Casio 668 Operation Manual

MA0905-EC
Operation Guide 668 2168 2505
About This Manual
General Guide
• • • • • Press B to change from mode to mode.
• • • • • Pressing B after performing some operations in any mode returns to the
Timekeeping Mode.
• • • • • If you do not perform any operation for a few minutes in the Alarm Mode or
Setting Screen, the watch automatically reverts to the Timekeeping Mode.
Timekeeping Mode
Timekeeping Mode
Minutes
Hour
Seconds
Day
Day of week
Charge indicator
PM indicator
Flashing
3. While the seconds setting is selected (flashing), press C to reset it to 00. If you
press C while the seconds setting is in the range of 30 to 59, the seconds are
reset to 00 and 1 is added to the minutes. If the seconds setting is in the range
of 00 to 29, the minutes count is unchanged.
4. While any other setting is selected (flashing), press C to increase the number.
• • • • • Holding down C changes the setting at high speed.
5. After you set the time and date, press B to return to the Timekeeping Mode.
Alarm Mode
Minutes
Hour
Mode indicator
Hourly time signal on indicator
Alarm on indicator
2. Press A to change the selection in the following sequence.
Daily Alarm and
Hourly Time Signal
on and off
3. Press C to increase the selected digits. Holding down C changes the number
at high speed.
• • • • • The format (12-hour and 24-hour) of the alarm time matches the format you
select for normal timekeeping.
• • • • • When setting the alarm time using the 12-hour format, take care to set the time
correctly as morning or afternoon.
To stop the alarm
• • • • • Press A to stop the alarm after it starts to sound.
• Button operations are indicated using the letters
shown in the illustration.
Alarm Mode
Press B.
In the Timekeeping Mode, press C to switch between
the 12-hour and 24-hour formats.
• • • • • When the 12-hour format is selected, the indicator PM
appears on the display to indicate "P.M." times. There
is no indicator for "A.M." times.
• • • • • When the 24-hour format is selected, the indicator
24H appears on the display.
• • • • • A charge indicator appears on the display of this
watch when charging is required.
To set the time and date
1. Press B three times in the Timekeeping Mode to
display the setting screen.
2. Press A to move the selection (flashing) in the
following sequence.
Seconds Hour
Day
Day of week
When the Daily Alarm is turned on, the alarm sounds for
20 seconds at the preset time each day. When the
Hourly Time Signal is turned on, the watch beeps every
hour on the hour.
To set the alarm time
1. Press A while in the Alarm Mode. The hour digits
flash because they are selected .
• • • • • At this time the alarm is automatically turned on.
Hour Minutes
Stopwatch Mode
To turn the Daily Alarm and Hourly Time Signal on and off
Press C while in the Alarm Mode to change the status of the Daily Alarm and
Hourly Time Signal in the sequence shown below.
Both ON
• • • • • The alarm and hourly time signal indicator is displayed in all modes.
To test the alarm
Hold down C while in the Alarm Mode to sound the alarm.
Stopwatch Mode
1/100 second
Seconds
Minutes
Minutes
Month
Mode indicator
Elapsed time measurement
Start
Split time measurement
Start
Split time and 1st-2nd place times
Start
Power Requirements
This watch works by light energy, so no battery is necessary. Light energy is
converted into electric energy by solar cells and stored into the capacitor. Once
fully charged, the watch can continue to run for a number of days (Modules 668
and 2168: 4 days, Module 2505: 14 days) without being exposed to light.
I Charging light
• • • • • The watch will start to work within about two seconds after it is exposed to light
(such as general office illumination). Set the time and calendar at this time.
• • • • • You can put on the watch after the "charge indicator (
display.
• • • • • The beeper sound may be weak and the display may be dim while the charge
indicator is on the display.
• • • • • Use the information in the table below as a reference how long you need to
expose the watch to light when charging it.
Setting Screen
Both OFF Daily Alarm
Only
The Stopwatch Mode lets you measure elapsed time,
split times, and two finishes. The range of the
stopwatch is 59 minutes, 59.99 seconds.
Stop Re-start Stop
Split Split release Stop
Split Stop Split release
First runner Second runner Display time of
finishes. finishes. second runner.
Display time of
first runner.
)" disappears from the
Hourly Time
Signal Only
Clear
Clear
Clear
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