CASIO F91W Manual

Reading the display

SU: Sunday, MO: Monday, TU: Tuesday, WE: Wednesday, TH: Thursday, FR: Friday, SA: Saturday (Changeover between 12-hour and 24-hour formats)
In regular timekeeping mode, with every push of , the display is switched between 12-hour and 24-hour formats.

Setting daily alarm

If the daily alarm is set, the buzzer sounds for 20 seconds at the preset time every day until cleared. To stop the buzzer, press the button. If the time signal is set, the watch sounds every hour on the hour.
(Sound demonstration) Press and hold the button in alarm mode to sound the buzzer.

[Hour setting]
Press in the daily alarm mode to set hour. One hour advances with every push of .

[Minute setting]
Press to set minute digits. One minute advances with every push of . Press to complete.*

*If the button is pressed, the watch reverts to the regular timekeeping mode. (Quick digit advance) When the button is pressed for more than 2 seconds, the digit advances quickly. When released, the digit advance will stop.

[On or off setting of daily alarm and time signal]

1. [The alarm-onmark and timesignal-on-mark appear.]
   The daily alarm and time signal sound.
   
2. [The alarm-onmark and timesignal-on-mark disappear.]
   The daily alarm and time signal do not sound.
   
3. [The alarm-on-mark only appears.]
   The daily alarm only sounds.
   
4. [The time-signalon-mark only appears.]
   The time signal only sounds.

Stopwatch operation

A signal confirms start/stop operation. (Working range) The stopwatch display is limited to 59 minutes 59.99 seconds, for longer times reset and start again.

Setting time and calendar

Setting sequence MUST BE FOLLOWED when making any new setting.

1. [Regular timekeeping]
   Press three times to change regular timekeeping mode to time/calendar setting mode.
   
2. [Second adjusting]
   Press to adjust seconds.*
   
3. [Hour setting]
   Press to move to the hour setting. Press to increase the number.
4. [Minute setting]
   Press to move to the minute setting. Press to increase the number.
5. [Month setting]
   Press to move to the month setting. Press to increase the number.
6. [Date setting]
   Press to move to the date setting. Press to increase the number.
7. [Day setting]
   Press to move to the day setting. Pressing advances to the next day. And press to complete.

*Precise time can be maintained by correcting the seconds once a month on a time signal from a radio, TV, telephone, etc.
(Quick digit advance) When the button is pressed for more than 2 seconds, the digit advances quickly. When released, the digit advance will stop.

• Correction of any digit, if not required, can be skipped by pressing the button repeatedly.
• 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 regular timekeeping mode automatically.

Specifications

Accuracy at normal temperature: ±30 seconds a month
Display capacity:

• Regular timekeeping mode Hour, minute, second, am/pm, date and day Calendar system: Auto-calendar set at 28 days for February
• Daily alarm mode
• Hourly time signal function
• Stopwatch mode
  Measuring capacity: 59 minutes 59.99 seconds
  Measuring unit: 1/100th of a second
  Measuring modes: Normal time, net time, split time and 1st-2nd place times

Battery:
One lithium battery (type: CR-2016 –– except Module 1271/BR-2020 –– Module 1271 only) Approx. 7 years operation on type CR-2016 (except Module 1271) /10 years on type BR- 2020 (Module 1271 only). [assuming alarm operation for 20 sec./day and one light operation for 1 sec./day]

NOTE:
THERE IS NO WAY unit components can be damaged or malfunction, due to misoperation of buttons. If confusing information appears on the display it means entry sequence was incorrect. Please read the manual and try again.

Documents / Resources

Download manual

Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.

Download CASIO F91W Manual