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Operation Guide 3259
E-88
Illumination
The display 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-90) for it to operate.
To turn on illumination manually
Press
L
in any mode to illuminate the display.
You can use the procedure below to select either 1.5 seconds or three
seconds as the illumination duration. When you press
L
, the display
will remain illuminated for about 1.5 seconds or three seconds,
depending on the current illumination duration setting.
The above operation turns on illumination regardless of the current
auto light switch setting.
Illumination is disabled while confi guring sensor measurement mode
settings, and during bearing sensor calibration.
To change the illumination duration
1. In the Timekeeping Mode, hold down
E
until
SET Hold
appears and on the display then the city code
starts to fl ash.
2. Use
D
to cycle through the settings on the display until the current illumination duration (
LT1
or
LT3
) is
shown.
See the sequence in step 2 of the procedure under “To change the current time and date
settings” (page E-23) for information about how to scroll through setting screens.
E-89
3. Press
A
to toggle the illumination duration between three seconds (
LT3
displayed) and 1.5 seconds
(
LT1
displayed).
4. After all of the settings are the way you want, press
E
to exit the setting screen.
To return to the screen in step 1, press
E
again.
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.
Warning!
Always make sure you are in a safe place whenever you are reading the display 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 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.
More than
40°
Wear the watch on the
outside of your wrist
More than
40°
Wear the watch on the
outside of your wrist
E-90
Note
This watch features a “Full Auto EL Light”, so the auto light switch operates only when available light is
below a certain level. It does not illuminate the display under bright light.
The auto light switch is always disabled, regardless of its on/off 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
While the Moon age or tide information is being calculated
To turn the auto light switch on and off
In the Timekeeping Mode, hold down
L
for about three seconds to toggle
the auto light switch on (
displayed) and off ( not displayed).
The auto light switch on indicator ( ) is on the display in all modes
while the auto light switch is turned on.
The auto light switch turns off automatically whenever battery power
drops to Level 4 (page E-11).
Auto light switch on
indicator
Auto light switch on
indicator
E-91
Illumination Precautions
The electro-luminescent panel that provides illumination loses power after very long use.
Illumination may be hard to see when viewed under direct sunlight.
Illumination turns off automatically whenever an alarm sounds.
Frequent use of illumination runs down the battery.
Auto light switch precautions
Wearing the watch on the inside of your wrist, movement of your arm, or vibration of your arm can
cause frequent activation of the auto light switch and illumination of the display. To avoid running down
the battery, turn off the auto light switch whenever engaging in activities that might cause frequent
illumination of the display.
Note that wearing the watch under your sleeve while the auto light switch is turned on can cause
frequent illumination of the display and can run down the battery.
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-88), 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-92
Other Settings
The button operation tone sounds any time you press one of the watch’s buttons. You can turn the button
operation tone on or off as desired.
Even if you turn off the button operation tone, the alarm, Hourly Time Signal, and Countdown Timer
Mode alarm all operate normally.
To turn the button operation tone on and off
1. In the Timekeeping Mode, hold down
E
until
SET Hold
appears on
the display and then the city code starts to fl ash.
2. Use
D
to cycle through settings on the display until the current button
operation tone (
MUTE
or
BEEP
) is displayed.
See the sequence in step 2 of the procedure under “To change the
current time and date settings” (page E-23) for information about
how to scroll through setting screens.
3.
Press
A
to toggle the button operation tone on (
BEEP
) and off (
MUTE
).
4. After all of the settings are the way you want, press
E
to exit the
setting screen.
To return to the screen in step 1, press
E
again.
Note
The mute indicator is displayed in all modes when the button
operation tone is turned off.
Mute indicatorMute indicator
E-93
To turn Power Saving on and off
1. In the Timekeeping Mode, hold down
E
until
SET Hold
appears on
the display and then the city code starts to fl ash.
2. Use
D
to cycle through the settings on the display until the the current
power saving setting (
On
or
OFF
) is displayed.
See the sequence in step 2 of the procedure under “To change the
current time and date settings” (page E-23) for information about
how to scroll through setting screens.
3. Press
A
to toggle Power Saving on (
On
) and off (
OFF
).
4. After all of the settings are the way you want, press
E
to exit the
setting screen.
To return to the screen in step 1, press
E
again.
Note
The Power Saving on indicator (PS) is on the display in all modes
while Power Saving is turned on.
Power saving
on indicator
Power saving
on indicator
E-94
Troubleshooting
Time Setting
The current time setting is off by hours.
Your Home City setting may be wrong (page E-20). Check your Home City setting and correct it, if
necessary.
The current time setting is off by one hour.
You may need to change your Home City's standard/daylight saving time (DST) setting. Use the
procedure under “To change the current time and date settings” (page E-22) to change the standard time/
daylight saving time (DST) setting.
Sensor modes
I can’t change the temperature, barometric pressure, and altitude units.
When
TYO
(Tokyo) is selected as the Home City, the altitude unit is set automatically to meters (m), the
barometric pressure unit to hectopascals (hPa), and the temperature unit to Celsius (°C). These settings
cannot be changed.
E-95
“ERR” appears on the display while I am using a sensor.
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 display and sensor operations will be disabled.
Digital
Compass
Measurement
Barometric
Pressure/Temperature
Measurement
Altitude
Measurement
If
ERR
appears while a measurement operation is being performed in a sensor mode, restart the measurement.
If
ERR
appears on the display again, it can mean there is something wrong with the sensor.
Even if battery power is at Level 1 (
H
) or Level 2 (
M
), the Digital Compass Mode, Barometer/
Thermometer Mode, or Altimeter Mode sensor may be disabled if there is not enough voltage available
to power it suffi ciently. In this case,
ERR
will appear on the display. This does not indicate malfunction,
and sensor operation should resume once battery voltage returns to its normal level.
If
ERR
keeps appearing during measurement, it could mean there is a problem with the applicable
sensor.
12


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