Charging The Watch; To Recover From The Sleep State; Radio Controlled Atomic Timekeeping - Casio 5174 Operation Manual

Operation Guide 5174

Charging the Watch

The face of the watch is a solar cell that generates power from light. The generated
power charges a built-in rechargeable battery, which powers watch operations. The
watch charges whenever it is exposed to light.
Charging Guide
Whenever you are not
wearing the watch, be sure
to leave it in a location
where it is exposed to light.
Best charging
performance is achieved
by exposing the watch to
light that is as strong as
possible.
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Power Levels
You can get an idea of the watch's power level by
observing the movement of the x Second Hand in the
Timekeeping Mode.
If the x Second Hand is moving normally in one-second
intervals, power is at Level 1.
If the x Second Hand is moving at two-second intervals,
power is at Level 2, which is quite low. Expose the watch
to light as soon as possible so it can charge.
Moves at two-second
intervals.
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Power Recovery Mode
The watch is designed to go into a power recovery mode that stops hand operation
temporarily whenever power suddenly drops below a certain level due to overuse
of the alarm tone over a short period. Note that all operations are disabled while the
watch is in the power recovery mode.
The hands will move to the correct positions and the watch will resume normal
operation after power recovers (in about 15 minutes). Putting the watch in a location
where it is exposed to light will help power to recover sooner.
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Power Saving
Power Saving enters a sleep state automatically 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 actually are two sleep state levels: "second hand sleep" and "function sleep".
Elapsed Time in Dark Operation
x x Second Hand only stopped at 12 o'clock, all other
60 to 70 minutes (second hand
sleep) functions enabled
All functions, including analog timekeeping, disabled
6 or 7 days (function sleep)
Internal timekeeping maintained
The watch will not enter a sleep state between 6:00 a.m. and 9:59 p.m. If the watch
is already in a sleep state when 6:00 a.m. arrives, however, it will remain in the
sleep state.
The watch will not enter a sleep state while it is in the Stopwatch Mode or
Countdown Timer Mode.
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Radio Controlled Atomic Timekeeping

This watch receives a time calibration signal and updates its time setting accordingly.
However, when using the watch outside of areas covered by time calibration signals,
you will have to adjust the settings manually as required. See "Confi guring Current
Time and Date Settings Manually" (page E-38) for more information.
This section explains how the watch updates its time settings when the city code
selected as the Home City is in Japan, North America, Europe, or China, and is one
that supports time calibration signal reception.
If your Home City Code setting The watch can receive the signal from the
is this: transmitter located here:
LON, PAR, ATH Anthorn (England), Mainfl ingen (Germany)
HKG Shangqiu City (China)
TYO Fukushima (Japan), Fukuoka/Saga (Japan)
HNL, ANC, LAX, DEN, CHI, NYC Fort Collins, Colorado (United States)
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Warning!
Leaving the watch in bright light for charging 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
When wearing the watch,
Important!
makes sure that its face is
Keep the watch in an area normally exposed to bright light when storing it for long
not blocked from light by the
periods. This helps to ensure that power does not run down.
sleeve of your clothing.
Storing the watch for long periods in an area where there is no light or wearing it in
The watch may enter a
such a way that it is blocked from exposure to light can cause power to run down.
sleep state (page E-16) if
Make sure that the watch is exposed to bright light whenever possible.
its face is blocked by your
sleeve even only partially.
Level Hand Movement
When power drops to Level 3, all functions will be disabled but the watch will
continue to keep time internally for about one week. If you recharge the battery
suffi ciently during this period, the analog hands will move automatically to the
correct setting and regular timekeeping will resume. After one week, all settings
(including timekeeping) will be cleared. Recharging the battery will reset all settings
to their initial factory defaults.
Charging Times
Exposure Level (Brightness)
Outdoor sunlight (50,000 lux)
Window sunlight (10,000 lux)
Window sunlight on cloudy day
(5,000 lux)
Indoor fl uorescent lighting (500 lux)
* 1 Approximate exposure each day to generate power for normal daily operation.
* 2 Approximate amount exposure time required to take power up one level.
The above exposure times all are for reference only. Actual exposure times depend
on lighting conditions.
For details about the operating time and daily operating conditions, see the "Power
Supply" section of the Specifi cations (page E-73).

To recover from the sleep state

Move the watch to a well-lit area or press any button.
Important!
The areas covered by HNL and ANC are quite far from the calibration signal
transmitters, so certain conditions may cause reception problems.
When HNL or HKG is selected as the Home City, only the time and date are
adjusted according to the time calibration signal. You need to switch manually
between standard time and daylight saving time (DST) if required. See "To toggle
the Home City time between standard time and daylight saving time" (page E-36)
for information about how to do this.
1 Normal.
x x Second Hand moving at two-second
2 intervals.
m m Day changes to 1 (home position).
x x Second Hand stopped.
z z Hour Hand and c c Minute Hand stopped
3
at 12 o'clock.
Daily
Operation
*1
8 minutes
30 minutes
48 minutes
8 hours
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Function Status
All functions enabled.
Beeper, time calibration signal
reception, and countdown timer
operation disabled.
All functions disabled.
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Level Change *2
Level 3 Level 2 Level 1
2 hours 23 hours
6 hours 85 hours
8 hours 138 hours
92 hours – – –
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