If all of the other keys work, that largely rules out a defect in a trace/connector pin/scanner HW/etc which would affect an entire row or column.
Check across the switch and see if an ohm meter reads 0 when pressed. -- Erik On Fri, Aug 1, 2025, 6:11 PM Dave J <[email protected]> wrote: > Hello. I have this TRS-80 Model 100 and everything on it works perfectly, > except for the "M" key. It appears to be dead. I've removed the keyboard > but am unsure what solder points are connected to the ALPS SKFL KEYSWITCH > for the "M". Of course, I'm assuming that's the actual issue. Below is a > link to a picture of where I think the points are. Just looking for > confirmation and/or any other suggestions. Thanks. > > > https://drive.google.com/file/d/1iphU2F74vhoVyIJoLz2qBF6LcnqgJXim/view?usp=drive_link > > Dave >
