Re: Gummy card reader wheels - again Message #7 Posted by Mike Davis on 7 Nov 2000, 10:31 a.m., in response to message #6 by Mike
I may well be wrong on this. I am certainly NO expert on this subject. But I have done quite a few of these repairs on these recently.
But I took a working HP67 apart because I suspected that the card reader actaully needed repair. I had no evidence to justify this. Cards were pulled through the reader. Cards read and wrote properly. Cards had no signs of gummy substance. And no, I don't do that anymore, if it works and the label is undisturbed.
But what I found on the good working 67 card reader, was a very soft wheel. When I removed the wheel reisdue, it was all gummy underneath. There was a thin film of dried gum that let it work. BUT, it was all gummy underneath that surface.
I suppose it is also possible that different models had different substances. But the 67s and 41s that I have seen have all had the problem.
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