Casio Watch Module 4369 User Manual

Models: EF-508 / EF-509 / EF-527

Important Information

Battery

The battery installed at the factory may discharge during shipping and storage. If the display becomes faint, the battery needs replacement at an authorized CASIO service center or dealer.

Water Resistance

For all watch categories, avoid the following while underwater:

  • Pressing buttons.
  • Adjusting the crown.
  • Unscrewing the crown.

If the watch is exposed to saltwater, rinse it thoroughly with fresh water and dry it completely.

Do not wear watches with leather straps while swimming. Avoid prolonged contact of leather straps with water.

Care for Plastic Straps

A white powdery substance may appear on plastic straps. This is harmless and can be removed by wiping with a cloth. Sweat, moisture, or high humidity can damage, break, or crack plastic straps. Clean them with a soft cloth whenever possible.

Care for Fluorescent Cases and Straps

Prolonged exposure to direct sunlight or moisture can cause fluorescent colors to fade. Wipe off any moisture as soon as possible. Contact with other wet surfaces can also cause discoloration.

Water Resistance Classification

Watches are classified by water resistance levels (I to V) according to ISO 2281. Check the table below for proper usage:

RatingMarkingSplashes, Rain, WashingSwimming, SnorkelingScuba Diving
I(No Marking)NoNoNo
IIWATER RESISTANTYesNoNo
III50 M WATER RESISTANTYesYesNo
IV100 M WATER RESISTANTYesYesYes
V200 M WATER RESISTANTYesYesYes (excluding depths requiring helium-oxygen mixture)

Notes:

  • Strong friction on fluorescent paint may transfer it to other surfaces.
  • Condensation may form inside the glass due to rapid temperature changes. This is normal and not a defect.

CASIO COMPUTER CO., LTD. is not responsible for any damage arising from the use of these watches.

Watch Care

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

The gasket protecting against water and dust should be replaced every 2-3 years.

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

Setting the Current Time

  1. Pull the crown out to the second click. The second hand will stop at the 12 o'clock position.
  2. Turn the crown clockwise to set the current time.
  3. Return the crown to its normal position.

Setting the Current Day

  1. Pull the crown out to the first click.
  2. Turn the crown counter-clockwise to set the current day.
  3. Return the crown to its normal position.

Caution: Do not set the day between 9 PM and 1 AM. This may cause the day to change incorrectly.

Diagram Description: The diagram shows the watch crown with three positions: normal (for winding), first click (for date setting), and second click (for time setting). It also labels the hour hand, minute hand, second hand, and date window.

Product Information

Name: Electronic / Electro-mechanical Quartz Wristwatch (Men's/Women's)

Brand: CASIO

Manufacturer: CASIO COMPUTER Co., Ltd.

Manufacturer Address: 1-6-2, Hon-machi 1-chome, Shibuya-ku, Tokyo 151-8543, Japan

Importer: OOO "Casio", Russia

Warranty Period: 1 year

Address for Claims: See warranty card.

Using the Stopwatch

This watch measures elapsed time up to 11 hours, 59 minutes, and 59 seconds.

Do not operate the stopwatch with the crown pulled out.

  1. Press button [A] to start the stopwatch.
  2. Press button [A] again to stop the stopwatch. You can resume timing by pressing [A] again.
  3. The 1/20 second hand indicates measured values for the first 30 seconds of measurement.
  4. Press button [B] to reset the stopwatch. To return the 1/20 second hand to its current time position, press button [B] again.

Some models feature a rotating bezel. Align the bezel marker with the minute hand to measure elapsed time. The minute hand will then indicate the elapsed time on the bezel.

Synchronizing Stopwatch Hands

Frequent stopwatch use may cause the watch hands and stopwatch hands to become unsynchronized. To reset them:

  1. Press button [B] to reset the stopwatch.
  2. Pull the crown out to the second click.
  3. Press button [A] repeatedly to move the stopwatch second hand to the 12 o'clock position.
  4. Press button [B].
  5. If the 1/20 second hand is not at the 12 o'clock position, press button [B] again to synchronize it.
  6. Return the crown to its normal position after synchronization.

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4369

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