Watch Catalog

Casio module 3540

Solar powered module. 3540 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 3540

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 two seconds and release it when the Home City name appears.
  2. Press C to step through the settings: summer time, seconds, hours, minutes, year, month, day, then 12/24-hour format and the other settings.
  3. On the seconds, press D to reset them to 00.
  4. On the other settings, press B or D to change the value (hold for fast).
  5. Press A to finish.

Good to know

Resetting the seconds between 30 and 59 adds one minute.

To switch between 12-hour and 24-hour format, press C eight times from the Home City and then D.

From Casio's guide, page 19

Daylight saving time

  1. In the Timekeeping Mode, hold A for at least two seconds and release it when the Home City name appears.
  2. Press C once to reach the summer time setting.
  3. Press D to cycle through AUTO, OFF (always standard time) and ON (always summer time).
  4. Press A to finish.

Good to know

AUTO, the factory setting, switches between standard and summer time on its own.

From Casio's guide, page 18

Home City

  1. In the Timekeeping Mode, hold A for at least two seconds and release it when the Home City name appears.
  2. Press B or D to change the city (hold for fast).
  3. Press C to go on to the summer time setting, then press A to finish.

From Casio's guide, page 18

Set an alarm

  1. Press C twice to reach the Alarm Mode (after the World Time Mode).
  2. Press D to pick the alarm: 1 to 4, or SNZ for the snooze alarm.
  3. Hold A for at least two seconds and release it when the hour flashes.
  4. Press B or D to set the hour, then C and B or D for the minutes.
  5. Press A to leave.

Good to know

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

The snooze alarm sounds up to seven times, five minutes apart.

From Casio's guide, page 22

Light

  1. Press B to light the face.
  2. To turn Auto Light on or off, hold B for at least three seconds in the Timekeeping Mode; LT shows while it is on.
  3. To change the duration: in the Timekeeping Mode hold A until the Home City name appears, then press C 12 times to show LIGHT.
  4. Press D to choose 2 or 4 seconds, then A to leave.

Good to know

With Auto Light on, the face lights when you tilt the watch 40 degrees or more towards you.

From Casio's guide, page 8

Button beep

  1. In the Timekeeping Mode, hold A for at least two seconds and release it when the Home City name appears.
  2. Press C 11 times: KEY♪ or MUTE flashes.
  3. Press D to switch, then A to leave.

Good to know

Alarm and timer tones still sound with the beep muted.

From Casio's guide, page 27

Stopwatch

  1. Press C three times to reach the Stopwatch 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; press A again to let the display catch up.

Good to know

It shows 1/100 seconds for the first hour, then whole seconds, up to 24 hours.

From Casio's guide, page 24

Countdown timer

  1. Press C four times to reach the Timer Mode.
  2. Hold A for at least two seconds until the hours flash.
  3. Press B or D to set the hours, then C for the minutes and C again for the seconds.
  4. Press A to leave the setting screen.
  5. Press D to start, D to pause and D to carry on; when it is paused, press A to reset it.

Good to know

Set it in one-second steps up to 24 hours; 0:00 00 counts down 24 hours.

A beeper sounds for 10 seconds at zero; press any button to stop it.

From Casio's guide, page 25

Module 3540 specs

Type
solar
Power
Tough Solar (Solar powered)
Accuracy
±15 seconds per month (with no signal calibration and mobile link function)
Functions
World time, Stopwatch, Timer, Alarm/hourly time signal, Light, Light color, Calendar, Mute feature, Energy saving feature, Battery display/alert, Run time, 12/24-hour format, Date/month display swapping, Day display, Time adjustment details
Manual
Casio's operation guide for module 3540

Watches with the 3540