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1570-05 not working

None of the keys are responding, sometimes L-08 appears on the display

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Re: 1570-05 not working

One of your keys stuck inside try to push all keys with your hand many times bring a good brand contact cleaner from (radio shack) or another electronic store and spray above all the keys while you are pressing the keys many times.(use dry contact cleaner)

Posted on Mar 10, 2008

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It's stuck

If you fill all the entry line memory, the calculator stops responding. Clear entries to free memory.

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Press the DRG key then select the desired angular mode.

Be aware that whatever angular mode you set, the corresponding indicator will appear on the screen. There is no way to get none of them to appear (short of taking a razor blade to the display and cutting some traces, a procedure I would NOT recommend).

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Ti89 responds to resets but nothing else

If the calculator is several years old it may be showing its age.
There is a connection point between the keyboard and the display
that over time loses its efficiency. Try this: press a number key
and at the same time apply pressure with your thumb or index
finger to the region of the calculator just below the display.
If you press hard, the number may just show up in the display.
This is a test for the tightness (or electrical efficiency) of the
keyboard-to-display connections.
Another way to make this test is to twist the calculator while
you depress a number key.
Sometimes the effect is such that the keys on one side or the
other work, or don't work, and the keys in the middle don't work
or work okay. By twisting (don't break it!) the calculator body
while you press the keys will show the weakness of the
connector between the display and the keyboard.
This can be repaired by a good electronic technician if you
explain to him what I just told you.

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The calculator appears to be frozen; none of the buttons respond; the display only shows "Ans" with a little 2 above and to the right of it, making it look like Ans is squared and then a blinking cursor

If pressing CLEAR doesn't get rid of it, try resetting the calculator. Remove all four AAA batteries. Press and hold the ON key for ten seconds. Replace the batteries.

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How to fix a none responsive button in hp 35s calculator

Resetting the Calculator
If the calculator doesn't respond to keystrokes or if it is otherwise behaving unusually, attempt to reset it. Resetting the calculator halts the current calculation and cancels program entry, digit entry, a running program, a SOLVE calculation, an ∫ FN calculation, a VIEW display, or an INPUT display. Stored data usually remain intact.

To reset the calculator, hold down the C key and press GTO . If you are unable to reset the calculator, try installing fresh batteries. If the calculator cannot be reset, or if it still fails to operate properly, you should attempt to clear memory using the special procedure described in the next section. If the calculator still does not respond to keystrokes, use a thin, pointed object to press the RESET hole.
The calculator can reset itself if it is dropped or if power is interrupted.


If the calculator fails to respond to keystrokes, and you are unable to restore operation by resetting it or changing the batteries, try the following MEMORY CLEAR procedure. These keystrokes clear all of memory, reset the calculator, and restore all format and modes to their original, default settings (shown below):
  1. Press and hold down the C key.
  2. Press and hold down the R/S key
  3. Press i (You will be holding three keys simultaneously)
  4. When you release all three keys, the display shows MEMORY CLEAR if the operation is successful.

Mar 02, 2010 | HP 35s Scientific Calculator

1 Answer

Hp20s has locked up

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,
  • Remove the batteries, and
  • 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 You should contact them.

Hope it helps.
Thank you for rating the solution.

Nov 05, 2009 | HP 20s Calculator

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Does it say busy in the bottom right hand corner?

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Annoying delay

The same thing happened to me. I found somewhere that the no/slow key response could be due to a short in the I/O socket. I blew into it really hard, and it works perfectly now!!!!! I hope this helps.

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Will not respond at all@=!

I actually fixed mine!!!! The same thing happened to me. I found somewhere that the no/slow key response could be due to a short in the I/O socket. I blew into it really hard, (you may want to used compressed air, but I didn't have any onhand) and it works perfectly now!!!!!!! I hope this helps.

Jan 07, 2008 | Texas Instruments TI-84 Plus Calculator

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