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Operation Guide 3420

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x

 The UTC differential is a value that indicates the time difference between a 
reference point in Greenwich, England and the time zone where a city is located.

The letters “UTC” is the abbreviation for “Coordinated Universal Time”, which is the 
world-wide scientifi c standard of timekeeping. It is based upon carefully maintained 
atomic (cesium) clocks that keep time accurately to within microseconds. Leap 
seconds are added or subtracted as necessary to keep UTC in sync with the Earth’s 
rotation.

 Illumination Precautions

 

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.

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Initial Screens

When you enter the World Time or Alarm Mode, the data you were viewing when you 
last exited the mode appears fi rst.

Timekeeping

 

x

 Resetting the seconds to 

 while the current count is in the range of 30 to 59 

causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are 
reset to 

 without changing the minutes.

The year can be set in the range of 2000 to 2099.

The watch’s built-in full automatic calendar makes allowances for different month 
lengths and leap years. Once you set the date, there should be no reason to change 
it except after you have the watch’s battery replaced.

World Time

All World Time Mode times are calculated from the current Home City time in the 
Timekeeping Mode using UTC time differential values.

 

x

 The seconds count of the World Time is synchronized with the seconds count of the 
Timekeeping Mode.

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Holding down 

C

 to turn the button operation tone on or off also causes the watch’s 

current mode to change.

 

x

 The mute indicator is displayed in all modes when the button operation tone is 
turned off.

Auto Return Features

 

x

 If you leave the watch in the Alarm Mode for two or three minutes without performing 
any operation, it automatically changes to the Timekeeping Mode.

 

x

 If you leave a screen with fl ashing digits on the display for two or three minutes 
without performing any operation, the watch automatically exits the setting screen.

Scrolling

The 

B

 and 

D

 buttons are used in various modes and setting screens to scroll 

through data on the display. In most cases, holding down these buttons during a scroll 
operation scrolls at high speed.

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Button Operation Tone

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 alarms, 
the Hourly Time Signal, the countdown alarm, and 
stopwatch auto start all operate normally.

To turn the button operation tone on and off

In any mode (except when a setting screen is on the 
display), hold down 

C

 to toggle the button operation tone 

on (mute indicator not displayed) and off (mute indicator 
displayed).

Mute indicator

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 Flash Alert

When Flash Alert is turned on, the illumination fl ashes for 
the alarms, the Hourly Time Signal, the countdown alarm, 
and stopwatch auto start.

To turn Flash Alert on and off

1.  In the Timekeeping Mode, hold down 

A

 for about two 

seconds until the current time fl ashes on the display. 
This is the setting screen.

2.  Press 

C

 eight times to display the Flash Alert setting screen.

3.  Press 

D

 to toggle Flash Alert on (

 displayed) and off (

 displayed).

4.  Press 

A

 to exit the setting screen.

The Flash Alert setting you select with the above procedure is applied in all modes.

When Flash Alert is on, 

 appears on the timekeeping screen for about one 

second whenever you enter the Stopwatch, Countdown Timer, or Alarm Mode.

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The following table shows the information that appears in graphic areas A and B.

Mode

Graphic Area A

Graphic Area B

Timekeeping

Timekeeping Mode seconds 
(10s unit)

Timekeeping Mode seconds 
(1s unit)

World Time

Timekeeping Mode seconds 
(10s unit)

Timekeeping Mode seconds 
(1s unit)

Stopwatch

Stopwatch time seconds

Stopwatch time seconds (1s unit)

Countdown Timer

Countdown time seconds

Countdown time seconds (1s unit)

Alarm

No indication

No indication

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 Reference

This section contains more detailed and technical information about watch operation. 
It also contains important precautions and notes about the various features and 
functions of this watch.

Graphic Areas

There are three graphic areas named A and B. The information shown in each graphic 
area depends on the current mode.

Graphic area B

Graphic area A

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Warning!

 

x

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

 

x

 When you are wearing the watch, make sure that operation of its auto light switch 
is disabled 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.

To enable and disable auto light switch operation

In the Timekeeping Mode, hold down 

B

 for about three seconds to toggle the auto 

light switch operation between enabled (auto light switch indicator display) and 
disabled (auto light switch indicator not displayed).

The auto light switch indicator is on the display in all modes while auto light switch 
operation is enabled.

To protect against running down the battery, auto light switch operation disables 
automatically approximately six hours after you enable it.

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About the Auto Light Switch

While the auto light switch is enabled, illumination turns 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 at more than 40 degrees causes illumination to turn on.

 

x

 Wear the watch on the outside of your wrist.

Parallel to ground 

More than 40° 

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x

 You can use the procedure below to select either 1.5 seconds or 3 seconds as 
the illumination duration. When you press 

L

, illumination will remain on for about 

1.5 seconds or 3 seconds, depending on the current illumination duration setting.

 To specify the illumination duration

1.  In the Timekeeping Mode, hold down 

A

 until the 

seconds start to fl ash, which indicates the setting 
screen.

2.  While the seconds are fl ashing, press 

B

 to toggle the 

setting between 1.5 seconds ( ) and 3 seconds ( ).

3.  Press 

A

 to exit the setting screen.

Summary of Contents for 3420

Page 1: ...isplayed in the Timekeeping Mode and World Time Mode are linked Because of this make sure you select a Home Time zone before you set the time and date Seconds Hour Minutes PM indicator Day of week Month Day E 5 C Stopwatch Mode Countdown Timer Mode Alarm Mode C C E 4 General Guide x Press C to change from mode to mode x In any mode except when a setting screen is on the display press L to illumina...

Page 2: ...l zeros in the Stopwatch Mode press B x This displays a 5 second countdown screen x To return to the all zeros screen press B again 2 Press D to start the countdown x When the countdown reaches zero a tone sounds and a stopwatch timing operation starts automatically x Pressing D while the Auto Start countdown is in progress immediately starts the stopwatch E 14 To measure times with the stopwatch ...

Page 3: ...et an alarm time 1 In the Alarm Mode use D or B to scroll through the alarm screens until the one whose time you want to set is displayed x To set a one time alarm display an alarm screen or To set the snooze alarm display the screen x The snooze alarm repeats every five minutes 2 After you select an alarm hold down A until the hour setting of the alarm time starts to flash which indicates the set...

Page 4: ...rent time flashes on the display This is the setting screen 2 Press C eight times to display the Flash Alert setting screen 3 Press D to toggle Flash Alert on displayed and off displayed 4 Press A to exit the setting screen x The Flash Alert setting you select with the above procedure is applied in all modes x When Flash Alert is on appears on the timekeeping screen for about one second whenever y...

Page 5: ...finishes Illumination LED light emitting diode Selectable illumination duration Auto Light Switch Other Button operation tone on off Flash alert Battery One lithium battery Type CR2032 Approximately 10 years on type CR2032 10 seconds of alarm operation per day one countdown timer operation with progress beeper per week one stopwatch operation with auto start per week 1 5 seconds of illumination pe...

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