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Casio 2761 Manual

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Operation Guide 2760 2761
6
• The current time setting in accordance with the time calibration signal takes priority
over any time settings you make manually.
• The watch is designed to automatically update the date and day of the week for the
period January 1, 2000 to December 31, 2099. Setting of the date by the time
calibration signal cannot be performed starting from January 1, 2100.
• This watch can receive signals that differentiate between leap years and non-leap
years.
• Though this watch is designed to receive both time data (hour, minutes, seconds)
and date data (year, month, day), certain signal conditions can limit reception to time
data only.
• Normally, the signal reception date shown by the last signal screen is the date data
included in the received time calibration signal. When only time data is received,
however, the last signal screen shows the date as kept in the Timekeeping Mode at
the time of signal reception.
• If you are in an area where proper time calibration signal reception is impossible, the
watch keeps time within ±15 seconds a month at normal temperature.
• If you have problems with proper time calibration signal reception or if the time
setting is wrong after signal reception, check your Home Time Zone value and DST
(summer time) settings, and transmitter mode setting. The following are the initial
factory defaults for these settings.
Setting Initial Factory Default
GMT Differential Value +1.0 (or DST +2.0): Module 2760
+0.0 (or DST +1.0): Module 2761
DST (summer time) DS A (Auto switching)
Transmitter mode A (Automatic selection)
• To find out the module number of your watch, look at its
back cover. The Module number (2760 or 2761) will be
engraved inside the box on the back cover.
2760
Transmitters
This watch is able to receive time calibration signals transmitted in Germany
(Mainflingen) and England (Rugby). You can select either one of the transmitters, or
you can configure the watch to select the transmitter that has the strongest signal
automatically.
• The following explains how the watch determines which transmitter it should check
first while the watch is configured for automatic transmitter selection.
In this case:
The first signal search operation after
factory default settings are in effect, or after
the Home Time Zone has been changed.
Any case other than the above.
The watch does this:
1. Checks the Mainflingen signal first.
2. If the Mainflingen signal cannot be
received, checks the Rugby signal.
1. Checks the last successfully received
signal first.
2. If the last successfully received signal
cannot be received, checks the other
signal.
Module 2760
• Auto receive is turned on whenever the transmitter mode is A, D77.5, or M60. Auto
receive is turned off when the transmitter mode setting is OFF.
• Note that you can change the transmitter mode setting when +0.0 or +1.0 is
selected as the Home Time Zone.
• See “To select the transmitter mode” below.
In this case:
The first signal search operation after
factory default settings are in effect, or
after the Home Time Zone has been
changed.
Any case other than the above.
The watch does this:
1. Checks the Rugby signal first.
2. If the Rugby signal cannot be received,
checks the Mainflingen signal.
1. Checks the last successfully received
signal first.
2. If the last successfully received signal
cannot be received, checks the other
signal.
Module 2761
To select the transmitter mode
1. In the Timekeeping Mode, press B to display the last
signal screen.
2. Hold down A until the transmitter mode setting starts
to flash, which indicates the setting screen.
• If holding down A does not display the setting
screen, check the current Home Time Zone setting.
Press B to return to the Timekeeping Mode screen.
See “To specify your Home Time Zone” for more
information.
3. Use B or D to select the transmitter mode setting you
want to use.
• The following are the available transmitter mode settings.
A: Automatic selection of the Mainflingen or Rugby signal
D 77.5: Reception of the Mainflingen signal
M 60: Reception of the Rugby signal
OFF: Auto receive off
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4. Press A to exit the setting screen and return to the last signal screen.
• If you want to the return to the Timekeeping Mode screen, press B.
• Signal reception can take up to 14 minutes when the A option is selected.
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 day of the week is calculated
automatically in accordance with the date.
• 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 or when battery power drops to
Level 4.
• The current time for all time zones in the Timekeeping Mode and Dual Time Mode is
calculated in accordance with the Greenwich Mean Time (GMT) differential of each
zone, based on your Home Time Zone time setting.
• GMT differential is calculated by this watch based on Universal Time Coordinated
(UTC
*
) data.
*
UTC is the world-wide scientific standard of timekeeping. It is based upon carefully
maintained atomic (cesium) clocks that keep time accurately to within
microseconds. Leap seconds are added or subtracted as necessary to keep UTC
in sync with the Earth’s rotation. The reference point for UTC is Greenwich,
England.
12-hour/24-hour Timekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is also
applied in all other modes.
• 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.
Power Saving
When turned on, Power Saving automatically enters a sleep state whenever the watch
is left for a certain period in an area where it is dark. The table below shows how
watch functions are affected by Power Saving.
• There are actually two sleep state levels: “display sleep” and “function sleep”.
• Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
Operation
Digital display off, but all functions enabled
• Digital display off
• All functions, including analog timekeeping, disabled
• Internal timekeeping maintained
Elapsed Time in Dark
3 to 4 days
(Display Sleep)
8 days or more
(Function Sleep)
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 two 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. While any screen other than the last signal screen is on
the display in the Timekeeping Mode, hold down A
until the GMT differential value starts to flash, which
indicates the setting screen.
2. Press C nine times until the Power Saving on/off
screen appears.
3. Press D to toggle Power Saving on (on) and off (OFF).
4. Press A to exit the setting screen.
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Adjusting Dial Hand Positions
You can use the procedure in this section to adjust the position of the stopwatch 1/20
second dial hand and the battery level dial hand whenever they do not align with the
12 o’clock position when you enter the Stopwatch Mode.
Important!
Never move the battery level dial hand to any position
other than 12 o’clock. If you do, it will not correctly indicate
the battery power level.
To adjust dial hand positions
1. In the Timekeeping Mode, press C five times to enter
the Hand Setting Mode.
2. Hold down A until – 0 0 – starts to flash, which
indicates the analog setting screen.
3. Press A to display the dial hand setting screen.
• The dial hand setting screen shows 00:00.00, with the
two zeros on the far right flashing. This indicates that
the stopwatch 1/20 second dial is selected for
adjustment.
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Stopwatch 1/20
second dial
Battery level dial
4. Press D to advance the hand of the stopwatch 1/20 second dial one step, until it is
aligned with the 12 o’clock position.
5. After the 1/20 second dial hand is aligned properly, press C.
• This causes the two far left zeros of the 00:00.00 figures to flash, which indicates
that the battery level dial is selected for adjustment.
6. Press D to advance the hand of the battery level dial one step, until it is aligned
with the 12 o’clock position.
7. Press A to exit the setting screen.
• To return to the Timekeeping Mode, press C.
Illumination Precautions
• The illumination provided by the light may be hard to see when viewed under direct
sunlight.
• Illumination automatically turns off whenever an alarm sounds.
• Frequent use of illumination shortens the battery operating time.
Auto light switch precautions
• Wearing the watch on the inside of your wrist, movement of your arm, or vibration of
your arm can cause frequent activation of the auto light switch and illuminate the
face of the watch. To avoid running down the battery, turn off the auto light switch
whenever engaging in activities that might cause frequent illumination of the face.
• Note that wearing the watch under your sleeve while the auto light switch is turned
on can cause frequent illumination of the face and can run down the battery.
• Illumination may not turn on 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.
• Illumination turns off after about two seconds, even if
you keep the watch pointed towards your face.
More than 15 degrees
too high
6


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