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Re: Spotty screen and upside down numbers
I know how to "fix" the one with battery acid on it.
Simply get a small wire brush and clean the +/- ports (the ones that have the acid on them.) (I use the term "simply" very loosely.) I suggest that you do this over a sink or a plastic bag, and don't let any of that acid get on you, it is very dangerous (it is corrosive, but the corrosion won't affect plastic.) The one with the malfunctions; while holding the [CLEAR] button, take out ALL of the batteries and put the same ones in (if they are good.) and relese the clear button and turn on the calculator.
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The calculator may have been subjected to a hacking procedure from the Internet. Try to find an antidote (on the Internet) or buy another calculator. You can also enter your calculation without looking at the screen, and when a result is found turn the calculator upside down to read the result.
The 48GX runs on three AAA type alkaline batteries. However, if the device was unused that long, the button cells used for backing up the RAM cards may also be depleted, and the calculator will report "low battery" displaying the ((.)) symbol, even with fresh AAA cells installed.
The RAM card mounted batteries are type CR2016.
Remove the calculator battery compartment door by pressing down and sliding it off away from the calculator.
Turn the calculator and shake the batteries out.
Replace with a fresh set of AAA alkaline batteries. Polarity is marked on the bottom of the battery compartment.
Replace the battery compartment door by sliding it back in place.
RAM card batteries:
Turn the calculator over and remove the plastic cover over the plug-in card ports (display-end of the calculator).
HP recommends to turn on the calculator while replacing the RAM card battery to avoid memory loss. I assume, your HP48GX has no marbles to recover by now anyway, so it does not matter, I guess.
Near the left side of the end of the card. you'll find the nail grip in the black plastic battery holder. Use a thumbnail to gently pull out the battery holder. There is one battery in each card (additional cards are options).
Remove the old battery from the holder and replace by a new CR2016 button cell. The "+" side of the battery should point into direction of the calculator's front.
Re-insert the holder with the new battery and check the RAM card is properly seated still.
Close the compartment by sliding back in the cover.
Hello, Press [CLEAR] to erase the screen. If that does not work reset the RAM Press [2nd][MEM][7:Reset][1:All Ram][2:Reset][ENTER]. Then press [CLEAR]. If these steps fail, you should read the article. Hope it helps.
I have read that to invert the LCD-screen you just flip the polarisation-plate (the plastic film that sits over the LCD display) 180º, that is, upside down.
Did you or someone opened your calculator? He might have reassembled it wrong. Or was it a prank?
If that was not the case, your best change is to reset the calculator and see if it solves your problem.
To manually reset your graphing calculator:
Remove all AAA batteries.
Remove the back up lithium battery.
Leave the unit empty for 5 to 10 minutes.
After the 5 to 10 minutes, place all the batteries back into the graphing calculator.
This process should restore the graphing calculator to the factory settings.
Hello, Press the reset button on the back of the unit. As to the things you want to get rid off, if they are on the top of the screen, they are indicators, to let you see what mode you are using. Some will change when you chande operation mode. There is nothing you can do about it. However if these symbols are in the center of screen , with numbers to there left (a different number for each) they may be part of the setup procedure. During the setup procedure you are expected to configure your calculator in the mode relevant to the calculations you intend to perform. What is an upside down p ? Could it be just a b? (as in binary). That is a mode of operation. Hope it helps.