E. Either solution is extremely effective if applied wet to clean connectors immediately before mating. It is also effective in curing intermittent contacts in card-edge connectors in PCs and electronic instruments. The alcohol solvent is essential for the product to work; undiluted Stabilant 22 is ineffective. Drug-store isopropyl alcohol, aka rubbing alcohol, should not be used since it is diluted with water and will interfere with Stabilant's action.
The 1180384V93 kit is sold by Motorola Parts for about $47, but is sufficient to last for years. 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of w9srv Sent: Saturday, September 04, 2010 10:28 AM To: [email protected] Subject: [Repeater-Builder] Micor Pin "Gunk" Hi Guys! I am in the middle of rebuilding a receive site for one of the area repeaters and have come across some interesting "Pin Gunk". I've been told that Motorola techs years ago used to apply some kind of "goo" to help with the connection on all the backplane pins, etc, but I don't know if this is what that is. This receive site has been developing some intermittant issues on several fronts, and maybe this explains them. The problem with this gunk is that is is non-conductive and a real bugger to clean off. DeOxit seems to work the best. I made this quick video last night showing this on the pins of the power control board. Here is the link to the video: http://www.youtube.com/watch?v=tmWumkQetdY Has anyone else ever come across this? Are there any other steps other than cleaning it off to ensure it will not be another problem in the future? Thanks! Tom W9SRV
