HP 35s HP 35s scientific calculator - User Guide - Page 290
Testing Calculator Operation, Warning
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Warning Do not mutilate, puncture, or dispose of batteries in fire. The batteries can burst or explode, releasing hazardous chemicals. 5. Insert a new CR2032 lithium battery, making sure that the positive sign (+) is facing outward. 6. Remove and insert the other battery as in steps 4 through 5. Make sure that the positive sign (+) on each battery is facing outward. 7. Replace the battery compartment cover. 8. Press . Testing Calculator Operation Use the following guidelines to determine if the calculator is working properly. Test the calculator after every step to see if its operation has been restored. If your calculator requires service, refer to page A-8. The calculator won't turn on (steps 1-4) or doesn't respond when you press the keys (steps 1-3): 1. Reset the calculator. Hold down the key and press . It may be necessary to repeat these reset keystrokes several times. 2. Erase memory. Press and hold down , then press and hold down both and 6. Memory is cleared and the message is displayed when you release all three keys. A-4 Support, Batteries, and Service