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The Algebra FX manual does not list this error. However I looked into some other Casio Calculator's manual and here is what I found. It might help you decide what to do next.
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Not familiar with an error 400 - and error 40 is an elevation error - it needs to be addressed(fixed) cannot really be reset otherwise. Check connections and fuses first. If it was recently put together, make sure the data cable was not pinched. If it is battery operated, an error 40 can occur when the battery is low.
F2-04- Improper cartridge (destination error, life cycle error) Identification error model error type error destination error data abnormality Misc error
Cause-A toner cartridge of a different destination is installed. EEPROM trouble Check the destination setup. Toner cartridge CRUM PWB trouble MCU PWB trouble CRUM connector disconnection
Check and remedy- Install a specified toner cartridge. Check the SIM 26-6 setup. Replace the EEPROM. Replace the toner cartridge. Replace the MCU PWB. Check connection of the CRUM connector. Execute SIM 16.
according the manual F2-04 means drum data read problem,may be it can be reset why don't give a try;
1, power on,
2, press "clear","interupt", "0", "interupt"
3, press 14 prss start
4, press clear
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