Watch Catalog

Casio module 3157

Quartz module. 3157 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 3157

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 city code flashes.
  2. Press D or B to choose your Home City first.
  3. Press C to step through the settings: DST, 12/24-hour format, seconds, hour, minute, year, month, day, then temperature unit.
  4. On the seconds, press D to reset them to 00.
  5. On the hour, minute, year, month or day, press D to go up and B to go down.
  6. On the DST or 12/24-hour setting, press D to switch.
  7. Press A to leave the setting screen.

Good to know

Resetting the seconds between 30 and 59 adds one minute.

In 12-hour format the P indicator marks p.m. times; the year runs from 2000 to 2099.

From Casio's guide, page 1

Daylight saving time

  1. In the Timekeeping Mode, hold A until the city code flashes.
  2. Press C once to reach the DST setting.
  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.

From Casio's guide, page 1

Home City

  1. In the Timekeeping Mode, hold A until the city code flashes.
  2. Press D (east) or B (west) until your city shows.
  3. Press A to leave.

Good to know

If your city is not in the list, pick one in the same time zone. World Time follows the Home City settings.

From Casio's guide, page 1

Set an alarm

  1. Press C four times to reach the Alarm Mode (after World Time, Stopwatch and Countdown Timer).
  2. Press D to pick the alarm: AL1 to AL4, SNZ (snooze alarm) or SIG (hourly signal).
  3. Hold A until the hour flashes; this also switches the alarm on.
  4. Press D to go up or B to go down, and C to switch between hour and minutes.
  5. Press A to leave.

Good to know

AL1 to AL4 are one-time alarms. In the Alarm Mode, press A on an alarm or SIG to turn it on or off.

Hold D in the Alarm Mode to test the sound.

From Casio's guide, page 4

Light

  1. Leave any setting screen first.
  2. Press B in any mode to light the display.
  3. Use it sparingly: frequent use runs down the battery.

From Casio's guide, page 4

Button beep

  1. Leave any setting screen first.
  2. Hold C to switch the button beep on or off.
  3. Check the display: the mute indicator shows in all modes while the beep is off.

Good to know

Holding C also changes the mode. Alarms, the hourly signal and the timer alarm still sound with the beep off.

From Casio's guide, page 4

Stopwatch

  1. Press C twice 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 clear it.
  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 shows up to 59 minutes 59.99 seconds, then starts again from zero until you stop it.

From Casio's guide, page 3

Countdown timer

  1. Press C three times to reach the Countdown Timer Mode.
  2. With the start time shown, hold A until the hour flashes.
  3. Press C to step through hours, minutes and auto-repeat; press D to go up or B to go down, or D to switch auto-repeat.
  4. Press A to leave the setting screen.
  5. Press D to start and D to pause; when it is paused, press A to reset it.

Good to know

It runs from one minute to 24 hours; set 0:00 for 24 hours.

An alarm sounds for 10 seconds at zero; press any button to stop it.

From Casio's guide, page 3

Module 3157 specs

Type
quartz
Power
Approx. battery life: 3 years on CR2025 · other watches that take CR2025
Accuracy
±20 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 3157

Watches with the 3157