Casio SF-4985ER - Manual (Page 24)

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PART 2 Operation Reference
•
If either of the messages (A or B) shown on page 13 appears on the display,
follow the procedures described on page 14.
•
If a low battery power message appears on the display or if the display
remains blank when you turn power on, replace batteries as soon as
possible.
2. Press OFF to switch power off.
About the Auto Power Off function...
The SF Unit is equipped with an Auto Power Off function that switches power off
automatically whenever you do not perform any key operation for about six
minutes. To restore power, press
ON .
To turn on the EL backlight
There are two ways to turn on the backlight of the display.
Pressing
LIGHT causes the backlight to turn on for about 15 seconds, and then
turn off automatically.
Pressing
SHIFT and then LIGHT also turns on the backlight, but in this case the
backlight stays on as long as you keep performing key operations on the SF Unit.
The backlight turns off automatically if you do not perform any key operation for
about 15 seconds.
Leaving the backlight on for long periods greatly reduces battery life!
You can manually turn the backlight off by pressing
LIGHT again.
Failure of the backlight to turn on indicates low battery power. Replace batteries
as soon as possible.
To adjust the display contrast
1. Enter the Telephone Directory Mode.
•
You could enter any mode except the Calculator Mode here.
2. Press SHIFT CONTRAST .
3. Use the H and J keys to adjust the contrast.
4. After you are finished, press ESC to clear the contrast adjustment display.