If the calculator does not turn on
If the HP 40gs does not turn on follow the steps below
until the calculator turns on. You may find that the
calculator turns on before you have completed the
procedure. If the calculator still does not turn on, please
contact Customer Support for further information.
1. Press and hold the
2. Press and hold the
simultaneously. Release the third menu key, then
3. Press and hold the
the sixth menu key simultaneously. Release the sixth
menu key, then release the first menu key, and then
4. Locate the small hole in the back of the calculator.
Insert the end of a straightened metal paper clip into
the hole as far as it will go. Hold it there for 1
second, then remove it. Press the
5. Remove the batteries (see "Batteries" on page R-4),
press and hold the
then put the batteries back in. Press the
Operating temperature: 0° to 45°C (32° to 113°F).
Storage temperature: –20° to 65°C (– 4° to 149°F).
Operating and storage humidity: 90% relative
humidity at 40°C (104°F) maximum. Avoid getting the
Battery operates at 6.0V dc, 80mA maximum.
The calculator uses 4 AAA(LR03) batteries as main power
and a CR2032 lithium battery for memory backup.
Before using the calculator, please install the batteries
according to the following procedure.
key for 10 seconds.
key and the third menu key
key, the first menu key, and
key for 10 seconds, and