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Casio FX-250HC Calculator battery
Problem My cannon calculator stopped working. I thought it was only solar powered but see that it's solar and battery powered. How do I change the battery? more...
Casio FX-250HC Calculator - Troubleshooting
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'Error' indication I have a NAVA calculator that has a permanent 'error' indication. At first I thought it just needed a new battery but I changed the battery and it still has the error indication. Help!? more...
Casio FX-250HC Calculator - Troubleshooting
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take the old battery to radio shack near you and buy a new one. more...
Casio FX-250HC Calculator - Troubleshooting
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Calculator HP 12 C When calculator is ON the display number can be read them. Battery are news. more...
Casio FX-250HC Calculator - Troubleshooting
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try removing its batteries first. if you don't feel like removing the battery then perform this operation! SHIFT 9 (CLR) 3 (ALL) = YES This will initialize the calculator and return the calculation mode and setup more...
Casio FX-250HC Calculator - Troubleshooting
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to watch the display to make sure that all your key operations are being performed correctly. Never leave dead batteries in the battery compartment. They can leak and damage the unit. Avoid using volatile liquids such as thinner or benzine to clean the unit. Wipe more...
Casio FX-250HC Calculator - User Guide (page #4)
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Before assuming malfunction of the unit, be sure to care- fully reread this manual and ensure that the problem is not due to low battery power or operational error. The contents of this manual are subject to change without notice. No part of this manual more...
Casio FX-250HC Calculator - User Guide (page #5)
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