Osborne 1 keyboard repair?

Pete Turnbull pete at dunnington.plus.com
Mon Sep 21 07:18:40 CDT 2020

On 21/09/2020 12:41, Tom Hunter via cctalk wrote:
> The problem I am seeing is that 3 keys ("h", "j" and "y") are permanently
> pressed.

I'm not familiar with this keyboard, so despite having fixed lots of 
other types, what I'm about to write is no more than musing and may be 
inapplicable drivel, but...

A friend once spilled a glass of wine into his keyboard and had a 
similar problem.  I've seen the same from a cola spillage.  Washing it 
fixed it.  Can you see if there are any spillage residues in there?  IPA 
isn't always better than water and detergent - though you might want to 
use it as a water removal agent afterwards.

As I imagine you've already realised, the keys are adjacent and likely 
share a track.

I looked at the pictures.  Can you get at the other side of the circuit 
board?  If the it's fibreglass or even SRBP with copper tracks, maybe 
you can get at the tracks to the 'h' etc keys and cut them with a 
scalpel or craft knife to isolate them to see where the resistance 
really is.  Before cutting anything, obviously make sure you can get a 
soldering iron in there afterwards to bridge the cuts.

Pete Turnbull

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