Date   : Thu, 20 Apr 2006 08:42:52 +0100
From   : Mike Tomlinson <mike@...>
Subject: Re: Keyboard

In article <002501c658cd$c87b6db0$3201a8c0@...>, David Hunt
<dm.hunt@...> writes

>They do seem to give up at an alarming rate. I just find they've got a thin
>layer of grease on them or they're slightly corroded when I strip them
>apart. 

There's no need to strip them.  A squirt of isopropanol (from a can with
a tube) between the plunger and the keyswitch body, followed by rapid
tapping of the key, usually works.

When working for an Acorn dealer, we had in for repair over the years
many hundreds of Masters with dead keys.  I realised that the majority
of those came from an area with a lot of heavy industry (= air
pollution), which suggests the switch contacts were corroding.  Wonder
what it did to the children's lungs?

The Mark II keyboard (made by Cherry) with the membrane was very nice.

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