HP-67 1705A1636 very bad oxidation looking for suggestions
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12-30-2020, 12:04 AM
(This post was last modified: 12-30-2020 12:58 AM by teenix.)
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RE: HP-67 1705A1636 very bad oxidation looking for suggestions
Maybe some baking soda mixed with water (de-ionised probably better) into a paste to clean the PCB. This should remove any acidic problems, but really only practical on un-populated boards.
Scrub with a soft tooth brush. Dish washing liquid diluted with water cleans the board with little or no residue then dry thoroughly with hair dryer or a warm oven, then afterwards only handle the board by its edges. You can use a PCB lacquer to protect the board after cleaning which will also allow re-soldering. (Note: Not on board surfaces used for keyboard or card reader contacts) Whilst it is a fiddly process, I have used lengths of stripped wire-wrap wire to rejoin broken tracks in the past. Once the insulation is scraped away it has a very small diameter and is plated. The problem with track corrosion is that solder may not take properly or the track remnants may lift from the board from the heat. If there is any manufactured protective coating over the tracks, that will have to be removed. Has the plastic warped at all around the card reader. The "a" key has died on my laptop. I have to paste an "a" into the text every time. I didn't realize how many time I used that letter. Of course it couldn't be a "Q" or similar :-) cheers Tony PS - Finally back home today after 7 months :-)) (12-29-2020 09:33 PM)albertofenini Wrote: Hi Everyone |
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Messages In This Thread |
HP-67 1705A1636 very bad oxidation looking for suggestions - albertofenini - 12-29-2020, 09:33 PM
RE: HP-67 1705A1636 very bad oxidation looking for suggestions - teenix - 12-30-2020 12:04 AM
RE: HP-67 1705A1636 very bad oxidation looking for suggestions - rprosperi - 12-30-2020, 03:15 AM
RE: HP-67 1705A1636 very bad oxidation looking for suggestions - Massimo Gnerucci - 12-30-2020, 08:10 AM
RE: HP-67 1705A1636 very bad oxidation looking for suggestions - teenix - 12-30-2020, 09:40 AM
RE: HP-67 1705A1636 very bad oxidation looking for suggestions - [kby] - 12-30-2020, 04:31 AM
RE: HP-67 1705A1636 very bad oxidation looking for suggestions - albertofenini - 12-30-2020, 09:43 AM
RE: HP-67 1705A1636 very bad oxidation looking for suggestions - albertofenini - 01-11-2021, 10:11 AM
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