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[HP48GX] Testing repaired keyboard
07-24-2016, 11:59 AM
Post: #3
RE: [HP48GX] Testing repaired keyboard
Keep in mind that in the 48S and 48G series, the 'ON' circuitry is NOT part of the regular keyboard matrix.

The 'ON' key provides a direct battery connection to a pin on the main processor IC.

Schematic here:

http://www.hpcalc.org/details.php?id=3543

TomC
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[HP48GX] Testing repaired keyboard - fnas - 07-21-2016, 09:29 AM
RE: [HP48GX] Testing repaired keyboard - TomC - 07-24-2016 11:59 AM



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