|Unusual non-HP RPN (red led display) to restore...|
Message #1 Posted by Cristian Arezzini on 21 Oct 2011, 4:07 p.m.
A few days ago I impulse-bought a calculator on eBay. It is an "Emerson E12" calculator. There was no detailed description, but looking at the photos I noticed it was RPN so I bought it - at 14 Euro it was cheap enough.
It arrived today, and it works when I power it with the included adapter. It's pure RPN, quite nice and feature-rich, made in 1975. I opened it, and it's quite clean inside, but I noticed that it's actually a re-badged Corvus 500! And I'm quite happy about that! :)
But it has a problem with the display: three segments are totally missing, and two more have a few "dots" missing. The display is made by hp (there's 1130-053 written on it). Is there something I can do to fix it? If not, is there somewhere to buy another - or a compatible replacement?
Second problem: there was some oxidation on the metal contacts for the batteries. I cleaned them the usual way, but one broke. What material should I use to rebuild it? Copper foil? Something else?
Third question (but this is unrelated): another calculator I'm restoring has (had) a foam pad between the keys and the domes. The foam has disintegrated with age. What can I use to replace it?
Fourth: right now I'm in the process of trying to restore several calculators... is it OK if I ask a lot of questions here? :)