The case has two screws in the back at the top. Even with both screws removed the case halves (front and back) will not seperate. There are a couple of slide switches on the front. Other than that there are no other fasteners visible. The battery type (LR44) is molded into the back case. The Casio manual says something about taking it to a Casio service center to have the battery replaced. Yea right. That's bunk.
Remove two screws at top. Then there are 3 hidden **** on both the right and left side of unit for a total of 6. Pry the case apart starting at top on one side. Then slide a small thin screw drive down the side till you come to first *** and pry just a little till it comes apart. The first *** is on the side at display height center. The next *** is between the GT key and division key on side. The next *** is on side at top of plus key. The case will now swing open like a door with the same 3 **** on on side of case. The top of case **** are female. The bottom of case **** are male. The battery slides in and out. Make sure you get + and - right.
My problem is I changed the battery but display still only works with solar power.
Taking the back off The Casio JF-100 calculator is similar to the ...TE. Remove the two screws at the top back. Place a small screwdriver blade along the seam where the back plate fits into the front plate. There are 3 fasteners on each long side and 1 fastener on each of the front and back sides. Find the spot where it's the easiest to separate the back plate from the top plate (there are only two). Carefully twist the blade to cause an opening. Then proceed sequentially around the perimeter releasing each fastener. The front plate will easily separate from the back plate at this time. There are no parts that will fall-out--don't worry. Replace the battery. Press the front and back plates together to snap the fasteners.
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Take out the three small screws on the top of the back of the calculator then pry the two halves apart. You will find the small "button batteries fastened to the board. You need to bend up the small tab, remove the batteries and replace with similar battteries.
1. Remove slide cover. Place calculator face down. 2. Using a small Phillips screwdriver, remove screws from back case. 3. Remove back case. 4. Remove discharged batteries. Caution: Avoid contact with other calculator components while changing batteries. 5. Install new batteries positive side up, as shown on diagram inside case. 6. Replace back case, and then replace screws. 7. Press off on on. Caution: Dispose of old batteries properly. Do not incinerate batteries or leave where a child can find them. Your calculator cannot hold data in memory when batteries are removed or become discharged.
Undo 3 screws on the back. The rest of the case clips together along the outside edges, wriggle and pull the two halves apart (gently). Battery is easily visible and accessible. LR44, replace with + upwards. When you have reassembled the case you might need to press the reset button (on the back, small black dot, use a pen or similar to push it) before the calculator functions again.
The SC150X is powered by 2 AG-10/389 batteries. Take out the screw on the back panel and pry the case halves apart. After installing the new batteries and reassembling the case, press the 'reset' with a small paperclip while pressing the OFF button.
The back does come out - took me 20 minutes to figure out how without breaking it. After you take the screws out of the back, put a flat head screwdriver or a small coin (US dime) into one of the two slots on the top of the calculator. Start to flex the coin to separate the halves of the unit near the top, and keep the space open. Slide your dime around to the side of the calculator, and you'll be able to separate the light grey part from the black part - and the calculator will then come apart. Good luck.
Does pressing the '6' key do nothing? If so, it sounds like the '6' key is stuck. Try repeatedly tapping on the '6' key to get it un-stuck.If that doesn't work, it's probably time to get a new calculator.
One would think the logical approach would be to pull the top apart but I use a butter knife (the common knife one would use at the dinner table) and slide it in at the bottom, prying up as I go. Then it becomes clear that the top is "hinged" and one can just keep pulling the front and back apart until they separate without fear of damage. The only sticking point (literally) is where the front narrows down on a horizontal line between the "on/clear" button and the first row of buttons that begins with the yellow "2nd" button. It is at that point where the front and back snap together.
According to TI's guidebook for this calculator (get it here), you just separate the case back from the front. It may be that there are tabs that snap together as well. If you're sure you have all the screws out, try starting to separate the halves with your fingernail at the bottom edge. Once it's started it should come apart. We have a bunch of TI calculators at the school where I work (not that model) and some of them have been tough to open at first.