![]() ![]() If you have a Casio fx-451M that is no longer working, you can consider replacing the calculator with a modern equivalent. The passionate attention to detail characteristic of Japan, a country renowned for excellence in manufacturing, has resulted in calculators that deliver authentic value. There are two more retaining screws on the reverse which allow access to the battery.Ī sample of this calculator is held in the collection. Look for four crosshead screws that retain the front panel (don’t turn it over after these screws are been removed because there is nothing holding the buttons in place). The calculator then lifts out of the wallet, still attached by a ribbon cable to the right hand keypad. There are several plastic clips holding calculator body into the wallet part – be careful dismantling they can be quite fragile. ![]() It shouldn’t be difficult to get hold of this or an equivalent. The battery is a GR927 or SR57, which is button cell watch battery. The "M" version uses C-Power (meaning "continuous power") from the backup battery to maintain memory. This is a fairly rare folding scientific calculator. ![]() but the Japanese electronics company Casio produced the largest variety of models. The calculator was manufactured in Japan. Casio CFX 400 Scientific calculator watch circa 1985. The power source is Solar with battery backup. It has 44 keys, and an LCD (liquid crystal) display. The Casio fx-451M is a scientific calculator with 10 digits precision and algebraic logic. The calculator home page Home Download FAQ Online Calc Articles Database Resources About ☰ Casio fx-451M ![]()
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