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#1
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wrote:
I have a Radio Shack Pro-43. My 3 button was not working on the keypad so I disassembled and cleaned the circuit board and the back side of the rubber keypad with rubbing alchohol. Now most of the keys do not work. I thought I was cleaning gunk off the contacts when I probably cleaned some type of conductive gel off the keypad. The stuff most companies use on these pads is similar to the consumer product commonly called "Liquid Solder." There were two varities, one that requires heat and a flexable one that doesn't. Obviously, you don't want the one that requires heat. Sadly, the non-heat flexable stuff is almost impossible to find anymore (it's also hard to use - hard to spread evenly over the surface). But I've found a fairly good alternative. The pens used to repair traces on circuit boards contain conductive inks that seem to work fairly well on flexable pads. Radio Shack has one called the "Greg CircuitWriter" conductive ink pen (item 910-3890, special order only). I've never used this specific product but, if it's typical, put two coats of this (giving each coat time to dry before the next coat) fully over the center contact of each pad, being careful not to get it anywhere else on the pad. This should last almost as long as the original material and can be cleaned off and replaced if necessary. By the way, if you do find the flexable Liquid Solder, make sure to use only one very thin coat and spread it evenly. Good luck. Dwight Stewart (W5NET) http://www.qsl.net/w5net/ |
#2
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Dwight Stewart k.net...
^ wrote: ^ ... Radio Shack Pro-43. ^ ... most of the keys do not work. ^ ... product commonly called "Liquid Solder." ^ .. good alternative. The pens used ^ to repair traces on circuit boards ... Thanks Dwight. I'm having to press very hard on the buttons of my 20 year old PRO-43 so I might use your alternative. Frank |
#3
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![]() "Frank" wrote: Thanks Dwight. I'm having to press very hard on the buttons of my 20 year old PRO-43 so I might use your alternative. It works. Of course, as others have stated, if you can get a replacement keypad, that is the easiest way to go. But recoating the pads may be the only hope for older scanners with no replacement available. Take care. Dwight Stewart (W5NET) http://www.qsl.net/w5net/ |
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