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Timekeeping - Casio 5173 Operation Manual

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Operation Guide 5173
Battery Power Indicator and Power Recovery Mode indicator
The battery power indicator indicates you the current status of the rechargeable
battery's power.
Battery Power indicator
Battery Power Indicator
1 (H)
2 (M)
3 (L)
(C: Charge)
(C: Charge)
The flashing
LOW indicator at Level 3 (L) 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 (
C: Charge), all functions are disabled and settings return to their initial
factory defaults. Once the battery reaches Level 2 (M) after falling to Level 5 (C:
Charge), reconfigure the current time, date, and other settings.
Display indicators reappear as soon as the battery is charged from Level 5 (
Charge) to Level 2 (M).
The watch's Home City code setting will change automatically to
whenever the battery drops to Level 5 (C: Charge). With this Home City code
setting, the watch is configured to receive the time calibration signals of Japan.
If you are using the watch in North America or Europe, or China you will need to
change the Home City code setting to match your location whenever the battery
drops to Level 5 (C: Charge).
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.
Power recovery
Overuse of display illumination or the beeper can
mode indicator
cause the R (Recover) indicator to appear in the upper
display, which indicates that the watch is in the battery
power recovery mode. Face illumination, the alarm,
the countdown timer alarm, time signals, and all hand
operations are disabled in the power recovery mode.
The watch continues to keep time internally, so regular
timekeeping and function will resume as soon as battery
power recovers to normal levels, which is indicated when
the R indicator disappears.
R appears frequently, it probably means that remaining
battery power is low. Leave the watch in bright light for
some time to allow it to charge.
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.
Also note that 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.
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 six months.
The following table shows the amount of time the watch needs to be exposed to
light each day in order to generate enough power for normal daily operations.
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)
For details about the battery operating time and daily operating conditions, see the
"Power Supply" section of the Specifications.
Stable operation is promoted by frequent exposure to light.
Recovery Times
The table below shows the amount exposure that is required to take the battery from
one level to the next.
Exposure Level
Level 5
Level 4
Outdoor sunlight
2 hours
(50,000 lux)
Sunlight through a window
6 hours
(10,000 lux)
Daylight through a window
10 hours
on a cloudy day (5,000 lux)
Indoor fluorescent lighting
106 hours
(500 lux)
The above exposure time values are all for reference only. Actual required
exposure times depend on lighting conditions.
Function Status
All functions enabled
All functions enabled
Auto and manual
receive, illumination,
and beeper disabled
(Charge Soon Alert)
Except for
timekeeping, all
functions and display
indicators disabled
All functions disabled
TYO (Tokyo)
Approximate Exposure Time
8 minutes
30 minutes
48 minutes
8 hours
Approximate Exposure Time
Level 3
Level 2
Level 1
21 hours
6 hours
78 hours
21 hours
126 hours
34 hours
– – –
– – –


You can adjust the Home City time and date in the Timekeeping Mode manually.
You also can simultaneously display the current time in one other time zone, by
specifying a Dual Time City.
For information about selecting a Dual Time City, see "To specify the Dual Time
D in the Timekeeping Mode will cycle the lower display between the
screens shown below.
Home City Date
Dual Time
Read This Before You Set the Time and Date!
This watch is preset with a number of city codes, each of which represents the time
zone where that city is located. When setting the time, it is important that you first
select the correct city code for your Home City (the city where you normally use the
watch). If your location is not included in the preset city codes, select the preset city
code that is in the same time zone as your location.
Note that all of the times for the World Time City codes and Dual Time City are
displayed in accordance with the time and date settings you configure for the
Timekeeping Mode.
To set the time and date manually
In the Timekeeping Mode, hold down
seconds until the left dial hand points to T1 and the city
code flashes on the upper display. This is the setting
D and B to select the city code you want.
Make sure you select your Home City code before
changing any other setting.
For full information on city codes, see the "City Code
C to change the flashing screen content in the sequence shown below to
select the other settings.
City Code
12/24-Hour Format
Power Saving
When the timekeeping setting you want to change is flashing, use
change it as described below.
To do this:
Change the city code.
Cycle between Auto DST (
Saving Time (
) and Standard Time
Toggle between 12-hour (
24-hour (
) timekeeping.
Reset the seconds to
Change the hour and minutes.
Change the year, month, or day.
Toggle between Power Saving on (
off (
A twice to exit the setting mode.
For details about the Daylight Saving Time setting, see "To change the Daylight
Saving Time (summer time) setting". For information about Power Saving, see
"To turn Power Saving on and off".
Auto DST (
) can be selected only while LIS, LON, MAD, PAR, ROM, BER,
CHI, MIA, YTO, NYC, YHZ, or YYT is selected as the Home City code. For more
information, see "Daylight Saving Time (DST)" below.
The day of the week is displayed automatically in accordance with the date
(year, month, and day) settings.
12-hour and 24-hour timekeeping
With the 12-hour format, the PM (
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 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.
Home City Time
A for about five
D or B to
Do this:
Use D (east) and B (west).
Press D.
), Daylight
Press D.
) and
Press D.
Use D (+) and B (–).
Press D.
) and