Needing more advice with my HP-48S - Printable Version +- HP Forums (https://archived.hpcalc.org/museumforum) +-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html) +--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html) +--- Thread: Needing more advice with my HP-48S (/thread-196303.html) |
Needing more advice with my HP-48S - Palmer O. Hanson, Jr. - 09-18-2011 On 14 May I reported: Quote: I now find that I have a new problem with my HP48S. If I press either the 2 or the 3 key the number 23 appears in the screen. Similar effects occur with the 5 and 6 keys, the 8 and 9 keys, and the . and SPC keys. Similar effects also occur with pairs of keys which are not part of the numeric keyboard. For example, if I enter 9 at level 2 and 2 at level 1 and press y^x I would expect to see 81, Instead I see 22.36159094 which indicates that the calculator took the square root of two and then raised 9 to the square root of two power. Similar effects appear with other adjacent pairs of keys such as EEX and DEL, etc. If I place the calculator under a reading lamp for a couple of hours it will operate properly for a few minutes and then will return to the operation described above. I think this means that some of the cell leakage may have gone into the electronics compartment, perhaps under the keyboard. This is certainly possible since the cell compartment is not a bathtub as was the case with the HP-35, HP-45 and HP-80. So, my questions are: How do I open the the device to inspect for cell leakage and to clean if necessary? Or, am I better off simply keeping the calculator warm?
Re: Needing more advice with my HP-48S - aj04062 - 09-18-2011 You can search the internet for methods to open this or the 48G series. I have found good luck using the method
However, fixing corrosion in the keyboard is a whole other thing. It requires a lot of work to take the keyboard assy apart. Edited: 18 Sept 2011, 11:03 p.m.
Re: Needing more advice with my HP-48S - Martin Pinckney - 09-18-2011 Quote:Palmer, here is some information I downloaded a couple of years ago. But be advised I have not tried it myself, so you are better off listening to someone who has! Re: Needing more advice with my HP-48S - Bart (UK) - 09-19-2011 Hi Palmer, |