G-Shock GR-8900 - Manual (Page 5)

Operation Guide 3269
E-40
Charging Precautions
Certain charging conditions can cause the watch to become very hot. Avoid leaving
the watch in the areas described below whenever charging its rechargeable battery.
Also note that allowing the watch to become very hot can cause its liquid crystal
display to black out. The appearance of the LCD should become normal again when
the watch returns to lower temperature.
Warning!
Leaving the watch in bright light to charge its rechargeable battery can cause it
to become quite hot. Take care when handling the watch to avoid burn injury.
The watch can become particularly hot when exposed to the following
conditions for long periods.
• On the dashboard of a car parked in direct sunlight
• Too close to an incandescent lamp
• Under direct sunlight
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Charging Guide
• The following table shows the amount of time the watch needs to be exposed to light
each day in order to generate enough power for normal daily operations.
• For details about the battery operating time and daily operating conditions, see the
“Power Supply” section of the Specifications (page E-52).
• Stable operation is promoted by frequent exposure to light.
Exposure Level (Brightness)
Outdoor Sunlight (50,000 lux)
Sunlight Through a Window (10,000 lux)
Daylight Through a Window on a Cloudy Day (5,000 lux)
Indoor Fluorescent Lighting (500 lux)
Approximate
Exposure Time
5 minutes
24 minutes
48 minutes
8 hours
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Recovery Times
The table below shows the amount exposure that is required to take the battery from
one level to the next.
• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
Approximate Exposure Time
Level 5 Level 4 Level 3 Level 2 Level 1
3 hours 33 hours 9 hours
10 hours 125 hours 34 hours
15 hours 202 hours 54 hours
173 hours - - - - - - - - - - - - - - - -
Exposure Level
(Brightness)
Outdoor Sunlight
(50,000 lux)
Sunlight Through a
Window (10,000 lux)
Daylight Through a
Window on a Cloudy
Day (5,000 lux)
Indoor Fluorescent
Lighting (500 lux)
▲ ▲ ▲
E-43
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Graphic Area
The information shown in the graphic area depends on the current mode.
Mode
Timekeeping
World Time
Alarm
Stopwatch
Countdown Timer
Graphic Area
Timekeeping Mode seconds
Timekeeping Mode seconds
Rotates when the time is reached
Stopwatch Mode 1/10 seconds
Countdown Timer Mode seconds
Rotates when the time is reached
Graphic Area
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Button Operation Tone
The button operation tone sounds any time you press one
of the watch’s buttons. You can turn the button operation
tone on and off as desired.
• Even if you turn off the button operation tone, the
alarms, the Hourly Time Signal, and the countdown
alarm all operate normally.
To turn the button operation tone on and off
1. In the Timekeeping Mode, hold down A until the
display contents start to flash. This is the setting screen.
2. Press C nine times to display the current button
operation tone setting ( or ).
3. Press D to toggle the button operation tone on ( )
or off ( ).
4. Press A to exit the setting screen.
• The MUTE indicator is displayed in all modes when the
button operation tone is turned off.
MUTE indicator
E-45
Power Saving Function
When turned on, the Power Saving function enters a sleep
state automatically whenever the watch is left in an area
for a certain period where it is dark. The table below
shows how watch functions are affected by the Power
Saving function.
Power saving on indicator
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• Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
• The watch will not enter the sleep state between 6:00 AM and 9:59 PM. If the watch
is already in the sleep state when 6:00 AM arrives, however, it will remain in the
sleep state.
To recover from the sleep state
Perform any one of the following operations.
• Move the watch to a well-lit area.
• Press any button.
• Angle the watch toward your face for reading (page E-32).
Elapsed Time
in Dark
60 to 70 minutes
6 or 7 days
Display
Blank, with Power Saving on indicator
(
) flashing
Blank, with Power Saving on indicator
(
) displayed (not flashing)
Operation
All functions enabled,
except for the display
Beeper tone, illumination,
and display are disabled.
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To turn Power Saving on and off
1. In the Timekeeping Mode, hold down A until the city
code starts to flash, which indicates the setting screen.
2. Press C eleven times until the Power Saving on/off
screen appears.
3. Press D to toggle Power Saving on ( ) and off ( ).
4. Press A to exit the setting screen.
• The Power Saving on indicator ( ) is displayed in all
modes while Power Saving is turned on.
Auto Return
If you do not perform any operation for about two or three minutes while a setting
screen (with a flashing setting) is on the display, the watch will exit the setting screen
automatically.
l l l l ll
ll
ll ll ll
ll
lll
ll llll
ll
On/Off status
E-48
Scrolling
The B and D buttons are used in various modes and setting screens to scroll
through data on the display. In most cases, holding down these buttons during a scroll
operation scrolls at high speed.
Initial Screens
When you enter the World Time Mode, or Alarm Mode, the data you were viewing
when you last exited the mode appears first.
Timekeeping
• Resetting the seconds to 00 while the current count is in the range of 30 to 59
causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are
reset to
00 without changing the minutes.
• The year can be set in the range of 2000 to 2099.
• The watch’s built-in full automatic calendar makes allowances for different month
lengths and leap years. Once you set the date, there should be no reason to change
it except after you have the watch’s battery replaced or the battery drops to Level 5.
E-49
• The current time for all city codes in the Timekeeping Mode and World Time Mode is
calculated in accordance with the Coordinated Universal Time (UTC) for each city,
based on your Home City time setting.
World Time
The seconds count of the World Time is synchronized with the seconds count of the
Timekeeping Mode.
Illumination Precautions
• The electro-luminescent panel that provides illumination loses power after very long
use.
• Illumination may be difficult to see when viewed under direct sunlight.
• The watch may emit an audible sound whenever the display is illuminated. This is
due to vibration of the EL panel used for illumination, and does not indicate
malfunction.
• Illumination turns off automatically whenever an alarm sounds.
• Frequent use of illumination runs down the battery.