Casio fx-5800P, User Manual

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E-4
Operating Precautions
• Be sure to press the P button on the back of the calculator before using the
calculator for the fi rst time. See page 1 for information about the P button.
• Even if the calculator is operating normally, replace the battery at least once a year.
A dead battery can leak, causing damage to and malfunction of the calculator. Never
leave a dead battery in the calculator.
• The battery that comes with this unit discharges slightly during shipment and
storage. Because of this, it may require replacement sooner than the normal
expected battery life.
• Do not use an oxyride battery or any other type of nickel-based primary battery with
this product. Incompatibility between such batteries and product specifi cations can
result in shorter battery life and product malfunction.
• Low battery power can cause memory contents to become corrupted or lost
completely. Always keep written records of all important data.
• Avoid use and storage of the calculator in areas subjected to temperature extremes.
Very low temperatures can cause slow display response, total failure of the display,
and shortening of battery life. Also avoid leaving the calculator in direct sunlight, near a
window, near a heater or anywhere else it might be exposed to very high temperatures.
Heat can cause discoloration or deformation of the calculator’s case, and damage to
internal circuitry.
• Avoid use and storage of the calculator in areas subjected to large amounts of
humidity and dust.
Take care never to leave the calculator where it might be splashed by water or exposed to
large amounts of humidity or dust. Such conditions can damage internal circuitry.
• Never drop the calculator or otherwise subject it to strong impact.
• Never twist or bend the calculator.
Avoid carrying the calculator in the pocket of your trousers or other tight-fi tting clothing
where it might be subjected to twisting or bending.
• Never try to take the calculator apart.
• Never press the keys of the calculator with a ballpoint pen or other pointed object.
• Use a soft, dry cloth to clean the exterior of the calculator.
If the calculator becomes very dirty, wipe it off with a cloth moistened in a weak solution
of water and a mild neutral household detergent. Wring out all excess liquid before wiping
the calculator. Never use thinner, benzene or other volatile agents to clean the calculator.
Doing so can remove printed markings and can damage the case.