Casio 5251(OC) Operation Manual Download Page 5

Operation Guide 5251 (OC)

E-36

Specifi cations

Accuracy at normal temperature:

  

±

 15 seconds a month (with no signal calibration)

Timekeeping:

  Hour, minutes, seconds, day

Calendar system:  Full Auto-calendar pre-programmed from the year 2000 to 2099

Time Calibration  Signal Reception:

 Auto receive up to three times a day (Remaining auto receives 

cancelled as soon as one is successful); Manual receive

Receivable  Time Calibration Signals: 

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)

Other:

  Power Saving; Auto second hand home position correction

Power Supply:

  Solar panel and one rechargeable battery

Approximate battery operating time: 5 months (no exposure to light after a full charge; one signal 
reception of approximately 4 minutes per day)

E-35

 

Signal reception is being performed successfully, but the time is wrong.

Possible Cause

Remedy

Page

Your location setting is wrong.

Check your location setting and correct it, if 
necessary.

E-22

The watch may have been exposed to magnetism 
or strong impact, which has caused problems with 
proper hand alignment.

Adjust the watch’s hand home positions.

E-29

E-34

 

The 

x

 

Second Hand

 indicates N (NO) when I check the result of the latest receive operation.

Possible Cause

Remedy

Page

 You are wearing or moving the watch, or 

 

x

performing a button operation during the signal 
receive operation.

 The watch is in an area with poor reception 

 

x

conditions.

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

E-18

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

See “Approximate Reception Ranges”.

E-17

The calibration signal is not being transmitted for 
some reason.

 Check the website of the organization that 

 

x

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

 Try again later.

 

x

 

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-19), which will 
cause the time to be adjusted automatically according to your currently selected location. If this results in 
the wrong time setting, check your location setting and correct it, if necessary (page E-22).

 

Auto Receive is not performed or I cannot perform Manual Receive.

Possible Cause

Remedy

Page

Your location setting is wrong.

Check your location setting and correct it, if 
necessary.

E-22

There is not enough power for signal reception.

Expose the watch to light to charge it.

E-10

E-33

 Hand movement is stopped.

The watch may have been exposed to magnetism, which will cause the hands to stop at their current 
positions. Pull the crown out to the fi rst click or press a button to restart hand movement. If the indicated 
time is not correct, perform home position adjustment. See “Adjusting Home Positions Manually” (page 
E-29).

 

The current time setting is off by hours.

Your location setting may be wrong. Check your location setting and correct it, if necessary (page E-22).

 

The hands and/or day indications are off.

This could indicate that the watch has been exposed to magnetism or strong impact, which has caused 
problems with proper hand and day alignment. Adjust the watch’s hand and day home position alignment 
(page E-29).

Charging

 

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

This can happen after the battery charge level drops to Level 4 (page E-11). Continue exposing the watch 
to light until the 

x

 

Second Hand

 starts moving normally (at one-second intervals).

Time Calibration Signal

The information in this section applies only when 

CN

 (

HKG

HONG KONG

), or 

JP

 (

TYO

TOKYO

) is 

selected as the current location.

E-32

Troubleshooting

Hand Movement and Position

 

The 

x

 

Second Hand

 is moving in the pattern: 1 second 

 1 second 

 2 seconds.

The battery charge is starting to go low. Expose the watch to light to charge it. See “Charging the Watch” 
(page E-10).

 

The 

x

 

Second Hand

 is moving at two-second intervals.

 

All of the watch’s hands are stopped at 12 o’clock, and the 

A

 button and crown do not do 

anything.

The battery charge may be low. Expose the watch to light until the 

x

 

Second Hand

 starts moving 

normally, at one-second intervals (page E-11).

 

The hands of the watch suddenly start moving at high speed, even when I do not perform any 
operation.

This could be due to any one of the following causes. In all cases, the hand movement does not indicate 
malfunction, and should stop shortly.

 The watch is recovering from a sleep state (page E-15).

 

x

 The time setting is being adjusted following a successful auto time calibration signal receive operation 

 

x

(page E-16).

 Nothing happens when I rotate the crown.

Leaving the crown pulled out for more than two minutes without performing any operation will 
automatically cause the setting operation to become disabled. If this happens, press the crown back in 
and then pull it out again to confi gure settings. See “Crown Operations” (page E-4).

Summary of Contents for 5251(OC)

Page 1: ...ge E 24 and when performing x home position adjustment page E 29 E 4 Crown Operations The crown can be pulled out to one of two click positions Never apply undue force when pulling out the crown Important When pulling out the crown avoid using undue force which creates the risk of personal injury to your x fingers and fingernails and of watch malfunction First click For selecting the location settin...

Page 2: ... 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 Guide The charging guide causes the x Second Hand to perform movement that gives you a rough idea of whether the watch needs to be exposed to light in order to charg...

Page 3: ...en try again See To get ready for a receive operation page E 18 E 19 Signal reception may be difficult or even impossible under the conditions described below x Inside or among buildings Inside a vehicle Near household appliances office equipment or a mobile phone Near a construction site airport or other sources of electrical noise Near high tension power lines Among or behind mountains What you sh...

Page 4: ...n x 15 minutes 00 seconds Perform steps 7 8 9 and 10 of this procedure B E 28 After the tens digit setting is the way you want press 8 A The x x Second Hand will move to the ones digit of the current year setting Rotate the crown to move the 9 x Second Hand to the year ones digit setting you want Note If you want to continue on to the time setting press x A and then perform the procedure starting ...

Page 5: ...Cause Remedy Page Your location setting is wrong Check your location setting and correct it if necessary E 22 There is not enough power for signal reception Expose the watch to light to charge it E 10 E 33 Hand movement is stopped The watch may have been exposed to magnetism which will cause the hands to stop at their current positions Pull the crown out to the first click or press a button to res...

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