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USER'S GUIDE 2535
1
If the display of the watch is blank...
If the SLEEP indicator is on the display, it means that the
display is blank because the watch's Power Saving
function has turned off the display to conserve power.
Power Saving automatically turns off the display and puts
the watch into a sleep state whenever your watch is left
for a certain period where it is dark.
· The initial factory default setting is Power Saving on.
· The watch recovers from the sleep state if you move it to
a well-lit area*, if you press any button, or if you angle
the watch towards your face for reading.
* It can take up to five seconds for the display to turn on.
· See "Power Saving Function" for more information.
About This Manual
· Button operations are indicated using the letters shown
in the illustration.
· Each section of this manual provides you with the
information you need to perform operations in each
mode. Further details and technical information can be
found in the "Reference" section.
(Light)
Getting Acquainted
Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to carefully read this manual and keep it on hand for later reference
when necessary.
Expose the watch to bright light to charge its battery before using it.
You can use this watch even as its battery is being charged by exposure to bright
light.
· Be sure to read "Battery" of this manual for important
information you need to know when exposing the watch to bright light.
Stopwatch Mode
L
Press C.
L
Dual Time Mode
Alam Mode
Countdown Timer Mode
Recall Mode
L
General Guide
· Press C to change from mode to mode.
· In any mode, press L to illuminate the display.
L
L
L
Timekeeping Mode
Timekeeping
Use the Timekeeping Mode to set and view the current
time and date.
To set the time and date
1. In the Timekeeping Mode, hold down B until the
seconds start to flash, which indicates the setting
screen.
2. Press C to move the flashing in the sequence shown
below to select other settings.
Hour : Minutes Seconds
Year
Day of week
Month ­ Day
PM indicator
Hour
Seconds
12/24-Hour
Format
Power Saving
Day
Month
Year
Minutes
4. Press B to exit the setting screen.
· See "Power Saving Function" for details about configuring Power Saving settings.
· The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
applied in all modes.
· The day of the week is automatically displayed in accordance with the date (year,
month, and day) settings.
Setting
Seconds
Hour, Minutes
12/24-Hour
Format
Year, Month, Day
Power Saving
Button Operation
Press D to reset to
00.
Use D (+) and A (­) to change the setting.
Press D to toggle between 12-hour (
12H) and
24-hour (
24H) timekeeping.
Use D (+) and A (­) to change the setting.
Press D to toggle Power Saving on (
ON) and
off (
OFF).
Screen
3. When the setting you want to change is flashing, use D and A to change it as
described below.
Stopwatch
The 1/100-second stopwatch can measure elapsed time
and lap/split times. The stopwatch uses the basic data you
input and a pacer signal to calculate the distance you
cover while jogging or running. Stopwatch times and your
distance are also stored in memory.
· The stopwatch measurement operation continues even
if you exit the Stopwatch Mode.
· Exiting the Stopwatch Mode while a lap/split time is
frozen on the display clears the lap/split time and returns
to elapsed time measurement.
· Stopwatch measurements are performed in the
Stopwatch Mode, which you enter by pressing C.
Timekeeping
Mode time
1/100 second
Seconds
Hours
Minutes
Remaining memory
How the Stopwatch Works
There are two ways you can use the stopwatch: to measure elapsed time and lap/split
times like a standard stopwatch (see "To measure times with the stopwatch"), and to
keep track of the distance you cover while jogging or running. In order to use the
stopwatch to keep track of distance, you must first perform the steps listed below.
1. Set your basic data. See "Basic Data".
2. Turn on the pacer signal. See "To turn the pacer signal on and off".
Note
· In order to obtain accurate distance calculations, you must set accurate basic data
and keep your exercise pace in accordance with the pacer signal emitted by the
watch.
· See "How Stopwatch Data is Stored" for information about the type of data the watch
stores in memory when you use the stopwatch.
· Use the Recall Mode to view data stored in memory.
· You can view distance covered data only by recalling it in the Recall Mode. It does
not appear on the Stopwatch Mode screen.
To measure times with the stopwatch
Note
· Pressing D to perform a lap/split time operation freezes the lap/split time at that
point on the display for about eight seconds. After that, the display returns to normal
stopwatch time measurement.
· During a stopwatch time measurement operation, the upper part of the display
shows the hour digit and the current lap/split number, the center part shows the
current split time, and the lower part shows the current lap time.
· When the pacer signal is turned on, it sounds for the first 30 seconds after you start
a stopwatch time measurement operation. After that, the pacer signal sounds for 30
seconds whenever you press B.
Clear
Next Lap/
Split
A
Start
Stop
Elapsed Time
Re-start
Clear
A
Stop
AA
D
Lap/Split Times
A
Start
Lap/Split
D
Stop
D
A
D
· If the pacer signal does not sound even though you have it turned on, press B to
change the positions of the lap time and split time on the display. This should cause
the pacer signal to sound.
Selecting the Stopwatch Screen Format
The following shows how you can control the position of the lap time and split time on
the stopwatch screen.
· The Lap/Split indicator uses arrows to indicate the location the lap time and split
(elapsed) time.
· When you first start a stopwatch operation by pressing A, both the center part and
the lower part of the display show minutes, seconds, and 1/100 second. Whenever
the time shown in the lower part of the display is greater than 60 minutes, the display
format changes to show hours, minutes, and seconds. Whenever the time in the
center part of the display is greater than 10 hours, the display format changes to
show hours, minutes, and seconds.
Lap/Split number
Split
time
Lap time
Split time
More than 10 hours
Press B.
Lap time
Hours
Minutes
Seconds
Lap/Split
indicator


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USER'S GUIDE 2535
2
Basic Data
The term "basic data" refers to the pacer signal setup, and information about your
stride length.
Important!
· You cannot change basic data settings while a Stopwatch Mode time measurement
operation is in progress. Stopwatch operation must be stopped and the Stopwatch
screen must be cleared to all zeros before you can change basic data settings.
· Whenever you want to change the stride length unit, you must first reset the
Cumulative Total screen to zero. See "To reset the cumulative total screen" for
information about how to do this.
· Be sure to update basic data values whenever the person using the watch changes.
Pacer Signal
The pacer signal of this watch beeps in accordance with a pacer value (rate) set by
you. You can use the pacer signal to maintain a constant pace while jogging or
running. You can also turn off the pacer signal when you do not want to use it.
· The pacer value you set specifies the number of beeps per minute.
· Turning on the pacer signal causes the watch to beep at the rate specified by the
pacer value.
· You can set a pacer value in the range of 100 to 200 beats per minute, in units of 5.
· You can disable the pacer function by setting a pacer value of xxx. While the pacer
value is set to
xxx, the watch does not calculate distance covered.
Stride Length
You can specify either centimeters (XM) or inches (Yn) as the stride length unit. The
unit you specify for the stride length unit also determines the unit of measurement
used for the distance value in the Stopwatch Mode and Recall Mode, as shown below.
· The following examples illustrate how you can calculate values for this setting.
239 steps required to run around a 300-meter track.
300 (meters)
÷ 239 (steps) = 1.255 (approximately 125 cm)
239 steps required to run around a 330-yard track.
330 (yards)
÷ 239 (steps) × 36 = 49.70 (approximately 50 inches)
Setting Range
40 to 190 cm
16 to 76 in
Setting Increment
5 cm
2 in
Distance Unit
Kilometers (km)
Miles (mi)
Stride Length Unit
Centimeters (XM)
Inches (Yn)
To configure your basic data
1. While the Stopwatch Mode screen shows all zeros
(0 H
00'00''00), hold down B until the pacer value
appears flashing on the display. This indicates the
setting screen.
2. Press C to move the flashing in the sequence shown
below to select other settings.
3. When the setting you want to change is flashing, use
D and A to change it as described below.
Stride length unit
Pacer value
Pacer signal
Stride length
Setting
Pacer value
Pacer signal
Stride length
Stride length unit
Screen
Button Operations
Use D (+) and A (­) to change the setting.
· Selecting xxx disables the pacer signal.
Press D to toggle the pacer signal on (
ON)
and off (
OFF).
Use D (+) and A (­) to change the setting.
Press D to toggle between centimeters (XM)
and inches (Yn).
· When the pacer signal is turned on, the pacer signal sounds in accordance with the
pacer value while the pacer signal or pacer value setting screen is on the display.
4. Press B to exit the setting screen.
· If you find that the stride length unit won't change reset the cumulative total to all
zeros.
To turn the pacer signal on and off
1. While the Stopwatch Mode screen shows all zeros
(0 H
00'00''00), hold down B until the pacer value
appears flashing on the display. This indicates the
setting screen.
2. Press C once to display the pacer signal setting
screen.
3. Press D to toggle the pacer signal on (
ON) and off
(
OFF).
· A pacer signal on indicator ( ) appears when this
setting it turned on.
4. Press B to exit the setting screen.
Recall Mode
Use the Recall Mode to recall and delete records stored
by the Stopwatch Mode.
· Stopwatch records are stored in "logs" that are created
automatically by the watch. See "Memory Management"
for more information.
· The title screen of the newest log appears first whenever
you enter the Recall Mode.
· Log numbers are automatically assigned in sequence,
starting from
01.
· All of the operations in this section are performed in the
Recall Mode, which you enter by pressing C.
To recall stopwatch records
In the Recall Mode, use B to scroll through the log title
screens, starting from the newest one, as shown below.
When the title screen of the log you want is displayed, use
D and A to cycle through the records contained in the log.
Distance covered
Log number
Creation date
(Month ­ Day)
Log Title Screen
· The cumulative total screen shows the total distance since the last cumulative total
distance reset.
Press A.
L
L
L
L
Press D.
Split time
Lap/Split number
BEST indicator
L
L
Cumulative Total Screen
L
Press B.
Log Title Screen
Stopwatch Record
Screen
Best Lap Time
Screen
Lap time
L
L
· The locations of the lap time and split time (middle or bottom of the display) in the
Stopwatch Record screen are determined by the display format you last selected in
the Stopwatch Mode.
· The BEST indicator identifies the record that contains the best lap time in the log.
· If a best lap time record is deleted automatically when the log becomes full, the
BEST indicator will not be transferred to the record with the next best lap time. See
"Memory Management" for more information about automatic deletion of records.
· The unit of measurement used for the distance calculation depends on the unit you
select for your stride length as shown in the table below. See "To configure your
basic data" for more information.
Selected Stride Unit
Distance Unit
XM (centimeters)
km (kilometers)
Yn (inches)
mi (miles)
To delete a log
1. In the Recall Mode, display the title screen of the log you want to delete.
· See "To reset the cumulative total screen" below for information about what
happens when you select the cumulative total screen here.
2. Hold down A and D until the watch beeps and
CLR stops flashing on the
display.
· This deletes the log and all the records inside it. Deleting a log does not change the
cumulative total distance value.
To reset the cumulative total screen
1. In the Recall Mode, display the cumulative total screen.
2. Hold down A and D until the watch beeps and
CLR stops flashing on the
display.
· This resets the cumulative total distance to zero, without deleting any logs or
records. A new cumulative total will start with the next stopwatch operation you
perform.
Countdown Timer
You can set the countdown timer within a range of one
minute to 100 hours. An alarm sounds when the
countdown reaches zero.
· You can also select auto-repeat, which automatically
restarts the countdown from the original value you set
whenever zero is reached.
· Countdown timer functions are available in the
Countdown Timer Mode, which you can enter using C.
To set the countdown start time
1. While the countdown start time is on the display in the
Countdown Timer Mode, hold down B until the hour
setting of the countdown start time starts to flash, which
indicates the setting screen.
Hours
Minutes
Seconds
Timekeeping Mode time
· If the countdown start time is not displayed, use the procedure under "To use the
countdown timer" to diplay it.
2. Press C to move the flashing between the hour and minute settings.
3. Use D (+) and A (­) to change the flashing item.
· To set the starting value of the countdown time to 100 hours, set 0:00.
4. Press B to exit the setting screen.
To use the countdown timer
Press A while in the Countdown Timer Mode to start the countdown timer.
· When the end of the countdown is reached and auto-repeat is turned off, the alarm
sounds for 10 seconds or until you stop it by pressing any button. The countdown
time is automatically reset to its starting value when the alarm sounds.
· Press A while a countdown operation is in progress to pause it. Press A again to
resume the countdown.
· To completely stop a countdown operation, first pause it (by pressing A), and then
press D. This returns the countdown time to its starting value.
To turn auto-repeat on and off
While the countdown start time is displayed on the
Countdown Timer Mode screen, hold down D for about
two seconds to toggle auto-repeat on (
displayed) and
off (
not displayed).
· When auto-repeat is turned on, the alarm sounds and
countdown starts again whenever the countdown
reaches zero. You can stop the countdown by pressing
A, and manually reset to the countdown start time by
pressing D.
· Auto-repeat timing repeats up to seven times.


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USER'S GUIDE 2535
3
Alarms
You can set five independent Daily Alarms. When an
alarm is turned on, the alarm tone sounds when the alarm
time is reached. One of the alarms can be configured as a
snooze alarm or a one-time alarm, while the other four are
one-time alarms.
You can also turn on an Hourly Time Signal that causes
the watch to beep twice every hour on the hour, and a
brightness alarm that beeps whenever the watch is moved
from an area where it is dark to an area where it is light.
· There are five alarm screens numbered 1 through 5.
The hourly time signal screen is indicated by
:00. The
brightness alarm screen shows
ON or OFF.
· All of the operations in this section are performed in the
Alarm Mode, which you enter by pressing C.
Alarm number
Alarm time
(Hour : Minutes)
Timekeeping Mode time
To set an alarm time
1. In the Alarm Mode, use D to scroll through the alarm
screens until the one whose time you want to set is
displayed.
· You can configure Alarm 1 as a snooze alarm or a one-time alarm. Alarms 2
through
5 can be used as one-time alarms only.
· The snooze alarm repeats every five minutes.
2. After you select an alarm, hold down B until the hour setting of the alarm time
starts to flash. This indicates the setting screen.
3. Press C to move the flashing between the hour and minute settings.
4. While a setting is flashing, use D (+) and A (­) to change it.
· When setting the alarm time using the 12-hour format, take care to set the time
correctly as a.m. (no indicator) or p.m. (P indicator).
5. Press B to exit the setting screen.
Alarm Operation
The alarm sounds at the preset time for about 10 seconds. In the case of the snooze
alarm, the alarm operation is performed a total of seven times, every five minutes, until
you turn the alarm off or change it to a one-time alarm.
The watch also has a brightness alarm. When turned on, the brightness alarm causes
the watch to beep for 10 seconds when the watch is brought from the dark into the
light. The following are the conditions for brightness alarm operation.
· The watch needs to be in the dark for about 30 to 35 minutes for the brightness
alarm to become activated.
· The brightness alarm sounds about 15 to 20 minutes after the watch is next exposed
to light.
· The brightness alarm sounds only once and then turns off automatically.
Note
· Pressing any button stops the alarm tone operation.
· Performing any one of the following operations during a 5-minute interval between
snooze alarms cancels the current snooze alarm operation.
Displaying the Timekeeping Mode setting screen
Displaying the Alarm
1 setting screen
To test the alarm
In the Alarm Mode, hold down D to sound the alarm.
x3
x4
x1
x2
:00
x5
ON or OFF
To turn Alarms
2
2
2
2
2 through 5
5
5
5
5 on and off
1. In the Alarm Mode, use D to select a one-time alarm
(alarm number
2 through 5).
2. Press A to toggle the displayed alarm on and off.
· Turning on a one-time alarm (2 through 5) displays the
one-time alarm on indicator (ALM) on its screen.
· The one-time alarm on indicator is displayed in all
modes.
· If any alarm is on, the alarm on indicator is shown on
the display in all modes.
One-time alarm
on indicator
To select the operation of Alarm
1
1
1
1
1
1. In the Alarm Mode, use D to select Alarm
1.
2. Press A to cycle through the available settings in the sequence shown below.
· The applicable alarm on indicator (ALM or SNZ ALM) is displayed in all modes
when an alarm is turned on.
· The SNZ indicator flashes during the 5-minute intervals between alarms.
· Displaying the Alarm 1 setting screen while the snooze alarm is turned on
automatically turns off the snooze alarm (making Alarm
1 a one-time alarm).
SNZ ALM
ALM
SNZ indicator and one-time alarm on indicator
One-time alarm on
Snooze alarm on
Alarm off
To turn the hourly time signal and the brightness alarm on and off
1. In the Alarm Mode, use D to select the Hourly Time
Signal or the brightness alarm.
2. Press A to toggle the displayed item on and off.
· Turning on the Hourly Time Signal displays the hourly
time signal on indicator (SIG) on its screen.
· Turning on the brightness alarm displays the brightness
alarm on indicator (BRT) on its screen.
· The hourly time signal on indicator and brightness alarm
on indicator are displayed in all modes.
Hourly time signal
on indicator
Brightness alarm on indicator
Dual Time
The Dual Time Mode lets you keep track of time in a
different time zone.
· The seconds count of the Dual Time is synchronized
with the seconds count of the Timekeeping Mode.
To set the Dual Time
1. Press C to enter the Dual Time Mode.
2. Use A, B, and D to set the Dual Time Mode time.
· Each press of D (+) and A (­) changes the time
setting in 30-minute increments.
· Pressing B sets the Dual Time Mode to the same time
as the Timekeeping Mode.
Dual time
(Hour : Minutes Seconds)
Timekeeping Mode time
Backlight
The backlight uses an EL (electro-luminescent) panel that
causes the entire display to glow for easy reading in the
dark. The watch's auto light switch automatically turns on
the backlight when you angle the watch towards your face.
· The auto light switch must be turned on (indicated by
the auto light switch on indicator) for it to operate.
· See "Backlight Precautions" for other important
information about using the backlight.
To turn on the backlight manually
In any mode, press L to illuminate the display for about
one second.
· The above operation turns on the backlight regardless of
the current auto light switch setting.
Auto light switch
on indicator
About the Auto Light Switch
Turning on the auto light switch causes the backlight 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 turn on the backlight 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 the backlight to turn on.
Parallel to
ground
More than
40
°
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 the Timekeeping Mode, hold down D for about two seconds to toggle the auto light
switch on (AUTO EL displayed) and off (AUTO EL not displayed).
· The auto light switch on indicator (AUTO EL) 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.
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. Be sure that the watch is normally exposed to bright light
whenever possible.
· This watch employs a solar cell that converts light into electricity, which charges a
built-in rechargeable battery. 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 the rechargeable battery 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 5 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.
Example: Orient the watch so its
face is pointing at a light source.
· Note that charging efficiency drops
when any part of the solar cell is
blocked by clothing, etc.
· The illustration shows how to
position a watch with a resin band.
Solar cell


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USER'S GUIDE 2535
4
Battery Power Indicator
The battery power indicator on the display shows you the current status of the
rechargeable battery's power.
Level
1
2
3
4
5
Battery Power
Indicator
l l l
ll
ll
ll
l l
l
(Charge Soon Alert)
Function Status
All functions enabled.
All functions enabled.
All functions enabled.
Beeper tone, backlight,
display, and buttons are
disabled.
All functions, including
timekeeping, are disabled.
Battery power indicator
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.
· On the dashboard of a car parked in direct sunlight
· Too close to an incandescent lamp
· Under direct sunlight
Charging Guide
After a full charge, timekeeping remains enabled for up to about nine months, while
the watch is used under the conditions described below.
Operating Conditions
· Watch is not exposed to light
· Display on 18 hours per day, sleep state 6 hours per day
· 1 backlight operation (1.5 seconds) per day
· 10 seconds of alarm operation per day
· One minute of stopwatch operation with pacer signal (pacer value: 120) every two
days
· 1 countdown timer operation per day
Charge Times
Exposing the watch to light for the periods shown below each day restores the power
used by the above operating conditions.
· Stable operation is promoted by frequent charging.
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)
Approximate Exposure Time
5 minutes
24 minutes
48 minutes
8 hours
Recovery Times
The table below shows the amount exposure that is required to take the battery from
one level to the next.
· The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
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)
Approximate Exposure Time
Level 5
Level 4
Level 3
Level 2
Level 1
L
L
L
65 minutes
4 hours
7 hours
60 hours
18 hours
98 hours
4 hours
19 hours
­ ­ ­
­ ­ ­
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Power Saving Function
When turned on, the Power Saving function automatically
puts the watch into a sleep state whenever it is left in an
area where it is dark for 30 to 35 minutes. The sleep state
is indicated by a blank screen with SLEEP flashing on it.
In the sleep state, all functions are enabled, except for the
display.
· Wearing watch inside the sleeve of clothing can cause it
to enter the sleep state.
To recover from the sleep state
Perform any one of the following operations.
· Move the watch to a well-lit area. It can take up to five seconds for the display to turn
on.
· Press any button.
· Angle the watch towards your face for reading.
To turn Power Saving on and off
1. In the Timekeeping Mode, hold down B until the
seconds start to flash, which indicates the setting
screen.
2. Press C seven times until the Power Saving on/off
screen appears.
3. Press D to toggle Power Saving on (
ON) and off
(
OFF).
4. Press B to exit the setting screen.
· The Power Saving on indicator (SAVE) is on the display
in all modes while the Power Saving is turned on.
Auto Return Feature
If you leave a screen with flashing digits on the display for two or three minutes without
performing any operation, the watch automatically saves any settings you have made
up to that point and exits the setting screen.
Initial Screens
When you enter the Alarm Mode, the screen you were viewing when you last exited
the mode appears first.
Data and Setting Scrolling
The A and D buttons are used in various modes and setting screens to scroll
through data on the display. In most cases, holding down these buttons during a scroll
operation scrolls through the data at high speed.
Timekeeping
· Resetting the seconds to 00 while the current count is in the range of 30 to 59
causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are
reset to
00 without changing the minutes.
· With the 12-hour format, the P (PM) indicator appears on the display for times in the
range of noon to 11:59 p.m. and no indicator appears for times in the range of
midnight to 11:59 a.m.
· With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without
any indicator.
· The year can be set in the range of 2000 to 2039.
· The watch's built-in full automatic calendar automatically makes allowances for
different month lengths and leap years. Once you set the date, there should be no
reason to change it except when battery power drops to Level 5.
Stopwatch
· You can use lap time measurement to time how long it takes to complete a specific
portion (such as a single lap) of a race.
· You can use split time measurement to time how long it takes to get from the start to
a specific point in a race.
Memory Management
Each time you press A to start a new elapsed time or lap/split operation in the
Stopwatch Mode, the watch automatically creates a new "log" in its memory. The log
remains open for data storage until you permanently close it by pressing D to clear
the stopwatch to all zeros.
· The watch has enough memory to hold up to 61 records. Since each log title screen
uses up one record of memory space, the maximum number of lap/split time records
you can store depends on how many logs there are currently in memory, as shown
below.
· The watch also calculates the cumulative total distance for all stopwatch operations
since the last time the cumulative total distance was reset. The cumulative total does
not affect memory capacity.
· If watch memory is already full when you perform a stopwatch button operation that
creates a new log, the oldest log in memory and all of its records are deleted
automatically to make room for the new log.
· If you are adding records to the only log in memory and watch memory becomes
full, adding another record causes the oldest record in the log to be deleted
automatically to make room for the new record.
· If you are adding records to a log when there are multiple logs in memory and watch
memory becomes full, adding another record causes the oldest log in memory and
all of its records to be deleted automatically to make room for new records.
Number of Logs
Currently in Memory
1
2
5
Memory Capacity
61 Records
Lap/Split Time Record Capacity
61 records ­ 1 log title screen = 60
61 records ­ 2 log title screens = 59
61 records ­ 5 log title screens = 56
· The flashing
indicator at Level 4 tells you that battery power is very low, and that
exposure to bright light for charging is required as soon as possible.
· At Level 5, 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 current time, date, and all other settings after the
battery is recharged to Level 3 from Level 5. Though the time appears on the display
after the battery is charged to Level 4, you will not be able to change the time setting
until the battery reaches Level 3.
· 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 backlight or any of the alarm functions a number of times during a
short period, RECOVER appears on the display and the following operations
become disabled until battery power recovers.
Backlight
Beeper tone
After some time, battery power will recover and RECOVER will disappear, indicating
that the above functions are enabled again.


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USER'S GUIDE 2535
5
· The backlight may not light if the face of the watch is
more than 15 degrees above or below parallel. Make
sure that the back of your hand is parallel to the ground.
· The backlight turns off in about one second, even if you
keep the watch pointed towards your face.
· Static electricity or magnetic force can interfere with
proper operation of the auto light switch. If the backlight
does not light, try moving the watch back to the starting
position (parallel with the ground) and then tilt it back
toward you again. If this does not work, drop your arm
all the way down so it hangs at your side, and then bring
it back up again.
· Under certain conditions, the backlight may not light until
about one second after you turn the face of the watch
towards you. This does not necessarily indicate
malfunction of the backlight.
More than 15 degrees
too high
How Stopwatch Data is Stored
The following table describes how data is stored when you perform the various button
operations described in "To measure times with the stopwatch".
Stopwatch Button Operation
A Start (from all zeros)
A Stop
A Re-start
D Lap/Split
D Clear
Data Store Operation
Creates a new log: current date and distance
(updated as timing progresses)
Time measurement stops, without storing data in
memory.
Time measurement re-starts, without storing
data in memory.
Creates new record: displayed lap/split times
Creates new record: displayed lap/split times
(Stopwatch display is cleared to all zeros.)
Backlight Precautions
· The electro-luminescent panel that provides illumination loses power after very long
use.
· The illumination provided by the backlight may be hard to see when viewed under
direct sunlight.
· The watch may emit an audible sound whenever the display is illuminated. This is
due to vibration of the EL panel used for illumination, and does not indicate
malfunction.
· The backlight automatically turns off whenever an alarm sounds.
· Frequent use of the backlight runs down the battery.
Auto light switch precautions
· Wearing the watch on the inside of your wrist and movement or vibration of your arm
can cause the auto light switch to activate and illuminate the display. To avoid
running down the battery, turn off the auto light switch whenever engaging in
activities that might cause frequent illumination of the display.