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Operation Guide 4325 4326
3
3. Press A to advance to AM/PM switching.
• This will cause the second hand to perform one full rotation starting from its
current position (either AM or PM), and then stop at its original current position.
4. Press B to toggle the second hand between AM and PM.
5. Coordinating with a time signal on the radio or TV, press A to restart normal
timekeeping. The second hand will move to 12 o’clock (zero seconds) at the start of
timekeeping.
• If you press A without changing the time setting (hour, minute, AM/PM), the second
hand will move to the current time position and timekeeping will resume from there.
• This watch normally receives a time calibration signal late at night. However, if you
configure the wrong AM/PM setting in step 3 of the above procedure, the watch will
start signal reception automatically during the afternoon. Signal reception during the
day is not as good as nighttime reception, so a wrong AM/PM setting can cause
signal reception problems.
Power Supply
This watch is equipped with a solar cell and a special rechargeable battery (secondary
battery) that is charged by the electrical power produced by the solar cell. The
illustration shown below shows how you should position the watch for charging.
Example:Orient the watch so its face is
pointing at a light source.
• The illustration shows how to position
a watch with a resin band.
• Note that charging efficiency drops
when any part of the solar cell is
blocked by clothing, etc.
• You should try to keep the watch
outside of your sleeve as much as
possible. Even if the face of the watch
is blocked from light only partially,
charging will be reduced significantly.
Solar cell
Important!
• Storing the watch for long periods in an area where there is no light or wearing it in
such a way that it is blocked from exposure to light can cause rechargeable battery
power to run down. Make sure that the watch is exposed to bright light whenever
possible.
• This watch uses a special rechargeable battery to store power produced by the solar
cell, so regular battery replacement is not required. However, after very long use, the
rechargeable battery may lose its ability to achieve a full charge. If you experience
problems getting the special rechargeable battery to charge fully, contact your dealer
or CASIO distributor about having it replaced.
• Never try to remove or replace the watch’s special battery yourself. Use of the wrong
type of battery can damage the watch.
• The current time and all other settings return to their initial factory defaults whenever
battery power drops to Level 2 and when you have the battery replaced.
• Keep the watch in an area normally exposed to bright light when storing it for long
periods. This helps to keep the rechargeable battery from going dead.
Battery Power Levels
The movement of the analog hands indicates the current battery power level.
• When all hands stop at 12 o’clock (Level 2), it means that battery power is quite low.
Expose the watch to light as soon as possible to charge the battery.
• When battery power is at Level 2, time calibration signal reception is disabled.
• At Level 2, all functions are disabled and settings return to their initial factory defaults.
• Even if the battery level drops to point that all functions become disabled, you still
will be able to recharge the battery and use the watch again.
Hand Movement
Normal.
All hands stop at 12
o’clock.
Level
1
2
Function Status
All functions enabled.
All functions disabled.
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.
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 four 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.
• Since these are the specs, we can include all the technical details.
• Watch is not exposed to light
• Internal timekeeping
• 6 minutes of signal reception per day
• Stable operation is promoted by frequent charging.
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
9 minutes
32 minutes
51 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.
• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
19 hours
68 hours
110 hours
– – –
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
Level 2 Level 1
3 hours
9 hours
14 hours
146 hours
Exposure Level
(Brightness)
▲
▲
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
• If you leave the watch in the Home Position Adjustment Mode and Receive Result
Mode for two or three minutes without performing any operation, it will return to the
Timekeeping Mode automatically.
• If you do not perform any operation for about two or three minutes while a setting
mode is selected, the watch will exit the setting mode automatically.
High-speed Hand Movement
• The B button is used to change the hand setting in various setting modes. In most
cases, holding down the B button will start high-speed movement of the applicable
hand(s).
• High-speed movement of the hands will continue until it completes a 12-hour cycle,
or until you press any button to stop it.
Radio-controlled Timekeeping Precautions
• Strong electrostatic charge can result in the wrong time being set.
• The time calibration signal bounces off the ionosphere. Because of this, such factors
as changes in the reflectivity of the ionosphere, as well as movement of the
ionosphere to higher altitudes due to seasonal atmospheric changes or the time of
day may change the reception range of the signal and make reception temporarily
impossible.
• Even if the time calibration signal is received properly, certain conditions can cause
the time setting to be off by up to one second.
• The current time setting in accordance with the time calibration signal takes priority
over any time settings you make manually.
• If you are in an area where proper time calibration signal reception is impossible, the
watch keeps time within ±20 seconds a month at normal temperature.
• If you have problems with proper time calibration signal reception or if the time
setting is wrong after signal reception, check the GMT differential setting.
The initial factory default GMT differential setting is GMT +1 (Module 4325) or
GMT +0 (Module 4326).
Transmitters
This watch is able to receive time calibration signals transmitted in Germany
(Mainflingen) and England (Anthorn). The following explains how the watch
determines which transmitter it should check first.
When GMT differential GMT+1 or GMT+2 is selected:
In this case:
The first signal search
operation after the GMT
differential setting has been
changed
The second and subsequent
signal searches
The watch does this:
1. Checks the Mainflingen signal first.
2. If the Mainflingen signal cannot be received,
checks the Anthorn signal.
1. Checks the signal of the transmitter of the first
receive operation (Anthorn or Mainflingen).
2. If the checked signal cannot be received, checks
the other signal.
In this case:
The first signal search
operation after the GMT
differential setting has been
changed
The second and subsequent
signal searches
The watch does this:
1. Checks the Anthorn signal first.
2. If the Anthorn signal cannot be received, checks
the Mainflingen signal.
1. Checks the signal of the transmitter of the first
receive operation (Anthorn or Mainflingen).
2. If the checked signal cannot be received, checks
the other signal.
When GMT differential GMT+0 is selected:
Timekeeping
• The current time in the Timekeeping Mode is calculated in accordance with the
current Greenwich Mean Time (GMT) differential setting.
• GMT differential is calculated by this watch based on Universal Time Coordinated
(UTC*) data.
*UTC is the world-wide scientific standard of timekeeping. It is based upon
carefully maintained atomic (cesium) clocks that keep time accurately to within
microseconds. Leap seconds are added or subtracted as necessary to keep UTC
in sync with the Earth’s rotation. The reference point for UTC is Greenwich,
England.