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isanchez · (This post was last modified: 05-20-2014 07:09 AM by isanchez.)

Dear friends,

I have an HP25 with an strange behaviour. I pass to describe it:

-Apparently turns on correctly, showing 0.00

-You can key numbers these are shown in the display, BUT when you try to press "ENTER" or make any kind of one key calculation, it shows 0.000000000

-This happens also when decimal point, exp, or chg sign is depressed...

- The SCI & FIX, functions work well.

-If you set it into PRGM mode you can enter any kind of programme. All the keys respond correctly, but you cannot run the programme. It shows 0.000000000 after trying to run it.

-Internally looks like new, no corrosion, nothing dirty or bad contacts.

By the way, it has a rare keyboard (at least I have never seen any like this one) the back side is all black, not white as usual. The S/n is 1706s23130

I would appreciatte very much your help to try to repair it.

Many thanks in advance.

Kind regards
Ignacio