Manual Casio 5398 - GA-400 (page 5 of 6) (English)

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Operation Guide 5398

E-49

Button Operation Tone

You can turn the button operation tone on or off as

desired.

• Even if you turn off the button operation tone, the

stopwatch countdown tone, alarms, the Hourly Time

Signal, and other beepers all operate normally.

To turn the button operation tone on and off

In the Timekeeping Mode, hold down A until the

ﬂ ashing Hold indicator disappears from the display

and the currently selected city code appears on the

right side of the upper display.

2. Press C eight times to display the button operation

tone On/Off screen (page E-22).

The screen will show either KEY

or MUTE.

E-48

3. Press C.

• This enters the hour and minute hand adjustment

mode.

• Press C again* to enter the timer hand adjustment

mode.

* Nothing will happen if you press C while the hands

are moving.

4. If the hour and minute hands are not at 12o’clock,

rotate the rotary switch to adjust them until they are.

5. Press A to return to the Timekeeping Mode.

Check to make sure that the time indicated by the

hands matches the time on the digital display. If the

times don’t match, perform the correction procedure

above again.

Hour hand and minute hand

E-47

Adjusting Hand Positions

The watch hands can go out of alignment with the time on the digital display if it

is exposed to strong magnetism or impact. If this happens, you should adjust the

hand positions.

Important!

• You do not need to perform the operation below as long as the analog hands

indicate the same time as the digital display.

1. Hold down A for about ﬁ ve seconds until

Sub

appears.

• This indicates the timer hand adjustment mode.

2. If the timer hand is not at 12 o’clock, rotate the rotary

switch to adjust it until it is.

Timer hand

E-46

Auto light switch precautions

• Illumination may not turn on if the face of the watch is more than

15degrees above or below parallel. Make sure that the back of

your hand is parallel to the ground.

• Leaving auto light enabled can run down the watch's battery due

to frequent display illumination.

• Static electricity or magnetic force can interfere with proper

operation of the auto light switch. If illumination does not turn on,

try moving the watch back to the starting position (parallel with

the ground) and then tilt it back towards your face again. If this

does not work, drop your arm all the way down so it hangs at

your side, and then bring it back up again.

• You may notice a very faint clicking sound coming from the watch when it is

shaken back and forth. This sound is caused by mechanical operation of the auto

light switch, and does not indicate a problem with the watch.

• To protect against running down the battery, auto light switch operation

automatically disables approximately six hours after you enable it.

E-45

To enable or disable the auto light switch

In the Timekeeping Mode, hold down B for at least three

seconds to toggle the auto light switch between enabled

(LT displayed) and disabled (LT not displayed).

• The auto light switch enabled indicator (LT) is displayed

in all modes while the auto light switch is enabled.

Illumination Precautions

• The LED that provides illumination loses power after

very long use.

• Illumination may be hard to see when viewed under

direct sunlight.

• Illumination turns off automatically whenever an alarm

sounds.

• Frequent use of illumination runs down the battery.

Auto light switch enabled

indicator

E-44

• When you are wearing the watch, make sure that its auto light switch is

disabled before riding on a bicycle or operating a motorcycle or any other

motor vehicle. Sudden and unintended operation of the auto light switch

can create a distraction, which can result in a trafﬁ c accident and serious

personal injury.

Note

• The auto light switch is always disabled, regardless of its on/off setting, when any

one of the following conditions exists.

While an alarm is sounding

While a hand shift operation is in progress

E-43

About the Auto Light Switch

Enabling the auto light switch causes illumination to

turn on, whenever you position your wrist as described

below in any mode.

Moving the watch to a position that is parallel to the

ground and then tilting it towards you more than

40degrees causes illumination to turn on.

Warning!

• Always make sure you are in a safe place whenever you are reading the

display of the watch using the auto light switch. Be especially careful when

running or engaged in any other activity that can result in accident or

injury. Also take care that sudden illumination by the auto light switch does

not startle or distract others around you.

More than

40°

Wear the watch on the

outside of your wrist

E-42

To change the illumination duration

1. In the Timekeeping Mode, hold down A until the ﬂ ashing Hold indicator

disappears from the display and the currently selected city code appears on the

right side of the upper display.

2. Press C nine times to display the illumination duration setting screen.

• The current illumination duration setting (1 or 3) will be ﬂ ashing in the middle

display.

• See the sequence in step 2 of the procedure under “To conﬁ gure the digital time

and date settings” (page E-21) for information about how to scroll through setting

screens.

Rotate the rotary switch to toggle the illumination duration between three

seconds (3displayed) and 1.5seconds (1displayed).

4. After all the settings are the way you want, press A to exit the setting screen.

E-41

Illumination

The display of the watch is illuminated for easy reading in the dark. The watch’s

auto light switch turns on illumination automatically when you angle the watch

towards your face.

• The auto light switch must be turned on (page E-45) for it to operate.

To turn on illumination manually

Press B in any mode to illuminate the display.

• You can use the procedure below to select either 1.5 seconds or three seconds as

the illumination duration.

• The above operation turns on illumination regardless of the current auto light switch

setting.

E-40

• Before starting a countdown timer operation, check to make sure that a

countdown operation is not in progress (indicated by the seconds counting down).

If it is, press T to stop it and then D to reset to the countdown start time.

To stop the alarm

Press any button.

Directly Entering the Countdown Timer Mode from the Timekeeping Mode

• While the Countdown Timer is stopped and reset to the countdown start time, you

can use the operations below to directly enter the Countdown Timer Mode from

the Timekeeping Mode.

− In the Timekeeping Mode, rotate the rotary switch. If you do not change the

Countdown Timer start time setting within about 10 seconds, the watch will

automatically return to the Timekeeping Mode.

− In the Timekeeping Mode, press T. This will enter the Countdown Timer Mode

and start a countdown operation from the currently set start time.

How to remove the illumination function of Casio 5398 - GA-400? That is the light would not be lit on after button B is pressed. Submitted on 18-8-2022 at 11:48
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How to turn off the illumination function of a G-shock GA-400 permanently? That is, the light would not on even button B is pressed. Submitted on 16-8-2022 at 18:39
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Casio 5398 - GA-400 Manual

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