Just found in the mailbox

[Marcio]

(11-13-2015 07:21 AM)ElectroDuende Wrote:  Hello Marcio,

I'm afraid that your problem was not caused by the alcohol you used; it was present before. If you look at the picture you posted, around the "SOLVE" lavel, you can see that the paint is not flat; it has "blistered", and is already detached from the base plate. Anything you use to clean it (even a dry cloth, if you press enough) will break the paint and remove it.

It is the first time I see this on a Voyager series, but it is quite common on pioneers; I have an HP22S with the very same problem. For the moment I don't know a way to fix it; maybe a protective lacker coat... but it may help to dissolve the already weakened paint. If it was completely ruined, i would try to use a vinyl sticker, like the one used on WP34S, but it is not something easy to create...

Regarding on what caused this problem, it is difficult to say, but maybe an extended exposure to UV ligth (sun), high temperatures, moisture, certain chemical agents... is the back label also affected? If so, I think we could discard sun...

Hello ElectroDuende,

The unit had many signs of wear. It was actually all over the machine. The bezel and the back were remade, kinda replaced with aluminum plate/coating. Whoever did it, was a professional no doubt. The keyboard plate however was noticeably old and certainly had been exposed to chemicals before, or the sun. The idea was to pay for a full repair and then find someone who could redo the back, maybe my making a sticker and gluing it there permanently. But then I figured that would not be so easy and decided to purchased another one from the same seller instead. Luckily, he had one that is near perfect, to the point I am using more and more the 15c app on my phone than the calculator itself just to keep it like that. I would consider a 12c as a backup if it had a few more scientific functions like solve or trigs (although there are programs for the 12c published in the old forums that will find roots of polynomials and calculate trigs will full accuracy but they are sadly not enough for me).

Marcio