Key facts
- Brand
- Casio
- Model
- FX-991ES
- Category
- Other Electronics
- Industry
- Electronics
- Documents
- 7
- Languages
- EN · ES · JA · ZH
- Last added
- 2012-06-06
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Casio FX-991ES User Manual
This manual introduces the Casio FX-991ES scientific calculator, covering initial setup, key notation, and example problems. It explains how to attach and remove the hard case, and how to reset the device to its initial state.
Safety precautions, battery handling, and proper care are detailed to ensure reliable operation. The guide also describes how to change display modes, angle settings, and provides maintenance advice such as cleaning and storage. This manual is written in Japanese.
Casio FX-991ES specifications
| Solar Cell | Built into the front of the calculator |
|---|---|
| Button Battery | G13 Type (LR44) × 1 |
| Battery Life | Approximately 3 years |
| Weight | 105 g (3.7 oz) |
All Casio FX-991ES documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
- Casio fx-115ES / fx-991ES Calculator User Manual 75 p
- Casio FX-115ES/991ES User Manual 75 p
- Casio FX-991ES User Manual 174 p
- Casio fx-115ES / fx-991ES User Guide 75 p
- Casio fx-991ES Scientific Calculator User Manual 76 p
- Casio FX-991ES Scientific Calculator User Manual 174 p
- Casio fx-991ES User Manual 76 p
Questions answered in these manuals
How do I reset the calculator to its default settings?
Press [SET] [9] (CLR) [3] (All) [≡] (Yes) to initialize all modes and clear memory.
What does the "S" indicator on the display mean?
The "S" indicator shows that the keypad has been shifted by pressing the SHIFT key.
How do I replace the battery?
Remove the old battery, insert a new G13 (LR44) battery, and ensure the positive and negative contacts are correctly aligned.
What are the operating temperature limits?
The calculator can be used between 0 °C and 40 °C.
What must be done before using the calculator for the first time?
Press the (6) key before first use.
How can I replace the battery?
Remove the hard case, unscrew the battery cover, take out the old battery, wipe the new battery with a dry cloth, insert it with the positive side up, then replace the cover and screw.