USER'S GUIDE 2590/2591
1
If the display of the watch is blank...
If the Power Saving on (P.SAVE) indicator flashes 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.
· See "Power Saving Function" for more
information.
[Module 2590]
[Module 2591]
About This Manual
· The operational procedures for Modules 2590 and 2591
are identical. All of the illustrations in this manual show
Module 2590.
· 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.
Timekeeping Mode
Alarm Mode
Stopwatch Mode
Countdown Timer
Mode
Dual Time Mode
Press
.
General Guide
· Press C to change from mode to mode.
· In any mode, press B to illuminate the display.
· In any mode, hold down C for about two seconds to return to the 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 A 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.
Seconds
Hour
Minutes
Day
Month
Year
3. When the setting you want to change is flashing, press D to change it as
described below.
To change this setting
Seconds
Hour, Minutes, Year, Month, Day
Perform this button operation
Press D to reset to 00.
Press D to increase the setting.
· Pressing D while the seconds are in the range of 30 to 59 resets them to 00 and
adds 1 to the minutes. In the range of 00 to 29, the minutes are unchanged.
4. Press A to exit the setting screen.
· The day of the week is automatically displayed in accordance with the date (year,
month, and day) settings.
· The year can be set in the range of 2000 to 2099.
· 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 after you have the watch's battery replaced or when
battery power drops to Level 4.
To toggle between 12-hour and 24-hour timekeeping
In the Timekeeping Mode, press D to toggle between 12-hour timekeeping and
24-hour timekeeping.
· With the 12-hour format, the PM (Module 2590: PM/Module 2591: P) indicator
appears to the left of the hour digits for times in the range of noon to 11:59 p.m. and
no indicator appears to the left of the hour digits 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 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
applied in all other modes.
Alarms
You can set up to five independent multi-function alarms
with hour, minutes, month, and day. 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.
· There are five alarms numbered 1 through 5. 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.
· Alarm settings (and an Hourly Time Signal setting) are
available in the Alarm Mode, which you enter by
pressing C.
Alarm Types
The alarm type is determined by the settings you make, as described below.
· Daily alarm
Set the hour and minutes for the alarm time. This type of setting causes the alarm to
sound everyday at the time you set.
· Date alarm
Set the month, day, hour and minutes for the alarm time. This type of setting causes
the alarm to sound at the specific time, on the specific date you set.
· 1-Month alarm
Set the month, hour and minutes for the alarm time. This type of setting causes the
alarm to sound everyday at time you set, only during the month you set.
· Monthly alarm
Set the day, hour and minutes for the alarm time. This type of setting causes the alarm
to sound every month at time you set, on the day you set.
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.
Press
.
· To set a one-time alarm, display one of the screens indicated by an alarm number
from 2 through 5. To set the snooze alarm, display the screen indicated by 1.
2. After you select an alarm, hold down A until the hour setting of the alarm time
starts to flash, which indicates the setting screen.
· This operation automatically turns on the alarm.
3. Press C to move the flashing in the sequence shown below to select other
settings.
Hour
Minutes
Month
Day
Hour : Minutes Seconds
Day of week
PM indicator
Month Day
Alarm date
(Month-Day)
Alarm time
(Hour : Minutes)
Alarm number
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.
USER'S GUIDE 2590/2591
2
4. While a setting is flashing, press D to increase it.
· To set an alarm that does not include a month (Daily alarm, Monthly alarm),
set x for the month. Press D until the x mark appears (between 12 and 1) while
month setting is flashing.
· To set an alarm that does not include a day (Daily alarm, 1-Month alarm),
set xx for the day. Press D until the xx mark appears (between the end of the
month and 1) while the day setting is flashing.
· When setting the alarm time using the 12-hour format, take care to set the time
correctly as a.m. or p.m. (PM/P indicator).
5. Press A to exit the setting screen.
Alarm Operation
The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the
watch is in. 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.
· To stop the alarm tone after it starts to sound, press any button.
· 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.
To turn Alarms 2 through 5 and the Hourly Time Signal on and off
1. In the Alarm Mode, use D to select a one-time alarm
(alarm number 2 through 5) or the Hourly Time Signal
(:00).
2. Press A to toggle it on and off.
· The on/off status of Alarms 2 through 5 and the Hourly
Time Signal is shown by indicators along the bottom of
the displays.
· The alarm on indicators and Hourly time Signal on
indicator are displayed in all modes.
· While an alarm is sounding, the applicable alarm on
indicator flashes on the display.
Stopwatch
The stopwatch lets you measure elapsed time, split times,
and two finishes.
· The display range of the stopwatch is 23 hours,
59 minutes, 59.99 seconds.
· The stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
· The stopwatch measurement operation continues even
if you exit the Stopwatch Mode.
· Exiting the Stopwatch Mode while a split time is frozen
on the display clears the split time and returns to
elapsed time measurement.
· All of the operations in this section are performed in the
Stopwatch Mode, which you enter by pressing C.
To measure times with the stopwatch
Elapsed time
Start
Stop
Re-start
Stop
Clear
Start
Split
(SPL displayed)
Split release
Stop
Clear
Start
Split
Stop
Split release
Clear
Split time
Two Finishes
First runner
finishes.
Display time of
first runner.
Second runner
finishes.
Display time of
second runner.
Dual Time
The Dual Time Mode lets you keep track of time in a different time zone.
· In the Dual Time Mode, the seconds count 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. In the Dual Time Mode, hold down A until the hour
setting starts to flash, which indicates the setting
screen.
3. Press C to change the selection in the following
sequence.
Hour
Minutes
4. Press D to increase the setting.
5. Press A to exit the setting screen.
Backlight
The backlight uses an LED (light-emitting diode) and a
light guide panel that cause 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 in the dark.
· The auto light switch must be turned on (indicated by
the auto light switch 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 B to illuminate the display for about
one second.
· The above operation turns on the backlight regardless
of the current auto light switch setting.
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 LED 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.
· Be sure to wear the watch on the outside of your left wrist while using the auto light
switch.
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 any mode, hold down B for about two seconds to toggle the auto light switch on
(Auto light switch indicator displayed) or off (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.
Alarm on indicator
Hourly time signal
on indicator
To select the operation of Alarm1
1. In the Alarm Mode, use D to select Alarm1.
2. Press A to cycle through the available settings in the sequence shown below.
Snooze on indicator and Alarm1 on indicator
One-time
alarm on
Alarm off
Snooze
alarm on
Press
.
· The snooze on indicator and Alarm1 on indicator are displayed in all modes.
· The snooze on indicator flashes during the 5-minute intervals between alarms.
· The alarm indicator (Alarm1 on and/or snooze on) flashes while the alarm is
sounding.
Countdown Timer
The countdown timer can be set within a range of
one minute to 24 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 enter by pressing
C.
To use the countdown timer
Press D 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 after the alarm stops.
· The countdown timer measurement operation continues even if you exit the
Countdown Timer Mode.
· Press D while a countdown operation is in progress to pause it. Press D again to
resume the countdown.
· To completely stop a countdown operation, first pause it (by pressing D), and then
press A. This returns the countdown time to its starting value.
To set the countdown start time
1. In the Countdown Timer Mode, hold down A until the
hours setting of the countdown start time starts to flash,
which indicates the setting screen.
2. Press C to move the flashing between the hours and
minutes settings.
3. While a setting is flashing, use D to change it.
· To set the starting value of the countdown time to
24 hours, set 0:00.
4. Press A to exit the setting screen.
To turn auto-repeat on and off
1. In the Countdown Timer Mode, hold down A until the
hours setting of the countdown start time starts to flash,
which indicates the setting screen.
2. Press B to toggle auto-repeat on (
displayed) and
off (
not displayed).
· Note that pressing B in the above operation also turns
on the backlight.
· When the end of the countdown is reached while
auto-repeat is on, the alarm sounds, but the countdown
restarts from the beginning without stopping. You can
stop the countdown by pressing D and manually reset
to the start time by pressing A.
· The auto-repeat indicator appears in the Countdown
Timer Mode only.
Hour : Minutes Seconds
Auto-repeat indicator
Minutes
Seconds
Hours
1/100 second
Hour : Minutes Seconds
Auto light switch indicator
USER'S GUIDE 2590/2591
3
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.
· 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.
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 bright 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 ML2016
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
The battery power indicator on the display shows you the current status of the
rechargeable battery's power.
Level
1
2
3
4
Battery Power
indicator
(Charge Soon Alert)
Function Status
All functions enabled.
All functions enabled.
Beeper tone, backlight,
display, and buttons are
disabled.
All functions, including
timekeeping, are disabled.
· The flashing CHARGE indicator at Level 3 tells you that battery power is very 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 backlight or any of the alarm functions 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.
Backlight; Beeper tone
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.
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 11 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
Charge Times
Exposing the watch to light for the periods shown below each day restores the power
used by the above operating 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
5 minutes
24 minutes
48 minutes
8 hours
Recovery Times
The table below shows the amount of exposure that is required to take the battery
from one level to the next.
· 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)
Approximate Exposure Time
Level 4
Level 3
24 hours
122 hours
Level 2
15 hours
76 hours
155 hours
· The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
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 about one hour in the
Timekeeping Mode, Alarm Mode, or Dual Time Mode. The
sleep state is indicated by a blank screen with Power
Saving on (P.SAVE) indicator 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.
· The watch will not enter the sleep state between 6:00
AM and 9:59 PM. If the watch is already in the sleep
state when 6:00 AM arrives, however, it will remain in
the sleep state.
To recover from the sleep state
Perform any one of the following operations.
· Move the watch to a well-lit area.
· Press any button.
· Angle the watch towards your face for reading.
To turn Power Saving on and off
In the Timekeeping Mode, hold down D for about two
seconds to toggle Power Saving on (P.SAVE indicator
displayed) and off (P.SAVE indicator not displayed).
· Note that pressing D also toggles between 12-hour
timekeeping and 24-hour timekeeping.
Level 1
17 hours
85 hours
172 hours
Auto return features
If you leave a screen with flashing digits 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.
Data and Setting Scrolling
The D button is used to scroll through setting screen data on the display. Holding
down this button during a scroll operation scrolls through the data at high speed.
Backlight Precautions
· The illumination provided by the backlight may be hard to see when viewed under
direct sunlight.
· The backlight automatically stops illuminating whenever an alarm sounds.
· Frequent use of the backlight shortens the battery life.
Auto light switch precautions
· Avoid wearing the watch on the inside of your wrist.
Doing so causes the auto light switch to operate when it
is not needed, which shortens battery life. If you want to
wear the watch on the inside of your wrist, turn off the
auto light switch feature.
· 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.
· You may notice a very faint clicking sound coming from the watch when it is shaken
back and forth. This sound is caused by mechanical operation of the auto light
switch, and does not indicate a problem with the watch.
Solar cell
Power Saving on
(P.SAVE) indicator
Battery power indicator
Power Saving on indicator
More than 15 degrees
too high