Watch Catalog

Casio module 3557

Quartz module. 3557 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 3557

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 SET stops flashing: the daily step target flashes first.
  2. Press C to step through the settings: seconds, hour, minute, 12/24-hour, year, month, day, button tone, light duration, then back to the step target.
  3. On the seconds, press D to reset them to 00.
  4. On the hour, minute, year, month or day, press D or E to change it; mind the P indicator for p.m.
  5. Press A to leave the setting screen.

Good to know

Resetting the seconds between 30 and 59 adds one minute.

For 12-hour or 24-hour time, press C four times after SET stops flashing, so 12H or 24H flashes, then press D to switch.

From any other mode, hold C for at least two seconds to go back to the Timekeeping Mode.

In the Timekeeping Mode, press E to switch between the date and time and the step count; D shows the step count log.

The watch has no summer time setting; the year runs from 2000 to 2099.

From Casio's guide, page EN-11

Dual Time and the time swap

  1. In the Timekeeping Mode, press C until DT shows (the Dual Time Mode, after the Stopwatch, Recall and Timer Modes).
  2. Hold A for at least two seconds and let go when the Dual Time hour flashes.
  3. Press D or E to set the hour, then press C and set the minutes the same way, in 15-minute steps.
  4. Press A to leave the setting screen.
  5. To swap your current location time and the Dual Time, for example after a flight, hold E for at least two seconds in the Dual Time Mode.

Good to know

The watch has no Home City list; you set the Dual Time hour and minutes by hand.

From Casio's guide, page EN-47

Set an alarm

  1. In the Timekeeping Mode, press C until AL1 shows (the Alarm Mode, after the Dual Time Mode).
  2. Press D to pick an alarm, AL1 to AL5.
  3. Hold A for at least two seconds and let go when the hour flashes.
  4. Press D or E to set the hour, then press C and set the minutes the same way.
  5. Press A to leave the setting screen.
  6. Press E until On shows so the alarm is on; each press switches it between On and off (two dashes).
  7. Hold C for at least two seconds to go back to the Timekeeping Mode.

Good to know

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

Hourly signal: in the Alarm Mode, press D until SIG shows, then press E to switch it on or off.

The alarm indicator shows when at least one alarm is on.

From Casio's guide, page EN-50

Light

  1. Press B to light the display.

Good to know

To choose 1.5 or 3 seconds of light: in the Timekeeping Mode, hold A until SET stops flashing, press C nine times so LT shows, press D to switch between 1 and 3, then press A.

The light goes off by itself when an alarm starts to sound.

From Casio's guide, page EN-56

Button tone on or off

  1. In the Timekeeping Mode, hold A for at least two seconds and let go when SET stops flashing.
  2. Press C eight times so KEY♪ or MUTE flashes.
  3. Press D to switch between KEY♪ (tone on) and MUTE (tone off).
  4. Press A to leave the setting screen.

Good to know

The mute indicator shows while the button tone is off.

From Casio's guide, page EN-60

Stopwatch

  1. In the Timekeeping Mode, press C once: the Stopwatch Mode shows (STW).
  2. Press D to start, D to stop, and D again to resume.
  3. While it runs, press E for a split and lap time; both show at once.
  4. When it is stopped, press E to reset it to zero.
  5. Hold C for at least two seconds to go back to the Timekeeping Mode.

Good to know

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

Press A while it runs to see the current time in the lower display; press A again to go back.

With the stopwatch at zero, hold E for at least two seconds to swap where the lap and split times show.

Up to 200 lap and split records are kept and can be viewed in the Recall Mode; when memory is full the oldest is deleted.

From Casio's guide, page EN-33

Countdown timer

  1. In the Timekeeping Mode, press C until TMR shows (the Timer Mode, after the Stopwatch and Recall Modes).
  2. If the timer is running, press D to pause it, then E to reset it to the start time.
  3. Hold A for at least two seconds: the minutes flash. Press D or E to set them.
  4. Press C: the seconds flash. Press D or E to set them.
  5. Press A to leave the setting screen.
  6. Press D to start; press D to pause and again to resume.

Good to know

The start time runs from 1 second to 60 minutes; 0 minutes 00 seconds means 60 minutes.

At zero the watch beeps for 10 seconds; press any button to stop it. It does not beep when the battery is low.

From Casio's guide, page EN-44

Module 3557 specs

Type
quartz
Power
Approx. battery life: 2 years on CR1620 · other watches that take CR1620
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 3557

Watches with the 3557