|Re: HP80 doesn't work without battery charger|
Message #19 Posted by aurelio on 2 Nov 2011, 10:11 a.m.,
in response to message #18 by Tony Duell
Hello Tony, thank for your interest! I checked the continuity at first with the digital multimeter (buzzer) and even if I test it now, I get sound, but actually, when I test it with the analogic ohmeter, the result is quite different: the continuty is not "continuous" (excuse me the words) between the spring on the negative pin (the central one). I think that the problem should be not due to the wire but to the corrosion on the surface of the spring; infact if I test it between the pin and the lower part of the spring (the one which goes into the chassy) there are no problems, but if I move the probe along the upper surface of the spring, the resistance change and somewhere there is no contact!. At the end (the top) of the spring, the contact is good, but I don't know what happens when I pus the battery into my calculator and lies in the compartment..I mean if the contact between the pack and the spring is good or not. I can imagine that at least the upper part should get in contact, but in that case, the calculator should be powered, what do you think about? I've tried at the beginnig to apply a drop of soldering wire, on the corroded spring, but I was not able to pristine the surface (the corrosion doesn't allow the the soldering wire to attach-on). Maybe it need to be cleaned or prepared somehow. I confess to have not geat experience in soldering.........
EDIT: just edit now, I placed a piece of metal on the spring, then I drop the battery pack, I got this way a better contact and the calculator works!! It means that the problem is on the spring, I must get a better contact, what can I do?
Edited: 2 Nov 2011, 11:33 a.m.