I usually poke around with a multimeter in continuity mode. Is there a technique I should be using?
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[Help] How do you guys trace a keyboard PCB that has diodes?
- snacksthecat
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- OldIsNew
- Location: US
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What I've typically done is hold one of the multimeter probes on the leg of the diode leading to the controller components, instead of the switch terminal - that way can still use the continuity testing mode with the beep, rather than having to worry about the polarity and watching the multimeter screen.
- Muirium
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That's pretty much what I do, and I've surely done less of it!
I think the general rules are:
I think the general rules are:
- Find the pins on controller leading to the matrix
- Figure out which of those are rows and columns
- Follow as much by eye as you can, and use the beeper as your sixth sense
- Draw a grid, label the columns and the rows, and populate the bugger one key at a time
- And do what Oldie says: keep the diodes out of it, bypassing them when dealing with those pins
- snacksthecat
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I figured something out!!!