Casio 5271 Operation Guide

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Operation Guide 5271/5278/5307

•• Your watch may differ somewhat from the one shown in the illustration.

Before Using the Watch for the First Time

•• Depending on your watch model, there may be a spacer installed at the factory around the crown. If your watch has a spacer, you should remove the spacer before using the watch.

•• After removing the spacer, use the procedures in “Crown Operations” and “To adjust the time setting” to set up the watch for use.

Hour Hand

Minute Hand

Setting time

Spacer

Crown

Crown

Second Hand

Solar Charging

A solar panel generates electrical power that charges a built-in (secondary) battery. The entire face is a solar panel, so power is generated when the face is exposed to light. Keep the watch exposed to light as much as possible.

Charging the Battery

When you are not wearing the watch, leave it where it is exposed to light. For stable operation, expose the watch to at least a half day of light per month.

When wearing the watch, try to keep your clothing from blocking its face (solar panel). Charging efficiency is reduced significantly even if the face is blocked only partially.

Caution!

•• The case of the watch may become quite hot when charging. Guard against burn injury after charging.

•• Avoid charging in the following locations, and anywhere else where the watch may become very hot.

−−On the dashboard of an automobile parked in the sun

−−Close to an incandescent light source or other sources of heat

−−Locations exposed to direct sunlight for long periods

	To adjust the time setting	Low Charge and Dead Battery Conditions
		An alert operation is performed when the battery charge goes low.
	When the second hand is at 12 o’clock, pull the Crown out.	Low Battery Alert
		The second hand will jump in two-second increments to alert you when the charge
		is low.

Rotate the Crown to change the time setting.

Push the Crown back in.

Note

•• When changing the time, move the minute hand four or five minutes past your final setting, and then back it up to the setting you want.

	Crown Operations	Crown
	Some water-resistant models (100 meters, 200 meters)
	have a screw-in crown. When you need to perform a crown
	operation, rotate it towards you to unscrew it. Then pull the
	crown out. Avoid applying undue force when pulling. The watch
	loses its water resistance while the crown is unscrewed. After
	performing a crown operation, fully screw the crown back in.
		Loosen
	If your watch has a rotary bezel...	Start
	You can rotate the bezel to align its ▼ mark with the
	minute hand. Then you will be able to tell how much
	time has elapsed since aligning the ▼ mark.
		Elapsed time
	Current

Specifications

Accuracy: ±20 seconds average per month

Other: Low battery alert

Power Supply: Solar panel and one rechargeable battery

Approximate battery operating time: 5 months

	Regular Timekeeping			Low Battery Alert
		Low charge
			Charged
			2-second jump
	Charging Time
	The times below are general guidelines for reference only.
	Charging Time to Support Daily Use
	Exposure Level (Brightness)			Approximate Charging Time
	Outdoor sunlight (50,000 lux)				8 minutes
	Sunlight through a window (10,000 lux)				30 minutes
	Daylight through a window on an overcast day				48 minutes
	(5,000 lux)
	Indoor fluorescent lighting (500 lux)				8 hours
	Charging Time to Recover from Dead Battery
	Exposure Level	Approximate Charging			Approximate Time to
		Time to 1-second Hand
	(Brightness)				Full Charge
		Movement
	Outdoor sunlight (50,000 lux)		3 hours		24 hours
	Sunlight through a window		11 hours		88 hours
	(10,000 lux)
	Daylight through a window on		17 hours		140 hours
	an overcast day (5,000 lux)
	Indoor fluorescent lighting		167 hours		– – –
	(500 lux)

Important!

The watch will continue to run for about five months after a full charge, even if it is not exposed to light. For stable operation, however, expose it to light as much as possible.

Note

Actual charging time depends on environmental conditions.

Over-charge Protection

Charging stops automatically when a full charge is attained. This protects against over-charging.

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