Question about Texas Instruments TI-85 Calculator

4 Answers

Dark screen? I borrowed this calculator from a friend and i switched over the lithium battery and the regular batteries to another ti85 that i wanted to see if it worked, so i switched the batteries back to the ti85 that i borrowed and i turned it on and its just a black square, but i can still see the cursor. please help.

Posted by lionhead29 on

  • kiquali Dec 18, 2008

    I had the same problem and tried the tricks above and it didn't work for me either.

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4 Answers

Anonymous

Press 2nd and let go then press the down arrow once.
again,
press 2nd and let go then press the down arrow once.
and so on and so forth.

Posted on Aug 05, 2008

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Anonymous

Mine didn't work at first either (with panasonic batteries) then I tried duracel and it was fine

Posted on Aug 01, 2008

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Anonymous

This doesnt work for mine

Posted on May 30, 2008

Anonymous

Press 2nd, hold the down key until the screen lightens up.

Posted on May 07, 2008

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1 Answer

Wont turn on


Good morning, afternoon, evening or night; whatever time of day you are viewing this solution post. Thank you for choosing FixYa to assist you. You are having problems because you calculator won't turn on. I think you should try changing the batteries. Did you know that your calculator has two batteries powering it? Not only are the 4 AAA batteries powering it, but there is also a CR 3V Lithium Back Up battery powering it as well. First, try changing the 4 AAA batteries. If that still does not power your calculator properly, you will need to replace the lithium back up battery. You can find this at a department store or store that carries electronics. To do this, open your regular battery compartment. Above the AAA batteries is a compartment that says "BACK UP BATTERY CR1616 OR CR1620" with a picture of it. Use a small crosshead screwdriver to open the compartment. Take the old battery out and replace it with the new one. Rescrew the lithium battery compartment back on and close the AAA battery compartment. Turn on your calculator and see if that works. I hope this solution solves this.

Sep 27, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

TI 82 Does it need the disk battery and 4 AAA batteries to work?


No. The calculator runs on the four AAA batteries. The lithium battery is solely to retain the contents of the memory while you change the AAA batteries. If you don't care about retaining the memory, you don't need the lithium battery. You do, however, need the AAA batteries to use the calculator.

Jul 31, 2011 | Texas Instruments TI-82 Calculator

1 Answer

Ti 85 wont turn on, batts good, tried to adj contrast , still nothing


Are you sure the batteries are in correctly? They alternate negative/positive, positive/ negative and so on. The first time I put the batteries in, I didn't have them in correctly. You tried adjusting the contrast. Just try adjusting upwards. Sometimes it takes a little for The Ti 85 to come on or adjust right. The Ti85 is an old calculator and, may not work any more. I had my Ti89 for almost 20 years so, they are pretty reliable. If nothing has worked take out all the batteries including the small one in the back. Texas Instruments say's " leave them out for 5 to 10 minutes." I had to leave mine out for over a 1/2 day to get it to work.

Here is the battery reset procedure for the Ti 85.

Try a new set of AAA batteries.
  1. Adjust the contrast by pressing and releasing the [2nd] key followed by pressing and releasing
    the up arrow; repeat as necessary. To adjust or lighten the display, use the down arrow.
  2. Remove one of the AAA batteries. Press and hold the [ON] key for 20 seconds. Reinsert the
    AAA battery and then turn the calculator on.
  3. Remove all of the batteries including the round lithium battery for 5 minutes. After the 5 minute

  4. period, reinsert all of the batteries and turn the calculator on. Adjust the contrast if necessary.

Just keep trying. Sometimes they can be a pain.

Dec 28, 2010 | Texas Instruments TI-85 Calculator

1 Answer

Hmmmm...I'm pretty sure most TI users know about the dimming function of the calculator. So, Mr, Guru, why is my TI85 is not turning on even though I've installed brand new batteries in it (Both the AAA's...


Hi
In the TI85 this problem could be if you did not use the calculator for a long time. in this case the calculator need hardware reset.
if it will not help its an Hardware Failure
if you want to fix the Calculator let me know
[email protected]

Jack

Oct 22, 2010 | Texas Instruments TI-85 Calculator

1 Answer

I put new lithium triple aaa batteries in my TI-83. Nothing happened . days later it turned on worked for a little while then stopped. would it help to change the round lithium battery? Do you know what...


The button cell backup battery keeps the memory electrically refreshed when the calculator is turned OFF. The necessary power for regular use is supplied by the 4 AAA batteries (main power). That nothing happened when you put in a fresh set of (expensive) lithium batteries may be due to the screen being too dim to see anything.

If the calculator displays RAM CLEARED each time it is turned on, it may be due to a depleted backup battery. The battery model number is CR1616 or CR1620. On my TI84PLUS the backup battery is of type 303 (Sony) or SR44SW (Maxell).

Sep 05, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

Do you need the lithium battery for the calculator to work


Not absolutely. The calculator is normally powered by the four AAA batteries. However, if the AAAs drain, then you'll lose all the contents of RAM memory. The lithium battery will preserve the memory long enough for you to replace the AAAs. So, if you don't care about what you have stored in the RAM, you can use the calculator without the lithium battery.

Aug 11, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

TI85 will not work.


TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

May 26, 2009 | Texas Instruments TI-85 Calculator

1 Answer

How copy and past on ti85


Try using the LINK85.EXE that came with the TI-85. http://education.ti.com/downloads/files/computer_software/link85.exe if you do not have it. You will also need the cable that came with the TI85. It connects to a serial port and the TI85. It runs in a DOS window that allows you to copy and program written on the TI85 to a pc and then converter to ASCII and back to the program and uploaded.

Mar 26, 2009 | Texas Instruments TI-85 Calculator

1 Answer

Doest turn on.


It might be turning on but the screen may be to light. Try pressing on then darkening the screen by holding 2nd and the up arrow. If it works then you're welcome; if not then sorry i led you astray.

Mar 04, 2008 | Texas Instruments TI-85 Calculator

2 Answers

Blakck screen


Batteries:
Make sure to replace the "battery backup" too the little lithium ion battery

Try Adjusting contrast:
Hold down "[2nd]" key press up or down arrow repeatedly to lighten or darken contrast.

First attempt reseting:
Step 1: Remove all the batteries
Step 2: Hold "Clear" key down
Step 3: Still holding "Clear" key reinstall batteries
Step 4: Still holding "Clear" key press "On" key until home screen is displayed.

Second shot reseting:
remove all batteries including lithium ion (backup battery), wait 3 hours and reinstall batteries.

Third Shot reseting:
Step 1: Remove a battery
Step 2: Hold down "DEL" key reinstall battery
Step 3: Possible msg pops up saying "Waiting ... Please install software" IGNORE msg and take out battery again
Step 4: Reinstall battery do not hold down "DEL" key

reseting will cause the handheld to loose all of its stored memory.

Hope that helps!

Jan 20, 2008 | Texas Instruments TI-83 Plus Calculator

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