[GreenKeys] Re: 28 ASR Keyboard

[Richard M. Gillingham]

I can think of one other possibility,  (pardon the rotten terminology) 
if one of the little 'arrows' breaks off and jams in the trough of ball 
bearings that is used to prevent simultaneous keystrokes.   Not common, 
but I've seen it in a machine that wasn't properly maintained.

Gil, W1RG

Don Robert House wrote:

> There are several things that can cause the keyboard to lock up. The 
> most common is either the gear on the typing unit is not meshed 
> properly (due probably to lack of typing unit hold down screws.) OR
> the keyboard clutch has  a broken spring.  There is also a mod kit on 
> some machines to lock the keyboard with certain codes or with red 
> keys.  The red keys have separate connections to the machine from the 
> green ones.
>
> Don
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