Watch Catalog

Casio module 3542

Solar powered module. 3542 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 3542

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 let go when the Home City name shows.
  2. Press C to step through the settings: Home City, summer time, seconds, hours, minutes, year, month, day, 12/24-hour format, date format, day of the week language, button tone, light duration, auto time adjustment, then Power Saving.
  3. On the seconds, press D to reset them to 00.
  4. On the other settings, use B and D to change them (hold for fast).
  5. Press A to leave the setting screen.

Good to know

Resetting the seconds between 30 and 59 adds one minute.

For the 12/24-hour format, press C eight times from the Home City until 12H or 24H flashes, then press D to switch. In 12-hour format, P marks p.m.

When the watch is paired with a phone running CASIO WATCHES, it sets its time by itself, connecting at around 12:30 a.m., 6:30 a.m., 12:30 p.m. and 6:30 p.m. To set the time from the phone now: with the phone within one meter, press D in the Timekeeping Mode. TIME flashes, then OK shows and the time is adjusted.

The watch also sets itself from a time signal (Japan, China, the U.S., the U.K. and Germany) between midnight and 5:00 a.m. if the Home City is one with a signal. To receive it now, hold D for at least two seconds in the Timekeeping Mode until RCVD flashes; keep the watch still near a window.

Setting the time by hand on the watch cancels the automatic switching between standard time and summer time.

In any mode, hold C for at least one second to go back to the Timekeeping Mode.

From Casio's guide, page 19

Summer time

  1. In the Timekeeping Mode, hold A for at least two seconds and let go when the Home City name shows.
  2. Press C once: the summer time setting flashes.
  3. Press D to step through AUTO, OFF and ON.
  4. Press A to leave the setting screen.

Good to know

AUTO switches between standard time and summer time by itself, OFF always shows standard time, ON always shows summer time. The factory setting for every city is AUTO.

You can also change the Home City summer time setting in the CASIO WATCHES app while the watch is connected (hold C for at least three seconds to connect).

From Casio's guide, page 18

Home City

  1. In the Timekeeping Mode, hold A for at least two seconds and let go when the Home City name shows.
  2. Press B or D to scroll through the cities (hold for fast).
  3. Press A to leave, or press C first to set summer time for the city.

Good to know

Pick the city where you use the watch: the time signal is only received while the Home City is one with a signal (marked in the manual's City Table).

In the World Time Mode, press A and B together to swap your Home City time and World Time.

From Casio's guide, page 18

Set an alarm

  1. Press C until the Alarm Mode shows (AL), after the World Time Mode.
  2. Press D until the alarm you want shows: 1 to 4, or SNZ (the alarm with snooze).
  3. Hold A for at least two seconds and let go when the hour digits flash.
  4. Press B or D to set the hour; mind the P indicator for p.m.
  5. Press C: the minutes flash. Set them with B or D.
  6. Press A to leave the setting screen.
  7. If the alarm shows - - rather than on, press A to switch it on. ALM shows while an alarm is on.

Good to know

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

The SNZ alarm sounds up to seven times, five minutes apart; to cancel it, turn SNZ off.

To switch an alarm or the hourly time signal (SIG) on or off, select it with D in the Alarm Mode and press A.

To test the alarm, hold D in the Alarm Mode.

The alarm is muted while the battery is low or the watch is in Level 2 power saving.

Alarms can also be set in the CASIO WATCHES app.

From Casio's guide, page 22

Light

  1. Press B to light up the face.
  2. To change how long it stays on: in the Timekeeping Mode, hold A for at least two seconds until the Home City name shows, then press C 12 times: LIGHT shows.
  3. Press D to choose 2 or 4 seconds, then A to leave.
  4. Auto light (the face lights when you tilt the watch 40 degrees or more towards you): in the Timekeeping Mode, hold B for at least three seconds to turn it on or off; LT shows while it is on.

Good to know

The light does not come on while a beeper sounds or a time signal is being received.

Auto light does not work while CHG shows. Frequent use of the light runs down the battery.

From Casio's guide, page 8

Button beep

  1. In the Timekeeping Mode, hold A for at least two seconds and let go when the Home City name shows.
  2. Press C 11 times: KEY♪ or MUTE flashes.
  3. Press D to switch between KEY♪ (beep on) and MUTE (beep off), then A to leave.

Good to know

Alarm and timer tones still sound with the beep off.

From Casio's guide, page 27

Stopwatch

  1. Press C until the Stopwatch Mode shows (ST).
  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 go back to the running time.

Good to know

It counts in 1/100 seconds for the first hour, then in seconds, up to 23 hours 59 minutes 59 seconds.

For two finishers: start with D, press A at the first finisher and D at the second; the first time shows, press A to see the second, and A again to reset.

From Casio's guide, page 24

Countdown timer

  1. Press C until the Timer Mode shows (TR).
  2. If a countdown is running, press D to pause it, then A to reset it to the start time.
  3. Hold A for at least two seconds: the hours flash. Set them with B or D.
  4. Press C for the minutes, then C again for the seconds, and set each with B or D.
  5. Press A to leave the setting screen.
  6. Press D to start; D pauses and resumes it. When it is paused, press A to reset it to the start time.

Good to know

The start time can be up to 24 hours, in one-second steps; 0:00 00 gives a 24-hour countdown.

At zero a beeper sounds for 10 seconds; press any button to stop it.

The timer start time can also be set in the CASIO WATCHES app.

From Casio's guide, page 25

Factory reset

  1. In the Timekeeping Mode, hold A for at least two seconds and let go when the Home City name shows.
  2. Press C twice: the seconds flash.
  3. Hold B for at least seven seconds and let go when ALL stops flashing.

Good to know

This returns the watch settings, reminders, stopwatch, timer and alarms to the factory defaults.

It also deletes the pairing with your phone.

From Casio's guide, page 28

Module 3542 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 3542

Watches with the 3542