[GreenKeys] M28 ASR jammed keyboard

[Duncan Brown]

John & Bruce,

Thanks for your help!

I'll have to wait until next Tuesday, when I'm back at the Museum to try 
it out.
(Didn't feel like dragging the M28ASR home to work on it!)

Thanks 7 have fun,

Duncan
K2OEQ

On 13-Dec-22 22:36, John W9DDD wrote:
> You can remove the hood without taking the keyboard out of the ASR.  You can then see all the mechanism from the bottom side.  The top plate stays in place if you just remove the hood only.
>
> Removing the plastic plates and labels on both sides reveals the screws to remove for the removal of the hood.  There's also screws for the top plate, leave those in.
>
> There are also two screws on the bottom side or the hood at each end.  You may wish to remove those first?
>
> Any chance something sat on those keys during storage?
>
> John, W9DDD
>
>
>> On Dec 13, 2022, at 8:48 PM, Duncan Brown <duncanancy at earthlink.net> wrote:
>>
>> Just pulled a M28 ASR out of storage that had been working, but now it has a  jammed keyboard.  Both the [N] and [LTRS] keys are stuck down. (I think the [M] was stuck originally, but it seems OK now) There is no [KYBD LOCK]  button on this keyboard. Printer & tape reader run fine. (Jingle Bells tape sounds much better on this M28 than on M15!)
>>
>> What is a typical cause of these keys sticking ? (I thought all those ball bearings were supposed to prevent that)
>>
>> How do I fix it? Not obvious how to get into the keyboard and I image if you take the top plate off the keyboard, you will have a heck of a time getting all the keys back in!
>>
>> Looked at Bul 249 & 1169, but they were not much help. Parts manual (B1169) does not show how keys sit in keyboard cover.
>> #573-117-702 gives some disassembly instructions, but no diagrams of what they are talking about. (They do reference tho parts manual, but not too helpful if you don't know what you are looking for.)
>>
>> I have pulled a chassis from a M28 KSR before. There was a metal cabinet piece across the top of the keyboard that could be removed from inside the cabinet to free the keyboard.
>> This ASR cabinet seems to only have a release/break of the metal strip above the keyboard on the right side of the keyboard.  The metal piece above the keyboard seems to run to the left, around the perf and be solidly connected to the cabinet. Yet this piece must be removed to remove the LAK keyboard & base?
>>
>> Can anyone give me some direction?
>>
>> Thanks,
>>
>> Duncan
>> K2OEQ
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