Manual Casio 3749 (page 2 of 5) (English)

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Operation Guide 2734 58 3748 9

About Auto Receive

When auto receive is turned on, the watch automatically starts to receive the time

calibration signal when the digital time in the Timekeeping Mode reaches 0:00 a.m.,

1:00 a.m., 2:00 a.m., 3:00 a.m., and 4:00 a.m. each day (calibration times). The watch

will also perform an additional auto receive operation at 5:00 a.m. if none of regularly

scheduled auto receive operations are successful.

Note

• The auto receive operation is performed only if the watch is in the Timekeeping

Mode or World Time Mode when one of the calibration times is reached. It is not

performed if a calibration time is reached while an alarm is sounding, or while you

are configuring settings (while settings are flashing on the display).

• Auto receipt of the calibration signal is designed to be performed early in the

morning, while you sleep (provided that the Timekeeping Mode time is set

correctly). Before going to bed for the night, remove the watch from your wrist, and

put it in a location where it can easily receive the signal.

• When auto receive is turned on, the watch receives the calibration signal for two to

five minutes everyday when the digital time in the Timekeeping Mode reaches

each of the calibration times. Do not perform any button operation within five

minutes before or after any one of the calibration times. Doing so can interfere with

correct calibration.

• Remember that reception of the calibration signal depends on the time kept in the

digital display. The receive operation will be performed whenever the display

shows any one of the calibration times, regardless of whether or not the displayed

time is actually the correct time.

• When two, three, four, or five receptions are successful, the watch uses the data of

the last reception for calibration. When only one reception is successful, the watch

uses the data of the successful reception.

Receiving indicator

Weak

Strong

(Level 1)

(Level 4)

About the Receiving Indicator

The receiving indicator shows the strength of the calibration signal being received.

For best reception, be sure to keep the watch in a location where signal strength is

strongest.

• Even in an area where signal strength is strong, it takes about 10 seconds for

signal reception to stabilize enough for the receiving indicator to indicate signal

strength.

• Use the receiving indicator as a guide for checking signal strength and for finding

the best location for the watch during signal receive operations.

• The Level 4 receiving indicator remains on the display in all modes following

reception of the time calibration signal and calibration of the watch’s time setting.

The Level 4 receiving indicator is not displayed if signal reception was

unsuccessful or after manual adjustment of the current time setting.

• The Level 4 receiving indicator is displayed only when the watch is able to

successfully receive both time and date data. It does not appear when only time

data is received.

• The Level 4 receiving indicator indicates that at least one of the calibration signal

receive operations was successful. Note, however, that the Level 4 receiving

indicator is cleared from the display at 3:00 a.m. each day.

To perform manual receive

1. Place the watch on a stable surface so its top (12

o’clock side) is facing towards a window.

• Note that signal reception is poor when the 12

o’clock side of the watch is not facing towards a

window.

2. In the Timekeeping Mode, hold down D for about two

seconds until the watch beeps.

Receiving indicator

3. Release D and the current time flashes to indicate that signal reception has

started.

• Time calibration signal reception takes from two to five minutes. Take care that you

do not perform any button operations or move the watch during this time.

• After signal reception is complete, the display of the watch changes to the Last

Signal screen.

Note

• To interrupt a receive operation and return to the Timekeeping Mode, press D.

• If the receive operation is unsuccessful, the message

ERR appears on the display

for about one or two minutes. After that, the watch returns to the Timekeeping

Mode.

• You can also change from the Last Signal or

ERR screen to the normal

timekeeping screen by pressing D.

To turn auto receive on and off

1. In the Timekeeping Mode, hold down A until the

transmitter indicator starts to flash, which indicates the

setting screen.

2. Press C three times to move the flashing to the auto

receive on/off setting.

3. Press D to toggle auto receive on (ON) and off (OF).

• If the current Home City setting is a city code that

does not support signal receive, “xx” appears in

place of the on/off indicator. This means you cannot

turn auto receive on or off.

4. Press A twice to exit the setting screen.

On/off status

To display the digital time and Last Signal screen

• In the Timekeeping Mode, press A to cycle through the digital time screens as

shown below.

• In the Timekeeping Mode, press D to display the Last Signal screen (indicated by

GET). The Last Signal screen shows the date and time of the last successful time

calibration signal reception.

▲

Press D.

Seconds

Last Signal Screen

Receive date

Receive time

Alternate at two-

second interval

Day of week

Hour : Minutes Seconds Month — Day

▲

Press A.

▲

Month — Day

▲

Signal Receive Troubleshooting

Check the following points whenever you experience problems with calibration

signal reception.

Problem

Cannot perform

manual receive.

Auto receive is

turned on, but

the Level 4

receiving

indicator does

not appear on

the display.

Time setting is

incorrect

following signal

reception.

Probable Cause

•

The watch is not in the Timekeeping Mode.

• Your current Home City is not one of the

following city codes:

BER, PAR , or LON.

• The transmitter setting is incorrect.

• You changed the time setting manually.

• The watch was not in the Timekeeping

or World Time Mode, or you performed

some button operation during the auto

receive operation.

•

Even if receive is successful, the Level 4

receiving indicator disappears every day

at 3 am.

• Time data (hour, minutes, seconds) only

was received during the last receive

operation. The Level 4 receiving

indicator appears only when time data

and date data (year, month, day) are

both received.

• If the time is one hour off, the DST

setting may be incorrect.

• The Home City code setting is not

correct for the area where you are using

the watch.

What you should do

• Enter the Timekeeping Mode

and try again.

• Select BER, PAR, or LON as

your Home City.

• Select the transmitter setting

appropriate for your current

location.

• Select the transmitter setting

appropriate for your current

location.

• Perform manual signal receive

or wait until the next auto

signal receive operation is

performed.

• Check to make sure the watch

is in a location where it can

receive the signal.

• Change the DST setting to

Auto DST.

• Select the correct Home City

code.

• For further information, see “Important!” under “Time Calibration Signal Reception”

and “Radio-controlled Timekeeping Precautions”.

World Time

The World Time shows the current time in 30 cities (29

time zones) around the world.

• If the current time shown for a city is wrong, check your

Home City time settings and make the necessary

changes.

• The watch will perform a signal receive operation even

if it is in the World Time Mode when a calibration time is

reached. If this happens, the World Time Mode time

settings will be adjusted in accordance with the

Timekeeping Mode’s Home City time.

• All of the operations in this section are performed in the

World Time Mode, which you enter by pressing C.

City Code

Current time in the

selected city code

To view the time in another city

While in the World Time Mode, press D to scroll through the city codes (time zones).

• For full information on city codes, see the “City Code Table”.

To toggle a city code time between Standard Time and Daylight Saving Time

1. In the World Time Mode, use D to display the city

code (time zone) whose Standard Time/Daylight

Saving Time setting you want to change.

2. Hold down A to toggle Daylight Saving Time (DST

displayed) and Standard Time (DST not displayed).

• Note that you cannot use the World Time Mode to

change the DST setting of the Home City code you

currently have selected in the Timekeeping Mode. See

“To change the Daylight Saving Time (summer time)

setting” for information about turning the Home City

code DST setting on and off.

DST indicator

• The DST indicator is on the display whenever you display a city code for which

Daylight Saving Time is turned on.

• Note that the DST/Standard Time setting affects only the currently displayed city

code. Other city codes are not affected.

Alarms

The Alarm Mode gives you a choice of four one-time

alarms and one snooze alarm. One of the one-time

alarms functions as a “target alarm,” which counts the

time remaining from the current Home City time to the

target alarm time.

Also use the Alarm Mode to turn the Hourly Time Signal

on and off.

• There are five alarms named

AL1, AL2, AL3, TAL

(target alarm), and SNZ. You can configure SNZ as

a snooze alarm only. Alarms

AL1, AL2, AL3, and

TAL can be used as one-time alarms only.

• Alarm settings (and Hourly Time Signal settings) are

available in the Alarm Mode, which you enter by

pressing C.

Alarm time

(Hour : Minutes)

Alarm name

Hourly Time

Signal Screen

To set an alarm time

1. In the Alarm Mode, use D to scroll through the alarm

screens until the one whose time you want to set is

displayed.

2. After you select an alarm, hold down A until the hour setting of the alarm time

starts to flash, which indicates the setting screen.

• This operation automatically turns on the alarm.

3. Use C to move the flashing between the hour and minute settings.

4. While a setting is flashing, use D (+) and B (–) to change it.

• When setting the alarm time using the 12-hour format, take care to set the time

correctly as a.m. (no indicator) or p.m. (P indicator).

AL1 AL2 AL3

SIG SNZ TAL

I am unable to get the correct DAY on my Casio model 3749 ? I have used the manual but cannot find the answer ? Submitted on 3-1-2023 at 12:08
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