Casio 1627 Owner's Manual
Module No.1627/2023
• Press C to change from mode to mode.
GENERAL GUIDE
• In the Timekeeping Mode and Alarm Mode, press D to illuminate the display for about two seconds. In the Countdown Alarm Mode and Stopwatch Mode, press E to illuminate the
display. The watch can be set so that the backlight flashes whenever an alarm sounds.
[Module 2023]
The operational procedures for Module 1627 and 2023 are identical. All of the illustrations in this manual show Module 1627.
Timekeeping Mode
[Module 1627]
TIMEKEEPING MODE
Graphic display
Day of the week
Month
Hour Seconds
Minutes
PM indicator
3.While the seconds digits are selected (flashing), press E to reset the seconds to
“00”. If you press E while the seconds count is in the range of 30 to 59, the
seconds are reset to “00” and 1 is added to the minutes. If the seconds count is in
the range of 00 to 29, the minutes count is unchanged.
4. While any other digits (besides seconds) are selected (flashing), press E to in-
crease the number or B to decrease it. Holding down either button changes the
current selection at high speed.
5.After you set the time and date, press A to return to the Timekeeping Mode.
• The day of the week is automatically set in accordance with the date.
• The date can be set within the range of January 1, 1995 to December 31, 2039.
• If you do not operate any button for a few minutes while a selection is flashing, the
flashing stops and the watch goes back to the Timekeeping Mode automatically.
About the backlight
• The backlight of this watch employs an electro-luminescent (EL) light, which loses
its illuminating power after very long term use.
To turn the EL Alarm feature on and off
• In the Timekeeping Mode, hold down E until the EL Alarm indicator appears on (EL
alarm on) or disappears from (EL alarm off) the display.
• The EL Alarm indicator remains on the display in all modes.
• The above operation controls operation of the EL Alarm only. It does not affect
operation of audible tones and signals.
• Pressing D (Timekeeping Mode, Alarm Mode) or E (Countdown Alarm Mode, Stop-
watch Mode) illuminates the display for about two seconds, regardless of the EL
Alarm’s on/off setting.
• The watch will emit an audible sound whenever the display is illuminated. It does
not indicate malfunction of the watch.
This watch is equipped with a backlight that can be set to
flash whenever an alarm sounds.
• In the Timekeeping Mode, press B to switch between
Day
the 12-hour and 24-hour formats.
• In the Timekeeping Mode, the Graphic Display indicates
the counting of seconds.
To set the time and date
1.Press A while in the Timekeeping Mode. The seconds
digits flash on the display because they are
2.Press C to change the selection in the following se-
quence.
ON
Seconds
Day
EL Alarm
indicator
Hour
Month
OFF
Minutes
Year
selected
.
COUNTDOWN ALARM MODE
Mode indicator
Current time
Minutes
Seconds
1/10 second
3. Stop the countdown alarm and then press B to reset the countdown alarm to its
starting value.
• The countdown alarm is automatically reset to its starting value after the alarm
stops.
About countdown indicators
An audible beep and the EL backlight keep you informed about the progress of the
countdown as noted in the following table.
Remaining
Start (pressing D)
5' 00"
4' 00"~1' 00"
Time up (00' 00")
The countdown alarm can be set within a range of 1 minute
to 60 minutes. When the countdown reaches zero, an alarm
sounds for 10 seconds or until you press any button.
To set the countdown start time
Press B to increase the selected number. Holding down
B changes the selection at high speed.
To use the countdown alarm
1.Press D while in the Countdown Alarm Mode to start
the countdown alarm.
2.Press D again to stop the countdown alarm.
• You can continue countdown alarm operation by pressing D.
Audible beep
1 second
1 second
1 second
10 seconds 10 seconds
EL Backlight
1 second
1 second
—
Countdown Alarm
Mode
Stopwatch Mode Alarm Mode
STOPWATCH MODE
Mode indicator
Hours
Minutes
Seconds
1/100 second
To record split times
1.Press D to start the stopwatch.
2.Press B to display the timing up to that point. Stopwatch timing continues internally.
3.Press B to clear the split time and to continue time measurement on the display.
• You can repeat steps 2 and 3 as many times as you want.
4.Press D to stop the time measurement.
5.Press B to clear the stopwatch to all zeros.
To time first and second place finishes
1.Press D to start the stopwatch.
2.Press B when the first finisher crosses the line, and record the time.
3.Press D when the second finisher crosses the line.
4.Press B to display the finishing time of the second finisher.
5.Press B again to clear the stopwatch to all zeros.
The Stopwatch Mode lets you measure elapsed time, split
times, and two finishes. The range of the stopwatch is 23
hours, 59 minutes, 59.99 seconds.
To measure elapsed time
1.Press D to start the stopwatch.
2.Press D to stop the stopwatch.
• You can resume the measurement operation by pressing D again.
3.Press B to clear the stopwatch to all zeros (0H
00'00"00).
ALARM MODE
Hourly time signal
on indicator
Mode indicator
Current time
Minutes
Hour
Alarm on indicator
2.Press C to change the selection in the following sequence.
3.Press E to increase the selected digits and B to decrease them. Holding down
either button changes the selection 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 (P) .
4.After you set the alarm time, press A to return to the Alarm Mode.
To switch the Daily Alarm and Hourly Time Signal on and off
Press E while in the Alarm Mode to change the status of the Daily Alarm and Hourly
Time Signal in the following sequence.
[Alarm ON Indicator/Hourly Time Signal ON Indicator]
Both ON
To test the alarm
Hold down B while in the Alarm Mode to sound the alarm.
When the Daily Alarm is switched on, the alarm sounds
for 20 seconds at the preset time each day. Press any
button to stop the alarm after it starts to sound.
When the Hourly Time Signal is switched 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
on the display because they are
• At this time the Daily Alarm is switched on automati-
cally.
Hour
Both OFF Daily Alarm
only
Minutes
selected
Hourly Time
Signal only
.
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