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Thread: IBM Model M keyboard - not all keys working, what's up?

  1. #1

    Unhappy IBM Model M keyboard - not all keys working, what's up?

    Any idea what might be happening here? The lock lights don't come on and only about 6 or 7 keys actually work... I've tried different cables and computers but still get the same results. I've thoroughly cleaned this keyboard and it looks brand new... for what that's worth.

    Thank you,
    Roger
    Always interested in Atari 8-bit and 486/early Pentium era software & hardware!

  2. #2
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    "Cleaned", how? You may need to remove the backing plate and do a thorough job. There's always the possibility that some traces on the keyboard membrane may be broken. The web has lots of instructions on this.

  3. #3
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    Clean the board using DeoxIt, Isopropyl alcohol, and other things as well. Maybe the padding where the keys hit the board are disintegrated or lost contact.

  4. #4

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    There's no padding in a Model M.

    It's a buckling spring mechanism.
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    IBM Model M keyboard disassembly and repair

    Pretty good, but I think the through-holes and nuts are unnecessary. I prefer short sheet-metal screws threaded into the plastic bosses (drill a pilot hole first). Also, use an ohmmeter to buzz out the traces on the membrane--they have been known to corrode or crack. They can be repaired with conductive silver ink.

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