I just got one of these of eBay. The battery was dead and the owner did not claim that it worked. I immediately tried a rebuilt battery I have and it did not work. However, when plugged in with the wall charger, it does.
I presume the two outside contacts on the charger plug socket must make contact when running on batteries. This contact is a little corroded. Is it safe to jump these to determine for sure that this bad connection isnt the fault?
I do not think I want to break into this calculator to look at the contacts beneath the battery tray as the label is in pretty good shape.
Thoughts on easy fixes?