Casio Watch User Manual
Models: Module 2328, 5051, 5118, 5205, MTD-1057, EF-501, EF-503, EF-505, EF-512, EF-513, EF-524, EF-534, EF-539, MSY-500, ES-531
Important Information
Battery
If the display becomes dim or the backlight fails, replace the battery at a CASIO dealer. The included battery is for testing purposes and may have a shorter lifespan than a standard battery.
Water Resistance
Watches are classified by water resistance levels (I to V). Consult the table below to determine usage guidelines.
| Marking on Case | Splashes, Rain | Car Washing | Swimming | Skin Diving, Scuba Diving (excluding helium-oxygen mix) |
|---|---|---|---|---|
| I | No | No | No | No |
| II WATER RESISTANT | Yes | No | No | No |
| III 50M WATER RESISTANT | Yes | Yes | No | No |
| IV 100M WATER RESISTANT | Yes | Yes | Yes | No |
| V 200M WATER RESISTANT | Yes | Yes | Yes | Yes |
Notes:
- Level I: Not water-resistant. Avoid all moisture.
- Level III: If exposed to salt water, rinse thoroughly and dry.
- Level IV: If exposed to salt water, rinse thoroughly and dry.
- Level V: Suitable for scuba diving (excluding depths requiring helium-oxygen mixtures).
WARNING!!!
For all watch types, do not:
- Press buttons underwater.
- Change time underwater.
- Unscrew the crown underwater.
Care for Your Watch
Battery Replacement: The rubber gasket protecting the watch from water and dust should be replaced every 2-3 years.
Moisture Inside: If moisture enters the watch, have it checked immediately by a CASIO dealer.
Temperature: Avoid exposing the watch to extreme temperatures (high or low).
Handling: Avoid rough handling and dropping the watch.
Strap Tightness: Do not fasten the strap too tightly. A finger should fit between your wrist and the strap.
Cleaning: Use a dry soft cloth or a soft cloth dampened with a mild neutral detergent solution. Never use volatile substances (e.g., gasoline, thinners, spray cleaners).
Storage: Store the watch in a dry place when not in use.
Chemicals: Avoid contact with gasoline, cleaning solvents, spray aerosols, adhesives, paint, etc. Chemical reactions can damage gaskets, cases, and polish.
Silk-screened Straps: Be careful when cleaning straps with silk-screened designs to avoid damaging the patterns.
For Polymer Straps:
- A white powdery substance may appear on the strap. This is harmless and can be wiped off with a soft cloth.
- Sweat or moisture, or storage in high humidity can cause damage, tearing, or cracking. To ensure long strap life, wipe off dirt and moisture with a soft cloth frequently.
For Fluorescent Cases and Straps:
- Prolonged exposure to direct sunlight can cause fluorescent colors to fade.
- Prolonged contact with moisture can also cause fading. Wipe off any moisture promptly.
- Rubbing fluorescent surfaces against other surfaces can transfer the fluorescent paint.
Disclaimer
CASIO COMPUTER CO., LTD. is not liable for any damage resulting from the use of this watch and accepts no claims from third parties.
Setting Current Time
Diagram Description: A diagram shows a watch face with hour, minute, and second hands, a stopwatch second hand, a crown, and buttons labeled 'A' and 'B'. The crown is depicted in three positions: normal, first pull (for date setting), and second pull (for time setting).
- Pull the crown to the second click. The second hand will stop.
- Turn the crown to set the current time.
- Return the crown to its normal position.
Setting Current Day
- Pull the crown to the first click.
- Turn the crown towards you (counter-clockwise) to set the current day.
- Return the crown to its normal position.
Caution: Do not set the day between 10 PM and 6 AM.
Stopwatch Use
This watch can measure elapsed time up to 11 hours, 59 minutes, and 59 seconds.
Do not operate the stopwatch while the crown is pulled out.
- Press button "A" to start measurement.
- Press button "A" to stop measurement. You can resume by pressing "A" again.
- Press button "B" to reset the stopwatch.
Stopwatch Second Hand Synchronization
Frequent use of the stopwatch may cause the watch and stopwatch hands to become unsynchronized. To reset them:
- Press button "B" to reset the stopwatch.
- Pull the crown to the second click.
- Press button "A" to move the stopwatch second hand to the 12 o'clock position.
- Return the crown to its normal position after synchronization.
Product Information
Product Name: Wristwatch (electronic/electro-mechanical quartz) (men's/women's)
Brand: CASIO
Manufacturer: CASIO COMPUTER Co., Ltd.
Manufacturer Address: 6-2, Hon-machi 1-chome, Shibuya-ku, Tokyo 151-8543, Japan
Importer: OOO "Casio", Moscow, Russia
Country of Origin: Japan
Warranty Period: 1 year
Authorized Service Organization Address: As per warranty card.
Product Compliance: Complies with GOST 26270-98 (clause 4.35). Certificate of Conformity No. ROSS JP. АЯ 46.Д00003.
