To get started, enter the following with upper/lower case exactly as shown below. You can enter those equations into your TI calculator. See also examples involving equilibrium and Boltzmann distributionĪnother web page you might be interested in is Make sure you read the section corresponding to your calculator. Note, the TI-89 makes no distinction between upper and lower case. TI-85 or TI-86 prior to each letter, then the key for that letter With the TI-89, these will be lowercase.Į q n (lowercase letters) press on the TI-89 or on the IDEAL (uppercase letters) press prior to each letter, There is a similar chapter for the TI-89. If you have a TI-85 or TI-86, you might want to check out the complete chapter If so, then reinstall the screws and your back to a working calulator.Using Your TI-85, TI-86, or TI-89 Equation Solver Using Your TI-85, Best to put the batteries back in place and see if it will power on. A flashlight and magnifying glass is helpful. When you put the covers back together, you will be able to see thru the two square holes by the inner 2 batteries if the springs are making contact with a different location on the pad. Turn over the the battery cover and with a pair of needle nose plyers, bend the two outer spring fingers inward a bit. It will look like a white or green powder. At this point, look at the pads to be sure there is no corrosion on them. You will probably see a black dot but if you look under a magnifying glass, you will see the bare circuit board.

When you get the cover removed, look at the pads. There is one at the top center and one on each size approximately centered along the length of the battery. Work along the edge and unsnap the 3 snap joints. Get a small flat blade screwdriver and pry along the edge of the upper and lower covers (not the loose cover). Then remove the screw covering the flat backup battery - just above the batteries. To reach the contact pads, you simply remove the 6 screws along the outer part of the cover. In my calculator, the spring wore thru the contact pad. The board flexes slightly when buttons are pushed and this causes there to be wear between the spring and board contact pad. If the above doesn't work, then you need to look at the contact springs from the batteries to the main board.

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