20 Most Recent Casio DF-120TE Calculator - Page 8 Questions & Answers

Casio has most of their calculator and adding machine manuals available here: http://support.casio.com/en/manual/manuallist.php?cid=004 . Select Printing Calculators in the first drop-down menu. Then select the HR-100TM/HR-150TM in the second drop-down menu. Press the Search button. This should get you to the product support page: http://support.casio.com/en/manual/manualfile.php?cid=004016014 . The direct link to the user manual is currently http://support.casio.com/en/manual/004/HR-100TM_HR-150TM_WC_EN.pdf . I hope this helps. Cindy Wells

You can't do that on Casio fx-991es plus calculator. Usually, infinity symbol available in calculators with CAS (Computer Algebra System).

hi meredyth. try this link out. manual for Casio HR 100TM Google Search

Found the manual but nothing about the sound. If I recall sometimes the part that makes the sound can be damaged when replacing the battery, open it up and check the (little wire type vibrating bar) sound bar and adjust if necessary. http://www.casiodigitalwatches.com/manuals/0809.pdf

Just a guess on this but I would say Page/Number ...Good Luck

If unit has been lobotomized, forget it.

The battery that came out of it will have a number/voltage on it... just replace it with same.. If this isn't possible, take the watch to Batteries.bulbs, etc,, they can fit it with one.