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  • LK201 disassembly

    From Lars Brinkhoff@21:1/5 to All on Mon Nov 11 14:12:57 2019
    Here's a photo:

    http://lars.nocrew.org/tmp/lk201.jpg

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  • From Lars Brinkhoff@21:1/5 to All on Mon Nov 11 13:45:55 2019
    Hello,

    I'm trying to disassemble/repair/replace a LK201 keyboard. Does anyone
    know how to pry loose the 8051 PCB from the keyboard matrix board? Is
    seems there's some kind of clamp holding it roughly in the middle.

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  • From Richard@21:1/5 to All on Mon Nov 11 19:36:16 2019
    [Please do not mail me a copy of your followup]

    Lars Brinkhoff <lars.spam@nocrew.org> spake the secret code <7w7e46qz6e.fsf@junk.nocrew.org> thusly:

    Here's a photo:

    http://lars.nocrew.org/tmp/lk201.jpg

    Have you looked at the relevant VT220 maintenance documentation? <http://manx-docs.org/search.php?cp=1&q=vt220&on=on>
    --
    "The Direct3D Graphics Pipeline" free book <http://tinyurl.com/d3d-pipeline>
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  • From Lars Brinkhoff@21:1/5 to Richard on Tue Nov 12 05:44:00 2019
    Richard wrote:
    Have you looked at the relevant VT220 maintenance documentation?

    Yes, I think I have read it all. There are detailed instructions for
    the terminal itself, but about a damaged LK201 they just say "replace
    the whole keyboard".

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  • From Phillip Helbig (undress to reply@21:1/5 to lars.spam@nocrew.org on Tue Nov 12 05:53:22 2019
    In article <7wh839ps2n.fsf@junk.nocrew.org>, Lars Brinkhoff <lars.spam@nocrew.org> writes:

    Richard wrote:
    Have you looked at the relevant VT220 maintenance documentation?

    Yes, I think I have read it all. There are detailed instructions for
    the terminal itself, but about a damaged LK201 they just say "replace
    the whole keyboard".

    Which is why I have about a dozen on my shelf, so sitting at my terminal
    I'm sort of like Angus Young in front of his Marshall stacks. :-)

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  • From Scott Dorsey@21:1/5 to lars.spam@nocrew.org on Tue Nov 12 09:28:23 2019
    Lars Brinkhoff <lars.spam@nocrew.org> wrote:
    Richard wrote:
    Have you looked at the relevant VT220 maintenance documentation?

    Yes, I think I have read it all. There are detailed instructions for
    the terminal itself, but about a damaged LK201 they just say "replace
    the whole keyboard".

    The docs aren't useful because I don't think you're supposed to take the keyboard apart. I suspect that where you are at now might be a point where desoldering keyswitches becomes essential.

    What are you wanting to replace that requires complete disassembly?

    I am very pleased to see a Cherry encoder in there, though.
    --scott
    --
    "C'est un Nagra. C'est suisse, et tres, tres precis."

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  • From Lars Brinkhoff@21:1/5 to Scott Dorsey on Tue Nov 12 16:43:18 2019
    Scott Dorsey wrote:
    The docs aren't useful because I don't think you're supposed to take
    the keyboard apart. I suspect that where you are at now might be a
    point where desoldering keyswitches becomes essential.

    I did finally pry it off by bending gently with a flat screwdriver.

    What are you wanting to replace that requires complete disassembly?

    I'm considering replacing the 8051 PCB and put another board in there
    with some updates. For example, I dearly want a Meta key. Someone
    pointed out it might be easier to just replace the 8051; that may also
    be an option.

    I also need to check out the keyboard matrix. Some keys seem dead and
    other trigger two keypresses.

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