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How to reset hp20s - HP 20s Calculator

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Resetting the calculator using the keyboard To halt the calculator and reset the keyboard, follow the procedure below:

  1. Press and hold the [C] key.
  2. Press and hold the third key from the left on the top row.
  3. Release both keys at the same time.
  4. The calculator will now display "0.00" (if the number of decimal places is set to two.)
To completely reset the calculator and erase all user memory, follow the procedure below:
  1. Press and hold the [C] key.
  2. Press and hold the first key from the left (the N key) and the first key from the right (the sigma +) on the top row. Release all three keys at the same time.
  3. You should see "ALL CLr" on the display.
  4. Pressing the [C] key will clear the message.
  5. The calculator will display "0.00."

Posted on Dec 20, 2010

  • mariacris728 May 02, 2011

    is still impossible to turn it off. Do not accept the normal comand . We use the both procedures above but no refresh still apperas 0.0000
    : and the picture of a battery
    We already change the batteries and problem still continua.
    Please help us . Our e-mail is mariacristina.sanchez@cytec.com Thanks

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Hp20s has locked up


Hi,
If the calculator has locked up you should perform a reset.
  1. Press and hold the [C] (ON/OFF) key
  2. Press and hold the [LN] key (third key from the left on the top row).
  3. Release both keys simultaneously. T
  4. The calculator should display "0.00" (if the number of decimal places is set to two.)
If that does not bring it to life you should perform a full memory reset

  1. Press and hold the [C] (ON/OFF) key.
  2. Press and hold the first key from the left ( the Square root x key) and the first key from the right (the SIGMA+ key ) on the top row.
  3. Release all three keys at the same time.
  4. Calculator should display "ALL CLr".
  5. To clear the message press the [C] (ON/OFF).
  6. The calculator should display "0.00."
If the calculator does not respond as expected,
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  • with a metallic coin (and what coin is not metallica) short-circuit the calculator's electrical terminals.
  • Maintain the coin for about ten seconds.
  • Replace the batteries (preferably fresh ones) respecting the diagram inside battery compartment.
  • The Calculator should display "ALL CLr".
  • To clear the message press the [C] (ON/OFF).
  • The calculator should display "0.00."
If the calculator does not respond to the foregoing procedures, remove the batteries and leave them out of the calculator for 24 to 48 hours to drain capacitors.

If it continues to malfunction, it will need to be repaired. One repair shop in Pennsylvania, USA has a website at http://www.fixthatcalc.com. You should contact them.


Hope it helps.
Thank you for rating the solution.


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