Question about Casio JF-100TE Calculator

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Casio JF-100TE Battery Replacement

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.

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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.

Posted on Mar 06, 2009

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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.

Posted on Nov 23, 2013

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thank you,
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2. Using a small Phillips screwdriver, remove screws from back case.
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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.
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