Casio 2688 G-Shock Watch User Guide

Casio 2688 G-Shock Watch

Getting Acquainted

Congratulations on your selection of this CASIO watch. To get the most out of your
Purchase, be sure to carefully read this manual and keep it on hand for later reference
when necessary. This watch does not have a time zone that corresponds to Greenwich
Mean Time differential of –3.5 hours. Because of this, the radio-controlled timekeeping and World Time functions will not display the correct time for Newfoundland, Canada

About This Manual

• The operational procedures for Modules 2608, 2638, and 2688 are identical. All of
  The illustrations in this manual show Module 2608.
• Button operations are indicated using the letters shown in the illustration.
• Each section of this manual provides you with the information you need to perform
  operations in each mode. Further details and technical information can be found in
  the “Reference” section

If the display of the watch is blank…

• If the sleep indicator (S/SLEEP) is displayed, it means that the display is blank because the watch is asleep. Power-saving function shuts it down to conserve power. Power Saving automatically turns off the display and enters a sleep state whenever your watch is left in a dark area for a certain period.
• The initial factory default setting is Power Saving on.
• The watch recovers from the sleep state if you move it to a well-lit area*, if you press any button, or if you angle the watch towards your face for reading.
• It can take up to two seconds for the display to turn on.
• See “Power Saving Function” for more information

General Guide

• Press C to change from mode to mode.
• In any mode, press L to illuminate the display

Radio-controlled Atomic Timekeeping

This watch receives a time calibration signal and updates its time setting accordingly. The time calibration signal includes both Standard Time and Daylight Saving Time
(summer time) data.

• This watch is designed to pick up the time calibration signal transmitted from Fort Collins, Colorado (USA). Reception is possible within North America*. The term “North America” in this User’s Guide refers to the area that consists of Canada, the continental United States, and Mexico.

Current Time Setting
This watch automatically adjusts its time setting in accordance with a time calibration
signal. You can also perform a manual procedure to set the time and date when necessary.

• The first thing you should do after purchasing this watch is to set your Home City,
  which is the city where you will normally use the watch. For more information, see
  “To set your Home City” below.
• When using the watch outside of the range of the transmitter in Fort Collins, you
  need to manually adjust the time as required. See “Timekeeping” for information
  about manual settings.

To set your Home City

1. In the Timekeeping Mode, hold down A until the city code starts to flash, which indicates the setting screen.
2. Use D(east) and B(west) to select the city code you want to use as your Home City.
   • The following are the city codes for major cities in North America.
   • LAX(P (Pacific) indicator): Los Angeles, San Francisco, Las Vegas, Seattle,
     Vancouver, Tijuana
   • DEN(M (Mountain) indicator): Denver, El Paso, Edmonton, Culiacan
   • CHI(C (Central) indicator): Chicago, Houston, Dallas/Fort Worth, New Orleans, Winnipeg, Mexico City
   • NYC(E (Eastern) indicator): New York, Detroit, Miami, Boston, Montreal
   • Note that this watch does not have a city code that corresponds to Newfoundland.
3. Press A twice to exit the setting screen.
   • The first press of A displays the 12/24-hour setting screen. Pressing A again exits the setting screen.

Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal: auto receive and manual receive.

• Auto Receive
  With auto receive, the watch automatically picks up the time calibration signal four
  times a day at 2:00 a.m., 3:00 a.m., 4:00 a.m., and 5:00 a.m. For more information, see “About Auto Receive”.
• Manual Receive
  Manual receive lets you start a time calibration receive operation with the press of a button. For more information, see “To perform manual receive”. Important!
• When getting ready to receive the time calibration signal, position the watch as
  shown in the nearby illustration, with its 12 o’clock side facing towards a window.
  Make sure there are no metal objects nearby

• The watch should not be on its side or facing the wrong way.
• Proper signal reception can be difficult or even impossible under the conditions
  listed below.

• Signal reception is normally better at night than during the day.
• Time calibration signal reception takes from two to six minutes, but in some cases it can take as long as 12 minutes. Take care that you do not perform any button
  operations or move the watch during this time.

• Under good reception conditions, signal reception is possible within a radius of
  about 2,000 miles (3,000 kilometers) from the Fort Collins transmitter.
• At distances further than about 600 miles (1,000 kilometers) from the transmitter,
  signal reception may not be possible during certain times of year or times of day.
  Radio interference may also cause problems with reception.
• See the information under “Signal Receive Troubleshooting” if you experience
  problems with time calibration signal reception.

About Auto Receive
When auto receive is turned on, the watch automatically starts to receive the time
calibration signal when the time in the Timekeeping Mode reaches 2:00 a.m., 3:00 a.m., 4:00 a.m., and 5:00 a.m. each day (calibration times).

About the Receiving Indicator
The receiving indicator shows the strength of the calibration signal being received. For
best reception, be sure to keep the watch in a location where the signal strength is strongest.

• Even in an area where the signal strength is strong, it takes about 10 seconds for the signal reception to stabilize enough for the receiving indicator to indicate signal strength.
• Use the receiving indicator as a guide for checking signal strength and for finding the best location for the watch during signal receive operations.
• Following reception of the time calibration signal and calibration of the watch’s time setting, the Level 4 receiving indicator will remain on the display in all modes. The Level 4 receiving indicator will not be displayed if signal reception was unsuccessful or after you adjust the current time setting manually.
• The Level 4 receiving indicator is displayed only when the watch can successfully receive both time and date data. It does not appear when only time data is received.
• The Level 4 receiving indicator indicates that at least one of the auto calibration
  signal receive operations was successful. Note, however, that the Level 4 receiving
  indicator is cleared from the display at 3:00 a.m. each day.

To perform manual receive

1. Place the watch on a stable surface so its top (12 o’clock side) is facing towards a window.
2. In the Timekeeping Mode, hold down D for about two seconds until the watch beeps.
   • Release D and the message RC! appears to indicate that signal reception has started.
   • Time calibration signal reception takes from two to six minutes. Take care that you do not perform any button operations or move the watch during this time.
   • After signal reception is complete, the display of the watch changes to the Last Signal screen.

To turn auto receive on and off

1. In the Timekeeping Mode, hold down A until the city code starts to flash, which indicates the setting screen.
2. Press C twice to move the flashing to the auto receive on/off setting.
3. Press D to toggle auto receive on (ON) and off (OF).
   • If the current Home City setting is a city code that does not support signal reception, “xx” appears in place of the on/off indicator. This means you cannot turn auto receive on or off.
4. Press A twice to exit the setting screen.
   • For information about the city codes that support signal reception, see “To set your Home City”.

Signal Receive Troubleshooting

Check the following points whenever you experience problems with the calibration signal reception.

World Time

World Time shows the current time in 30 cities (29 time zones) around the world.

• For full information on city codes, see the “City Code Table”.
• The current time for all city codes in the World Time Mode is calculated in accordance with the Greenwich Mean Time (GMT) differential for each city, based on your Home City time setting.
• All of the operations in this section are performed in the World Time Mode, which you enter by pressing C.

To view the time for another city code
While in the World Time Mode, press D to scroll through the city codes (time zones) to the east or B to scroll to the west.

• If the current time shown for a city is wrong, check your Timekeeping Mode time and Home City settings and make the necessary changes.

Time Recorder

The Time Recorder lets you store up to 30 records of the current time (month, day, hour, minutes, seconds, and DST on/off setting) with the touch of a button. One way you can use the Time Recorder is to record the start time and the end time of a particular event.

To record a Time Recorder time
In the Timekeeping Mode, hold down B to record the Home City time (month, day, hour, minutes, seconds, and DST on/off setting.

• The recorded time flashes for about two seconds, and then it is assigned a record number. After that, the Timekeeping Mode screen appears.
• Records are assigned numbers sequentially from #01 through #30.
• Storing a new time record when there are already 30 records stored in memory automatically deletes record #01, shifts the remaining records upwards by 1, and
  stores the new record as #30.

Alarms

The Alarm Mode gives you a choice of four one-time alarms and one snooze alarm. Also, use the Alarm Mode to turn the Hourly Time Signal (SIG) on and off.

• There are five alarms numbered AL1 through AL4, and SNZ. You can configure SNZ as a snooze alarm only. Alarms AL1 through AL4 can be used as one-time alarms only.
• Alarm settings (and Hourly Time Signal settings) are available in the Alarm Mode, which you enter by pressing C

1. In the Alarm Mode, use D to scroll through the alarm screens until the one whose time you want to set is displayed.
2. After you select an alarm, hold down A until the hour setting of the alarm time starts to flash, which indicates the setting screen.
   • This operation automatically turns on the alarm.
3. Use C to move the flashing between the hours and minute settings.
4. While a setting is flashing, use D (+) and B (–) to change it.
5. Press A to exit the setting screen.
   • When setting the alarm time using the 12-hour format, take care to set the time correctly as a.m. (An indicator) or p.m. (P indicator)

Alarm Operation

The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the
watch is in. In the case of the snooze alarm, the alarm operation is performed a total
of seven times, every five minutes, or until you turn the alarm off.

• Pressing any button stops the alarm tone operation.
• Performing any one of the following operations during a 5-minute interval between
  snooze alarms cancels the current snooze alarm operation. Displaying the Timekeeping Mode setting screen. Displaying the snooze alarm setting screen

Recovery Times
The table below shows the amount of exposure that is required to take the battery from
one level to the next.

Timekeeping

• The day of the week is automatically displayed in accordance with the date (year,
  month, and day) settings.
• The year can be set in the range of 2000 to 2099.
• The watch’s built-in full automatic calendar makes allowances for different month
  lengths and leap years. Once you set the date, there should be no reason to change
  it except after you have the watch’s battery replaced or when battery power drops to Level 4.
• The current time for all city codes in the Timekeeping Mode and World Time Mode is calculated in accordance with the Greenwich Mean Time (GMT) differential for each city, based on your Home City time setting.
• GMT differential is calculated by this watch based on UTC* data.
• The letters “UTC” stand for “Universal Time Coordinated,” which is the worldwide
  scientific standard of timekeeping. It is based upon carefully maintained atomic
  (cesium) clocks that are accurate to within microseconds. Leap seconds are added or subtracted as necessary to keep UTC in sync with the Earth’s rotation. The reference point for UTC is Greenwich, England.

City Code Table

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Casio 2688 G-Shock Watch-FAQs