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G-Shock GW-400CDJ-2JF User Manual

Operation guide 2931, Keep your watch exposed to light, Modes and display screens

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Operation Guide 2931

1

3.

Tips on how to keep the battery charged.

Try to ensure that the watch is always exposed to enough light to
keep its battery indicator at LEVEL 1 or LEVEL 2. Some of the
watch’s functions are disabled when battery power drops to
LEVEL 3.

Light

Level 1

Level 2

Level 3

Level 4

Battery Indicator

Rechargea-
ble battery

All functions
enabled

Some
functions
disabled

Whenever you are not wearing the watch on your wrist, position it
so the face (solar cell) is pointed in the direction of a source of
bright light.

Light

Solar Cell

Leave the watch under
fluorescent lighting, near a
window, etc.

When wearing the watch, try to keep your sleeve from blocking its
face (solar cell).

Charging efficiency is significantly
reduced even if the face of the
watch is only partially covered by
your sleeve.

Your watch runs on electrical power generated from light and stored by a rechargeable battery.
To ensure stable operation, make sure that the solar cell of the watch is exposed to light as much as possible.

1.

How the solar cell and battery work

When exposed to light

Light

Power supplied to watch

Solar cell

Electrical energy

Rechargea-
ble battery

Charge

When not exposed to light

Power supplied to watch

Discharge

Rechargea-

ble battery

Your watch continues to operate, even when it is not exposed to
light. Leaving the watch in the dark can run down its battery and
cause functions to become disabled.

2.

Avoid overuse of display illumination.

Over use of display illumination can run down the battery.

Power supplied to watch

Discharge

Rechargea-

ble battery

The following shows approximately how much exposure to light is
required to recharge the battery by the amount used by one
display illumination operation.

Sunlight through a window: 5 minutes

Indoor fluorescent lighting: 50 minutes

Care is required when using the full auto light switch, which
can cause frequent display illumination.

Keep your watch exposed to light!

Each press of the

C

C

C

C

C

button sounds a confirmation tone and cycles through available modes in the sequence shown below.

The watch will revert to the Timekeeping Mode automatically if you leave it in the Tide/Moon Graph Mode or Alarm Mode for about two or
three minutes without performing any operation.

Graphic Area

Day of the Week

Receive
indicator

Month, Day
Moon Graph

Battery
Indicator

PM indicator
(no display for AM)

Hour, Minute, Second

(Light)

(Display switching)

(Mode switching)

For information about temperature sensor calibration, see

“Setting the Home City Time and Date”.

For information about the Tide Graph, see “Using the Tide Graph”.

When you enter the Timekeeping

Mode from the Alarm Mode, the area
name (see the “Area List”) appears
first. After a short while, the display
changes to the date display.

Timekeeping Mode

Tide Graph

Temperature

Temperature Measurements

While the temperature screen is displayed, the watch takes
temperature measurements every two minutes.

When measuring outdoor temperatures, remove the watch

from your wrist and place it in a location where its readings will
not be affected by body temperature, sweat (water droplets),
direct sunlight, etc.

After removing the watch from your wrist, it takes about 20 to

30 minutes before the temperature of the watch becomes the
same as the outside temperature.

button

button

button

button

For details about the Moon Graph, see “Using the Moon

Graph (Moon Phase)”.

For details about the battery indicator, see “Battery

Indicator”.

For details about the receive indicator, see “Receive

Indicator”.

Elements in the graphic area appear and disappear to

indicate the passage of seconds.

Switching between Display Screens

Each press of the

cycles screen contents as shown below.

Tide/Moon Graph Mode

Timer Mode

Stopwatch Mode

World Time Mode

Alarm Mode

Mode Name

Year

PM indicator
(A for AM)

Month, Day

Tide Graph

Moon Graph

Mode Name

Timer Time

Mode Name

Time

City Code

World Time

Alarm Number

Alarm Time

Modes and Display Screens

MA0509-EA

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