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Changing the batteries
The device requires a 3V lithium battery type CR2032, which is
already preinstalled. If the display remains blank after it has been
switched on the batteries are depleted. To change the batteries
open the battery compartment on the rear panel of the device.
For this unscrew both of the screws
> ; and remove the
battery compartment cover 2).
Before removing the old batteries please memorize their
>
position in the compartment by means of the inscription.
The plus sign is visible from the outside.
Remove the batteries and replace them with fresh ones of
>
the same type. Thereby the plus sign must still be visible
from the outside otherwise the device will not function and
could be damaged.
Place the battery compartment cover
> 2) back on and screw
it down rmly.
Handling of batteries
Leaking batteries can cause damage to the calculator trainer.
If you do not intend to use the calculator trainer for a long
>
period of time then remove the batteries.
When a battery has leaked put on protective gloves and
>
clean the battery compartment with a dry cloth.
Do not attempt to recharge the batteries.
>
Switching the device on and o
To switch the device on press the > button e. In the display q
the rst calculation task appears.
To switch the device o press the
> button e again.