Casio 2825 Operation Manual page 7

• At Level 4, all functions are disabled and settings return to their initial
factory defaults. Once the battery reaches Level 2 (M) after falling to Level
4, reconfigure the current time, date, and other settings.
• Display indicators reappear as soon as the battery is charged from Level 4
to Level 3.
• 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
higher than the actual battery level. The correct battery power indicator
should appear after a few minutes.
• If you use the backlight or the alarm a number
of times during a short period, RECOV.
appears on the display and the backlight,
alarm, hourly time signal, and sensor
operations become disabled until battery power
recovers.
After some time, battery power will recover and
RECOV. will disappear, indicating that the
above functions are enabled again.
Recover indicator
• Even if battery power is at Level 1 or Level 2, the Digital Compass Mode,
Barometer/Thermometer Mode, or Depth Gauge Mode sensor may be
disabled if there is not enough voltage available to power it sufficiently. This
is indicated by RECOV. on the display.
If battery power goes low while a measurement operation is in progress,
the value produced by the last successful measurement operation remains
on the display. Attempting a measurement operation while battery power is
too low will cause the display to go blank.
Sensor operation should resume when battery voltage returns to normal
levels.
• If RECOV. starts to flash while a Depth Gauge Mode depth measurement
operation is in progress, the measurement operation will continue. Though
the elapsed measurement time will be recorded in log memory, maximum
depth and water temperature values are not. In this case,
in place of the maximum depth and water temperature. After you surface
from your dive, hold down D for about three seconds to exit the Depth
Gauge Mode to clear RECOV.
• If RECOV. appears frequently, it probably means that remaining battery
power is low. Leave the watch in bright light to allow it to charge.
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 five months.
• 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.
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)
• Since these are the specs, we can include all the technical details.
• Watch is not exposed to light
• Internal timekeeping
• Display on 18 hours per day, sleep state 6 hours per day
• 1 backlight operation (1.5 seconds) per day
• 10 seconds of alarm operation per day
• 1 direction reading (20 seconds continuous measurement) per day
• 30 seconds of Barometric/Thermometer Mode measurements per
day
• Stable operation is promoted by frequent charging.
Operation Guide 2825
xx . x is displayed
Approximate
Exposure Time
5 minutes
24 minutes
48 minutes
8 hours
Recovery Times
The table below shows the amount exposure that is required to take the
battery from one level to the next.
Approximate Exposure Time
Exposure Level
(Brightness) Level 4
Outdoor Sunlight 1 hour
(50,000 lux)
Sunlight Through a
4 hours
Window (10,000 lux)
Daylight Through a
6 hours
Window on a Cloudy
Day (5,000 lux)
Indoor Fluorescent 71 hours
Lighting (500 lux)
• The above exposure time values are all for reference only. Actual required
exposure times depend on lighting conditions.
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 Return Features
• The watch automatically returns to the Timekeeping Mode if you do not
perform any button operation for two or three minutes in the Digital
Compass and Barometer/Thermometer Mode.
• The watch automatically returns to the Timekeeping Mode if a depth
measurement operation (indicated by ongoing elapsed time measurement
in the upper part of the display) in the Depth Gauge Mode continues for
more than three hours. If there is no depth measurement operation being
performed (indicated by (or 0 ) in the center part of the display and no
ongoing elapsed time measurement in the upper part of the display), the
watch automatically returns to the Timekeeping Mode if you do not perform
any button operation for about one hour in the Depth Gauge Mode.
• If you leave a screen with flashing digits on the display for two or three
minutes without performing any operation, the watch automatically exits the
setting screen.
Scrolling
The B and E buttons are used on the setting screen 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.
Sensor Malfunction Indicator
Subjecting the watch to strong impact can cause its sensor to malfunction or
improper contact of internal circuitry. When this happens, the message
will appear on the display and sensor operations will be disabled.
DIgital
Barometric
Compass Pressure
Measurement
Measurement
• If appears during digital compass or barometric pressure
Err
measurement, it will disappear from the display as soon as measurement is
successful again.
• During depth measurement, elapsed dive time measurement continues
even if is on the display. After you surface from your dive, hold down
Err
D for about three seconds to exit the Depth Gauge Mode. The
message should no longer be on the display when you re-enter the Depth
Gauge Mode.
• If Err appears during Depth Gauge digital compass measurement, wait 5
or 6 seconds (or press B) to return to the Elapsed Measurement Time/
Current Depth screen. This should clear the
• If the Err message keeps appearing during measurement, it could mean
there is a problem with the applicable sensor.
Whenever you have a sensor malfunction, be sure to take the watch to
your original dealer or nearest authorized CASIO distributor as soon as
possible.
Power Saving Function
When turned on, the Power Saving function automatically puts the watch into
a sleep state whenever it is left for a certain period in an area where it is dark.
The table below shows how watch functions are affected by the Power Saving
function.
Level 3 Level 2 Level 1
15 hours 3 hours
73 hours 15 hours
149 hours 30 hours
- - - - - - - - - - - - - - - -
Err
Depth Depth Gauge
Measurement Digital Compass
Measurement
Err
Err message from the display.
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