I have an HP67 which has a common segmment out on each digit of the display. Does anyone know where I can get a schematic or pinout of the 5x7digit LEDs and display driver chips? How about replacement parts? Thank you much if you respond.
HP-67 repair display
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09-23-2001, 10:58 AM
09-23-2001, 01:49 PM
Numbering the pins on the displays as on a normal DIL IC package, with pin 1 on the top right, the pinout seems to be :
10-02-2001, 11:12 PM
Thank you Tony!
10-03-2001, 06:44 PM
The keyboard is a 5*8 (IIRC) matrix. The column lines (5 of them) go to pins on the ACT CPU. The row lines come from the same lines that drive the display
10-11-2001, 09:54 PM
Thank you for the guidance Tony. I found a B-E short in the transistor closest to the power connector; it's now working well. Even the battery pack (labelled 1984 ) is holding a good charge. I find myself spending hours reading the book and programming it (just a geek at heart ). |
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