Manual Casio 5240 (page 3 of 9) (English)

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Operation Guide 5240

E-29

Radio-controlled Atomic Timekeeping Precautions

Strong electrostatic charge can result in the wrong time setting.

Even if a receive operation is successful, certain conditions can cause the time x

setting to be off by up to one second.

The watch is designed to update its day setting automatically for the period from x

January 1, 2000 to December 31, 2099. Updating of the day setting by signal

reception will no longer be performed starting from January 1, 2100.

If you are in an area where signal reception is not possible, the watch keeps time

with the precision noted in “Speciﬁ cations” (page E-82).

The receive operation is disabled under any of the following conditions. x

While power is at Level 2 or lower (page E-14) −

While the watch is in the power recovery mode (page E-15) −

While the watch is in the function sleep state (power saving, page E-17) −

While the watch is in the World Time Mode (page E-53) −

While a countdown timer operation is in progress (page E-63) −

A receive operation is cancelled if an alarm sounds while it is being performed. x

E-28

To turn auto receive on and off

In the Timekeeping Mode, press 1. B. The

Second

Hand will move to Y (YES) or N (NO) to indicate the last

calibration signal receive result.

Pull out the crown.2.

The

Second Hand will perform one full revolution and

then stop at the current on/off setting.

Rotate the crown to move the 3.

Second Hand to the

setting you want.

To turn on auto receive, select

x Y (YES).

To turn off auto receive, select x N (NO).

Push the crown back in to return to the Timekeeping 4.

Mode.



Y (YES)

N (NO)

E-27

Note

To interrupt a receive operation and return to the Timekeeping Mode, press any

button.

To check the result of the latest receive operation

In the Timekeeping Mode, press B. The

Second

Hand will move to Y (YES) or N (NO) to indicate the last

calibration signal receive result.

The

Second Hand will move to Y (YES) if the latest

receive operation was successful, or N (NO) if it was not.

After about 10 seconds, regular timekeeping will resume.

Press

x B to return to regular timekeeping. The watch will

also return to regular timekeeping if you do not perform

any operation for about 10 seconds.

Note

The

Second Hand will indicate N (NO) if you have adjusted the time or day

setting manually since the latest receive operation.



E-26

To perform manual receive

In the Timekeeping Mode (page E-33), keep 1. B depressed (for about two seconds)

as the

Second Hand goes through the following sequence.

Moves to x Y (YES) or N (NO) to indicate the last signal reception result, then to

R (READY).

The 2.

Second Hand indicates the operations the watch is currently performing.

When the x

Second Hand is

pointed here:

It means this:

R (READY)

Watch is setting up for reception.

W (WORK) Reception is in progress.

If signal reception is unstable, the x x

Second Hand may

move between W (WORK) and R (READY).

When the receive operation is successful, the watch

adjusts the time setting accordingly, and then resumes

regular timekeeping. It does not adjust the setting if the

operation failed.



E-25

What you should do next depends on whether you are using Auto Receive or 3.

Manual Receive.

Auto Receive: Leave the watch over night in the location you selected in step 2.

See “Auto Receive” on page E-25 for details.

Manual Receive: Perform the operation under “To perform manual receive” on

page E-26.

Auto Receive

With Auto Receive, the watch performs the receive operation each day

automatically up to six times (up to ﬁ ve times for the Chinese calibration signal)

between the hours of midnight and 5 a.m. (according to the Timekeeping Mode

time). When any receive operation is successful, none of the other receive

operations for that day are performed.

When a calibration time is reached, the watch will perform the receive operation

only if it is in the Timekeeping Mode. The receive operation is not performed if a

calibration time is reached while you are conﬁ guring settings.

E-24

Signal reception may be difﬁ cult or even impossible under the conditions x

described below.

Inside or

among

buildings

Inside a

vehicle

Near

household

appliances,

ofﬁ ce

equipment,

or a mobile

phone

Near a

construction

site, airport,

or other

sources of

electrical

noise

Near

high-tension

power lines

Among

or behind

mountains

E-23

To get ready for a receive operation

Conﬁ rm that the watch is in the Timekeeping Mode. If it isn’t, hold down 1. C for at

least two seconds to enter the Timekeeping Mode.

Place the watch in a location where signal reception is good.2.

12 o’clock

Position the watch as shown in the x

nearby illustration, with 12 o’clock

pointed towards a window. Make

sure there are no metal objects

nearby.

Signal reception normally is better

at night.

The receive operation takes from x

two to seven minutes, but in some

cases it can take as long as

14 minutes. Take care that you do

not perform any button operation or

move the watch during this time.

E-22

Signal reception may not be possible at the distances noted below during certain times x

of the year or day. Radio interference may also cause problems with reception.

Mainﬂ ingen (Germany) or Anthorn (England) transmitters: 500 kilometers

−

(310 miles)

Fort Collins (United States) transmitter: 600 miles (1,000 kilometers)

−

Fukushima or Fukuoka/Saga (Japan) transmitters: 500 kilometers (310 miles) −

Shangqiu (China) transmitter: 500 kilometers (310 miles) −

As of December 2010, China does not use Daylight Saving Time (DST). If China x

does go to the Daylight Saving Time system in the future, some functions of this

watch may no longer operate correctly.

Using this watch in a country covered by a time calibration signal that is different

from the countries it supports may result in incorrect time indication due to local

application of daylight saving time (summer time), etc.

E-21

Japanese Signals Chinese Signal

Fukushima

500 kilometers

1,000 kilometers

Fukuoka/Saga

1,500 kilometers

Changchun500 kilometers

Beijing

Shangqiu

Shanghai

Chengdu

Hong Kong

E-20

Approximate Reception Ranges

UK and German Signals North American Signal

Anthorn

500 kilometers

1,500 kilometers

Mainﬂ ingen

The Anthorn signal is receivable

within this area.

2,000 miles

(3,000 kilometers)

600 miles

(1,000 kilometers)

Fort Collins

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Casio 5240 Manual

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