Question about HP 12c Calculator

Open it up by removing small screws on the back. Then, gently pry it open. Once you open it, carefully take the rubber pad off the pushbuttons. Then, gently blow things off and wipe it down with denatured alcohol, on a Q tip.

Posted on Sep 09, 2009

Its not a hard procedure to disassemble the device you should check for the internal touch pad board made up of rubber and plastic,check the touch pad area beside the number 6.if any dust of rust collected clean it.then slightly lift the touch pad of rubber and under that there will be main circuit board.check that also in the place of number 6.if the circuit is short or got dust clean it with isoprophyll and tissue paper.you can get isoprophyll at local medical store.do not apply water to clean the parts. --------- For disassembling----- Tool Description 1)Art knife 803(or any thin strong knife) 2)Screwdriver.(102*150mm).------ Product Disassembly Process 1)Take out 4pcs RUBBER FOOT by hand. 2)Open battery door and take out batteries 3)Use screwdriver to loosen 5pcs screws. 4)To disassemble L/C along unit lower side. 5)Take out 2pcs grounding springs 6)Use art knife to cut off PCB boss. 7)Take out PCB.(PCB means the internal board) ----------- this will help. thanks.please keep updated.please do rate the solution if helped.thank you for using fixya.

Posted on Sep 09, 2009

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Posted on Jan 02, 2017

There is an excellent computer-based tutorial for the HP 12c Platinum on HP's website (although the sequence for TVM calculations is the same for the original 12c).

Download it and have a look. It will guide you key-by-key through the steps.

http://h20331.www2.hp.com/Hpsub/downloads/cbt_12c_platinum.zip

Download it and have a look. It will guide you key-by-key through the steps.

http://h20331.www2.hp.com/Hpsub/downloads/cbt_12c_platinum.zip

May 08, 2014 | HP 12c Calculator

I take it you mean a 12C Platinum.

Press f ALG. ALG is the f-shifted function of the EEX key, just above the double-size ENTER key. This will switch the 12C Platinum from RPN mode to Algebraic mode, and ALG indicator will light up instead of the RPN indicator.

To switch back to RPN, press f RPN. RPN is the f-shifted function of the CHS key just above the EEX key.

Press f ALG. ALG is the f-shifted function of the EEX key, just above the double-size ENTER key. This will switch the 12C Platinum from RPN mode to Algebraic mode, and ALG indicator will light up instead of the RPN indicator.

To switch back to RPN, press f RPN. RPN is the f-shifted function of the CHS key just above the EEX key.

Apr 23, 2014 | HP 12c Calculator

1. Make sure the HP-12C is in compounding mode. Press STO-EEX repeatedly until a tiny "C" appears in lower right of display.

2. Make sure "BEGIN" is NOT shown in the display. If it is, press g-END.

3. Clear financial registers: f-FIN. (That is really the "f" key then kind of the "Clear FIN" key -- I'm sure you'll see it.)

4. Enter zero as "initial investment". CLx, then g-CF0. (You have to do this because the 12C actually computes the "NPV" as an excess or deficit over the entered "initial investment". By entering zero, you force the calculator to just give you the actual net present value.)

5. Your first cash flow is +2.00. So, enter 2.00, then press g-CFj.

6. Next cash flow: +2.10. Enter 2.1, then press g-CFj.

7. Last cash flow: +22.20 (the final value of the stock plus the last dividend payment). Enter 22.20, then press g-CFj.

8. Enter the 10% interest (a.k.a. discount) rate. Enter 10, then press "i".

9. Compute the NPV. Press g-NPV. The answer is indeed 20.23 (at least to two decimal places).

2. Make sure "BEGIN" is NOT shown in the display. If it is, press g-END.

3. Clear financial registers: f-FIN. (That is really the "f" key then kind of the "Clear FIN" key -- I'm sure you'll see it.)

4. Enter zero as "initial investment". CLx, then g-CF0. (You have to do this because the 12C actually computes the "NPV" as an excess or deficit over the entered "initial investment". By entering zero, you force the calculator to just give you the actual net present value.)

5. Your first cash flow is +2.00. So, enter 2.00, then press g-CFj.

6. Next cash flow: +2.10. Enter 2.1, then press g-CFj.

7. Last cash flow: +22.20 (the final value of the stock plus the last dividend payment). Enter 22.20, then press g-CFj.

8. Enter the 10% interest (a.k.a. discount) rate. Enter 10, then press "i".

9. Compute the NPV. Press g-NPV. The answer is indeed 20.23 (at least to two decimal places).

Apr 08, 2014 | HP 12C Platinum Basic Calculator

Press 6 . 0 0 5 g square-root

square-root is the g-shifted function of the leftmost key on the second row.

square-root is the g-shifted function of the leftmost key on the second row.

Jul 10, 2013 | HP 12c Calculator

If you have the 12C Platinum, turn the calculator on. Press and hold the f key, then press the + key to increase the contrast.

Mar 09, 2013 | Office Equipment & Supplies

On a 12C Platinum, press f [ALG]

On a non-Platinum you're stuck. It has only the RPN mode.

On a non-Platinum you're stuck. It has only the RPN mode.

Jan 15, 2013 | HP 12c Calculator

Assuming you have a 12C Platinum, press f [RPN] to switch from the algebraic to the RPN mode. [RPN] is the shifted function of the CHS key on the top row of the keyboard.

Jun 21, 2011 | HP 12c Calculator

I presume you're on a Platinum since the non-Platinum 12Cs don't have an algebraic mode.

To switch back to RPN, press f [RPN]. That's the yellow "f" key followed by the "CHS" key.

To switch back to RPN, press f [RPN]. That's the yellow "f" key followed by the "CHS" key.

May 18, 2011 | HP 12c Calculator

There isn't one. You can square a number in two keystrokes by multiplying it by itself (press ENTER then *) or, if stack lift is enabled, by raising it to the second power (press 2 then y^x).

Since it only takes two keystrokes, there was no point in making a shifted key sequence to do it, and keyboard real estate was too limited to devote a key to the function.

Since it only takes two keystrokes, there was no point in making a shifted key sequence to do it, and keyboard real estate was too limited to devote a key to the function.

Feb 25, 2011 | HP 12c Calculator

Are we dealing with a 12C Platinum instead of a 12C?

On a 12C Platinum in ALG mode, you don't use the ENTER key at all, but the = key.

On a 12C Platinum in ALG mode, you don't use the ENTER key at all, but the = key.

Feb 08, 2010 | HP 12c Calculator

Feb 26, 2015 | HP 12c Calculator

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I could use more help on topics 4,5, & 6. Can't identify parts. Where is PCB boss? Thanks

Don't know if you got my last message. Can't identify grounding springs & PCB boss. Please advise. thanks, Peggy

I cannot detach the board from the front of the calculator was told to cut boss, but cannot locate.

Having trouble separating the "guts" from the front shell. Shell is open, no problem, but can't find the hidden attachmen. Afraid to pry too much at this point might break board. Thanks

No screws found. Very solidly attached to front.

OK, got the baby going. (whew!!) The trick is this: (maybe I should work for you guys:)) There are two rows of small (plastic) rivets which attach the board to the front of the unit. Took a pocket knife and reamed those all flush, then the board could be released. Cleaned behind the contact where the "6" is, repositioned carefully then reassembled. Self test went fine. The only boo-boo I made was to lose the tiny grounding springs. Hope they weren't necessary :)

Yes, thanks guys. Need to warn about the plastic rivets attaching the board to the front shell, but nobody should have to do surgery yet on an HP Platinum, anyway. The old HP-12C guys last 25 years!

Thanks for a pleasingly geeky experience. :)

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