Charging The Watch; Radio Controlled Atomic Timekeeping - Casio Pro Trek PRW-5100G-4 Operation Manual

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E-82 Checking the Current Time in a Different Time Zone
E-82
To enter the World Time Mode
E-82
To view the time in another time zone
E-83
To specify standard time or daylight saving time (DST) for a city
E-84
To swap your Home City and World Time City
E-86 Auto Correction of Hand Home Positions
E-87
To trigger auto correction of hand home positions
E-88 Adjusting Home Positions Manually
E-88
To adjust home positions manually
E-90 Illumination
E-90
To turn on illumination manually
E-91
To change the illumination duration
E-93
To turn the auto light switch on and off
E-95 Button Operation Tone
E-95
To turn the button operation tone on and off
E-96 Troubleshooting
E-103 Specifi cations
E-8
Important!
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.
Turn on the watch's Power Saving function (page E-14) and keep it in an area normally exposed to
bright light when storing it for long periods. This helps to ensure that power does not run down.
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 power to run down. Expose the watch to bright light
whenever possible.
E-10
The fl ashing L 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 5, all functions are disabled and settings return to their initial factory defaults. Once the battery
reaches Level 2 ( M) after falling to Level 5, reconfi gure the current time, date, and other settings.
Display indicators reappear as soon as the battery is charged from Level 5 to Level 2 ( M).
Leaving the watch exposed to direct sunlight or some other very strong light source can cause the
battery power indicator to show a reading temporarily that is higher than the actual battery level. The
correct battery level should be indicated after a few minutes.
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.
Charging Required Indication (by second hand)
When battery power reaches Level 3, the second hand of the watch will
jump at 2-second intervals in the Timekeeping Mode to let you know that
charging is required.
Power Recovery Mode
Repeated sensor measurement, illumination, or use of tones over a short period of time may cause the
watch to enter a power recovery mode, which is indicated by a recovery indicator ( R) to fl ash on the
digital display. The watch will remain in the power recovery mode until battery power recovers.
E-12
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: "display sleep" and "function sleep".
With this watch, the Power Saving function cannot be disabled.
Elapsed Time in Dark
Hands and Display
Blank display, second hand
60 to 70 minutes (display sleep)
stopped at 12 o'clock.
Blank display, all hands
6 or 7 days (function sleep)
stopped at 12 o'clock.
The watch will not enter a sleep state between 6:00 AM and 9:59 PM. If the watch is already in a sleep
state when 6:00 AM arrives, however, it will remain in the sleep state.
You will not be able to enter the Compass, Barometer/Thermometer, Altimeter, Stopwatch, or
Countdown Timer Mode while the watch is in a sleep state.
To recover from the sleep state
Move the watch to a well-lit area, press any button, or angle the watch towards your face for reading (page
E-91).
E-14
Operation Guide 5114 5214
Operation
Except for display and second hand, all
functions enabled.
Except for timekeeping, all functions
disabled.

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, leave it in a location where it
is exposed to light.
Best charging performance is
achieved by exposing the watch to
the strongest light available.
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
Power Levels
You can check the current battery power level by viewing the battery power indicator that appears on the
digital display when you enter the Timekeeping Mode.
To enter the Timekeeping Mode from any other mode, hold down D for about two seconds.
Level Battery Power Indicator
1
(H)
2
(M)
Battery power
Battery power
indicator
indicator
3
(L)
Month Day
Month Day
Day of week
Day of week
4
5
Illumination, tones, and sensor operations are disabled and the hands of the watch stop until battery
power recovers.
Battery power takes about 15 minutes to recover. The recovery indicator ( R) will stop fl ashing and
normal watch operation will be restored when battery recovery is complete.
Frequent fl ashing of the recovery indicator ( R) indicates that battery power is low. Expose the watch to
light to charge its battery.
Charging Times
Daily
Exposure Level (Brightness)
Operation
*1
Outdoor sunlight (50,000 lux)
8 min.
Sunlight through a window (10,000 lux)
30 min.
Daylight through a window on a
48 min.
cloudy day (5,000 lux)
Indoor fl uorescent lighting (500 lux)
8 hours
*1 Approximate amount of exposure time required each day to generate enough power for normal daily
operation.
*2 Approximate amount of exposure time (in hours) required to take power from one level to the next.
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-106).

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-31) 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 is this:
LONDON (LON), PARIS (PAR), ATHENS (ATH)
HONG KONG (HKG)
TOKYO (TYO)
HONOLULU (HNL), ANCHORAGE (ANC),
LOS ANGELES (LAX), DENVER (DEN), CHICAGO (CHI),
NEW YORK (NYC)
Important!
The areas covered by HONOLULU ( HNL) and ANCHORAGE ( ANC) are quite far from the calibration
signal transmitters, so certain conditions may cause reception problems.
When HONG KONG ( 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 confi gure Home City settings" (page E-28) for
information about how to do this.
When wearing the watch, make sure
that its face is not blocked from light
by the sleeve of your clothing.
The watch may enter a sleep state
(page E-14) if its face is blocked
by your sleeve even only partially.
Function Status
All functions enabled.
All functions enabled.
Signal reception, illumination, tone,
sensor, and hand home position
correction disabled. Second hand jumps
every two seconds.
Signal reception, illumination, tone,
sensor, and hand home position
correction disabled. Blank digital display.
Second hand stopped, hour and minute
hands stopped at 12 o'clock.
All hands stopped at 12 o'clock. All
functions disabled.
Level Change *2
Level 5
Level 4
Level 3
Level 2
2 hours
18 hours
6 hours
69 hours
9 hours
111 hours
90 hours
– – –
The watch can receive the signal from the transmitter
located here:
Anthorn (England), Mainfl ingen (Germany)
Shangqiu City (China)
Fukushima (Japan), Fukuoka/Saga (Japan)
Fort Collins, Colorado (United States)
E-9
E-11
Level 1
5 hours
19 hours
30 hours
– – –
E-13
E-15

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