Question about HP 32sII Calculator

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The right hand column of buttons (+,-, etc) doesn't work at all!

I carefully opened my HP 32S but this has not be useful for fixing it: there isn't serviceable parts inside, only a big IC and a lo of thin wires that start from IC's leads.
I could have opened the keyboard assembly too, but I think that the problem is more serious and it depends from the CPU.

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  • app_3rp12813
    app_3rp12813 Mar 12, 2012

    Please see HP archive post:http://www.hpmuseum.org/cgi-sys/cgiwrap/... Or search for: "hp 32s repair - dead right column of keys". This solution works if pinching the case on the right side below the screen fixes the issue.

    Before trying this fix though, I successfully fixed my 32S by putting crazy glue (Loctite 495) on the crack on the right side just below the screen near the 1/x key - and of course pinching it together until the glue dried.

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SOURCE: keyboard not working due to a spillage over keys

Very possibly, yes. Usually the internal parts of RF keyboards are heavily customized and a shop would need to keep tons of parts for every different keyboard under the sun.

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Depending on the spillage, sometimes you can repair the keyboard. RF keyboards are much more difficult to fix because the spillage may have shorted circuits or oxidised contacts and tracks.

But if you've nothing to lose, and especially if some keys are working (indicating that the transmitter electronics, the most delicate part, is still alive), then you can take apart the keyboard (screws underneath, and retainer clips too). Under the shell there are other screws holding the typing surface. Removing them, the back of the surface comes off, revealing a contact membrane and a wealth of printed curlicues.

Wipe the curlicues with a lint-free cloth and alcohol to remove coffee and sugary liquids. Inspect carefully for oxidation and rust; sometimes you can remove it with a pencil rubber. Spray with a contact enhancer spray such as DeoxIT.

The membrane is the tricky part: usually lukewarm water or alcohol will do, but it depends on the formulation of the contact pads (usually black round thingies). Sometimes you can see which pads have been affected by the spillage and clean them with a cotton swab.

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