Casio 4326 Power Supply, Reference, Auto Return Features, High-speedHand Movement, Battery Power Levels, Charging Precautions, Charging Guide, Timekeeping

Operation Guide 4325 4326

3.Press Ato 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 Bto 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.

Recovery Times

The table below shows the amount exposure that is required to take the battery from one level to the next.

Exposure Level	Approximate Exposure Time
(Brightness)
	Level 2		Level 1
		▲	▲
Outdoor sunlight (50,000 lux)	3 hours		19 hours
Sunlight through a window	9 hours		68 hours
(10,000 lux)
Daylight through a window on	14 hours		110 hours
a cloudy day (5,000 lux)
Indoor fluorescent lighting	146 hours		– – –
(500 lux)

•The above exposure time values are all for reference only. Actual required exposure times depend on lighting conditions.

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.

Important!

Solar cell

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 Bbutton 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

•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.

Level	Hand Movement	Function Status
1	Normal.	All functions enabled.
2	All hands stop at 12	All functions disabled.
	o’clock.

•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.

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.

Exposure Level (Brightness)	Approximate Exposure Time
Outdoor sunlight (50,000 lux)	9 minutes
Sunlight through a window (10,000 lux)	32 minutes
Daylight through a window on a cloudy day	51 minutes
(5,000 lux)
Indoor fluorescent lighting (500 lux)	8 hours

•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.

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 watch does this:
The first signal search	1. Checks the Mainflingen signal first.
operation after the GMT	2. If the Mainflingen signal cannot be received,
differential setting has been	checks the Anthorn signal.
changed
The second and subsequent	1. Checks the signal of the transmitter of the first
signal searches	receive operation (Anthorn or Mainflingen).
	2. If the checked signal cannot be received, checks
	the other signal.

When GMT differential GMT+0 is selected:

In this case:	The watch does this:
The first signal search	1. Checks the Anthorn signal first.
operation after the GMT	2. If the Anthorn signal cannot be received, checks
differential setting has been	the Mainflingen signal.
changed
The second and subsequent	1. Checks the signal of the transmitter of the first
signal searches	receive operation (Anthorn or Mainflingen).
	2. If the checked signal cannot be received, checks
	the other signal.

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.

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