Looking for instruction book for BA-35 solar - Texas Instruments TI-36X Scientific Calculator

http://www.soa.org/files/pdf/FM-22-05.pdf

The one marked "I/Y" (third row from the top, second column from the right) for "Interest per year".

It does not have any batteries, it's purely solar-powered. Cost for a repair most probably would exceed the value of the device, sorry,

The BA-35 takes two A-76 batteries.

The BA-35 Solar doesn't take batteries, being powered exclusively by the photocell.

http://www.soa.org/files/pdf/FM-22-05.pdf
Or
http://www.actuarialoutpost.com/downloads/ba35qr.pdf

Let me know if you need anything else.
Benjamin

Glad to be of help.

Please go to this site and order the book
http://www.camerabooks.com/Departments/Rollei/Rollei-35-Books-(New).aspx

You will have to take it apart, under where the buttons are there will be some meandering gold or carbon tracks, clean this area with IPA or something similar, you can use nail varnish remover, then clean the back of the button with water, NOT a solvent as its probably rubber and will potentially either melt, I would do all the buttons at the same time since they will probably all start going if that one has. Re-assemble and it should be ok!

there should be a reset button, try using that unless it's a model i'm not familiar with... they usually all have the same reset options.. if this doesn't work, try finding the manual because that should advise you of how to reset.. don't forget to check the batteries.. good luck and let me know if i can be of any assistance..

thanks,
d