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Operation Guide 5274

E-9

Charging Time to Recover from Dead Battery

Exposure Level 

(Brightness)

Approximate Charging 

Time to 1-second Hand 

Movement

Approximate Time to 

Full Charge

Outdoor sunlight (50,000 lux)

3 hours

24 hours

Sunlight through a window 
(10,000 lux)

11 hours

94 hours

Daylight through a window on 
an overcast day (5,000 lux)

18 hours

144 hours

Indoor fl uorescent lighting 
(500 lux)

175 hours

–  –  –

Important!

The watch will continue to run for about six 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.

E-8

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 
(5,000 lux)

48 minutes

Indoor fl uorescent lighting (500 lux)

8 hours

E-7

Low Battery Alert

The second hand will jump at two-second intervals to alert you when the charge is 
low.

2-second jump

Low charge

Regular Timekeeping

Low Battery Alert

Charged

E-6

Caution!

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

 

x

injury after charging.
Avoid charging in the following locations, and anywhere else where the watch may 

 

x

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

 

Low Charge and Dead Battery Conditions

An alert operation is performed when the battery charge goes low.

E-5

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 effi ciency is reduced signifi cantly 
even if the face is blocked only partially.

E-4

Contents

E-2 

Before Using the Watch for the First Time

E-5 Solar 

Charging

E-11  Indicators and Crown Operation

E-12  Setting the Current Time and Day

E-12 

To adjust the time setting

E-13 

To change the day indicator setting

E-14  Using the Stopwatch

E-18  Abnormal Hand Movement or Function

E-20 Specifi cations

E-3

Crown Operations

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.

Crown

Loosen

If your watch has a rotary bezel...

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.

Start

Elapsed time

Current

E-2

Before Using the Watch for the First Time

Crown

Spacer

 Depending on your watch model, there may be a spacer 

 

x

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 

 

x

Operations” (page E-3) and “To adjust the time setting” (page 
E-12) to set up the watch for use.

E-1

ENGLISH

 

 

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

 

x

MA1203-EA

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