Question about Tech Solution TS-900 Calculator

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On/off button does not work

I have not used this machine in some time, 4 years. I did replace the battery, but the only way I can turn it on is by pressing the AC key. When I do the display only shows 0. The numbers that I press will not show up on the display. What is wrongg here?

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Re: On/off button does not work

The ac key is you power on key. As far as not being able to input any numbers, make sure there is not a key that is stuck down or depressed. if so try to lift is up and you should be ok. Unless there was a liquid spill. In that case, cheaper to buy a new one.

Posted on Jun 16, 2007

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How to solve screen issue?

This is a Two Way power calculator: Solar cell and a battery. The FX9750 is a graphing calculator and not in the league of the FX85 MS. It has a backup battery and 4 AAA batteries.
Anyway, there is no reset key. If there is a reset button it must be on the back.
After you replace the battery press the ON key. It might be a good idea to leave calculator exposed to sun light or a fluorescent tube.

Jan 08, 2014 | Casio FX85MS Scientific Calculator

1 Answer

48GX has been idle for 4 years.Wont turn on. Is there an internal battery that I can replace?

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.

Main batteries:
  • 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.

Jan 11, 2011 | HP 48gx Calculator

2 Answers

I stop using my TI-86 for a few months and know

I hadn't used mine in years and had the same problem. Essentially you just need to give it a workout to get all the pixels working properly again and then it'll be just fine. I adjusted the contrast between full dark and nothing multiple times and turned the calculator on and off after each cycle and now it works like new.

Jul 06, 2010 | Texas Instruments TI-86 Calculator

1 Answer

I have a TI-83 that hasn't been used for a couple of years. I replaced tha 4 AAA batteries, turned on the calculator, but the screen just displayed one horizontal black line. I couldn't get it to respond...

Hope is what keeps the world turning.
Clean the electrical terminals even if they seem shiny. Use a clean eraser tip of a pencil.

Insert the main batteries.
If you see the line again, press [CLEAR] to see if it disappears.
Try resetting the RAM by pressing [2nd][MEM][7:Reset][1:All Ram][2:Reset] [ENTER][ENTER].

If screen is too light or too dark, adjust the contrast:
Press [2nd] key and release it
Press and HOLD Arrow (UP to darken, or DOWN to lighten) the screen.

If that does not solve the problem you may have to force the calculator to boot up. Details are in the article . Read the part on Ti83Plus family.
The article contains links to additional articles.
Hope it helps.

Oct 29, 2009 | Texas Instruments TI-83 Plus Calculator

3 Answers

I have a Casio fx4500 calculator and have replaced both batteirs with the new ones but it still says low battery everytime i turn it on.what seems to be the problem? Thanks

Seems to be a common problem on this otherwise great calculator that helped me through both high school and university. I've had mine for nearly 20 years and this problem showed up a few years ago. But I remember classmates reported the same problem when it was almost new.

If replacing batteries isn't helping, the problem is most likely caused by oxidation on the springs connecting the battery holder to the main PCB. The solution is as follows:

1. Remove the metal back cover (2 screws)
2. Remove the plastic back lid by removing the black screws (leave the batteries mounted) and CAREFULLY slide the back lid to the lower end (where the EXE button is located). Do not lift while sliding until the lid easily comes off.
3. On the back side of the plastic lid, very carefully bend the the two metal connectors ~1 mm on both batteryholders to increase their tension.
4. Clean the connecting pads on the PCB and the metal springs with de-oxidizer solvent.
5. Re-assemble and your 4500P calculator should be good as new.

Sep 04, 2009 | Casio Calculators

1 Answer

Screen is flashing 0.00

I had the same problem with my HP 11C. The following solution worked for me.
1. Remove the battery cover.
2. With the batteries in place (i.e. DO NO REMOVE THEM), use a small piece of wire (I used a standard staple bent at one end), short the terminals FOR A BRIEF MOMENT between both ends of the set of batteries (the HP-11C has three). This means somehow inserting the staple such that the contacts in the batteries receptacle are shorted.
3. The flashing will stop. Then push the ON button until the calculator turns on. If it does not work the first time, remove the batteries and resinsert them.
4. You may have to repeat this procedure. I had to do it twice before my calculator worked again.

Apr 28, 2009 | HP 12c Calculator

4 Answers

Screen fully black

Black-Screen/Black-Pixel Fix for TI-Calculator

This will erase all memory and reset defaults.

1. Remove 1 AAA Battery
2. Press and Hold 'ON' for 30 seconds
3. Replace AAA Battery
4. Adjust Contrast to appropriate level

If this fails, try again with ALL Batteries removed including
the backup Lithium Battery.

If all else fails, try the following reset procedure:

1. Remove ALL Batteries (inc. Backup)
2. Let Calculator sit with no batteries for 2~4 hours.
3. Hold 'ON' for 30 seconds.
4. Replace all the batteries (May be good idea to use new batteries
just in case old ones were dead)
5. Turn on Calculator
6. Change Contrast to appropriate level

- Remember to use correct batteries or calculator may not work. The
correct batteries are Alkaline, Rechargable Batteries are TOO WEAK,
Heavy Duty batteries are TOO STRONG.

Oct 09, 2008 | Texas Instruments TI-89 Calculator

4 Answers

TI-83 Plus Problem

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 29, 2008 | Texas Instruments TI-83 Plus Calculator

2 Answers

The calculator casio CFX 9850GA was not turning on..

first:you must clean battery compatrment in direction of contact point with good contact cleaner from any electronic store near you or from radio shack.
second:clean power switch with contact cleaner.

Dec 21, 2007 | Casio CFX 9850GA Plus Calculator

3 Answers

Sharp Elsimate 1611P 12 digit Calculator

It sounds like there is a printer error. Take of the cover where the paper is. There should be a little ink roller. Try taking this out and look in and see if the rubber band with the numbers on it is broken. If so, the machine is not worth repairing, unless you can get it replace under warranty. If it is not broken, try turning the machine on and off with the ink roll out of the machine. This should reset the print head as long as nothing is in there jamming it up. Good luck John

Jun 12, 2007 | Sharp EL-1611P Calculator

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