Casio gw3500b-1a Guida Utente

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MA1002-EA

Congratulations upon your selection of this CASIO watch.

This watch does not have a city code that corresponds to the UTC offset of –3.5 
hours. Because of this, the radio-controlled atomic timekeeping function will not 
display the correct time for Newfoundland, Canada.

Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any 
damage or loss suffered by you or any third party arising through the use of this 
product or its malfunction.

Button operations are indicated using the letters 

A 

through 

D shown in the illustration.

Hand Functions
z 

z  Hour Hand

x 

x  Second Hand

c 

c  Minute Hand

v 

v  Left Dial Hand: 

 Indicates the current day of the week and current 
mode.

b 

b  24-hour Hand: 

 Indicates the current 24-hour timekeeping hour.

n 

n  Right Dial Hands:  Indicate a time, in 24-hour format, depending on the current 

mode.

m 

m  Day
This User’s Guide uses numbers shown above to identify watch hands and indicators.

C at least two seconds to enter the Timekeeping Mode, and 

x Second Hand.

Is the 

x Second Hand moving smoothly at one-second intervals?

Is the 

x Second Hand moving at 

two-second intervals or is it stopped 
completely? 

Go to step 2.

The watch is charged suffi ciently. 
For details about charging, see 
“Charging the Watch”.

Power is low. Charge the watch by placing it 
in a location where it is exposed to light. For 
details, see “Charging the Watch”.

NO

YES

YES

NEXT

Use the procedure under “To confi gure Home City settings” to confi gure your Home 
City and daylight saving time settings.

Important!
Proper time calibration signal reception and World Time settings depend on correct 
Home City, time, and date settings in the Timekeeping Mode. Make sure you 
confi gure these settings correctly.

 

 

• To set the time using a time calibration signal

See “To get ready for a receive operation”.
 

 

• To set the time manually

See “Confi guring Current Time and Date Settings Manually”.

 For details about the watch’s radio contr olled timekeeping feature, see “Radio 

 

•

Controlled Atomic Timekeeping”.

The face of the watch is a solar cell that generates power from light. The generated 
power charges a built-in rechargeable battery, which powers watch operations. The 
watch charges whenever it is exposed to light.

Whenever you are not 
wearing the watch, leave 
it in a location where it is 
exposed to light.

 Best charging 

 

•

performance is achieved 
by exposing the watch to 
light that is as strong as 
possible.

When wearing the watch, 
make sure that its face is 
not blocked from light by the 
sleeve of your clothing.

 The watch may enter a 

 

•

sleep state if its face is 
blocked by your sleeve 
even only partially.

On the dashboard of a car parked in direct sunlight

 

•

Too close to an incandescent lamp

 

•

Under direct sunlight

 

•
Important!

 Keep the watch in an area normally exposed to bright light when storing it for long 

 

•

periods. This helps to ensure that power does not run down.
 Storing the watch for long periods in an area where there is no light or wearing it in 

 

•

such a way that it is blocked from exposure to light can cause power to run down. 
Make sure that the watch is exposed to bright light whenever possible.

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You can get an idea of the watch’s power level by 
observing the movement of the 

x Second Hand in the 

Timekeeping Mode.

 If the 

 

•

x Second Hand is moving normally at one-second 

intervals, power is at Level 1.
 If the 

 

•

x Second Hand is moving at two-second intervals, 

power is at Level 2, which is quite low. Expose the watch 
to light as soon as possible so it can charge.

1

Normal.

All functions enabled

2

x Second Hand moves at two-second 

intervals.

m Day changes to 1 (home position).

Beeper, time calibration signal 
reception disabled

3

x Second Hand stopped.

 z

 z Hour Hand and c Minute Hand 

stopped at 12 o’clock.

All functions disabled

 When power drops to Level 3, all functions will be disabled but the watch will 

 

•

continue to keep time internally for about one week. If you recharge the battery 
suffi ciently during this period, the analog hands will move automatically to the 
correct setting and regular timekeeping will resume. After one week, all settings 
(including timekeeping) will be cleared. Recharging the battery will reset all settings 
to their initial factory defaults.

Power Recovery Mode
The watch is designed to go into a power recovery mode that stops hand operation 
temporarily whenever power suddenly drops below a certain level due to overuse 
of the alarm tone over a short period. Note that all operations are disabled while the 
watch is in the power recovery mode.
The hands will move to the correct positions and the watch will resume normal 
operation after power recovers (in about 15 minutes). Putting the watch in a location 
where it is exposed to light will help power to recover sooner.

Outdoor sunlight (50,000 lux)

8 minutes

2 hours

24 hours

Window sunlight (10,000 lux)

30 minutes

6 hours

90 hours

Window sunlight on cloudy day
(5,000 lux)

48 minutes

8 hours

– – –

Indoor fl uorescent lighting (500 lux)

8 hours

92 hours

– – –

*

*

 The above times are for reference only. Actual times depend on lighting conditions.

 

•

 For details about the operating time and daily operating conditions, see the “Power 

 

•

Supply” section of the Specifi cations.

Power Saving
Power Saving enters a sleep state automatically whenever the watch is left for a 
certain period in an area where it is dark. The table below shows how watch functions 
are affected by Power Saving.

 There actually are two sleep state levels: “second hand sleep” and “function sleep”.

 

•

60 to 70 minutes (second hand sleep)

x Second Hand only stopped at 12 o’clock, all 

other functions enabled

6 or 7 days (function sleep)

All functions, including analog timekeeping, 

  

•

disabled
Internal timekeeping maintained

  

•

 The watch will not enter a sleep state between 6:00 AM and 9:59 PM. If the watch 

 

•

is already in a sleep state when 6:00 AM arrives, however, it will remain in the sleep 
state.
 The watch will not enter a sleep state while it is in the Stopwatch Mode.

 

•

To recover from the sleep state
Move the watch to a well-lit area or press any button.

This watch receives a time calibration signal and updates its time setting accordingly. 
However, when using the watch outside of areas covered by time calibration signals, 
you will have to adjust the settings manually as required. See “Confi guring Current 
Time and Date Settings Manually” for more information.

This section explains how the watch updates its time settings when the city code 
selected as the Home City is in Japan, North America, Europe, or China, and is one 
that supports time calibration signal reception.

LON, PAR, ATH

Anthorn (England), Mainfl ingen (Germany)

HKG

Shangqiu City (China)

TYO

Fukushima (Japan), Fukuoka/Saga (Japan)

HNL, ANC, LAX, DEN, CHI, NYC

Fort Collins, Colorado (United States)

 The areas covered by 

 

•

HNL and ANC are quite far from the calibration signal 

transmitters, so certain conditions may cause reception problems.
 When 

 

•

HNL or HKG is selected as the Home City, only the time and date are 

adjusted according to the time calibration signal. You need to switch manually 
between standard time and daylight saving time (DST) if required. See “To toggle 
the Home City time between standard time and daylight saving time” for information 
about how to do this.

Moves at two-second 
intervals.

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