I have an HP21 that has had somebody install alkaline AA cells in the battery pack.
Nothing happens when I turn it on.
Q1: Will the HP21 be damaged by alkaline cells being used in place of the original nicads?
Q2: Looking at the back of the calculator with the charging port to the top and the battery terminals to the bottom, the terminals are marked - (left) and + (right). Is this correct?
Q3: Are the screws under the rubber feet like nany other models?
Q4: Assuming there is nothing obvious wrong if I need to open the calculator, what are common problems.
Some preliminary fault finding that shows a change in resistance across the battery terminals when the calculator is turned on tends to suggest it's not the switch :-(