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E-6
2. Using the Backlight
(fx-9860GII SD/fx-9860GII/fx-9860GII s/fx-9860G AU PLUS only)
Your calculator is equipped with a backlight for easy reading, even in the dark. You can
conserve battery power by limiting backlight operation to only when you need it.
u To turn the backlight on or off
Press !K(LIGHT) to toggle the backlight on and off.
• Changing the Backlight On/Off Key
You can configure the calculator so the backlight turns on when any key is pressed, instead of
requiring the !K(LIGHT) to toggle the backlight on and off. For details, see “To specify
the backlight key” (page 12-2) in the separate Software User’s Guide.
• Backlight duration
The backlight turns off automatically if you do not perform any key operation for a preset
amount of time (30 seconds or 10 seconds).
• If you perform a key operation, the backlight duration will be extended for the applicable
preset amount of time (30 seconds or 10 seconds).
• See “To specify the backlight duration” (page 12-2) in the Software User’s Guide for
information about how to specify 30 seconds or 10 seconds as the backlight duration time.
• Backlight and Battery Life
• Frequent use of the backlight will shorten battery life.
• The following are guidelines that show how battery life is affected by backlight use. It is
based on a new set of alkaline batteries at a temperature of 25°C.
Backlight Use Approximate Battery Life
5 minutes calculation*
1
, 55 minutes display per hour; no
backlight use
200 hours (80 hours*
2
)
5 minutes calculation*
1
, 55 minutes display, 3 minutes
backlight operation per hour
190 hours (75 hours*
2
)
5 minutes calculation*
1
, 55 minutes display, 15 minutes
backlight operation per hour
150 hours (70 hours*
2
)
5 minutes calculation*
1
, 55 minutes display per hour;
continuous backlight use
80 hours (50 hours*
2
)
*
1
fx-9860GII SD: 5 minutes SD card access
*
2
fx-9860GII SD only
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