Casio MTP-RS105M-3BV User manual

© 2023 CASIO COMPUTER CO., LTD.
MA2304-A
User’s Guide
Watch
5727 EN
Congratulations upon your selection of this CASIO watch.
To ensure that this watch provides you with the years of service for which it is designed,
carefully read and follow the instructions in this manual, especially the information under
“Operating Precautions” and “User Maintenance”.
•Your watch may differ somewhat from the one shown in the illustration.
Before Using the Watch for the First Time
Crown
Spacer
•Depending on your watch model, there may be a spacer installed
at the factory around the crown. If your watch has a spacer, you
should remove the spacer before using the watch.
•After removing the spacer, use the procedures in “Crown
Operations” and “To adjust the time setting” to set up the watch
for use.
Charging the Watch
When you are not wearing the watch, leave it where its face
(solar cell) is exposed to bright light for charging.
To help ensure stable operation, expose the face of the watch
to about a half day of direct sunlight each month to charge it.
YES NO While wearing the watch, take care so your sleeve does not
block its face (solar cell) from light. Charging efficiency may
be reduced if the face (solar cell) is blocked from light, even
partially.
Warning!
Some light sources and environments can cause the watch to become extremely
hot during charging, which creates the risk of burn injury and damage to internal
watch components.
Avoid charging the watch under conditions like the ones described below, where
the temperatures may exceed 60°C (140°F).
•On the dashboard of a vehicle parked in the sun
•Near incandescent lamps, camera lights, halogen lamps, or other sources of heat
•In locations exposed to direct sunlight for long periods and other hot locations
Low Charge and Dead Battery Conditions
An alert operation is performed when the battery charge goes low.
Low Battery Alert
The second hand will jump at two-second intervals to alert you when the charge is low.
2-second jump
Low charge
Regular Timekeeping Low Battery Alert
Charged
Charging Time
The times below are general guidelines for reference only.
Charging Time to Support Daily Use
Exposure Level (Brightness) Approximate Charging Time
Outdoor sunlight (50,000 lux) 9 minutes
Sunlight through a window (10,000 lux) 17 minutes
Daylight through a window on an overcast day (5,000 lux) 35 minutes
Indoor fluorescent lighting (500 lux) 8 hours
Charging Time to Recover from Dead Battery
Exposure Level (Brightness)
Approximate
Charging Time to
1-second Hand
Movement
Approximate Time to
Full Charge
Outdoor sunlight (50,000 lux) 2.5 hours 25 hours
Sunlight through a window (10,000 lux) 4 hours 60 hours
Daylight through a window on an overcast
day (5,000 lux) 8 hours 110 hours
Indoor fluorescent lighting (500 lux) 110 hours – – –
Note
•Actual charging time depends on environmental conditions.
Quick Start
Timekeeping will stop if rechargeable battery power drops to zero. However, Quick Start
will resume timekeeping after the watch is exposed to light for a little while.
•Though timekeeping will resume virtually immediately, it will stop again if exposure to
light is stopped too soon.
•The actual amount of time it takes for timekeeping to resume after exposure to light
depends on the brightness of the light.

Using the Watch
Hour Hand
Second Hand
Minute Hand
Crown
Crown Operations
Some water-resistant models (10BAR, 20BAR) have a screw-in
crown. When you need to perform a crown operation, rotate
it towards you to unscrew it. Then pull the crown out. Avoid
applying undue force when pulling. The watch loses its water
resistance while the crown is unscrewed. After performing a
crown operation, fully screw the crown back in.
Crown
Loosen
If your watch has a rotary bezel...
You can rotate the bezel to align its ▼mark with the
minute hand. Then you will be able to tell how much
time has elapsed since aligning the ▼mark.
Start
Elapsed time
Current
To adjust the time setting
When the second hand is at 12 o’clock, pull
the Crown out.
Rotate the Crown to change the time setting.
Push the Crown back in on a time signal to
resume timekeeping.
Note
•When changing the time,
move the minute hand
four or five minutes past
your final setting, and then
back it up to the setting
you want.
Specifications
Accuracy at normal temperature: ±20 seconds a month
Power Supply: Solar cell and one rechargeable battery
Approximate battery operating time: 4 months
Other: Low battery alert
Specifications are subject to change without notice.

Operating Precautions
Water Resistance
•The information below 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 your 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, note the usage precautions described below. Such
types of use reduce water resistance performance and can cause fogging of the glass.
− Do not operate the crown or buttons while your watch is submersed in water or wet.
− Avoid wearing your watch while in the bath.
− Do not wear your watch while in a heated swimming pool, sauna, or any other high
temperature/high humidity environment.
− Do not wear your watch while washing your hands or face, while doing housework, or
while performing any other task that involves soaps or detergents.
•After submersion in seawater, use plain water to rinse all salt and dirt from your watch.
•To maintain water resistance, have the gaskets of your watch replaced periodically
(about once every two or three years).
•A trained technician will inspect 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.
Sudden and extreme temperature changes (such as coming into an air conditioned
room in the summer and standing close to an air conditioner outlet, or leaving a heated
room in the winter and allowing your watch to come into contact with snow) can cause
it to take longer for glass fogging to clear up. If glass fogging does not clear up or if you
notice moisture inside of the glass, immediately stop using your watch and take it to
your original retailer or to an authorized CASIO service center.
•Your water-resistant watch has been tested in accordance with International
Organization for Standardization regulations.
Band
•Tightening the band too tightly can cause you to sweat and make it difficult 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, and other conditions can cause the band to break or come off
of your watch, which in turn can cause band pins to fly out of position or to fall out.
This creates the risk of your watch falling from your wrist and becoming lost, and also
creates the risk of personal injury. Always take good care of your band and keep it
clean.
•Immediately stop using a band if you even notice any of the following: loss of band
flexibility, band cracks, band discoloration, band looseness, band connecting pin flying
or falling out, or any other abnormality. Take your watch to your original retailer or to
a CASIO service center for inspection and repair (for which you will be charged) or to
have the band replaced (for which you will be charged).
Temperature
•Never leave your 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 your watch where it will
be exposed to very low temperatures. Temperature extremes can cause your 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
during light activity such as playing catch, tennis, etc. Dropping your 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 engaging 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.
•Very strong magnetism (from medical equipment, etc.) should be avoided because it
can cause malfunction of your watch and damage to electronic components.
Electrostatic Charge
•Exposure to very strong electrostatic charge can cause your watch to display the wrong
time. Very strong electrostatic charge even can damage electronic components.
Chemicals
•Do not allow your 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 resin case, resin
band, leather, and other parts.
Storage
•If you do not plan to use your watch for a long time, thoroughly wipe it free of all dirt,
sweat, and moisture, and store it in a cool, dry place.
Resin Components
•Allowing your watch to remain in contact with other items or storing it together with
other items for long periods while it is wet can cause color on resin components
to transfer to the other items, or the color of the other items to transfer to the resin
components of your watch. Be sure to dry off your watch thoroughly before storing it
and make sure it is not in contact with other items.
•Leaving your watch where it is exposed to direct sunlight (ultraviolet rays) for long
periods or failure to clean dirt from your watch for long periods can cause it to become
discolored.
•Friction caused by certain conditions (strong 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.
•Leaving your watch wet for long periods can cause fluorescent color to fade. Wipe the
watch dry as soon as possible after it becomes wet.
•Semi-transparent resin parts can become discolored due to sweat and dirt, and if
exposed to high temperatures and humidity for long periods.
•Daily use and long-term storage of your watch can lead to deterioration, breaking,
or bending of resin components. The extent of such damage depends on usage
conditions and storage conditions.

CASIO COMPUTER CO., LTD.
6-2, Hon-machi 1-chome
Shibuya-ku, Tokyo 151-8543, Japan
Leather Band
•Allowing your 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 leather band to
transfer to the other items or the color of the other items to transfer to the leather band.
Be sure to dry off your watch thoroughly with a soft cloth 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.
CAUTION: Exposing a leather band to rubbing or dirt can cause color transfer and
discoloration.
Metal Components
•Failure to clean dirt from metal components can lead to formation of rust, even if
components are stainless steel or plated. If metal components exposed to sweat or
water, wipe thoroughly with a soft, absorbent cloth and then place the watch in a well-
ventilated location to dry.
•Use a soft toothbrush or similar tool to scrub the metal with a weak solution of water
and a mild neutral detergent, or with soapy water. Next, rinse with water to remove
all remaining detergent and then wipe dry with a soft absorbent cloth. When washing
metal components, wrap the watch case with kitchen plastic wrap so it does not come
into contact with the detergent or soap.
Bacteria and Odor Resistant Band
•The bacteria and odor resistant band protects against odor generated by the formation
of bacteria from sweat, which ensures comfort and hygiene. In order to ensure
maximum bacteria and odor resistance, keep the band clean. Use an absorbent soft
cloth to thoroughly wipe the band clean of dirt, sweat, and moisture. A 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 your watch or its
malfunction.
User Maintenance
Caring for Your Watch
Remember that you wear your watch next to your skin, just like a piece of clothing.
To ensure your watch performs at the level for which it is designed, keep it clean by
frequently wiping with a soft cloth to keep your watch and band free of dirt, sweat, water
and other foreign matter.
•Whenever your watch is exposed to sea water or mud, rinse it off with clean fresh
water.
•For a metal band or a resin band with metal parts, use a soft toothbrush or similar tool
to scrub the band with a weak solution of water and a mild neutral detergent, or with
soapy water. Next, rinse with water to remove all remaining detergent and then wipe
dry with a soft absorbent cloth. When washing the band, wrap the watch case with
kitchen plastic wrap so it does not come into contact with the detergent or soap.
•For a resin band, wash with water and then wipe dry with a soft cloth. Note that
sometimes a smudge like pattern may appear on the surface of a resin band. This will
not have any effect on your skin or clothing. Wipe with a cloth to remove the smudge
pattern.
•Clean water and sweat from a leather band by wiping with a soft cloth.
•Not operating a watch crown, buttons, or rotary bezel could lead to later problems with
their operation. Periodically rotate the crown and rotary bezel, and press buttons to
maintain proper operation.
Dangers of Poor Watch Care
Rust
•Though the metal steel used for your watch is highly rust-resistant, rust can form if your
watch is not cleaned after it becomes dirty.
− Dirt on your watch can make it impossible for oxygen to come into contact with the
metal, which can lead to breakdown of the oxidization layer on the metal surface and
the formation of rust.
•Rust can cause sharp areas on metal components and can cause band pins to fly out
of position or to fall out. If you ever notice any abnormality immediately stop using your
watch and take it to your original retailer or to an authorized CASIO service center.
•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 bezel, or storing your watch 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. Should you ever experience a rash or other skin irritation, immediately
remove your watch and contact a skin care professional.
Battery
•The special rechargeable battery used by your watch is not intended to be removed or
replaced by you. Use of a rechargeable battery other than the special one specified for
your watch can damage your watch.
•The rechargeable (secondary) battery is charged when the solar cell is exposed to
light, so it does not require regular replacement as the primary battery requires. Note,
however, that long use or operating conditions can cause the capacity or charging
efficiency of the rechargeable battery to deteriorate. If you feel that the amount of
operation provided by charging is too short, contact your original retailer or CASIO
service center.