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Manual Casio Collection B640WB-1BEF Watch

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Manual

Operation Guide 3294

E-19

To set the countdown start time

In the Countdown Timer Mode, press 1. A. The hours digits of the countdown start

time will start to ﬂ ash, which indicates the setting screen.

Press 2. C to move the ﬂ ashing in the sequence shown below to select other

settings.

Hours Minutes Seconds

While a setting is ﬂ ashing, press 3. D to increase it.

To set the starting value of the countdown time to 24 hours, set x 0:00' 00.

Press 4. A to exit the setting screen.

E-18

Countdown Timer

The countdown timer can be set within a range of 1 second

to 24 hours. When the countdown reaches zero, an alarm

sounds for 10 seconds or until you press any button.

You can also select auto-repeat, which automatically

restarts the countdown from the original value you set

whenever zero is reached.

Countdown timer functions are available in the

Countdown Timer Mode, which you enter by pressing

C (page E-7).

Hours

Minutes

Seconds

Mode indicator

Current time

E-17

To switch an alarm and Hourly Time Signal on and off

Press D while in the Alarm Mode to change the status of

an alarm and Hourly Time Signal in the sequence shown

below.

Both off

Hourly Time Signal onlyBoth on

Alarm only

x The alarm on indicator and the Hourly Time Signal on

indicator are shown on the display in all modes while

these functions are turned on.

Hourly Time Signal

on indicator

Alarm on indicator

E-16

To set an alarm that does not include a day (Daily alarm, 1-Month alarm), set x

for the day. Press D until the

mark appears (between the end of the month

and

) while the day setting is ﬂ ashing.

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

correctly as a.m. or p.m. (PM indicator).

Press 4. A to exit the setting screen.

To stop the alarm

Press any button to stop the alarm after it starts to sound.

E-15

To set the alarm time

In the Alarm Mode, press 1. A. The hour digits of the alarm time will start to ﬂ ash,

which indicates the setting screen.



x This operation automatically turns on the alarm.

Press 2. C to move the ﬂ ashing in the sequence shown below to select other

settings.

Hour Minutes Month Day

While a setting is ﬂ ashing, press 3. D to increase it.

To set an alarm that does not include a month (Daily alarm, Monthly alarm), set x

for the month. Press D until the mark appears (between and ) while

month setting is ﬂ ashing.

E-14

Alarm Types

The alarm type is determined by the settings you make, as described below.

Daily alarm

Set the hour and minutes for the alarm time. This type of setting causes the alarm to

sound everyday at the time you set.

Date alarm

Set the month, day, hour and minutes for the alarm time. This type of setting causes

the alarm to sound at the speciﬁ c time, on the speciﬁ c date you set.

1-Month alarm

Set the month, hour and minutes for the alarm time. This type of setting causes the

alarm to sound everyday at the time you set, only during the month you set.

Monthly alarm

Set the day, hour and minutes for the alarm time. This type of setting causes the

alarm to sound every month at the time you set, on the day you set.

E-13

Alarm

The multi-function alarm lets you specify the hour,

minutes, month, and day for the alarm (page E-14). When

the alarm is on, the alarm sounds for 20 seconds at the

preset time. When the Hourly Time Signal is on, the

watch beeps every hour on the hour.

The alarm and the Hourly Time Signal sound in all

modes.

An alarm setting (and an Hourly Time Signal setting) x

is available in the Alarm Mode, which you enter by

pressing C (page E-6).

Hourly Time Signal

on indicator

Alarm on indicator

Mode indicator

Month

Hour

Minutes

Day

E-12

Backlight Precautions

The backlight uses an LED (light-emitting diode) and a light guide panel that cause

the entire display to glow for easy reading in the dark.

In any mode, press B to illuminate the display for about two seconds.



x The illumination provided by the backlight may be hard to see when viewed under

direct sunlight.



x The backlight automatically stops illuminating whenever an alarm sounds.

x Frequent use of the backlight shortens the battery life.

E-11

Backlight

When you switch the backlight function on, the backlight of the watch ﬂ ashes

whenever Alarm, Hourly Time Signal or Countdown Timer is sounding.



x Pressing B at any time illuminates the display, regardless of the backlight’s

on/off setting.

To switch the backlight function on and off

In the Timekeeping Mode, hold down D for about two

seconds to switch the backlight function on and off. When

you switch the backlight function on, an indicator appears

on the display as shown.



x The backlight function on indicator remains on the

display in all modes until you switch the backlight

function off.



x The above operation controls operation of the backlight

function only. It does not affect operation of audible

tones and signals.

Backlight function on

indicator

E-10

x The watch’s built-in full automatic calendar automatically makes allowances for

different month lengths and leap years. Once you set the date, there should be

no reason to change it except after you have the watch’s battery replaced.

With the 12-hour format, the

x PM indicator appears for times in the range of noon

to 11:59 p.m. and no indicator appears for times in the range of midnight to

11:59 a.m.

With the 24-hour format, times are displayed in the range of 0:00 to 23:59, with

the 24H indicator.

The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is x

applied in all other modes.

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Specifications

Brand	Casio
Model	Collection B640WB-1BEF
Category	Watches
File type	PDF
File size	0.15 MB

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Frequently Asked Questions about Casio Collection B640WB-1BEF Watch

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A battery in my device is oxidized, can I still safely use it? Verified

Ja, the device can still be safely used. Firstly, remove the oxidizd battery. Never use bare hands to do this. Then clean the battery compartment with a cotton swab dipped in vinegar or lemon juice. Let it dry and insert new batteries.

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My mechanical watch runs fast, what can I do? Verified

This might be caused by exposure to a magnetic field. It can be solved by a demagnetisation process performed by a professional watchmaker.

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What do AM and PM stand for? Verified

AM stands for Ante Meridiem and indicates that the time is before midday. PM stands for Post Meridiem and indicates that the time is past midday.

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What is a 'Chronograph'? Verified

A 'Chronograph' is literally a 'writer of time'. The term is used to describe clocks and watches that tell the time of day as well as measure a certain period of time, like a stopwatch.

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What is GMT? Verified

GMT stands for Greenwich Mean Time (sometimes called UTC, standing for Coordinated Universal Time). It is the time for the longitude 0, that passes through Greenwich near London.

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What is a quartz movement? Verified

Watches and clocks with a quartz movement are driven by a battery. This sends an electric current through quartz crystals that will vibrate. These vibrations are passed on to the movement. Because the vibrations have a fixed frequency, watches and clocks with a quartz movement are extremely precise.

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There is moisture on the inside of the glass of my Casio watch, what should I do? Verified

Casio states that if the moisture appeared after an extreme change in temperature and disappears relatively quickly afterwards, there is probably nothing wrong. If the moisture does not disappear, you should have your watch repaired as soon as possible.

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