Question about HP 12c Calculator

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Keyboard HP 12c

I can not work with "Zero" symbol and "+" symbol. Do you know how to fix it?

I have been running the normal test to find something wrong, but every thing seems to be fine.

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Under the rubber membrane ,touching the individual symbols (in this case zero & plus[+] there is a carbon coating (black stuff) that shorts out the two metal connectors on the board, when u press down on the keys
Open hp12c and lift up membrane away from body and see if the metal contacts[on the body] are warned, damaged or that the " black stuff " is on the membrane.
u can try a fix...........take a small piece of aluminum foil and glue it to the underside of rubber membrane where the "stuff" was.
Don't put a thick piece because the metal foil should bounce back with the membrane as u press down on the key.
Hope that helps.
I tried this once.........a small dab[ hey!!,, when I say a dab....i mean a dab....of glue. Sharpen a pencil & rub the tip across a EMERY board so that the carbon "black stuff" from the pencil falls on top of the glue. Let it set & try for 2 hrs or more.
HOPE THAT HELPS!!!

Posted on May 14, 2008

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It could be some dirt or grit in the keyboard, which a blast or two of compressed air might clear out. It could be a worn dome on the inside of the keyboard.
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Do you have advice in calculator choice between HP 12 c and the TI BA II Plus Professional Financial Calculator? Assuming that I get proficient with RPN (which I'm learning now); is one faster than the...


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There are at least three different versions of the 12C available. There's the original 12C, the 12C Platinum, and the current 12C. The only way to tell the difference between the two non-Platinums is to look at the battery compartment---the original uses three button cells while the newer uses two coin cells. The newer one is MUCH faster. The Platinum, however, can use RPN or algebraic.

Unless your choice is limited to the 12C or the BAII (by the requirement of an exam, perhaps), you might want to look at the HP 20B and the HP 30B. Programmability aside, they're even more powerful and easier to use and faster than the 12C, and the 30B is also programmable.

There are other considerations, of course. Factors such as the feel of the keyboard, the 12C's landscape orientation as opposed to the others' portrait orientation, etc, are all matters of personal preference.

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Hello, You can try to perform the self-test. Procedure is as follows. To perform the self test on units with two batteries:
  1. Turn the calculator off.
  2. Press and hold the c01788482.jpg and c01774569.jpg keys; keep both keys held down for the next step.
  3. Press the c01788481.jpg key so the c01788483.jpg and c01788481.jpg keys are held down simultaneously.
  4. Release the c01788481.jpg key.
  5. Release the c01788482.jpg key, followed by the c01774569.jpg key. The main test screen displays the following: '1.L 2.C 3.H'.
    • Press c01788484.jpg to perform the LCD test (all LCD segments will be turned on). Press any key to exit.
    • Press c01788485.jpg to perform the checksum test and see the copyright messages. Press any key to go from one screen to the next until the main test screen, '1.L 2.C 3.H', is displayed again.
    • Press c01788486.jpg to perform the keyboard test. Press EVERY key on the keyboard until all the keys have been pressed at least once. The screen will progressively turn off with each key press. Once all the keys have been pressed and the screen is clear, press any key to return to the test screen.
Press c01788481.jpg to exit the test system. This will also turn the calculator off. If the calculator detects an error at any point, it will display an error message. For the HP 12c financial calculators with one battery, to perform the LCD self test:
  1. Turn the calculator off.
  2. Press and hold the c01788480.jpg key, and simultaneously press and hold the c01788481.jpg key.
  3. Release c01788481.jpg then c01788480.jpg .
  4. After a few moments, all elements of the screen should be displayed. Press any key to exit.
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I couldn't find any reference to a HP calculator model 12p.
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Check both models (for images, specifications, functions, user guides, etc.) :
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Hello,
Here is the self-test procedure for your calculator. If it does not answer as it should, it may need service. Sorry, I resized the picture but FixYa refuses the new dimensions. Hope it helps.

638017f.jpg

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gtabblt.gif Description gtabblt.gif Resetting the calculator using the keyboard gtabblt.gif Resetting to drain the capacitor gtabblt.gif Other solutions gtabseps.gif Description Sometimes a calculator will lock up or will not respond correctly. The calculator may require a reset for a variety of reasons. These resets will erase the memory on the calculator and restore the calculator’s defaults. For this reason, it is important to back up any critical data. Resetting the calculator using the keyboard The easiest reset is done from the keyboard. To reset the calculator, follow the procedures below in the order presented.
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