I used to fix TV's and with that came many faulty remotes. I dismantled
them, washed the membrane, buttons and case with Fairy or similar and
cleaned the carbon pads and PCB with Servisol switch cleaner and/or
isopropyl. Broken PCB tracks could with care be fixed, often with
conductive paint, and breakages around the legs of crystals & IR LED's were
common and easily fixed or replaced.

Kenny

"John Heath" wrote in message
...

On Sunday, December 27, 2015 at 4:31:28 PM UTC-5, N_Cook wrote:
On 27/12/2015 16:04, Cursitor Doom wrote:
Hi all,

I have an elderly Casio scientific calculator (fx-3400p) which I've
owned
since new in 1991 (so I'm quite attached to it). Lately, the numeral '2'
key has become a bit flaky inasmuch as every press doesn't always
register 100% of the time any more. I know these things are dirt cheap
to
replace, but I've got used to the layout of it and don't really want to
upgrade to something new if it can be fixed reasonably easily.
Any ideas what the problem might be?
thanks.


If its like my trusty solar powered fx451 from 1980s, used 20 times
today. To get
inside you pull the rear surround away from the case body proper, by
pushing your fingers through mock leather covering on the long edge
farthest fromthe hinge section. That edging traps the mock leather in
the gap between the 2 case parts

This reminds me. Take a cell phone picture of the front of the calculator
first before disassembling. All the buttons will fall out making it a
challenge to put them all back where they belong without a picture for a
guild. Been there done that and I paid the price for not taking a picture
before hand.


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