HP-25 Co-luminous segments
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04-08-2022, 12:01 AM
Post: #11
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RE: HP-25 Co-luminous segments
Luckily, I don't think corrosion is an issue. :-)
I know you can get funny displays by pressing multiple keys at the same time, but it is hard to imagine the keyboard having a hard short as it would show up other operational problems. The same for the display module. This seems to point to a chip problem. As mentioned, because the display/keyboard operate in a multiplexed manner, an oscilloscope would help diagnose the problem. A shame I don't live around the corner, I would be happy to have a look. Careful handling the board, the IC's are sensitive to static discharge coming from you. cheers Tony |
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