How to Reset an HP 11C RPN Calculator

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The programmable scientific HP 11C RPN calculator features a random number generator and allows for individual input correction with a back-up key. The user operates the calculator by entering a value, pressing the "Enter" button, entering another value and then entering the mathematical operator. For example, entering the equation "2+2=4," the user would press the sequence "2", "Enter", "2" and then "+". Sometimes the screen and the buttons of the calculator become unresponsive, and you will have to reset the calculator to restore its functionality.

  • Allow the calculator screen to go blank by not pressing any buttons. This means that the calculator has turned off.

  • Depress the "On" key and then depress the minus, or "-," key. Release the "On" key first and then release the minus key. "Pr Error" should be displayed on the screen. The continuous memory, which is the stored memory, will have been reset.

  • Press the "y^x" key and the "On" key simultaneously on the calculator. This will reset the x-variable memory.

  • Depress the "On" key and then depress the "x" key. Release the "On" key first and then the "x" key. This will run a 25-second systems test that will reset the calculator. The screen should display the message "-8,8,8,8,8,8,8,8,8,8." Any other message means that the calculator needs repairing.

Tips & Warnings

  • Remove the batteries and wait 24 hours before reinserting them if none of the other methods are successful in resetting the calculator.

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