Casio 5371 Operation Manual Download Page 2

E-8

Things to check before using the watch

1. Check the battery power level.

In any mode, hold down 

B

 for at least two seconds. The battery power indicator will appear on the digital 

display, and then the watch will enter the Timekeeping Mode.

The battery power level will be indicated as 

H

 or 

M

 on the left 

side of the digital display.

Go to step 2.

Power is low.

 Charge the watch by placing it in a location 

where it is exposed to light. For details, see “Charging the 
Watch” (page E-14).

NO

YES

YES

Does any one of the following conditions exist?

L

 flashing on the digital display.

 “

CHARGE

” is flashing on the display.

The watch is charged 
sufficiently.

NEXT

Battery power 
indicator

When

L

 is fl ashing, the second hand will jump at two-second intervals.

When

CHARGE

 is fl ashing, all hands will move to and stop at 12 o’clock.

E-9

2. Check the Home City and the daylight saving time (DST) setting.

Use the procedure under “To confi gure Home City and summer time settings” (page E-34) to confi gure 
your Home City and daylight saving time settings.

Important!

 Proper time calibration signal reception, and World Time Mode data depend on correct Home City, 

time, and date settings in the Timekeeping Mode. Make sure you confi gure these settings correctly.

3. Set the current time.

 To set the time using a time calibration signal 

  See “To get ready for a receive operation” (page E-22).

 To set the time manually

  See “Confi guring Current Time and Date Settings Manually” (page E-36).

The watch is now ready for use.

 For details about the watch’s radio controlled timekeeping feature, see “Radio Controlled Atomic 

Timekeeping” (page E-20).

E-10

Contents

About This Manual  …………………………………………………………………………………………… E-3

Using the Crown  ……………………………………………………………………………………………… E-4

To lock the crown  ……………………………………………………………………………………… E-4
To unlock the crown  …………………………………………………………………………………… E-4
To pull out, rotate, or push the crown in ……………………………………………………………… E-5

Things to check before using the watch  ………………………………………………………………… E-8

Charging the Watch ………………………………………………………………………………………… E-14

To recover from the sleep state  …………………………………………………………………… E-19

Radio Controlled Atomic Timekeeping  ………………………………………………………………… E-20

To get ready for a receive operation  ……………………………………………………………… E-22
To perform manual receive  ………………………………………………………………………… E-24
To check the latest signal reception results  ……………………………………………………… E-26
To turn auto receive on or off  ……………………………………………………………………… E-27

Mode Reference Guide  …………………………………………………………………………………… E-29

Timekeeping ………………………………………………………………………………………………… E-33

Confi guring Home City Settings  ………………………………………………………………………… E-34

To confi gure Home City and summer time settings ……………………………………………… E-34

Confi guring Current Time and Date Settings Manually ……………………………………………… E-36

To change the current time and date settings manually ………………………………………… E-36
To switch between 12-hour and 24-hour timekeeping …………………………………………… E-38

E-11

Hand Home Position Adjustment  ……………………………………………………………………… E-39

To adjust home positions …………………………………………………………………………… E-39

Moving the Hands for Easy Viewing of the Digital Dials  …………………………………………… E-40

To shift the hands and view digital info  …………………………………………………………… E-40

Specifying Altitude, Barometric Pressure, and Temperature Units  ……………………………… E-42

To specify altitude, barometric pressure, and temperature units  ……………………………… E-42

Taking Barometric Pressure Readings ………………………………………………………………… E-43

To take barometric pressure readings  …………………………………………………………… E-43
To show and hide barometric pressure differential  ……………………………………………… E-45
To enable or disable the barometric pressure change indicator  ……………………………… E-50
To calibrate the pressure sensor …………………………………………………………………… E-51

Taking Direction Readings  ……………………………………………………………………………… E-53

To take a direction reading  ………………………………………………………………………… E-53
To perform bidirectional calibration ………………………………………………………………… E-57
To perform magnetic declination correction  ……………………………………………………… E-58

Using the Altimeter Mode  ………………………………………………………………………………… E-62

To specify the altitude reading interval  …………………………………………………………… E-63
To take altitude readings  …………………………………………………………………………… E-64
To specify a reference altitude value ……………………………………………………………… E-66
To specify the altitude differential measurement range  ………………………………………… E-68
To use the altitude differential value  ……………………………………………………………… E-69

E-12

Taking Temperature Readings …………………………………………………………………………… E-73

To take temperature readings ……………………………………………………………………… E-73
To calibrate the temperature sensor  ……………………………………………………………… E-75

Checking the Current Time in a Different Time Zone ………………………………………………… E-76

To enter the World Time Mode  …………………………………………………………………… E-76
To confi gure World Time City and summer time settings  ……………………………………… E-77
To swap your Home City and World Time City …………………………………………………… E-79
To access the UTC (Universal Time Coordinated) time zone  ………………………………… E-79

Checking the Tide Level and Moon Ages (Tide/Moon)  ……………………………………………… E-80

To view the current tide level  ……………………………………………………………………… E-80
To view a Moon age  ………………………………………………………………………………… E-81
To view tide level and Moon age for a specifi c date and time  ………………………………… E-82
To calibrate the high tide time ……………………………………………………………………… E-85

Using the Stopwatch  ……………………………………………………………………………………… E-88

To enter the Stopwatch Mode ……………………………………………………………………… E-88
To perform an elapsed time operation  …………………………………………………………… E-88
To pause at a split time ……………………………………………………………………………… E-88
To measure two fi nishes  …………………………………………………………………………… E-89

E-13

Using the Countdown Timer ……………………………………………………………………………… E-90

To enter the Countdown Timer Mode ……………………………………………………………… E-90
To specify the countdown start time  ……………………………………………………………… E-90
To perform a countdown timer operation  ………………………………………………………… E-91
To stop the alarm  …………………………………………………………………………………… E-91

Using the Alarm  …………………………………………………………………………………………… E-92

To enter the Alarm Mode …………………………………………………………………………… E-92
To set an alarm time ………………………………………………………………………………… E-93
To turn an alarm and the Hourly Time Signal on and off………………………………………… E-94
To stop the alarm  …………………………………………………………………………………… E-94
To test the alarm  …………………………………………………………………………………… E-94

Illumination ………………………………………………………………………………………………… E-95

To turn on illumination manually …………………………………………………………………… E-95
To change the illumination duration  ……………………………………………………………… E-96
To enable or disable the auto light switch ………………………………………………………… E-97

Other Settings  ……………………………………………………………………………………………… E-99

To turn the button operation tone on or off  ……………………………………………………… E-99
To turn Power Saving on or off  …………………………………………………………………… E-99

Troubleshooting …………………………………………………………………………………………… E-100

Specifi cations  ……………………………………………………………………………………………… E-108

E-14

Charging the Watch

The face of the watch is a solar panel 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.

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-19) if its face is blocked 
by your sleeve even only partially.

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

E-15

Important!

 Allowing the watch to become very hot can cause its liquid crystal display to go blank (totally black or 

totally white, depending on the watch model). 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-19) 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.

Power Levels

In any mode, hold down 

B

 for at least two seconds. The battery power indicator will appear on the digital 

display, and then the watch will enter the Timekeeping Mode.
You can get an idea of the watch’s power level by observing the battery power indicator on the display.

Level

Battery Power Indicator Function Status

1

(H)

All functions enabled.

2

(M)

All functions enabled.

Battery power 
indicator

Battery power 
indicator

Operation Guide 5371

Summary of Contents for 5371

Page 1: ...stration Note that the product illustrations in this manual are intended for reference only and so the actual product may appear somewhat different than depicted by an illustration Crown Small hand Se...

Page 2: ...Temperature Readings E 73 To take temperature readings E 73 To calibrate the temperature sensor E 75 Checking the Current Time in a Different Time Zone E 76 To enter the World Time Mode E 76 To con gu...

Page 3: ...a sleep state while it is in the Stopwatch Mode or Countdown Timer Mode The watch will not enter a sleep state while barometric pressure change indicator is enabled page E 50 To recover from the slee...

Page 4: ...tion is disabled under any of the following conditions While power is at Level 3 L or lower page E 15 While the watch is in the power recovery mode page E 17 When the watch is in the function sleep st...

Page 5: ...n the Timekeeping Mode pull out the crown This will cause CITY to ash on the digital display 2 Press C This will cause HOUR MIN to ash on the digital display The second hand will point to either A a m...

Page 6: ...ed barometric pressure value changes to if a measured barometric pressure falls outside the range of 260 hPa to 1 100 hPa 7 65 inHg to 32 45 inHg The barometric pressure value will reappear as soon as...

Page 7: ...hown on page E 31 3 Pull out the crown This will cause the current barometric pressure reading value to ash on the digital display The timekeeping hour minute second hands will move to 2 o clock 4 Rot...

Page 8: ...on it are aligned with the actual directions of your location Basically what you are doing is aligning north on the map with north as indicated by the watch Note that map reading skills and experienc...

Page 9: ...Altitude differential Altitude differential E 68 Specifying the Altitude Differential Measurement Range You can use the procedure below to select either 100 meters or 1 000 meters as the altitude diff...

Page 10: ...30 minutes for the case of the watch to reach the surrounding temperature E 76 Checking the Current Time in a Different Time Zone You can use the World Time Mode to display the current time in any on...

Page 11: ...appears You can select any date between January 1 2000 and December 31 2099 You can use this screen to check the Moon age on the speci ed date To view the tide level for a speci ed date and time go t...

Page 12: ...Time Signal which will cause the watch to beep twice every hour on the hour To enter the Alarm Mode Use B to select the Alarm Mode ALARM as shown on page E 30 About one second after ALARM appears on t...

Page 13: ...The current time setting is off by hours Your Home City setting may be wrong page E 34 Check your Home City setting and correct it if necessary The current time setting is off by one hour If you are u...

Page 14: ...r system Full Auto calendar pre programmed from the year 2000 to 2099 Other Five display formats day of the week month day barometric pressure change month day hour minute second World Time hour minut...

Page 15: ...ens 2 JED Jeddah 3 THR Tehran 3 5 DXB Dubai 4 City Code City UTC Offset GMT Differential KBL Kabul 4 5 KHI Karachi 5 DEL Delhi 5 5 KTM Kathmandu 5 75 DAC Dhaka 6 RGN Yangon 6 5 BKK Bangkok 7 HKG Hong...

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