Casio 5231 Operation Manual Download Page 6

Operation Guide 5231

E-59

Note

After performing home position adjustment, enter the Timekeeping Mode and check 
to make sure that the analog hands and the digital dial indicate the same time. If 
they do not, perform home position adjustment again.

E-58

 The watch will return to regular timekeeping automatically if you do not perform 

 

x

any operation for about two or three minutes. Any changes you have made to 
settings up to that point will be saved. 
If the hour and minute hands are all at 12 o’clock, which is their home position, 
jump to step 3.

 Use 

2. 

(+) and 

B

 (–) to adjust the hour and minute hand positions.

 Holding down either button will cause the hand to move at high speed. Once 

 

x

started, high-speed hand movement will continue even if you release the button. 
To stop high-speed hand movement, press any button.
 High-speed hand movement started with the 

 

x

D

 (+) button will stop 

automatically after 12 revolutions of the minute hand. If started with the 

B

 (–) 

button, it will stop after one revolution of the minute hand.

 Press 

3. 

A

 to exit home position correction and return to regular timekeeping.

E-57

Hand Home Position Adjustment

Strong magnetism or impact can cause the hands of the watch to be off.

 Home position adjustment is not necessary when the analog time and digital time 

 

x

are the same time in the Timekeeping Mode.

To adjust home positions manually

 In the Timekeeping Mode, hold down 

1. 

A

 and keep it depressed for about fi ve 

seconds until 

H.SET

 appears in the right digital dial.

 The hour and minute hands should all move to 12 o’clock, which is their home 

 

x

position.
 Though 

 

x

ADJ

 will appear in the right digital dial about two seconds after you hold 

down 

A

, do not release the button yet. Keep it depressed until 

H.SET

 appears. 

When 

H.SET

 appears in the right digital dial, release the 

A

 button. This will 

cause the hour and minute hands to move to 12 o’clock.

E-56

 You may notice a very faint clicking sound coming from the watch when it is 

 

x

shaken back and forth. This sound is caused by mechanical operation of the auto 
light switch, and does not indicate a problem with the watch.

E-55

Auto light switch precautions

 Wearing the watch on the inside of your wrist, movement of your arm, or vibration 

 

x

of your arm can cause frequent activation of the auto light switch and illumination 
of the face. To avoid running down the battery, turn off the auto light switch 
whenever engaging in activities that might cause frequent illumination of the face.
 Note that wearing the watch under your sleeve while the auto light switch is turned 

 

x

on can cause frequent illumination of the face and can run down the battery.

 Illumination may not turn on if the face of the watch is more than 

 

x

15 degrees above or below parallel. Make sure that the back of 
your hand is parallel to the ground.
 Illumination turns off after the preset illumination duration (page 

 

x

E-51), even if you keep the watch pointed towards your face.
 Static electricity or magnetic force can interfere with proper 

 

x

operation of the auto light switch. If illumination does not turn on, 
try moving the watch back to the starting position (parallel with the 
ground) and then tilt it back towards your face again. If this does 
not work, drop your arm all the way down so it hangs at your side, 
and then bring it back up again.

E-54

To turn the auto light switch on and off

In the Timekeeping Mode, hold down 

B

 for about 

three seconds to toggle the auto light switch on 
(indicator displayed in the right digital dial) and off 
(indicator not displayed).

 The auto light switch on indicator appears in all 

 

x

modes while the auto light switch is turned on.
 The auto light switch turns off automatically whenever 

 

x

battery power drops to Level 4 (page E-15).

Illumination Precautions

 LED panel that provides illumination loses power after very long use.

 

x

 Illumination may be hard to see when viewed under direct sunlight.

 

x

 Illumination turns off automatically whenever an alarm sounds.

 

x

 Frequent use of illumination runs down the battery.

 

x

Auto light switch on indicator

E-53

Warning!

 Always make sure you are in a safe place whenever you are reading the 

 

x

face of the watch using the auto light switch. Be especially careful when 
running or engaged in any other activity that can result in accident or 
injury. Also take care that sudden illumination by the auto light switch does 
not startle or distract others around you.
 When you are wearing the watch, make sure that its auto light switch is 

 

x

turned off before riding on a bicycle or operating a motorcycle or any other 
motor vehicle. Sudden and unintended operation of the auto light switch 
can create a distraction, which can result in a traffi c accident and serious 
personal injury.

Note

 This watch features a “LED”, so the auto light switch operates only when available 

 

x

light is below a certain level. It does not illuminate the face under bright light.

E-52

 After all of the settings are the way you want, press 

4. 

A

 to exit the setting mode.

 Exiting a setting mode will normally cause the hands to return to regular 

 

x

timekeeping automatically. However, if you manually move the hands (page 
E-61) and then enter a setting mode, they will not return to regular timekeeping 
automatically when you exit the setting mode. In this case, you will need to 
return the hands to their normal positions manually (page E-62).

About the Auto Light Switch

Turning on the auto light switch causes illumination 
to turn on, whenever you position your wrist as 
described below in any mode.

Moving the watch to a position that is parallel to 
the ground and then tilting it towards you more 
than 40 degrees causes illumination to turn on.

More than 
40°

Wear the watch on the 
outside of your wrist

E-51

 The above operation turns on illumination regardless of the current auto light switch 

 

x

setting.

To change the illumination duration

 In the Timekeeping Mode, hold down 

1. 

A

 for about two seconds until 

ADJ

 

appears in the right digital dial.
When you release 

A

, the city code and city name will scroll across the right 

digital dial. This is the setting mode.

 Whenever you enter a setting mode, the analog hands will automatically move to 

 

x

positions that allow easier viewing of the digital dials.

 Use 

2. 

C

 to cycle through the settings in the right digital dial until the current 

illumination duration (

LT1

 or 

LT3

) is shown.

 See the sequence in step 2 of the procedure under “To change the current 

 

x

time and date settings” (page E-31) for information about how to scroll through 
setting mode.

 Press 

3. 

D

 to toggle the illumination duration between three seconds (

LT3

 

displayed) and 1.5 seconds (

LT1

 displayed).

E-50

Illumination

The face of the watch is illuminated for easy reading in 
the dark.
The watch’s auto light switch turns on illumination 
automatically when you angle the watch towards your 
face.

 The auto light switch must be turned on (page E-54) for 

 

x

it to operate.

To turn on illumination manually

Press 

B

 in any mode to illuminate the face of the watch.

 You can use the procedure below to select either 

 

x

1.5 seconds or three seconds as the illumination 
duration. When you press 

B

, the face will remain 

illuminated for about 1.5 seconds or three seconds, 
depending on the current illumination duration setting.

Summary of Contents for 5231

Page 1: ... change the Daylight Saving Time summer time setting E 31 Configuring Current Time and Date Settings E 31 To change the current time and date settings E 6 2 Check the Home City and the daylight saving time DST setting Use the procedure under To configure Home City settings page E 26 to configure your Home City and daylight saving time settings Important Proper World Time Mode data depends on correct ...

Page 2: ... Leaving the watch exposed to direct sunlight or some other very strong light x 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 The current time and all other settings return to their initial factory defaults x whenever battery power drops to Level 5 and when yo...

Page 3: ...ut city codes see the City Code Table at the back of this x manual Whenever you enter a setting mode the analog hands will automatically move to x positions that allow easier viewing of the digital dials City code E 25 Timekeeping Use the Timekeeping Mode to set and view the current time and date If you have an alarm time set the right digital dial will x change to show a countdown of the final 60 ...

Page 4: ...nd off page E 63 Enabling and disabling power saving To turn Power Saving on and off page E 65 The illumination duration To change the illumination duration page E 51 E 34 Press 4 A to exit the setting mode The watch automatically adjusts its analog setting to match the current time x displayed in the left digital dial Exiting a setting mode will normally cause the hands to return to regular x tim...

Page 5: ...will cause the watch to beep twice every hour on the hour To enter the Alarm Mode Use C to select the Alarm Mode as shown on page E 23 The right digital dial will show x ALM for about one second and then the indictor for the currently selected alarm AL1 through AL5 or SIG will appear When you enter the Alarm Mode the data you were x viewing when you last exited the mode appears first Alarm number A...

Page 6: ...not displayed The auto light switch on indicator appears in all x modes while the auto light switch is turned on The auto light switch turns off automatically whenever x battery power drops to Level 4 page E 15 Illumination Precautions LED panel that provides illumination loses power after very long use x Illumination may be hard to see when viewed under direct sunlight x Illumination turns off au...

Page 7: ...utomatically move to positions that allow easier viewing of the digital dials Use 2 C to cycle through the settings in the right digital dial unit the current power saving setting PSON or PSOF is displayed See the sequence in step 2 of the procedure under To change the current x time and date settings page E 31 for information about how to scroll between settings Press 3 D to toggle Power Saving o...

Page 8: ... De Noronha 2 City Code City UTC Offset GMT Differential RAI Praia 1 UTC 0 LIS Lisbon LON London MAD Madrid 1 PAR Paris ROM Rome BER Berlin STO Stockholm ATH Athens 2 CAI Cairo JRS Jerusalem MOW Moscow 3 JED Jeddah THR Tehran 3 5 L 1 City Code Table E 70 Countdown Timer Measuring unit 1 second Countdown range 100 minutes Countdown start time setting range 1 to 100 minutes 1 second increments Alarm...

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