Casio Watch Manual

Important Information

Read this important information before proceeding.

Precautions

• Do not expose watches to extreme temperatures.
• Avoid rough handling and dropping.
• Do not fasten the watch band too tightly. A finger should pass between your wrist and the band.
• Clean with a dry soft cloth or a soft cloth dampened with a mild neutral detergent solution. Never use volatile agents like gasoline, solvents, or spray cleaners.
• Store watches in a dry place when not in use.
• Avoid contact with gasoline, cleaning solvents, spray aerosols, adhesives, paint, etc., as chemical reactions can damage gaskets, cases, and polish.

Battery

The battery installed at the factory is discharged during shipping and storage. If you notice signs of low power (dim display), replace the battery at an authorized CASIO service center or dealer.

Water Resistance

Watches are classified by water resistance level (I to V). Consult the table to determine correct usage.

Notes:

• Level I watches are not water-resistant. Avoid all moisture.
• Level II (WR) means water-resistant according to ISO 2281. Brief contact with water is acceptable.
• Level III (5 Bar/50 meters) watches can withstand water pressure and are suitable for showering and brief swimming.
• Level IV (10 Bar/100 meters) watches are suitable for regular swimming and snorkeling.
• Level V (20 Bar/200 meters) watches are suitable for scuba diving (excluding depths requiring helium-oxygen mixtures).

Care of Your Watch

Never attempt to open the case or remove the back cover yourself.

The rubber gasket, which protects against water and dust, should be replaced every 2-3 years.

If moisture enters the watch, have it checked immediately by a dealer or CASIO distributor.

Strap Care

• Be careful when cleaning straps with silk-screened images to avoid damaging the designs.
• For plastic straps: A white powdery substance may appear; this is harmless and can be wiped off. Sweat or moisture can damage plastic straps. Wipe them clean regularly.
• For fluorescent cases and straps: Prolonged exposure to direct sunlight can cause the fluorescent color to fade. Contact with moisture can also cause fading. Wipe off moisture promptly. Rubbing fluorescent surfaces can transfer the color.

Radio Controlled Timekeeping

This section explains how to use the radio-controlled timekeeping feature.

Receiving the Time Signal

Your watch can receive a time signal and adjust its time automatically. There are two methods:

• Automatic Reception: The watch automatically receives the signal five times a day (0:00, 1:00, 2:00, 3:00, 4:00 AM).
• Manual Reception: You can initiate reception by performing specific button operations (see "Manual Signal Reception").

Conditions for Reception:

• Place the watch near a window, away from metal objects. The 12 o'clock position should face the window.
• Avoid areas with strong electromagnetic interference (TVs, refrigerators, computers), near radio stations, inside reinforced concrete structures, underground, in tunnels, near high-voltage power lines, neon signs, or noisy radio transmitters, near railways, highways, or airports, or inside trains or cars.
• Nighttime reception is generally better than daytime reception.

Signal Reception Indicator

An indicator shows the quality of the received signal. For optimal reception, place the watch in an area with the strongest signal.

[Diagram: Illustration of signal indicator levels, from weak to strong.]

Manual Signal Reception

1. Place the watch on a flat surface with the 12 o'clock side facing the transmitter.
2. In Current Time Mode, press and hold the [D] button for 2 seconds until a beep sounds.
3. Press the [D] button again to exit reception mode.

Reception takes 2 to 12 minutes. Do not move the watch or press buttons during this time.

If the signal is not received, an "ERR" message may appear.

Troubleshooting Radio Signal Reception

Setting Current Time

Your watch automatically adjusts to radio signals. If you are outside the reception area, you can set the time manually.

Setting Your Home City

Select the city code for your current location.

If you use the watch outside the transmitter range, you will need to set it manually. Refer to "Manual Time and Date Setting."

How to Set Your Watch to Your City

1. In Current Time Mode, press and hold the [A] button. The city code will flash, indicating setting mode.
2. Press [A] or [C] to cycle through settings: City Code, DST, 12/24-hour format.
3. Use [D] and [B] to adjust values.
4. Press [A] twice to exit setting mode.

[Diagram: Illustration of the watch face showing time, date, day of week, city code, and DST indicator.]

Manual Time and Date Setting

Current and World Time modes are linked. Ensure your home city time is set correctly.

1. In Current Time Mode, press and hold [A] until the city code flashes.
2. Press [A] or [C] to cycle through settings: City Code, Reception Mode, DST, 12/24-hour format.
3. Use [D] and [B] to adjust values.
4. Press [A] twice to exit.

Settings:

• City Code: Select your home city.
• Reception Mode: AUTO (automatic selection of RGN/Mainflingen), DCF (Mainflingen), MSF (Rugby), OFF (disable).
• DST: AUTO (automatic switching), OFF (Standard Time), ON (Daylight Saving Time).

Note: If your city code is not LON, PAR, BER, or ATH, the transmitter indicator will show "OFF".

12/24-Hour Format

The selected format applies to all modes.

• 12-Hour Format: 'P' indicates PM (afternoon). 'A' indicates AM (morning) for most modules. Modules 2866/2867 do not show AM/PM indicators.
• 24-Hour Format: Displays time from 0:00 to 23:59.

Power Saving Function

If enabled, the watch enters a sleep mode when left in darkness for a period. The table shows screen status based on time in darkness.

To wake the watch from sleep mode: Place it in light, press any button, or turn it towards you.

World Time Mode

View the current time in up to 30 cities (29 time zones).

Use [D] to scroll forward (east) and [B] to scroll backward (west) through city codes.

Setting Standard/Daylight Saving Time for a City:

1. In World Time Mode, display the city code.
2. Press and hold [A] to toggle between DST (indicator appears) and Standard Time (indicator absent).

This setting only affects the displayed city. DST is one hour ahead.

Recording Time Mode

Save up to 30 records of current time (month, date, hour, minute, second, DST) for events.

How to Record Time

In Current Time Mode, press and hold [B] to record the current time. The record flashes for 2 seconds and is assigned a number (01-30). If memory is full, record #1 is deleted, and others shift up.

How to Read Data

In Recording Time Mode, use [D] and [B] to scroll through saved records.

[Diagram: Illustration showing record number, date, and time.]

How to Delete Data

In Recording Time Mode, press and hold [A] to delete all records.

Alarm Mode

Features 4 standard alarms, 1 snooze alarm, and an hourly time signal.

Setting Alarms

1. In Alarm Mode, use [D] to select an alarm (AL1-AL4, SNZ).
2. Press and hold [A]. The hour digits will flash.
3. Press [C] to cycle through Hours and Minutes.
4. Use [D] to increase and [B] to decrease digits.
5. Press [A] to exit setting mode.

The alarm will activate automatically. The [SNZ] indicator flashes during snooze.

Checking Alarms

In Alarm Mode, press [D] to select an alarm. Press [B] to cycle through ON/OFF states.

An alarm indicator appears on screen in all modes when an alarm is active.

Hourly Time Signal

1. In Alarm Mode, use [D] to select the hourly time signal (SIG).
2. Press [B] to turn it ON or OFF.

The hourly time signal indicator appears on screen when active.

Stopwatch Mode

Measure elapsed time, split times, and the first two finishers. Maximum measurement is 23 hours, 59 minutes, 59.99 seconds.

Measuring Time

• Pure Time: [D] Start -> [D] Stop -> [D] Restart -> [D] Stop -> [B] Reset.
• Split Time: [D] Start -> [B] Split -> [B] Unsplit -> [D] Stop -> [B] Reset.
• 1st/2nd Place Time: [D] Start -> [B] Split -> [D] Stop (1st place time recorded) -> [B] Split (2nd place time recorded) -> [D] Stop -> [B] Reset.

[Diagram: Illustrations of stopwatch operations.]

Backlight

Features an electro-luminescent backlight for low-light conditions.

Auto-Illumination

When enabled, the backlight activates for 1 second when the watch is tilted towards you at a certain angle (approx. 40 degrees) in low light conditions.

[Diagram: Illustration showing how to tilt the watch for auto-illumination.]

Manual Illumination

Pressing the [L] button in any mode illuminates the screen for 1 second.

Enabling/Disabling Auto-Illumination

In Current Time Mode, press and hold [L] for 2 seconds. An indicator appears when enabled.

Warning: Auto-illumination is disabled after 6 hours of continuous use to conserve battery.

Battery

This watch uses a solar rechargeable battery. It converts sunlight into electrical energy.

Battery Care

• Keep the watch exposed to light as much as possible.
• The rechargeable battery may lose capacity over many years. Contact CASIO for replacement.
• Only use CASIO CTL1616 battery. Other types may damage the watch.
• Replacing the battery erases all data.
• Use Power Saving Mode and store in a well-lit place for long-term storage.

Battery Power Indicator

Shows the current charge level. Different levels affect function availability.

• HIGH/MID: All functions available.
• LOW: Some functions may be unavailable.
• CHARGE (CHG) flashing: Battery is low, place in light immediately.
• Level 4: All functions stop. Data may be lost. Functions resume after charging to Level 2.

[Diagram: Illustration of battery indicator levels.]

Charging Precautions

• Avoid overheating the watch. Do not charge in direct sunlight on a car dashboard, near incandescent lamps, or in intense heat for extended periods.

Charging Time

Approximate times required to reach different charge levels based on light intensity.

Specifications

• Accuracy: +/- 15 seconds per month (without radio signal reception).
• Timekeeping: Hours, minutes, seconds, AM/PM indicator, month, date, day of week. 12/24-hour format.
• Calendar: Auto-calendar programmed from 2000 to 2099.
• Radio Reception: Automatic (5 times daily) and manual reception.
• Transmitters: DCF77 (Mainflingen, Germany), MSF60 (Rugby, England).
• World Time: 30 cities (29 time zones).
• Alarm: 4 standard alarms, 1 snooze alarm, hourly time signal.
• Stopwatch: 1/100 second, 23:59'59.59" measurement range, split times, 2-finisher times.
• Other: Electro-luminescent backlight, auto-illumination, battery power indicator, power saving function.

City Code Table

List of city codes and their corresponding time zone differences from GMT.

Data as of June 2000.