Watch Catalog

Casio module 3458

Quartz module. 3458 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 3458

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, press D until the Home City Time (T-1) shows (to check, press A: the T-1 indicator and city code show for about one second).
  2. Hold A until the seconds flash.
  3. Press C to step through the settings: seconds, DST, city code, hour, minutes, 12/24-hour format, year, month, day, then light duration.
  4. On the seconds, press D to reset them to 00.
  5. On the 12/24-hour format, press D to switch between 12H and 24H.
  6. On the hour, minutes, year, month or day, press D to go up and B to go down.
  7. Press A to leave the setting screen.

Good to know

Only the Home City Time (T-1) can be set; the Local Times T-2 to T-4 follow it.

Resetting the seconds between 30 and 59 adds one minute.

The day of the week follows the date by itself.

In 12-hour format, PM marks noon to 11:59 p.m.

From Casio's guide, page E-11

Daylight saving time

  1. In the Timekeeping Mode, press D until the Home City Time (T-1) shows.
  2. Hold A until the seconds flash, then press C: the DST setting shows.
  3. Press D to switch between on (summer time) and OFF (standard time).
  4. Press A to leave. The DST indicator shows while summer time is on.

Good to know

In the World Time Mode, holding A for about one second switches DST for the city shown; this cannot be done for UTC.

From Casio's guide, page E-14

Home City

  1. In the Timekeeping Mode, press D until the Home City Time (T-1) shows.
  2. Hold A until the seconds flash, then press C until the city code flashes.
  3. Press D (east) or B (west) until your city code shows.
  4. Press A to leave.

Good to know

To make a Local Time (T-2 to T-4) or the World Time city your Home City, display it and press A and B at the same time.

From Casio's guide, page E-11

Set an alarm

  1. Press C until the Alarm Mode shows (ALM, after the World Time Mode).
  2. Press D to step through the alarms -1 to -5 and the hourly signal (:00) until the alarm you want shows.
  3. Hold A until the hour flashes; this switches the alarm on as a one-time alarm.
  4. Press C to step through hour, minutes and the one-time or daily choice.
  5. On the hour or minutes, press D to go up and B to go down (in 12-hour format, mind a.m. or p.m.: PM marks p.m.); on the last setting, press D to switch between one-time and daily.
  6. Press A to leave the setting screen.
  7. To switch an alarm on or off later, select it with D and press A to cycle through off, one-time alarm on and daily alarm on. For the hourly signal, select it and press A to switch it on or off.

Good to know

An alarm sounds for 10 seconds in any mode; press any button to stop it.

A one-time alarm switches itself off after it sounds.

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

From Casio's guide, page E-22

Light

  1. Press L in any mode to light the display.
  2. To change the duration: on the Home City Time (T-1) screen, hold A until the seconds flash, then press C until the light duration setting (LT) shows.
  3. Press D to switch between 1.5 seconds and three seconds, then A to leave.

Good to know

The light turns off whenever an alarm sounds, and frequent use runs down the battery.

From Casio's guide, page E-17

Button beep

  1. In any mode (not while a setting is flashing), hold C to switch the button beep on or off.
  2. MUTE shows in all modes while the beep is off.

Good to know

Holding C also changes the mode.

Alarms, the hourly signal and the countdown alarm still sound with the beep off.

From Casio's guide, page E-34

Stopwatch

  1. Press C until the Stopwatch Mode shows (STW, 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 B to clear it to zero.
  4. For a split time, press B while it runs (SPL shows); press B 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, and keeps running in other modes.

From Casio's guide, page E-31

Countdown timer

  1. Press C until the Countdown Timer Mode shows (TMR, after the Alarm Mode).
  2. If a countdown is running, press D to pause it, then B to reset it to the start time; if it is paused, press B.
  3. Hold A until the start time flashes.
  4. Press C to step through hours, minutes and seconds, and D to go up or B to go down.
  5. Press A to leave the setting screen.
  6. Press D to start, D to pause, D to carry on; when paused, press B to reset.

Good to know

The start time is 1 second to 24 hours; set 0:00 00 for 24 hours.

At zero an alarm sounds for ten seconds; press any button to stop it. The timer then goes back to its start time.

From Casio's guide, page E-28

Module 3458 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, Mute feature, 12/24-hour format
Manual
Casio's operation guide for module 3458

Watches with the 3458