Casio 5104 JA Manual Download Page 1

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Congratulations on your purchase of this CASIO Quartz Watch.
Although highly sophisticated, this watch is delightfully simple to 
use, and by referring to this guide you will enjoy all the features of 
this reliable ultra-precise timepiece.

•  Be sure to keep all user documentation handy for future 

reference. 

•  Your watch may differ somewhat from the one shown in the 

illustration. 

Setting the Time and Day

Hour hand

Second hand

Day

Minute hand

First click

(Setting day)

Second click

(Setting time)

Crown

(Normal position)

To set the time

1.

 

Pull the crown out to the second click when the second hand is at 12 

o’clock position.

2.

 

Set the hands by rotating the crown. Rotate the crown to move the 

hands clockwise. Move the minute hand four or five minutes past the 
time you want to set, and then back it up to the proper setting.

  Carefully set the time, making sure to distinguish between AM and 

PM.

3.

 

Push the crown back in to the normal position to restart timekeeping.

To set the day

1.

 

Pull the crown out to the first click.

2.

 

Set the day by rotating the crown towards you.

3.

 

Push the crown back in to the normal position.

  Avoid changing the date setting while the current time is between 9:00 

p.m. and 1:00 a.m. 

•  Some water resistant models are equipped 

with a screw lock crown. 

•  With such models, you must unscrew the 

crown in the direction noted in the illustration 
to loosen it before you can pull it out. Do not 
pull too forcibly on such crowns. 

•  Also note that such watches are not water 

resistant while their crowns are loosened. 

Be sure to screw the crowns back in as far 
as they will go after making any setting.

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 The watch attached with a bezel can measure the elapsed time. 

Align the 

t

 mark on the bezel with the minute hand by turning it so 

that the time elapsed from the 

t

 mark can be measured.

Start

Elapsed

time

Specifications

Liquid crystal operating frequency:

 32,768Hz

Display:

 Analog display with hands

Drive:

 Step motor

Accuracy at normal temperature:

 

± 20 seconds a month

Battery:

 

One silver oxide battery (Type: SR621SW)

 

 

Approximately 3 years on type SR621SW

Warnings and precautions that appear in the documentation for this product 
and, in some cases, on the display of the product itself are indicated by 
graphic symbols. These symbols are intended to ensure safe and correct 
operation, and to protect you and others against injury and loss. The following 
shows samples of the graphic symbols and describes what each of them 
means.

Examples

A figure enclosed within a triangle indicates a matter that deserves 
caution. The example shown here warns against electrical shock.

A figure enclosed within a circle with a line running diagonally 

through it indicates something you should not do. The example 
shown here indicates that you must never disassemble the product

A figure enclosed within a black circle indicates something you must 

do. The example shown here indicates that you must unplug the 
product from the AC power outlet.

 Danger

This symbol indicates information that, if ignored or 
applied incorrectly, creates the danger of death or serious 
personal injury.

 Warning

This symbol alerts you to precautions about matters 

that, if ignored, could possibly put you at risk of serious 

personal injury or even death.

 Caution

This symbol alerts you to precautions about matters that, 
if ignored, could possibly cause material damage or put 

you at risk of serious personal injury.

 Warning

This product is not a diver’s watch. Never use it while 

scuba diving with air tanks. Doing so creates the risk of 

personal injury.

Battery Handling

Take care to ensure that the button-type battery used to power this product 
is not accidentally swallowed. Be especially careful to keep the battery out 

of the reach of small children.
Keep the battery in a place where they cannot be found by small children. If 
the battery is accidentally swallowed, consult with a physician immediately.

 Caution

Rash

The watch case and band come into direct contact with the skin, so certain 

conditions can cause a rash that may indicate one or more of the followings.

  Allergic reaction against the metal or leather

  Dirt, rust, sweat, or other foreign matter on the watch case or band

  Sickness or other physical abnormality

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 Tightening the band too snugly can cause sweating and interfere with the 

normal passage of air. Be sure to allow some space between the watch 
and band, and your skin.

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 The anti-bacterial odor band inhibits the formation of odor-causing bac-

teria caused by sweat and other agents. It does not necessarily protect 
against rash.

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 Be sure to see your physician immediately whenever you notice any skin 

abnormality.

 Caution

Using the watch

Make sure you are in a safe place before reading the display of the watch. 
Be especially careful to avoid causing accident or injury to yourself or others 

around you when reading the display while running or jogging along or near 
a roadway, or operating a bicycle, motorcycle, automobile, or other vehicle.
If the watch stops running, have the battery replaced as soon as possible.

Do not try to fasten or unfasten the buckle using your fingernail. Doing so 
can cause your fingernail to break or become injured. This is especially true 
for people with long fingernails.
Be sure to remove the watch before sleeping. Leaving it on while sleeping 
creates the risk of accidental injury to yourself or allergic reaction.
Take off the watch whenever handling or coming into contact with small 
children. Leaving it on creates the risk of accidental injury to a child or 
allergic reaction of a child’s skin.

Cleaning

A dirty watch case or band can cause soiling of the cuffs and sleeves of 

your clothing. Be sure to take steps to keep the watch case and band clean. 
Take special care to rinse off seawater and allow the watch and band to 

thoroughly dry before using them again.

Do not try to take this product apart.

Never try to take this product apart. Doing so creates the risk of 

personal injury and damage to the product.

Important Safety Precautions

Water Resistance

  The following applies to watches with WATER RESIST or WATER RESISTANT marked on 

• 

the back cover.

Water 

Resistance 

Under 

Daily Use

Enhanced Water Resistance Under Daily Use

5

Atmospheres

10

Atmospheres

20

Atmospheres

Marking

On watch front or on back 

cover

No

BAR mark

5BAR

10BAR

20BAR

Example of 

Daily Use

Hand washing, rain

Yes

Yes

Yes

Yes

Water-related work, swimming

No

Yes

Yes

Yes

Windsurfing

No

No

Yes

Yes

Skin diving

No

No

Yes

Yes

 Do not use this watch for scuba diving or other types of diving that requires air tanks.

• 

  Watches that do not have WATER RESIST or WATER RESISTANT marked on the back cover 

• 

are not protected against the effects of sweat. Avoid using such a watch under conditions 
where it will be exposed to large amounts of sweat or moisture, or to direct splashing with 
water.

  Even if a watch is water-resistant, do not operate its buttons or crown while it is submersed 

• 

in water or wet.

  Even if a watch is water-resistant, avoid wearing it in the bath or in areas where detergents 

• 

(soap, shampoo, etc.) are being used. Such conditions can reduce water resistance.

  After submersion in seawater, use plain water to rinse all salt and dirt from the watch.

• 

  In order to maintain water resistance, have the gaskets of your watch replace periodically 

• 

(about once every two or three years).

  A trained technician will know how to check your watch for proper water resistance whenever 

• 

you have its battery replaced. Battery replacement requires the use of special tools. Always 
request battery replacement from your original retailer or from an authorized CASIO Service 
Center.

  Some  water-resistant  watches  come  with  fashionable  leather  bands.  Avoid  swimming, 

• 

washing, or any other activity that causes direct exposure of a leather band to water.

  The inside surface of the watch glass may fog when the watch is exposed to a sudden 

• 

drop in temperature. No problem is indicated if the fogging clears up relatively quickly. If 
the fogging does not clear or if water has gotten into the watch, take the watch in for repair 
immediately.

  Continued  use  of  the  watch  with  water  inside  can  result  in  damage  to  electronic  and 

• 

mechanical components, the face of the watch, etc.

Band

  Tightening the band too tightly can cause you to sweat and make it hard for air to pass under 

• 

the band, which can lead to skin irritation. Do not fasten the band too tightly. There should 
be enough room between the band and your wrist so you can insert your finger.

  Deterioration, rust, or corrosion of the band can cause it to break, which may result in the 

• 

watch falling off your wrist and becoming lost. Be sure to take good care of the band and 
keep it clean. Should you notice any breakage, discoloration, looseness or other problem 
with the band, immediately contact your original retailer or an authorized CASIO Service 
Center to have it checked, repaired, or replaced. Note that you will be charged for any repair 
or replacement of the band.

Temperature

  Never leave the watch on the dashboard of a car, near a heater, or in any other location 

• 

that is subject to very high temperatures. Do not leave the watch where it will be exposed to 
very low temperatures, either. Temperature extremes can cause the watch to lose or gain 
time, to stop, or otherwise malfunction.

Impact

  Your watch is designed to withstand impact incurred during normal daily use and light activity 

• 

such as playing catch, tennis, etc. Dropping the watch or otherwise subjecting it to strong 
impact, however, can lead to malfunction.

  Note that watches with shock-resistant designs (G-SHOCK, Baby-G, G-ms) can be worn 

while operating a chain saw or engaging in other activities that generate strong vibration, 
or while engage in strenuous sports activities (motocross, etc.).

Magnetism

  The  hands  of  analog  and  combination  (analog-digital)  watches  are  moved  by  a  motor 

• 

that  uses  magnetic  force.  When  such  a  watch  is  close  to  a  device  (audio  speakers, 
magnetic  necklace,  cell  phone,  etc.)  that  emits  strong  magnetism,  the  magnetism  can 
cause timekeeping to slow down, speed up, or stop, resulting in the incorrect time being 
displayed.

Electrostatic Charge

  Exposure to very strong electrostatic charge can cause the watch to display the wrong time. 

• 

Very strong electrostatic charge even can damage electronic components.

Chemicals

  Do not allow the watch to come into contact with thinner, gasoline, solvents, oils, or fats, or 

• 

with any cleaners, adhesives, paints, medicines, or cosmetics that contain such ingredients. 
Doing so can cause discoloration of or damage to the case, resin band, leather band, and 
other parts.

Storage

  If you do not plan to use the watch for a long time, wipe it thoroughly free of all dirt, sweat, 

• 

and moisture, and store it in a cool, dry place.

Resin Components

  Allowing the watch to remain in contact with other items or storing it together with other 

• 

items for long periods while it is wet can cause the color of the other items to transfer to the 
resin components of the watch. Be sure to dry off the watch thoroughly before storing it and 
make sure it is not in contact with other items.

  Leaving the watch where it is exposed to direct sunlight (ultraviolet rays) for long periods or 

• 

failure to clean dirt from the watch for long periods can cause it to become discolored.

  Friction caused by certain conditions (frequent external force, sustained rubbing, impact, 

• 

etc.) can cause discoloration of painted components.

  If  there  are  printed  figures  on  the  band,  strong  rubbing  of  the  printed  area  can  cause 

• 

discoloration.

  Failure to clean dirt from the watch for long periods can cause fluorescent color to fade. 

• 

Wash dirt off with water as soon as possible and then dry the watch.

Operating Precautions

  Semi-transparent resin parts can become discolored due to sweat and dirt, and if exposed 

• 

to high temperatures for long periods.

  Contact an authorized CASIO Service Center to have resin components replaced. Note that 

• 

you will be charged for replacement costs.

Natural Leather and Imitation Leather Bands

  Allowing the watch to remain in contact with other items or storing it together with other 

• 

items while it is wet for long periods can cause the color of the other items to transfer to the 
natural leather or imitation leather band of the watch. Be sure to dry off the watch thoroughly 
before storing it and make sure it is not in contact with other items.

  Leaving  a  leather  band  where  it  is  exposed  to  direct  sunlight  (ultraviolet  rays)  for  long 

• 

periods or failure to clean dirt from a leather band for long periods can cause it to become 
discolored.

Important!

  Subjecting  a  natural  leather  or  imitation  leather  band  to  rubbing  or  dirt  can  cause  color 

• 

transfer and discoloration.

Metal Components

  Failure to clean dirt from a metal band can lead to formation of rust, even if the band is 

• 

stainless steel or plated. If the watch is exposed to sweat or water, wipe it thoroughly with 
a soft, absorbent cloth and then store it in a well-ventilated location to dry.

  To clean the band, use a soft toothbrush or similar tool to scrub it with a weak solution of 

• 

water and a mild neutral detergent. Take care to avoid getting solution on the watch case.

Bacteria and Odor Resistant Band

  The bacteria and odor resistant band protects against odor generated by the formation of 

• 

bacteria from sweat, which ensures good comfort and hygiene. In order to ensure maximum 
bacteria and odor resistance, keep the band clean. Use an absorbent soft cloth to wipe the 
band clean of dirt, sweat, and moisture. The bacteria and odor resistant band suppresses 
the formation of organisms and bacteria. It does not protect against rash due to allergic 
reaction, etc.

Note  that  CASIO  COMPUTER  CO.,  LTD.  assumes  no  responsibility  for  any  damage 
or loss suffered by you or any third party arising through the use of this product or its 
malfunction.

User Maintenance

Caring for Your Watch

  A dirty or rusty case or band can soil the sleeve of your clothing, cause skin irritation, and even 

• 

interfere with watch performance. Be sure to keep the case and band clean at all times. Rust 
tends to form easily after the watch is exposed to seawater and then left without cleaning.

  Sometimes a smudge like pattern may appear on the surface of a resin band. This will not 

• 

have any affect on your skin or clothing. Wipe the band with a cloth to clean it.

  Keep a leather band clean by wiping it with a dry cloth. Both resin bands and leather band 

• 

can become worn and cracked over time when subjected to normal daily use.

  Should your band become badly cracked or worn, be sure to have it replaced with a new 

• 

one. Request band replacement from your original retailer or an authorized CASIO Service 
Center. Note that you will be charged for band replacement costs, even if your watch is still 
covered by its warranty.

  Remember that you wear your watch next to your skin, just like a piece of clothing. Because 

• 

of this, you should always keep your watch clean. Use a soft, absorbent cloth to wipe off 
any dirt, sweat, water, or other foreign matter from the case and band.

Dangers of Poor Watch Care

Rust

  Though the stainless steel used for the watch is highly rust-resistant, rust can form if the 

• 

watch is not cleaned after it becomes dirty. Failure of oxygen to come into contact with the 
metal because it is dirty causes breakdown of the oxidization layer on the metal surface, 
which leads to the formation of rust.

  Even if the surface of the metal appears clean, sweat and rust in crevasses can soil the 

• 

sleeves of clothing, cause skin irritation, and even interfere with watch performance.

Premature Wear

  Leaving sweat or water on a resin band or storing it an area subject to high moisture can 

• 

lead to premature wear, cuts, and breaks.

Skin Irritation

  Individuals with sensitive skin or in poor physical condition may experience skin irritation when 

• 

wearing a watch. Such individuals should keep their leather band or resin band particularly 
clean, or switch to a metal band. Should you ever experience a rash or other skin irritation, 
immediately remove the watch and contact a skin care professional.

Battery Replacement

  Leave  battery  replacement  up  to  your  original  retailer  or  authorized  CASIO  Service 

• 

Center.

  Have the battery replaced only with the type specified by in this manual. Use of another type 

• 

of battery can cause malfunction.

  When replacing the battery, also request a check for proper water resistance. Note that you 

• 

will be charged separately for water resistance inspection.

Initial Battery

  The battery that comes loaded in your watch when you purchase it is used for function and 

• 

performance testing at the factory.

  This type of test battery may go dead quicker than the normally rated battery life as noted 

• 

in the User’s Guide. Note that you will be charged for replacement of this battery, even if 
replacement is required within the watch’s warranty period.

Low Battery Power

  Low battery power is indicated by large timekeeping error, when display contents are dim, 

• 

or when the display does blank.

  Operation while battery power is low can result in malfunction. Replace the battery as soon 

• 

as possible.

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