Casio 5371 Operation Manual Download Page 14

E-104

Charging

■ 

The watch does not resume operation after I expose it to light.

This can happen after the power level drops to Level 5 (page E-15). Keep the watch exposed to light until 
it recharges suffi ciently.

■ 

RECOVER is fl ashing on the digital display.

The watch is in the charge recovery mode. Wait until the recovery process is complete (about 15 minutes). 
The watch will recover more quickly if you place it in a brightly lit location.

Note

 Performing repeated illumination and/or sensor reading operations over a short time period can cause 

a sudden drop in watch’s charge. This will cause the watch to enter the charge recover mode. The 
watch is in the charge recovery mode when 

RECOVER

 is fl ashing on the digital display. The charge 

recovery mode is the same as a low battery charge state, access to some functions is limited while the 
watch charge is recovering. Normal operation will resume after recovery is complete. For more 
information, refer to “Power Recovery Mode” (page E-17).

 A fl ashing 

CHARGE

 indicator means that the charge level of the watch has suddenly dropped. 

Immediately expose the watch to light to charge it.

Time Calibration Signal

The information in this section applies only when 

LON

,

PAR

,

ATH

,

HKG

,

HNL

,

ANC

,

LAX

,

DEN

,

CHI

,

NYC

, or 

TYO

 is selected as the Home City. You need to adjust the current time manually when any other 

city is selected as the Home City.

E-105

■ 

The display shows the ERR indicator when I check the result of the latest receive operation.

Possible Cause

Remedy

Page

 You are wearing or moving the 

watch, or performing a button 
operation during the signal 
receive operation.

 The watch is in an area with 

poor reception conditions.

Keep the watch in an area where reception conditions are good 
while the signal receive operation is performed.

E-22

You are in an area where signal 
reception is not possible for 
some reason.

See “Approximate Reception Ranges”.

E-21

The calibration signal is not 
being transmitted for some 
reason.

 Check the website of the organization that maintains the time 

calibration signal in your area for information about its down times.

 Try again later.

■ 

The current time setting changes after I set it manually.

You may have the watch confi gured for auto receive of the time calibration signal (page E-23), which will 
cause the time to be adjusted automatically according to your currently selected Home City. If this results 
in the wrong time setting, check your Home City setting and correct it, if necessary (page E-34).

E-106

■ 

The current time setting is off by one hour.

Possible Cause

Remedy

Page

Signal reception on a day for 
switching between standard 
time/daylight saving time (DST) 
may have failed for some reason.

Perform the operation under “To get ready for a receive operation”. 
The time setting will be adjusted automatically as soon as signal 
reception is successful.

E-22

If you are unable to receive the time calibration signal, change the 
standard time/daylight saving time (DST) setting manually.

E-36

■ 

Auto receive is not performed or you cannot perform manual receive.

Possible Cause

Remedy

Page

The watch is not in the 
Timekeeping Mode.

Auto receive is performed only while the watch is in the Timekeeping 
Mode. Enter the Timekeeping Mode.

E-31

Your Home City setting is wrong. Check your Home City setting and correct it, if necessary.

E-34

There is not enough power for 
signal reception.

Expose the watch to light to charge it.

E-14

E-107

■ 

Signal reception is being performed successfully, but the time and/or day is wrong.

Possible Cause

Remedy

Page

Your Home City setting is wrong. Check your Home City setting and correct it, if necessary.

E-34

The DST setting may be 
incorrect.

Change the DST setting to Auto DST.

E-34

Calibration signal interference 
caused the time and/or date 
setting to be adjusted 
incorrectly.

Perform manual calibration signal receive.

E-24

E-108

Specifi cations

Accuracy at normal temperature:

 ±15 seconds a month (with no signal calibration)

Digital Timekeeping:

 Hour, minutes, seconds, a.m. (

A

)/ p.m. (

P

), month, day, day of the week

Time format: 12-hour and 24-hour
Calendar 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, minute; Moon age); Home City code (can be assigned 
one of 29 city codes +UTC); standard time / daylight saving time (summer time)

Analog Timekeeping:

 Hour, minutes (hand moves every 10 seconds), seconds

Time Calibration Signal Reception:

 Auto receive 6 times a day (5 times a day for the Chinese calibration 

signal) ; Remaining auto receives cancelled as soon as one is successful; Manual receive; 
Receive Mode

Receivable Time Calibration Signals: Mainfl ingen, Germany (Call Sign: DCF77, Frequency: 77.5 

kHz); Anthorn, England (Call Sign: MSF, Frequency: 60.0 kHz); Fort Collins, Colorado, the 
United States (Call Sign: WWVB, Frequency: 60.0 kHz); Fukushima, Japan (Call Sign: JJY, 
Frequency: 40.0 kHz); Fukuoka/Saga, Japan (Call Sign: JJY, Frequency: 60.0 kHz) ; Shangqiu 
City, Henan Province, China (Call Sign: BPC, Frequency: 68.5 kHz)

Barometer:

Measurement and display range:
 

260 to 1,100 hPa (or 7.65 to 32.45 inHg)

Display unit: 1 hPa (or 0.05 inHg)
Other: Calibration; Barometric pressure graph; Barometric pressure differential pointer; Barometric 

pressure change indicator

E-109

Digital Compass:

 60 seconds continuous reading; 16 directions; Angle value 0° to 359°; Measurement 

unit: 1° (digital display)/6° (hand); North indicated by second hand: Compass calibration 
(bidirectional, magnetic declination angle)

Altimeter:

Measurement range: –700 to 10,000 m (or –2,300 to 32,800 ft.) without reference altitude
Display range: –3,000 to 10,000 m (or –9,840 to 32,800 ft.)

 

Negative values can be caused by readings produced based on a reference altitude or due to 
atmospheric conditions.

Measurement Unit: 1 m (or 5 ft.)
Current Altitude Data: 1 hour - every second for the fi rst 3 minutes, followed by every 5 seconds for 

the remainder of the hour (

0'05

); 12 hours - every second for the fi rst 3 minutes, followed by 

every 2 minutes for the remainder of the 12 hours (

2'00

)

Other: Reference altitude setting; Altitude differential (–100 to +100m/–1,000 to +1,000m); Altitude 

measurement interval (

0'05

 or 

2'00

)

Thermometer:

Measurement and display range: –10.0 to 60.0°C (or 14.0 to 140.0°F)
Display unit: 0.1°C (or 0.2°F)
Other: Calibration

Pressure Sensor Precision:

Measurement accuracy: Within ±3hPa (0.1 inHg) (Altimeter accuracy: Within ± 75m (246 ft.))

 Values are guaranteed for a temperature range of –10°C to 40°C (14°F to 104°F).

 Precision is lessened by strong impact to either the watch or the sensor, and by temperature 

extremes.

E-110

Bearing Sensor Precision:

Direction: Within ±10°

 

Values are guaranteed for a temperature range of 10°C to 40°C (50°F to 104°F).

North indicated by second hand: Within ±2 segments

Temperature Sensor Precision:

±2°C (±3.6°F) in range of –10°C to 60°C (14.0°F to 140.0°F)

World Time:

 29 cities (29 time zones), UTC (Universal Time Coordinated); Home City/World Time City 

switching; one-touch UTC zone access

Other: Daylight Saving Time/Standard Time

Tide/Moon Data: 

Tide levels (Tide Graph), Moon age; date selection; time selection (Tide Graph only)

Stopwatch:

Measuring unit: 1/100 second
Measuring capacity: 23:59' 59.99"
Measuring modes: Elapsed time, split time, two fi nishes

Countdown Timer:

Measuring unit: 1 second
Countdown range: 60 minutes
Setting unit: 1 minute

Alarms:

 5 Daily alarms; Hourly time signal

Illumination:

 LED light; Selectable illumination duration (approximately 1.5 seconds or 3 seconds); Auto 

Light Switch (Full Auto Light operates only in the dark)

Other:

 Battery power indicator; Power Saving; Button operation tone on/off; alarm test; auto hand position 

adjustment; hand shift feature (to view digital info)

E-111

Power Supply:

 Solar panel and one rechargeable battery

Approximate battery operating time: 6 months (from full charge to Level 4) under the following 

conditions:

 Light: 1.5 seconds/day

 Beeper: 10 seconds/day

 Direction readings: 20 times/month

 Climbs: Once (approximately 1 hour of altitude readings)/month

 Barometric pressure change indicator readings: Approximately 24 hours/month 

 Barometric pressure graph: Readings every 2 hours

 Time calibration receive: 4 minutes/day

 Display: 18 hours/day

Frequent use of illumination runs down the battery. Particular care is required when using the auto 
light switch (page E-98).

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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