Date   : Wed, 23 Oct 2002 15:42:18 +0000
From   : c.j.thornley@...
Subject: Re: BBC keyboard playing up

Hi,
It sounds like it could be your keyboard ribon cable. As these where a comomn
fault. Try reversing it to see if problems shifts. If its the keyboard cables
you probally have to make one up.

Chris
> 
> From: Michael Foot <mjfoot@...>
> Date: Wed 23/Oct/2002 08:34 GMT
> To: bbc-micro@...
> Subject: [BBC-Micro] BBC keyboard playing up
> 
> Hi all,
> 
> One of my BBC model B's has had an unusual fault with the keyboard recently.
> On and off, some of the keys will just stop working. Often from switch
on the full keyboard will work, then after a while some of the keys will
stop being detected. These are keys such as Caps Lock, Shift Lock, Return,
F0, F1, F3, F4 and F5.
> I have had a look at the keyboard diagram in the AUG and can confirm that
failing keys are all on columns 0, 1, 3, 4 and some others. 
> 
> I'm guessing that a contact is being lost somewhere due to the machine
heating up, but cannot find where this is.
> 
> Has anyone encounted this type of behavour before? What ICs control the
signals to/from the keyboard?
> 
> Thanks,
> 
> Mike.
> 
> -- 
> Michael Foot <mjfoot(at)paradise(dot)net(dot)nz> *
> http://homepages.paradise.net.nz/mjfoot/
> * Replace letters between () with @ and . when replying
> 
> 


_______________________________________________________________________
Freeserve AnyTime, only £13.99 per month with one month's FREE trial!
For more information visit http://www.freeserve.com/time/ or call free on
0800 970 8890