Question about HP 12c Calculator

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Dropped my HP 12C into the sink (full of clean water)

I immediately (3 seconds) retrieved the calculator-dried it out the best I could- drops came out the front- took out the batteries and warmed the unit with a hair drier.

I have had this little guy for over 12 years and I hate to say good bye.

Any advice ? Bill

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Yes, take it apart, and wash the circuit board.
Hard part is taking it apart without breaking the little tabs that snap the case together. It may have a couple hidden screws somewhere like in the batt compartment or under a label or under the rubber feet. Then carefully pry the case joint apart to get the snaps to let loose. Then the circuit board easily comes out - be careful if all the keys are loose not to disturb them. Also be careful of the display that may be loosely mounted. Once you get the board out, you can wash it with soap and water - whatever, just rinse it when clean with something like alcohol so no residues are left. Also be careful to not rub off any off the black key contact spots where the keys touch it. Put it back together loosely and see if it works.
Hope Ya Fixit !!
Fame !

Posted on Jun 17, 2009

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What To Do if I Drop My Cell Phone in Water?


The small convenient size of cell phones unfortunately also makes these electronics accident-prone, especially when it comes to water. If you drop your cell phone in water it is often possible to salvage it. If you drop your cell phone in water, you may have only seconds to retrieve it, so you need to act fast even if it means retrieving it from the toilet!

The next thing to do if you drop your cell phone in water is to remove the battery immediately without even hesitating to turn off the power. Dry the batter with a towel and set aside to dry thoroughly. The battery itself may or may not work again, fortunately batteries can be replaced fairly inexpensively. Even if the battery does work, it is a good idea to get a new one.

After you have removed the battery, dry off the cell phone with an absorbent towel as best as you can. Use cotton swabs to soak up water in crevices and on any fragile, exposed circuits. It is also helpful to disassemble it if you can and let all the parts dry separately. Just be sure that you know how to put it back together. If it is a flip or sliding cell phone, leave it open.

If you drop your cell phone in a beverage or in salt water, rinse the phone off with fresh water once you have removed the battery. Once you drop the phone in water, the additional rinsing will not do further damage, however, minerals or other materials will.

If you drop your cell phone in liquid that isn’t pure water, you may want to try giving it an alcohol bath. The alcohol will displace minerals and microscopic substances as well as aiding in the evaporation of the fluid. If it is available, you should use an alcohol concentration of 95% rather than rubbing alcohol that usually contains only 70%.

Once your phone is clean, leave it in a warm dry area or near an air conditioner for three days before you attempt to replace the battery and turn it on. This is very important, because although you may think that you have thoroughly dried it, the slightest moisture can react with the battery and cause it to short circuit. If droped your cell phone in water, and want to save it, resist the temptation of turning it on to see if it is working until you have waited at least 72 hours.

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