Casio 2872 Reference, Battery Power Indicator and Recover Indicator, Charging Precautions, Auto Return Features, Scrolling, Sensor Malfunction Indicator

Operation Guide 2872

Battery Power Indicator and Recover Indicator

The battery power indicator on the display shows you the current status of the rechargeable battery’s power.

Level		Battery Power							Function Status
				Indicator
1									All functions enabled.
2									All functions enabled.
3	l l		l l		l l	l			Except for timekeeping and
	l						l
	l								battery power indicator, all
								l
Battery power	l							l
		l		l	l l l	l		l	functions and display indicators
indicator
	(Charge Soon Alert)								are disabled.
4									All functions disabled.

• The flashing CHARGE indicator at Level 3 tells you that battery power is very low, and that exposure to bright light for charging is required as soon as possible.

• At Level 4, all functions are disabled, memory contents are cleared, and settings return to their initial factory defaults. Functions are enabled once again after the rechargeable battery is charged, but you need to set the time and date after the battery reaches Level 3 (indicated by the L indicator) from Level 4.You will not be able to set any of the other settings until the battery reaches Level 2 (indicated by the M indicator) after dropping to Level 4.

• Display indicators reappear as soon as the battery is charged from Level 4 to Level 3.

• Leaving the watch exposed to 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 level should be indicated after a few minutes.

	• If you use the backlight or alarms a number of
	times during a short period, RECOV. appears
	on the display and the backlight, alarm,
	countdown timer 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
Recover indicator	above functions are enabled again.

•Even if battery power is at Level 1 or Level 2, the Digital Compass Mode, Barometer/Thermometer Mode, or Altimeter 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 to perform a sensor operation in the Digital Compass Mode will cause xxx to appear on the display. In other sensor modes, the display will go blank. In the case of temperature, the last successfully measured value will appear on the display.

•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 six 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)	5 minutes
Sunlight Through a Window (10,000 lux)	24 minutes
Daylight Through a Window on a Cloudy Day (5,000 lux)	48 minutes
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

•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

•10 digital compass operations per week

•10 hours of altimeter measurements, once per month

•Stable operation is promoted by frequent 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 4	Level 3		Level 2		Level 1
			▲		▲		▲
Outdoor Sunlight	2 hours			16 hours		5 hours
(50,000 lux)
Sunlight Through a	4 hours			81 hours		23 hours
Window (10,000 lux)
Daylight Through a	7 hours			165 hours		45 hours
Window on a Cloudy
Day (5,000 lux)
Indoor Fluorescent	88 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 Data Recall, Alarm, Digital Compass, or Barometer/Thermometer Mode.

•If you do not perform any button operation while in the Altimeter Mode, the watch automatically returns to the Timekeeping Mode after nine or 10 hours.

•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.

•Holding down C for about one second while in the Stopwatch, Countdown Timer, or Data Recall Mode returns to the Timekeeping Mode.

Scrolling

The B and D 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, Err (error) will appear on the display and sensor operations will be disabled.

		Digital		Barometric		Altitude
	Compass			Pressure
					Measurement
Measurement			Measurement

•If Err appears while a measurement operation is being performed in a sensor mode, restart the measurement. If Err appears on the display again, it can mean there is something wrong with the sensor.

•Even if battery power is at Level 1 or Level 2, the Digital Compass Mode, Barometer/Thermometer Mode, or Altimeter Mode sensor may be disabled if there is not enough voltage available to power it sufficiently. In this case, Err will appear on the display. This does not indicate malfunction, and sensor operation should resume once battery voltage returns to its normal level.

•If Err 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.

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