The Sharp EL-509LH is an arithmetic calculator with algebraic logic. It has an LCD (liquid crystal) display.
Facts at a glance:
Note that diagnostic tests generally delete any data on the calculator. Be sure to back up any important information held in the calculator before running these tests.
Switch calculator off, then hold 2ndF and M+ key and press reset button on calculator back.
If you have a Sharp EL-509LH that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements: