Watch Catalog

Casio module 3531

Quartz module. 3531 is the number engraved on the caseback of these watches, and Casio files its operation manual under it. 4 watches in the catalog run on it.

How to operate module 3531

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 for at least one second, until the seconds flash.
  2. Press C to step through the settings: seconds, summer time, Home City, hours, minutes, year, month, then day.
  3. On the seconds, press D to reset them to 00.
  4. On any other setting, press D or B to change it (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.

The watch leaves the setting screen by itself after about two or three minutes without a button press.

From Casio's guide, page 7

Daylight saving time

  1. In the Timekeeping Mode, hold A for at least one second, until the seconds flash.
  2. Press C once to reach the summer time setting.
  3. Press D to switch between On (summer time) and OF (standard time).
  4. Press A to leave. The DST indicator shows while summer time is on.

Good to know

For the World Time city, summer time is set separately: in the World Time Mode, hold A for at least one second to toggle it.

From Casio's guide, page 6

Home City

  1. In the Timekeeping Mode, hold A for at least one second, until the seconds flash.
  2. Press C twice to reach the Home City setting.
  3. Press D or B to scroll through the city codes (hold for fast).
  4. Press A to leave.

Good to know

In the Timekeeping Mode, press A to see which Home City is set.

From Casio's guide, page 6

Set an alarm

  1. Press C until the Alarm Mode shows.
  2. Press D to pick one of the five alarms.
  3. Hold A for at least one second, until the hour digits flash.
  4. Press D or B to set the hour (in 12-hour format, A marks a.m. and P marks p.m.), press C to move to the minutes, D or B again.
  5. Press A to leave.

Good to know

In the Alarm Mode, press B on an alarm or the hourly signal to turn it on or off; hold D to test the sound.

The alarm beeps for 10 seconds; press any button to stop it.

From Casio's guide, page 8

Light

  1. Press L in any mode to light the display.

Good to know

The light goes off by itself when an alarm starts and does not come on while a beeper sounds.

From Casio's guide, page 6

Button beep

  1. Leave any setting screen and wait for any beeper to stop.
  2. Hold C for at least three seconds: the beep toggles, and MUTE shows while it is off.
  3. Holding C also changes the current mode.

Good to know

Alarms and the timer still sound with the beep off.

From Casio's guide, page 14

Stopwatch

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

Good to know

It counts in 1/100 seconds up to 23 hours 59 minutes 59.99 seconds, then starts again from zero.

From Casio's guide, page 10

Countdown timer

  1. Press C until the Timer Mode shows.
  2. If a countdown is running, pause it with D and press B to reset it.
  3. Hold A for at least one second, until the hours flash.
  4. Press D or B to set the hours, press C to move to the minutes, D or B again.
  5. Press A to leave the setting screen.
  6. Press D to start; press D again to pause and resume.
  7. To go back to the start time, pause with D and then press B.

Good to know

The start time is set in whole minutes up to 24 hours; 0:00 gives a 24-hour countdown.

It beeps for ten seconds at zero; press any button to stop it.

From Casio's guide, page 11

Module 3531 specs

Type
quartz
Power
Approx. battery life: 3 years on CR1616 · other watches that take CR1616
Accuracy
±30 seconds per month
Functions
World time, Stopwatch, Timer, Alarm/hourly time signal, Light, Light color, Calendar, Mute feature, Telememo, 12/24-hour format
Manual
Casio's operation guide for module 3531

Watches with the 3531