Watch Catalog

Casio module 5594

Quartz module. 5594 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 5594

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 D for at least two seconds and release it when the Home City name shows.
  2. Press D: the seconds flash.
  3. Press E to move through the settings: seconds, hours, minutes, year, month, day.
  4. Use C and A to change the flashing setting; on the seconds, press A to reset them to 00.
  5. Press D to exit the setting screen.
  6. To switch between 12-hour and 24-hour format: hold D until the Home City name shows, press E four times until 12H or 24H flashes, press A to toggle, then press D twice.
  7. To take the time from a paired phone now: with the phone within one meter, press B. TIME flashes, then OK shows and the time is adjusted.

Good to know

Paired with a phone running CASIO WATCHES, the watch corrects its time four times a day, at around 12:30 a.m., 6:30 a.m., 12:30 p.m. and 6:30 p.m.; setting it by hand is for when it cannot connect with a phone.

Pressing A on the seconds adds 1 to the minutes when the count is between 30 and 59 seconds.

To turn auto time adjustment off, for example on an aircraft: hold D until the Home City name shows, press E five times until RCV shows, press A to choose OFF or ON, then press D twice.

From Casio's guide, page 8

Summer time

  1. In the Timekeeping Mode, hold D for at least two seconds and release it when the Home City name shows.
  2. Press E.
  3. Press A to cycle through AUTO (switches by itself), OFF (always standard time) and ON (always summer time).
  4. Press D twice to exit the setting screen.

Good to know

The factory default for all cities is AUTO.

DST shows while the indicated time is summer time.

World Time cities have their own summer time setting, made in the World Time Mode by holding D for at least two seconds.

From Casio's guide, page 7

Home City

  1. In the Timekeeping Mode, hold D for at least two seconds and release it when the Home City name shows.
  2. Use A and C to change the Home City.
  3. Press D twice to exit the setting screen, or press E first to set its summer time.

Good to know

To swap the Home City and the World Time City, hold L for at least two seconds in the World Time Mode until HT and WT flash and the hands start to move.

From Casio's guide, page 7

Set an alarm

  1. Press E until the Alarm Mode (ALM) shows.
  2. Use A and C to display the alarm you want, AL1 to AL5.
  3. Hold D for at least two seconds and release it when the hour digits flash.
  4. Use A and C to set the hour; in 12-hour format, P marks p.m.
  5. Press E: the minute digits flash. Use A and C to set the minutes.
  6. Press D to exit the setting screen, then hold E for at least two seconds to go back to the Timekeeping Mode.
  7. To switch an alarm on or off, display it with A or C in the Alarm Mode and press D.
  8. For the hourly time signal, press A or C until SIG shows and press D to switch it on or off.

Good to know

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

The alarm indicator shows while any alarm is on. The beeper does not sound when battery power is low.

You can also set alarms with the CASIO WATCHES app.

From Casio's guide, page 29

Realign the hands

  1. In the Timekeeping Mode, hold D for at least five seconds and release it when 00 starts to flash.
  2. If the second hand is not at 12 o'clock, use A and C to align it.
  3. Press E.
  4. If the hour and minute hands are not at 12 o'clock, use A and C to align them.
  5. Press D to exit the setting screen.

Good to know

Strong magnetism or impact can make the hands show a different time from the digital display.

From Casio's guide, page 32

Light

  1. Press L to light up the face.
  2. To switch Auto Light on or off, hold L for at least three seconds in the Timekeeping Mode. LT shows while it is on.
  3. To change how long the light stays on: hold D until the Home City name shows, press E three times until LT shows, press A to choose 1 (1.5 seconds) or 3 (three seconds), then press D twice.

Good to know

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

Auto Light turns itself off after about six hours.

Auto Light does not work while a beeper is sounding, while hands are moving or in the Compass Mode.

From Casio's guide, page 6

Button tone

  1. In the Timekeeping Mode, hold D for at least two seconds and release it when the Home City name shows.
  2. Press E twice: KEY♪ or MUTE flashes.
  3. Press A to choose KEY♪ (tone on) or MUTE (tone off).
  4. Press D twice to exit the setting screen.

Good to know

Alarm and timer tones still sound when the button tone is muted.

From Casio's guide, page 32

Stopwatch

  1. Press E until the Stopwatch Mode (STW) shows.
  2. Press A to start and A to stop; press A again to resume.
  3. For a split time, press C while it runs; press C again to release the split.
  4. When it is stopped, press C to reset it to all zeros.

Good to know

It measures in 1/100 seconds for the first hour and in seconds after that, up to 24 hours.

From Casio's guide, page 28

Countdown timer

  1. Press E until the Timer Mode (TMR) shows.
  2. Hold D for at least two seconds and release it when the minute digits flash.
  3. Use A and C to set the minutes.
  4. Press E: the hour digit flashes. Use A and C to set the hours.
  5. Press D to exit the setting screen.
  6. Press A to start the countdown, A to pause and A to resume.
  7. To reset a paused countdown to the start time, press C.

Good to know

The start time is set in 1-minute steps up to 24 hours.

A beeper sounds for 10 seconds at the end of the countdown; press any button to stop it. It does not sound when battery power is low.

You can also set the timer with the CASIO WATCHES app.

From Casio's guide, page 29

Factory reset

  1. In the Timekeeping Mode, hold D for at least two seconds and release it when the Home City name shows.
  2. Press D: the seconds flash.
  3. Hold C for at least five seconds and release it when RESET stops flashing.
  4. Press D to exit the setting screen.

Good to know

This returns watch settings, compass, altimeter, barometer, thermometer, altitude records, step count, stopwatch, timer and alarms to factory defaults.

It also deletes the phone pairing information.

Reset cannot be done while Mission Log is enabled.

From Casio's guide, page 33

Module 5594 specs

Type
quartz
Power
Approx. battery life: 2 years on CR2025 · other watches that take CR2025
Accuracy
±15 seconds per month (with no mobile link function)
Functions
World time, Sunrise/sunset display, Stopwatch, Timer, Alarm/hourly time signal, Light, Light color, Calendar, Mute feature, 12/24-hour format, Hand shift feature
Manual
Casio's operation guide for module 5594

Watches with the 5594