E-48
Note
•
The auto light switch is always disabled, regardless of its enabled/disabled setting, when any one of
the following conditions exists.
While an alarm is sounding
During sensor measurement
While a bearing sensor calibration operation is being performed in the Digital Compass Mode
To enable or disable the auto light switch
In the Timekeeping Mode, hold down
B
for about three seconds to
toggle the auto light switch between enabled (
LT
shown on the digital
display) and disabled (
LT
not displayed).
•
The auto light switch enabled indicator (
LT
) is on the digital display in
all modes while the auto light switch is enabled.
•
The auto light switch remains enabled for about six hours. After that
disables automatically.
Illumination Precautions
•
Do not look directly at the ultraviolet LED light source.
•
Never try to remove the ultraviolet LED from the watch and use it as a light source.
•
Do not use a lens or other object to concentrate the ultraviolet LED light.
•
Illumination may be hard to see when viewed under direct sunlight.
•
Illumination will not turn on while an alarm is sounding, while high-speed hand movement is in progress,
while a sensor is taking a reading. Illumination will turn on if
B
is pressed between sensor reading
operations.
Auto light switch
enabled indicator
Auto light switch
enabled indicator
E-49
•
Illumination turns off automatically whenever an alarm sounds.
•
Frequent use of illumination runs down the battery.
Auto light switch precautions
•
Illumination may not turn on if the face of the watch is more than 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 E-46), even if you
keep the watch pointed towards your face.
•
Static electricity or magnetic force can interfere with proper 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.
•
You may notice a very faint clicking sound coming from the watch when it is 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-50
Button Operation Tone
When enabled, the button operation tone sounds any time you press one of the watch’s buttons. You can
enable or disable the button operation tone as desired.
•
Even if you disable the button operation tone, the alarm, Hourly Time Signal, and Countdown Timer
Mode alarm all operate normally.
To enable or disable the button operation tone
1. In the Timekeeping Mode, hold down
A
until
ADJ
appears in the
digital display.
•
When you release
A
(after
ADJ
appears), the second hand will
move to the city code of the currently selected Home City. This is
the setting mode.
2. Use
D
to cycle through settings on the digital display until the current
button operation tone setting (
MUTE
or
KEY
) is shown.
•
See the sequence in step 2 of the procedure under “To change the
current time and date settings” (page E-15) for information about
how to scroll through setting screens.
3. Press
E
to toggle the button operation tone setting between enabled
(
KEY
) and disabled (
MUTE
).
4. After the setting is the way you want, press
A
to exit the setting
screen.
E-51
Moving the Hands for Easy Viewing of the Digital Dials
You can use the procedure below to move the analog hands in order to better view a digital dial.
Note
•
The analog hands will not move while battery power is low.
To move the hands and view the digital display, and to move them back
1. Hold down
B
and then, at the same time, hold down
D
.
•
This will cause the hands to move so you can read the digital display.
2. After you are fi nished reading the display, press
B
and
D
again to move the hands back to their
normal positions.
Hold down and .
E-52
Note
•
The hands automatically move away from the digital display whenever you enter a setting mode.
•
The hands return to their normal positions in the cases below.
– When you do not perform any operation for about one hour
– When the watch returns to the Timekeeping Mode because you press
D
or because of auto return
operation
– When you exit the setting mode
E-53
Locking the Watch Buttons
You can use button lock to disable the watch’s buttons and protect
against unintended operation.
•
The
B
(light) button remains enabled even while buttons are locked.
•
Buttons are locked in the Timekeeping Mode only.
To lock the watch buttons
In any mode, hold down
D
for about two seconds until the watch enters
the Timekeeping Mode. Keep
D
depressed as you press
C
.
•
Pressing any button other than the light button while buttons are locked
will cause a button lock indicator to appear momentarily on the digital
display.
To unlock the watch buttons
Press
D
and
C
at the same time.
Button lock indicator
Button lock indicator
E-54
Troubleshooting
Time Setting
■
Why is the current time setting off by a couple of hours?
Your Home City setting may be wrong (page E-13). Check your Home City setting and correct it, if
necessary.
■
Why is the current time setting off by one hour?
You may need to change your Home City’s standard time/daylight saving time (DST) setting. Use the
procedure under “To change the current time and date settings” (page E-15) to change the standard time/
daylight saving time (DST) setting.
Sensor modes
■
Why can’t I change the temperature unit setting?
The temperature unit setting is always Celsius (
°C
) whenever
TOKYO
is selected as the Home City. In
this case, the setting cannot be changed.
■
Why does “ERR” appear while a sensor operation is in progress?
Subjecting the watch to strong impact can cause sensor malfunction or improper contact of internal
circuitry. When this happens,
ERR
(error) will appear on the digital display and sensor operations will be
disabled.
E-55
Example:
Digital Compass
Operation
•
If
ERR
appears while a measurement operation is being performed in a sensor mode, restart the
measurement. If
ERR
appears on the digital display again, it can mean there is something wrong with
the sensor.
•
If
ERR
keeps appearing during measurement, it could mean there is a problem with the applicable
sensor.
Note
•
If
ERR
appear during a digital compass operation, the watch will return to the Timekeeping Mode
automatically after about 10 seconds.
■
Why does “ERR” appear on the digital display following bidirectional calibration?
If
- - -
appears and then changes to
ERR
(error) while you are performing sensor calibration, it means that
there is something wrong with the sensor.
•
If
ERR
disappears after about one second, try performing the calibration again.
•
If
ERR
keeps appearing, contact your original dealer or nearest authorized CASIO distributor to have
the watch checked.
Operation Guide 5366