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April 11th 07, 03:02 AM
posted to rec.radio.amateur.boatanchors
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Chassis cleanser ??
TU Richard.
Richard Knoppow wrote: "wb5kcm" wrote in message ups.com... On Mar 10, 6:30 am, Dave wrote: I have just started to restore a HQ-145. The external cabinet is 9.7+ and is fine [for now] The chassis needs a good mechanical clean up. What is a good 'stuff' to remove hard cased surface dust and some minor staining/discoloration? If the 'stuff' exists, is it commonly available? I use some stuff called "Hood Cleaner" made by RubaChem Inc. Computer maintenance division, PO Box 9841, Englewood, NJ 07631, 1-800-548-3285. This is a foaming type cleaner. You spray it on and let it sit for a while. It will loosen up the cooked on dirt etc. Seems to be real safe on plastics etc. I would not use it on silk screen labels, especially on dials that type. Avoid spraying on components that can absorm moisture. Spray it on a cloth and wipe around sensitive components or areas. It really works wonders on cigarette smoked up plastic. Hope this helps. 73 de Randy, wb5kcm FWIW, I worked for Hewlett-Packard a great many years ago in a factory repair facility. We routinely washed entire instruments using a mild solition of dishwashing detergent in water. This was sprayed using a paint spray gun. After washing the chassis was rinsed off using plain water and then blown out with compressed air. Then it was baked in an electric oven running at about 130F for a minumum of 48 hours. I usually left stuff in for a longer time. I don't remember any more if we had any kind of brush but I suspect we did. Before washing certain parts were removed. This included meters, rubber stuff (because of the heat) and hermetically sealed transformers and inductors. The reason for the latter was that if the transformer did not have a perfect seal (and many did not) some moisture would get in and wouldn't bake out causing short. This was a long time ago but I don't remember that any instruments were not washable. Note that the detergent is the kind for hand washing, not dishwasher detergent. At least some of these instruments had ferrite core inductors. I don't rememeber any difficulty with these but would be careful nonetheless because there are many kinds of ferrites and some may not like getting wet. Most of the spray on cleaners appear to be about the same as the "streak free" type glass cleaners using butyl alcohol. While this is safe on many materials it _will_ attack certain plastics so I avoid it for anything but glass. |
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