General Guide

Turning on or off

To turn the calculator on, press [ ON/AC ] ; To turn the calculator off, press [ OFF ].

Battery replacement

The calculator is powered by two alkaline batteries (G13 or LR44). When the display dims, replace the batteries. Be careful not to be injured when you replace the battery.

1.Unscrew the screws on the back of the calculator.

2.Insert a flat bladed screwdriver into the slot between the upper and lower case then carefully twist it to separate the case.

3.Remove both batteries and dispose of them properly. Never allow children to play with batteries.

4.Wipe off the new batteries with a dry cloth to maintain good contact.

5.Insert the two new batteries with their flat sides (plus termi- nals) up.

6.Align the upper and lower cases then snap them to close together.

7.Tighten the screws.

Auto power-off function

This calculator automatically turns it off when not operated for approximately 9~15 minutes. It can be reactivated by pressing [ ON/AC ] key and the display, memory, settings are retained.

Reset operation

If the calculator is on but you get unexpected results, press [ ON/AC ] and then [ MODE ] four times to display the below menu. A message appears on the display to confirm whether you want to reset the cal- culator and clear memory contents after pressing [ 2 ].

To clear all variables, pending operations, statistical data, answers, all previous entries, and memory, please press [ 2 ]. To abort the reset operation without clearing the calculator, please press [ 1 ].

If the calculator is lock and further key operations becomes impos- sible, please use a pointed object to press the reset hole to release the condition. It will return all settings to default settings.

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Citizen SR-270N manual General Guide, Turning on or off, Battery replacement, Auto power-off function, Reset operation