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USER’S GUIDE 2550
5
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.
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 B to illuminate the display for about two seconds.
• 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 two seconds,
whenever you position your wrist as described below in any mode.
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
While the Mode Menu or Timekeeping Mode screen is on the display, hold down D
for about two seconds to toggle the auto light switch on (
displayed) and off (
not displayed).
• The auto light switch on indicator (
) is on the display in all modes while the auto
light switch is turned on.
• In order to protect against running down the battery, the auto light switch
automatically turns off approximately six hours after you turn it on. Repeat the above
procedure to turn the auto light switch back on if you want.
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.
Auto Display
Auto Display continually changes the contents of the
digital display.
To turn off Auto Display
Press any button (except for B) or key to turn off Auto
Display.
To turn on Auto Display
Hold down C for about three seconds.
• Note that Auto Display cannot be performed while a
setting screen is on the display.
Inputting Text
The following describes how to input text in the e-DATA MEMORY, Telememo and
Alarm Modes.
To input characters
Press the keypad keys to input characters at the cursor
position. You can input upper alpha characters (
A through
Z), lower alpha characters (a through z), numbers (0
through 9), and various symbols.
• Each key is assigned more than one character. Each
press of a key sequentially changes the character at the
cursor position. Pressing [2], for example, changes the
characters at the cursor position in the sequence:
2
➜
A
➜
B
➜
C
➜
2, etc. The letters and number that a
key can input are printed on the key itself. Symbols are
not marked on the key.
• Each press of [0] toggles input between zero and a space. Pressing [pm] cycles
through the various symbols that can be input.
• The B button acts as a delete button during text input. Move the cursor to the
character you want to delete, and then press B. Characters to the right of the
deleted character are shifted left to fill the space.
• To switch between upper case and lower case characters, press [=] during text
input. The character type indicator shows A when upper case is selected, and a for
lower case.
• See the “Character List” for information about all the characters that are assigned to
each key.
Auto Return Features
• If you leave the watch without performing any operation in the e-DATA MEMORY,
Telememo, or Alarm Mode for two or three minutes, or in the Calculator Mode for six
or seven minutes, it automatically changes to the Mode Menu.
• If you leave a screen with flashing digits or a cursor 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.
Scrolling
The C and D buttons and the [1] and [=] keys 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 at high speed.
Initial Screens
• When you enter the e-DATA MEMORY, Telememo, World Time, or Alarm Mode, the
data you were viewing when you last exited the mode appears first.
• When you enter the Timekeeping Mode from the Mode Menu, the Home City time
appears first. The information that appears in the top line of the screen is the same
type of information that was displayed when you last exited the Timekeeping Mode.
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.
• The year can be set in the range of 2000 to 2099.
• The watch’s built-in full automatic calendar 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.
World Time
• The current time in all World Time Mode cities is calculated in accordance with the
Greenwich Mean Time (GMT) differential for each city, based on the current Home
City time setting in the Timekeeping Mode.
• The GMT differential is the time difference of the time zone where the city is located
from Greenwich Mean Time.
• GMT differential is calculated by this watch based on Universal Time Coordinated
(UTC) data.
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 shortens the battery life.
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.
• 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 two seconds, 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.
Battery
The indicator BATT flashes on the display any time
battery power is below a certain level. Low battery power
can cause the following conditions to occur.
• Dim, difficult-to-read display characters
• Failure of the backlight and beeper tone operations
• Inability to perform e-DATA MEMORY and Telememo
Mode operations
If battery power goes low while you are inputting e-DATA MEMORY or Telememo
data, the data you are inputting may not be saved in memory. Normal watch operation
will return after the BATT indicator disappears. If it does not disappear, have the
battery replaced.
Always leave battery replacement up to the dealer where you bought the watch
or to an authorized CASIO distributor. Be sure to show the “Attention dealer or
CASIO distributor” information to the person replacing the battery.
Indicator
If you use the backlight or any of the alarm functions a number of times during a short
period,
appears in the top line of the Mode Menu screen, and the following
operations become disabled until battery power recovers.
Backlight; Beeper tone; e-DATA MEMORY Mode and Telememo Mode operations
• After some time, battery power will recover and will disappear, indicating
that the above functions are enabled again.
Character type indicator
Cursor
More than 15 degrees
too high
Auto light switch on indicator