HP-97 card reader repair question Message #1 Posted by David Ramsey on 12 Jan 2006, 4:20 p.m.
OK, almost done with Easterling's 97. The keyboard problem was due to the fact that someone had worked on the calc previously and re-installed the white plastic keyboard spacers incorrectly: instead of spacer-gold foil-spacer it had been put back together as gold foil-spacer-spacer. This lifted the contacts another millimeter or so and prevented the "0" key from making good contact when pressed.
The broken battery contact was replaced with a good contact from an HP-82162A printer with a bad print head.
The card reader wouldn't pull cards, so I took it apart. The rubber roller was in the "rock hard stage just before gummy", so I scraped it off and replaced it with standard O-rings. The inside of the reader, including the read/write head, was kinda dirty so I cleaned that up as well (btw, ultrasonic jewely cleaners work great for cleaning those nylon balls).
The reader now pulls cards very well and will write cards my other calcs will read, but reading a card always produces an "ERROR" display. Any ideas? I have another 97 card reader I can use if I have to...
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