Casio 5091 Owner's Manual
MA0905-EA
Operation Guide 5091
About This Manual
•Button operations are indicated using the letters shown in the illustration.
•Each section of this manual provides you with the
information you need to perform operations in each mode. Further details and technical information can be found in the “Reference” section.
General Guide
• Press Cto change from mode to mode.
Timekeeping Mode |
Calendar Mode |
Alarm Mode |
Dual Time Mode |
Stopwatch Mode |
Press 
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Timekeeping
Use this mode to set the current time. An incorrect digital time setting will cause incorrect operation of the calendar.
To set the digital time
Hour hand |
Minute hand |
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Hold down . |
Press . |
Press . |
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Seconds |
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Hour |
PM |
12/24 |
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Minutes |
indicator |
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Press . |
Press . |
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Hour |
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Seconds |
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Minutes
1.In the Timekeeping Mode, hold down Buntil the seconds digits start to flash, which indicates the setting screen.
2.Press Cto reset the seconds to 00.
3.Press Bto move the selection to the hour digits.
4.Press Cto increase the hour digits.
5.Press Bto move the selection to the minutes digits.
6.Press Cto increase the minutes digits.
7.Press Bto move the selection to 12/24.
8.Press Cto toggle the timekeeping format between 12-hour and 24-hour.
9.Press Bto exit the setting screen.
•Resetting the seconds to 00 while the current count is in the range of 30 to 59 causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are reset to 00 without changing the minutes.
•With the 12-hour format, the P (PM) indicator appears on the display 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, without any indicator.
To set the hands
In any mode, press A with a thin object to advance the analog time setting. Each press of Aadvances the time by 20 seconds. Three presses advance by one minute. Holding down Aadvances the analog setting at high speed. You can only advance the setting. You cannot reverse it.
Calendar
Use this mode to set today’s date (month, day, day of the week).
To set the date
Hold down . |
Press . |
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Press . |
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Month |
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Day |
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Day of week |
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Press .
Month |
Day of week |
Day
1.In the Calendar Mode, hold down B until the month digits start to flash, which indicates the setting screen.
2.Press Cto increase the month digits.
3.Press Bto move the selection to the day digits.
4.Press Cto increase the day digits.
5.Press Bto move the selection to the day of the week.
6.Press Cto advance to the next day.
7.Press Bto exit the setting screen.
•The watch does not make any allowance for leap years. Be sure to manually set February 29 when one occurs during a leap year.
Alarm
When the Daily Alarm is turned on, an 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.
•You can configure alarm settings and Hourly Time Signal settings in the Alarm Mode, which you enter by pressing C.
To set the alarm time and to turn the Daily Alarm and Hourly Time Signal on and off
Alarm on indicator
Mode indicator
Hold down |
Press |
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Press |
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. |
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. |
Left |
. |
Right |
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Hour |
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minutes |
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minutes |
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digit |
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digit |
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Press . |
Alarm/Hourly Time Signal setting |
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Press . |
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Hour
Hourly time
Minutes signal on indicator
1.In the Alarm Mode, hold down B until the hour digits start to flash, which indicates the setting screen.
2.Press Cto increase the hour digits.
•The 12/24-hour format of the alarm time matches the format you select for normal timekeeping.
3.Press Bto move the selection to the left minutes digit.
4.Press Cto increase the left minutes digit.
5.Press Bto move the selection to the right minutes digit.
6.Press Cto increase the right minutes digit.
7.Press Bto move to the Daily Alarm and Hourly Time Signal on and off setting.
8.Press Cto cycle through the Daily Alarm and Hourly Time Signal settings as shown in the sequence below.
•At this time Daily Alarm and Hourly Time Signal automatically turn on.
Press |
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Press |
Press |
. |
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. |
Both ON |
Both OFF |
Daily Alarm |
Hourly Time |
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only |
Signal only |
Press 
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9. Press Bto exit the setting screen.
To stop the alarm
Press any button to stop the alarm after it starts to sound.
To test the alarm and select an alarm tone
Hold down C in any mode (except when making any settings) to sound the alarm. Note that the alarm sound changes each time you hold down Cto test the alarm. There are a total of four different alarm sounds. The last alarm sound you hear when performing the above test is the one that is used for the Daily Alarm and the Hourly Time Signal.
• Note that holding down Calso changes the mode.
1
Operation Guide 5091
Dual Time
The Dual Time Mode lets you keep track of time in a different time zone.
•In the Dual Time Mode, the seconds count is synchronized with the seconds count of the Timekeeping Mode digital time.
To set the Dual Time
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Hold down . |
Press |
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Press . |
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Hour |
Minutes |
12/24 |
Mode |
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Press . |
indicator |
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Hour |
Seconds |
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Minutes |
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1.In the Dual Time Mode, hold down Buntil the hour digits start to flash, which indicates the setting screen.
2.Press Cto increase the hour digits.
3.Press Bto move the selection to the minutes digits.
4.Press Cto increase the minutes digits.
5.Press Bto move the selection to 12/24.
6.Press Cto toggle the timekeeping format between 12-hour and 24-hour.
7.Press Bto exit the setting screen.
•With the 12-hour format, the P (PM) indicator appears on the display 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, without any indicator.
Stopwatch
Mode indicator
Minutes 1/100
second
Seconds
The Stopwatch Mode lets you measure elapsed time. The range of the stopwatch is 59 minutes, 59.99 seconds.
•The stopwatch continues to run, restarting from zero after it reaches its limit, until you stop it.
•The stopwatch measurement operation continues even if you exit the Stopwatch Mode.
To use the Stopwatch
1.In the Stopwatch Mode, press B to start the stopwatch.
2.Press Bto stop the time measurement.
•You can press Bas many times as you want to resume and stop timing.
3.After you are finished using the stopwatch, hold down Bto clear the stopwatch time to all zeros.
Reference
This section contains more detailed and technical information about watch operation. It also contains important precautions and notes about the various features and functions of this watch.
Auto return features
If you leave a screen with flashing digits for one or two minutes without performing any operation, the watch automatically saves any settings you have made up to that point and exits the setting screen.
Scrolling
The C button is used to scroll through setting screen data on the display. Holding down this button during a scroll operation scrolls through the data at high speed.
Specifications
Accuracy at normal temperature: ±30 seconds a month
Timekeeping: Hour, minutes, seconds
Time format: Switchable between 12-hour and 24-hour formats
Calendar: Month, day, day of week
Calendar system: Auto-calendar set at 28 days for February Alarm: Daily Alarm, Hourly Time Signal
Dual Time: Hour, minutes, seconds
Time format: Switchable between 12-hour and 24-hour formats
Stopwatch
Measuring capacity: 59 minutes 59.99 seconds Measuring unit: 1/100 of a second
Measuring modes: Elapsed time
Other: 2 analog hands: hour, minutes (hand moves every 20 seconds)
Battery: One silver oxide battery (Type: SR920W)
Battery life: Approximately 2 years under the following condition
• 20 seconds alarm operation per day
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