Casio 2753 Operation Manual page 3

Operation Guide 2753 3333
Stopwatch
Mode indicator
The stopwatch lets you measure elapsed time, split times,
and two finishes.
• The display range of the stopwatch is 99 minutes, 59.99
seconds.
• The stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
• Exiting the Stopwatch Mode while a split time is frozen
Minutes
1/100 second
on the display clears the split time and returns to
Seconds
elapsed time measurement.
Module 2753
• The stopwatch measurement operation continues even
Mode if you exit the Stopwatch Mode.
• All of the operations in this section are performed in the
indicator
Stopwatch Mode, which you enter by pressing C.
Minutes Seconds
Module 3333
To measure times with the stopwatch
Elapsed Time
D ➤ D ➤ D
Start Stop Re-start
Split Time
D ➤ B ➤ B
Start Split Split release
Two Finishes
D ➤ B ➤ D
Start Split
Stop
First runner Second runner
finishes. finishes.
Display time of
first runner.
Illumination
The watch has an EL (electro-luminescent) panel that
Auto light switch
causes the entire display to glow for easy reading in the
indicator
dark. The watch's auto light switch automatically
illuminates the face when you angle the watch towards
your face.
• The auto light switch must be turned on (indicated by
the auto light switch indicator) for it to operate.
• See "Illumination Precautions" for other important
information.
To turn on illumination manually
In any mode, press L to illuminate the display for about
one second.
• The above operation turns on illumination regardless of
the current auto light switch setting.
About the Auto Light Switch
Turning on the auto light switch causes the display illumination to turn on for about one
second, whenever you position your wrist as described below in any mode. Note that
this watch features a "Full Auto EL Light," so the auto light switch operates only when
available light is below a certain level. It does not illuminate the display under bright
light.
Moving the watch to a position that is parallel to the ground and then tilting it
towards you more than 40 degrees causes illumination to turn on.
• Wear the watch on the outside of your wrist.
Parallel to
ground
Warning!
• Always make sure you are in a safe place whenever you are reading the
display of the watch using the auto light switch. Be especially careful when
running or engaged in any other activity that can result in accident or injury.
Also take care that sudden illumination by the auto light switch does not
surprise or distract others around you.
• When you are wearing the watch, make sure that its auto light switch is turned
off before riding on a bicycle, or operating a motorcycle or any other motor
vehicle. Sudden and unintended operation of the auto light switch can create a
distraction, which can result in a traffic accident and serious personal injury.
To turn the auto light switch on and off
In any mode, hold down L for about two seconds to toggle the auto light switch on
(the auto light switch indicator displayed) and off (the auto light switch indicator not
displayed).
• The auto light switch indicator is on the display in all modes while the auto light
switch is turned on.
Battery
This watch is equipped with a solar cell and a rechargeable battery (secondary
battery) that is charged by the electrical power produced by the solar cell. The
illustration shown below shows how you should position the watch for charging.
Example: Orient the watch so its face
is pointing at a light source.
• The illustration shows how to position
a watch with a resin band.
• Note that charging efficiency drops
when any part of the solar cell is
blocked by clothing, etc.
• Normally, you should try to keep the
watch outside of your sleeve as much
as possible. Charging is significantly
reduced if the face is only partially
covered.
Important!
• Storing the watch for long periods in an area where there is no light or wearing it in
such a way that it is blocked from exposure to light can cause rechargeable battery
power to run down. Make sure that the watch is normally exposed to bright light
whenever possible.
• Normally, the rechargeable battery should not need replacement, but after very long
use over a number of years, the rechargeable battery may lose its ability to achieve
a full charge. Should you notice problems with getting the rechargeable battery to a
full charge, contact your dealer or CASIO distributor about having it replaced.
• The rechargeable battery should be replaced with a CASIO-specified CTL1616
battery only. Other rechargeable batteries can cause damage to the watch.
• All data stored in memory is deleted, and the current time and all other settings
return to their initial factory defaults whenever battery power drops to Level 4 and
when you have the battery replaced.
• Turn on the watch's Power Saving function and keep it in an area normally exposed
to bright light when storing it for long periods. This helps to keep the rechargeable
battery from going dead.
Battery Power Indicator and Recover Indicator
The battery power indicator on the display shows you the current status of the
rechargeable battery's power.
B
➤ D ➤
Battery power indicator
Stop Clear
➤ D ➤ B
Stop Clear
B ➤ B
➤
Clear
Split release
Display time of
second runner.
• The flashing charge indicator (
low, and that exposure to bright light for charging is required as soon as possible.
• At Level 4, all functions are disabled and settings return to their initial factory
defaults. Functions are enabled once again after the rechargeable battery is
charged, but you need to set the time and date, after the battery reaches Level 3
(indicated by flashing charge indicator) from Level 4. You will not be able to set any
of the other settings until the battery reaches Level 2 (no charge indicator) after
dropping to Level 4.
• Leaving the watch in direct sunlight or some other very strong light source can
cause the battery power indicator to temporarily show a reading that is higher than
the actual battery level. The correct battery power indicator should appear after a
few minutes.
• If you use the light or alarms a number of times during a short period, the recover
indicator appears on the display and the following operations become disabled until
battery power recovers.
After some time, battery power will recover and the recover indicator will
disappear, indicating that the above functions are enabled again.
Charging Precautions
Certain charging conditions can cause the watch to become very hot. Avoid leaving
the watch in the areas described below whenever charging its rechargeable battery.
Also note that allowing the watch to become very hot can cause its liquid crystal
display to black out. The appearance of the LCD should become normal again when
the watch returns to a lower temperature.
Warning!
Leaving the watch in bright light to charge its rechargeable battery can cause it
to become quite hot. Take care when handling the watch to avoid burn injury.
The watch can become particularly hot when exposed to the following
conditions for long periods.
More than
• On the dashboard of a car parked in direct sunlight
40°
• Too close to an incandescent lamp
• Under direct sunlight
Charging Guide
After a full charge, timekeeping remains enabled for up to about 11 months.
• The following table shows the amount of time the watch needs to be exposed to light
each day in order to generate enough power for normal daily operations.
Exposure Level (Brightness)
Outdoor Sunlight (50,000 lux)
Sunlight Through a Window (10,000 lux)
Daylight Through a Window on a Cloudy Day
(5,000 lux)
Indoor Fluorescent Lighting (500 lux)
• Since these are the specs, we can include all the technical details.
• Stable operation is promoted by frequent charging.
Recovery Times
The table below shows the amount exposure that is required to take the battery from
one level to the next.
Exposure Level
(Brightness)
Solar cell
Outdoor Sunlight (50,000 lux)
Sunlight Through a Window
(10,000 lux)
Daylight Through a Window
on a Cloudy Day (5,000 lux)
Indoor Fluorescent Lighting
(500 lux)
• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
Level Battery Power
Indicator
1
2
3
Recover indicator
(Charge Soon Alert)
4
) at Level 3 tells you that battery power is very
Illumination
Beeper tone
Coordination between digital and analog timekeeping
• Display on 18 hours per day, sleep state 6 hours per day
• 1 illumination operation (1.5 seconds) per day
• 10 seconds of alarm operation per day
Approximate Exposure Time
Level 4
2 hours
8 hours
13 hours
157 hours
Function Status
All functions enabled.
All functions enabled.
Alarm, hourly time signal,
illumination, auto light switch,
and display are disabled.
Though the hands of the watch
do not move, time continues to
be kept internally.
All functions, including
timekeeping, disabled.
Approximate Exposure Time
6 minutes
30 minutes
48 minutes
8 hours
Level 3 Level 2 Level 1
38 hours 11 hours
192 hours 53 hours
– – –
– – –
3