Watch Catalog

Casio module 3487

Quartz module. 3487 is the number engraved on the caseback of these watches, and Casio files its operation manual under it. 1 watch in the catalog runs on it.

How to operate module 3487

Short steps in our words. The buttons are lettered as in Casio's operation guide, where each task's page is given.

Set the time and date

  1. In the Timekeeping Mode, hold A until the seconds flash.
  2. Press C to step through the settings: seconds, hour, minutes, year, month, then day.
  3. On the seconds, press D to reset them to 00.
  4. On any other setting, press D to count up (hold for fast).
  5. Press A to leave the setting screen.
  6. To switch between 12-hour and 24-hour format, press D in the Timekeeping Mode.

Good to know

Resetting the seconds between 30 and 59 adds one minute.

In 12-hour format, P marks p.m. The format applies in all modes.

The day of the week follows the date by itself. The year runs from 2000 to 2099.

From Casio's guide, page E-6

Set an alarm

  1. Press C until the Alarm Mode shows (the mode right after the Timekeeping Mode).
  2. Press D until the alarm you want shows: 1 to 5, or :00 for the hourly signal. Alarm 1 has snooze.
  3. Hold A until the hour flashes; this also switches the alarm on.
  4. Press C to step through hour, minutes, month and day; press D to count up (hold for fast).
  5. For an alarm every day, set the month to - and the day to - -; set only the day for every month on that day, only the month for every day of that month, or both for one date.
  6. Press A to leave the setting screen.
  7. To switch alarm 2 to 5 or the hourly signal on or off, select it with D and press A.
  8. For alarm 1, select it and press A to step through alarm on, snooze alarm on (SNZ shows), then off.

Good to know

In 12-hour format, mind a.m. or p.m.: P marks p.m.

An alarm sounds for 10 seconds in any mode; press any button to stop it. The snooze alarm sounds up to seven times, every five minutes, until you switch it off.

In the Alarm Mode, hold D to test the sound.

From Casio's guide, page E-11

Light

  1. Press B in any mode to light the display for about one second.

Good to know

The light goes off when an alarm sounds.

Frequent use of the light shortens the battery life.

From Casio's guide, page E-22

Stopwatch

  1. Press C until the Stopwatch Mode shows (after the Countdown Timer Mode).
  2. Press D to start, D to stop, and D again to carry on.
  3. When it is stopped, press A to reset it to zero.
  4. For a split time, press A while it runs (SPL shows); press A again to let the display catch up.

Good to know

It counts up to 23 hours 59 minutes 59.99 seconds, then starts again from zero until you stop it; it keeps running in other modes.

From Casio's guide, page E-20

Countdown timer

  1. Press C until the Countdown Timer Mode shows (after the Alarm Mode).
  2. Hold A until the hours flash.
  3. Press C to move between the hours and the minutes; press D to count up (hold for fast).
  4. Press B to switch auto-repeat on or off while the setting screen shows.
  5. Press A to leave the setting screen.
  6. Press D to start, D to pause, D to carry on; to stop it fully, pause it and press A to reset it to the start time.

Good to know

The start time is one minute to 24 hours; set 0:00 for 24 hours.

At zero the alarm sounds for 10 seconds; press any button to stop it. With auto-repeat on, the countdown starts again by itself.

Pressing B for auto-repeat also turns on the light.

From Casio's guide, page E-17

Module 3487 specs

Type
quartz
Power
Approx. battery life: 10 years on CR2025 · other watches that take CR2025
Accuracy
±30 seconds per month
Functions
World time, Stopwatch, Timer, Alarm/hourly time signal, Light, Light color, Calendar, 12/24-hour format
Manual
Casio's operation guide for module 3487

Watches with the 3487