crwdns2915892:0crwdne2915892:0
A business calculator from sometime in 1992.
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This is a sharp EL-840G business calculator from 1992. It is part of my small calculator collection, which I am now taking apart and putting the teardowns on Ifixit.
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I don’t remember where I got this calculator, but at least it came with the original instruction manual.
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This calculator also has 7 different functions, and is designed for business.
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To begin disassembly, remove the two screws from the metal case.
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Keep track of the screws! They are small and could cause potential injury if stepped on!
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Once the two screws are removed, carefully lift up on the lid of the calculator. Next, on the inside, there is a plastic cover on the PCB. Lift up on this cover to fully expose the PCB, so you can see it.
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The PCB is very simple, with only a small microcontroller, and a few diodes. The only other components are the LCD screen, and the solar panel, which also is connected to an optional lithium coin cell battery.
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I would provide identification for this chip, but It only says “JAPAN” on it, so I can’t find anything about it. But I now know that it is from Japan.
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