Playing with HP2640B
hp-fix at xs4all.nl
Fri Nov 17 06:12:29 CST 2017
I did it by heating the crt to about 50-60 degrees celsius and used a putty-knife.
The photos are from a Philips P2000M system but I did it the same way with my 264X terminals and 9845's systems.
It takes about half an hour to heat and separate the screen from the crt .
> The screen on my HP2640 had degenerated quite far. It was only a spot in the
> middle, 2 by 4 inch, that still attached the glass to the CRT. I used a thin fish fillet
> knife to dig through the remaining glue.
> The result after:
> Anyhow, I researched the glue a bit. The glue is, as far as I understand, PVAc
> (PolyVinylAcetate, sometimes also known as PVA). PVAc is not soluble in water.
> It takes quite high temperature to melt it. However PVAc is soluble in many
> esters. I bought some Butylacetate. It dissolves sample bits of glue from HP2640
> quite well and rapidly. Butylacetate has quite high boiling temperature (about
> 120 degrees centigrade) and thus does not evaporate that quickly. So my idea is
> now to test on a 2645 screen or VR201 screen by adding some butylacetate and
> seal with some thin plastic wrap foil and let it dissolve a bit. Then use the fish
> fillet knife again and repeat the process.
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