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[HP48GX] Testing repaired keyboard
07-26-2016, 02:42 PM
Post: #10
mfleming Offline
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RE: [HP48GX] Testing repaired keyboard
One way to determine if the four pads are independent of one another would be to use a continuity tester on pairs of pads. As a practical matter, I would expect the PCB to have a single ground plane that uses one or more twist ties as a return path to the batteries.

~ Mark
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[HP48GX] Testing repaired keyboard - fnas - 07-21-2016, 09:29 AM
RE: [HP48GX] Testing repaired keyboard - mfleming - 07-26-2016 02:42 PM



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