Interval alarm doesn't work

click this link below for manual
http://ftp.casio.co.jp/pub/world_manual/wat/en/qw5081.pdf

here are instructions from diesel:

http://store.dieseltimeframes.com/wcsstore/CommonDiesel/instructions/ENGLISH/Diesel_Digital-Guide_ENG.pdf

more specifically


TIME OF DAY MODE
1. Press C to toggle between Time 1 and Time 2.
2. Hold C for two seconds to set Time 1 or 2 as default.
3. Press D to turn on/off key tone.
Time 1
> To set Time, press A until hour flashes. Press B to select the setting
item. Use C and D buttons to adjust the values up or down. Press A to
exit set mode.
Time 2
> To set Time, press A until hour flashes. Press B to select the setting
item. Use C and D buttons to adjust the values up or down. Press A to exit set mode.
> The range difference between Time 1 and Time 2 is 23 hours.
CHRONO MODE
1. Press C to start and stop chronograph.
2. Press D to Split/Reset the chronograph.
3. Press A to recall the memory if Chronograph is stopped.
4. Press A again to view the next lap.
5. Press C or D to exit Recall mode and go back to Chronograph mode.
6. There are a total of 10 lap memories.
TIMER MODE
1. There are 3 different modes of timer: Count Down-Stop, Count DownRepeat, Count Down-and Up.
2. Press C to start/stop the timer counting.
3. Press D to reset the counter to the preset value if timer is stopped.
4. Press and hold A for 2 seconds to enter Timer Setting Mode. 35 Timer Setting Mode


5. Press B to cycle around the setting item: timer-type, hour, minute,
second and to back timer-type again.
6. Press C and D to increase/decrease the setting value.
7. Press A to exit the setting mode.
TIMER ALARM
Timer alarm will beep 2 times a second for 30 seconds.
ALARM MODE
1. Press C to select the alarm.
2. Press D to enable/disable the alarm.
3. Press B to change to Time mode again.
ALARM SETTING MODE
1. Press and hold A for 2 seconds to enter the alarm settings mode.
2. Press C and D to increase or decrease the settings value.
3. Press A to exit the settings mode.

In time mode, hold set (bottom right button) to change date and time. The selected (flashing) item can be changed in one direction only using the up (top right) button. Press set again to cycle through each item until desired settings are chosen.
In stop watch mode, the up button starts and stops the stopwatch, the set button will take a split time while the time is running. To reset the stopwatch, press set once while the time is stopped.
In alarm mode, the up button turns the alarm on and off. There are three alarms available. To cycle though alarm times, press set. To set an alarm, press and hold set until the time flashes, then set the alarm time using the up button, cycle through hour and minutes using the set button. When finished, press set again.
Timer mode. To set the timer time, press and hold set until the time flashes. The timer goes up to 23h:59m:00s. You cannot set seconds. Once set, the timer can be started and stopped using the up button. There is no reset for the timer, to start a new timer the time must be manual changed again.
To check heart rate, press and hold mode until PUL is shown, place two fingers, one each on the top and bottom metal contacts for 6-10 seconds to get reading (This works best when not in motion).

If you changed battery yourself, you've lost the tiny spring without noticing it. Carefully check around the place where you changed the battery. The spring itself is very, very tiny, so, be as concentrated as much as you can. That spring (coilspring named by watchmakers) transmits the signal from watch movement to the watch back cover where the sound membrane is located. In case if you find it, open the watch and insert that spring with the bent out end first in to the desired hole in watch movement (should be named COIL SPRING). After that re-assemble watch and the sound should work.

The crown has 3 positions.

Normal screwed down.
First pull out position.
Second pull out position.

Setting the Time:
Pull out the crown to position 3.
Rotate the crown to set the exact time.
Ensure that you are in the daytime12 hour segment by allowing the hands to pass 12 o'clock and notice if the date moved on or not.
If the date changed, then you will need to advance at least 2 hours before moving on to set the date.
If you do not need to change the date, return the crown to position 1.


Setting the Date:
DO NOT DO THIS IF THE WATCH IS BETWEEN 8pm & 2am
Pull crown to position 2.
Rotate the crown clockwise to set to the correct date.
Return the crown to position 1.


Setting the Alarm [12 hour]
Pull the crown to position 2.
Rotate the crown anti clockwise to move the alarm hand to the desired time.
Return the crown to position 1.
To activate the alarm, press the 8 o'clock button. You will hear 2 beeps.
To deactivate the alarm, press the 8 o'clock button. You will hear 1 beep.
NB If the alarm is not cancelled while it sounds the first time, it will repeat again in 2 minutes time. The alarm sound last for 15 seconds. If the alarm time coincides with 1 beep of the countdown, the alarm function will be cancelled.


Battery EOL [End Of Life]
The Swiss ISA 8270 movement uses a 395 cell and will signify a low power state by advancing the small seconds hand 4 steps every 4 seconds.


Setting the Countdown
You can specify a countdown of between 1 and 10 minutes.
Press the 4 o'clock button to enter setting mode. You will hear 1 beep.
Press the 4 o'clock button to move the central timing hand successively to the desired countdown time.
Wait 3 seconds for the watch to automatically exit the setting mode.
You can change the duration of the countdown [except in the last minute] at any time.
e.g. If the countdown is set to 10minutes, and you now want to change the countdown to 9 minutes, press the 4 o'clock button. The hours/seconds counter sub-dial will perform one complete turn and then stop at 60, before continuing.


Activating the Countdown:
Press the 2 o'clock button to start the countdown. You will hear 2 beeps.
The hours/seconds counter sub-dial will perform one complete turn and then stop at 60, before continuing.
When the countdown begins, the hour/seconds counter sub-dial indicates the seconds with 1 step every 2 seconds, and the central timing hand indicates the minutes with 1 step being 2.4 seconds.


Countdown tone:
There are 2 beeps every minute.
in the last minute:
50 seconds=1 beep.
40 seconds=1 beep.
30 seconds=2 beeps.
20 seconds=2 beeps.
10 seconds and less=1 beep every second with zero being 1 second long beep. Timer function automatically starts.


Timer:
After countdown has finished the timer starts automatically.
The central timing hand indicates the minutes with 1 step every 12 seconds. The hour/minutes counter sub-dial indicates the hours up to a maximum of 96.
Press the 4 o'clock button to see the timer seconds [display lasts up to a minute].
Press the 4 o'clock button to see the timer hours.
The timer has a maximum time of 96 hours [4 days] after which the hour/seconds sub-dial counter will stay at 0 and the central timing hand will stay at 12.


Start/Stop Timer:
Press the 2 o'clock button to stop the timer. You will hear 1 beep.
Press the 2 o'clock button to resume the timer. You will hear 2 beeps.


Setting the Countdown & Timer:
Countdown reset:
Press the 2 o'clock button to stop the countdown. You will hear 1 beep.
Press the 4 o'clock button to reset.


Setting the Timer:
Press the 2 o'clock button to stop the timer. The hour/seconds counter sub-dial will show the elapsed hours and the central timing hand the elapsed minutes.
Press the 4 o'clock button to view the seconds elapsed on the hour/seconds counter sub-dial.
Press the 4 o'clock button to reset.


Resetting the Hands:
If the hands do not zero correctly, which might occur after a battery change or a violent shock, you can make adjustments by doing the following settings as long as the countdown is not in operation.
To correct the hour/seconds counter sub-dial, pull the crown out to position 2 and wait 1 second.
Press either the 2 or 4 o'clock button; the central timing hand will turn and stop [not necessarily at 12].
Press the 2 o'clock button to increment the hours/seconds counter sub-dial hand to position it at 60.
To correct the central timing hand, press the 4 o'clock button to increment the hand to the 12 position.
Return the crown to position 1.



If the battery had been replaced, the central timing hand defaults to the 10 minute position. If the battery had not been replaced, the central timing hand will return to the previously set position.

Thanks for contacting us at FixYa. Yup, its the battery. Good call. Best regards.

BUY ONE ONLINE

I just bought a Sportline 241 last week. The instructions are as follows. Note that there are no instructions for setting the 12/24 hour time option. Mine is in 24 hour mode (which is what I wanted), but I do not recall if it arrived that way or if I stumbled onto this mode when setting the time/date or alarm functions.

I hope this helps.


SPORTLINE 241 WALKING ADVANTAGE KEYCHAIN STOPWATCH

FEATURES:
24 hour stopwatch
Time-of-day and calendar
Alarm clock
12/24 hour time option

BATTERY:
Replace with LR41 battery

TO SET TIME AND CALENDAR:
From normal time display, press MODE button three times to enter Set Time/Date Mode. Seconds is automatically selected.
Press SPLIT/RESET button to cycle through minutes, hours, day, month, day of week, seconds.
Press START/STOP SET button to change digits on any of the above (seconds only: resets to 00).
Press and hold START/STOP SET button to advance digits rapidly.
Press MODE button once to return to normal time display.
From normal time display, press and hold START/STOP SET button to see the month, day, and day-of-week.

TO SET ALARM:
From normal time display, press MODE button twice to enter Set Alarm Mode. Hours is automatically selected.
Press SPLIT/RESET button to cycle through minutes and hours.
Press START/STOP SET button to change digits.
Press and hold START/STOP SET button to advance digits rapidly.
Press MODE button to return to normal time display.
From normal time display, press and hold SPLIT/RESET button to see the alarm time setting.

TO ARM/DISARM ALARM SOUND:
From normal time display, press and hold SPLIT/RESET button, then repeatedly press START/STOP SET button to arm/disarm alarm sound.
Alarm will sound when indicator shows in upper right corner.
Release SPLIT/RESET button to return to normal time display.

TO ARM/DISARM HOURLY CHIME SOUND:
From normal time display, press and hold SPLIT/RESET button, then repeatedly press MODE button to arm/disarm hourly chime sound.
Chime will sound when dashes appear along top of display.
Release SPLIT/RESET button to return to normal time display.


STOPWATCH OPERATION - GENERAL:
From normal time display, press MODE button once to reach stopwatch timer display.
After use of any stopwatch feature, press MODE button once to return to normal time display.

START-STOP (TIME-IN/TIME-OUT) TIMING:
With stopwatch timer on display, repeatedly press START/STOP SET button to start or stop the timer. When timer is stopped, press SPLIT/RESET button to reset timer to 0.

SPLIT TIMING:
With stopwatch timer on display, start the timer with START/STOP SET button. Repeatedly press SPLIT/RESET button to split or release the timer. Press START/STOP SET button to stop the timer. Press SPLIT/RESET button to reset timer to 0.

1-2 FAST FINISH:
With stopwatch timer on display, start the timer with START/STOP SET button.
Press SPLIT/RESET button for STOP #1.
Press START/STOP SET button for STOP #2. The stop time for #1 will now be shown.
Press SPLIT/RESET button. The stop time for #2 will now be shown.
Press SPLIT/RESET button to reset the timer to 0.

1) You have lost the connector spring wich transmits the sound signal to the tweeter positioned inside back cover. In this case you have to look for watchmakers help.
2) You may misplaced the gasket in watch and the spring is not touching the caseback through the protrusion. In this case open the caseback, realign the gasket properly and reassemble the watch. Make sur thet the spring is touching the caseback inside watch.
Do not forget to rate, please.