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[HP48GX] Testing repaired keyboard
07-25-2016, 05:17 PM (This post was last modified: 07-25-2016 07:21 PM by fnas.)
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RE: [HP48GX] Testing repaired keyboard
(07-25-2016 02:32 PM)mfleming Wrote:  You should need only a single connection to a pad to supply ground to the CPU board.

may be I don't understand well: if I connect one, and only one, pad to the case ground to supply ground to the CPU board, the other 3 pad connection are unnecessary?

If I'm not mistaken I see that the A, B, C and D pads are independents and each is connected to the ground only through its twist tab. So each components connected to the A, B, C, and D pads, have its ground connection. Therefore I'm thinking to connect the 4 pieces of pipe together and then one to ground on the case.

In other words: the PCB needs 4 independent connections to the ground, isn't it?

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[HP48GX] Testing repaired keyboard - fnas - 07-21-2016, 09:29 AM
RE: [HP48GX] Testing repaired keyboard - fnas - 07-25-2016 05:17 PM

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