Casio 2804 - Manual (Page 5)

Operation Guide 2804
5
• At Level 4, the display is disabled but timekeeping and other functions
continue to operate internally. Pressing any button causes the
Timekeeping Mode screen to appear for two or three minutes.
• At Level 5, all functions are disabled. Functions are enabled once again
after the rechargeable battery is charged, but anything previously stored in
memory is lost. Because of this, you must set the current time and alarms,
and re-input Data Bank records after the rechargeable battery is charged.
• Leaving the watch in direct sunlight or some other very strong light
source can cause the battery power indicator to temporarily show a
reading that is actually higher than the battery level. The correct
battery power indicator should appear after a few minutes.
•
Frequent backlight and alarm operations over a short period put a
heavy load on the battery, which can cause the battery power indicator
to flash, indicating that the backlight and alarm are disabled. Normal
operations should return after the battery recovers from the overload
condition. The above condition can occur after about consecutive 200
backlight operations or about 360 alarm operations.
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 a 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
Charging Guide
After a full charge, timekeeping remains enabled for up to about six
months, while the watch is used under the conditions described below.
Operating Conditions
•
Watch is not exposed to light
• 1 backlight operation (2 seconds) per day
•
20 seconds of alarm operation per day
Charge Times
Exposing the watch to light for the periods shown below each day
restores the power used by the above operating conditions.
Exposure Level (Brightness) Approximate
Exposure Time
Outdoor Sunlight (50,000 lux) 5 minutes
Sunlight Through a Window (10,000 lux) 25 minutes
Daylight Through a Window on a Cloudy Day 50 minutes
(5,000 lux)
Indoor Fluorescent Lighting (500 lux)
8 hours
• Stable operation is promoted by frequent charging.
Exposure Level
(Brightness)
▲ ▲ ▲
108 hours
3
hours
Approximate Exposure Time
Level 5 Level 4 Level 3 Level 2 Level 1
• The above exposure time values are all for reference only. Actual required
exposure times depend on lighting conditions.
Outdoor Sunlight
(50,000 lux)
Sunlight Through a Window
(10,000 lux)
21 hours
13
hours
Daylight Through a Window
on a Cloudy Day (5,000 lux)
– – –
25
hours
3
hours
14
hours
28
hours
18
hours
94
hours
188
hours
Recovery Times
The table below shows the amount exposure that is required to take the
battery from one level to the next.
To enter the Power Saving Mode
In any mode (except while figures are flashing
on the display for input), hold down C for
about two seconds.
• This enters the Power Saving Mode, which
causes all figures (except Power Saving
indicator) to disappear from the display.
Timekeeping and other functions continue to
be performed internally, however.
• Alarms, the Hourly Time Signal, and the
backlight are disabled while the watch is in
the Power Saving Mode.
• Pressing any button (except A) exits the
Power Saving Mode and enters the
Timekeeping Mode.
Power saving indicator
Power Saving Mode
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.
Auto Display
Auto Display is a demonstration feature that continually changes the
contents of the digital display. Note that you cannot use any of the
watch’s other functions while Auto Display is operating.
To turn off Auto Display
Hold down A for about two seconds until the watch beeps.
To turn on Auto Display
1. In any mode (except while figures are flashing on the display for input),
hold down C for about two seconds to enter the Power Saving Mode.
2. Hold down A for about two seconds until the watch beeps. This
indicates that Auto Display is on.
• Leaving the watch in a dark area can cause Auto Display operation to
stop. Normal operation should resume when the watch is again
exposed to light.
•
Auto Display cannot be turned on while the rechargeable battery is at
Level 4 or Level 5. Auto Display also turns off automatically whenever
the rechargeable battery drops to Level 4 or Level 5.
Auto Return Features
If you leave a screen with flashing digits or a cursor on the display for
two or three minutes without performing any operation, the watch
automatically saves anything you have input up to that point and exits the
setting screen.
Data and Setting 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 through the data at high speed.
Initial Screens
When you enter the Data Bank, World Time, or Alarm Mode, the data
you were viewing when you last exited the mode appears first.
Timekeeping
• The day of the week is automatically displayed in accordance with the
date (year, month, and day) settings.
• The year can be set in the range of 2000 to 2039.
• The watch’s built-in full automatic calendar automatically makes
allowances for different month lengths and leap years. Once you set
the date, there should be no reason to change it except when battery
power drops to Level 5.
12-hour/24-hour Timekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping
Mode is also applied in all modes.
• With the 12-hour format, the P (PM) indicator appears on the display
for times in the range of noon to 11:59 p.m. and no indicator appears
for times in the range of midnight to 11:59 a.m.
•
With the 24-hour format, times are displayed in the range of 0:00 to
23:59 without any indicator.
World Time
• GMT differential is calculated by this watch based on Universal Time
Coordinated (UTC) data.
• The seconds count of the World Time is synchronized with the
seconds count of the Timekeeping Mode.