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I've got a 20 year old device that uses multiple contact ( silver ) switches that are housed in some type of plastic casing. Needless to say, the contacts are making / breaking contact at random and they need cleaning. It appears that someone has tried this before, as whatever they used left some type of foamy "crust" in the switches. This is probably what is causing the intermittent contact that i'm currently experiencing. As such, here's my question:Has anyone used a cleaner that is strong enough to break this crap down & flush it out WITHOUT eating up old plastic ? While i have several different cleaners i could use, the ones that are probably strong enough to do a good job also tend to play havoc with older plastics. Since these switches are irreplaceable ( i contacted the manufacturer ), i need something that is both strong and safe. Bare in mind that i want to thoroughly flush all of the old crap out of there, so something with a good strong stream might be beneficial. Any suggestions based on past experience with such situations ? Sean
PS... I know that the Rat Shack stuff is "safe", but it really isn't as good of a cleaner as i'd like. Besides, it is a lubricated cleaner and that's what i'm trying to flush out of the switches as it is right now.
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Follow Ups:
I listen to a station on Live365 called Savage Rock (I usually plug in to Savage Rock Broadband , but Savage Rock - Dial-Up is also available to those with a slower connection- the difference is that the Broadband broadcast is in stereo), and that's one of their ads. Sorry, I know this is OT, but I couldn't help it :-)Enjoy,
Deon
__________________________________________
Life is not measured by the number of breaths we take,
but by the moments that take our breath away.
- Author unknown
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Clean with Isopropyl Alcohol and then you need to displace the moisture with a water displacing compound. Caig de-oxit will work fine or just use some aliphatic naptha (lighter fluid). I'm not kidding.The recommendation to use grain alcohol is a good one as well. The only reason I would balk at all would be due to flammability. However, if you're sure your circuit isn't charged go for it.
Cut it with distilled water if the thought of a flash fire scares you.
John Hagensieker
Tech Rep
NAVAIR Corrosion Control Program / Avionics Corrosion Control Program
NATEC Detchment Iwakuni Japan
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Alot s said about CAIGs which I was told it's main active ingrediant is equivlent to Lighter Fluid. I am not certain about this and would have to verify!I used Brasso recently then Isopropyl Alcohol with adequate results.
If you use 190pf. Grain Alcohol make certain to recap it tight or ellse it will evaporate fast.
Why not just change the unit; these are quite cheap.
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I could be wrong, but I would use pro electronic grade isopropyl alcohol. This works OK, and will not screw up much. Also, use bottled air to push out the alcohol from the part.
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Or generic equivalent. 190-proof grain alcohol available from liquor stores. When I asked for this at a large store outside of Washington, DC, the owner mentioned that his biggest customer for it is NASA's Goddard Space Flight Center: Their standard cleaner for switch/relay contacts and tape heads. It evaporates fast and leaves no residue. John's suggestion of compressed air sounds good.Warning: Try at your own risk, as I don't know what it will do to your kind of plastic. (My bottle does have a plastic cap, however.) If it totally screws up your switches, try combining with your mixer of choice and sip until it no longer hurts.
nt
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I drank everclear shots a few times. The last time I did it, I wound up (after emptying the bottle) thinking it a good idea to light the inside of the empty bottle. That was REALLY wise, as it burned the hell outta my hand, erupting like Vesuvius ;) Needless to say, I keep clear of it now.
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Thanks John. That's a good and simple suggestion. I wonder why i didn't think of it myself ??? : )
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