[GreenKeys] M28 ASR jammed keyboard

[Duncan Brown]

John,

I think originally, there were three keys stuck down; [N] {M] & [LTRS]. 
No other keys (other than the red ones on the top row) would move. I 
tried pulling up on the stuck keys and also pressing on the code levers 
in between the keyboard and printer.  I didn't think I accomplished 
anything, but looking at the picture I took, it looks like the [M] key 
is OK now.

Thanks,

Duncan
K2OEQ

On 15-Dec-22 08:57, John, W9DDD wrote:
> All good suggestions from folks, but I keep coming back to the fact 
> there are two keys down.  Do they lift if you try to pull up slightly? 
> Watch out if you do take off the hood for falling ball bearings?
>
> ---
> ----
> You said "tomorrow" yesterday.
>
> The above comments or recommendations are SWAG. Use at your own risk.
> John, W9DDD
>
> On 12/14/2022 11:59 AM, Duncan Brown wrote:
>> 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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>