Citizen CTZ-B8155, EC1 series, H24 series Instruction Manual

Thank you for your purchase of this Citizen watch.
Before using the watch, read this instruction manual carefully to ensure correct use.
After reading the manual, store it in a safe place for future reference.
Visit the Citizen website (http://www.citizenwatch-global.com/) to view visual guides

for operation of your watch. Some models may be equipped with external features
(calculation scale, tachymeter, etc.). Visual guides for operation of such external
features can also be found on the website.

To check the movement number

A case number—4 alphanumeric characters and 6
or more alphanumeric characters—is engraved on
the case back. (Figure on the right)

The first 4 characters of the case number represent
the movement number of the watch.

In the example on the right, “ ” is the
movement number.

Engraving position example

The engraving position may differ
depending on watch model.

Safety precautions — IMPORTANT

This manual may contain certain safety advisories. Your watch should be used in
accordance with these advisories at all times to ensure optimal enjoyment of your
watch and to prevent injury to yourself, other persons and/or damage to property.
Understand the meaning of the following symbols and read pages from 56 to 69.

■ Safety advisories are categorized and depicted in this manual as follows:

DANGER

WARNING

CAUTION

■ Important instructions are categorized and depicted in this manual as follows:

Highly likely to cause death or serious injury

Can cause serious injury or death

Can or will cause minor or moderate injury or damage

Warning (caution) symbol followed by instructions that should be
followed or precautions that should be observed.

Warning (caution) symbol followed by prohibited matters.

2

Before using the watch

The following must be done before using the watch:

●

Checking the power reserve Page

Check the charge level of the watch.

●

Setting the World Time Page

Select the city or time difference for which you want to indicate the time and date.

●

Checking the time signal reception Page

Check the result of the time signal reception.

This watch has a rechargeable cell which is charged
by exposing the dial to light.

Expose the dial to direct sunlight regularly to charge
the watch.
For details of charging, see pages 9 to 15.

16

18

17

Before using the watch Before using the watch

Band adjustment

We recommend seeking the assistance of an experienced watch technician for sizing of
your watch. If adjustment is not done correctly, the bracelet may unexpectedly become
detached leading to loss of your watch or injury.
Consult your nearest an authorized service center.

Protective stickers

Be sure to remove any protective stickers that may be on your watch (case back, band,
clasp, etc.). Otherwise, perspiration or moisture may enter the gaps between the
protective stickers and the parts, which may result in a skin rash and/or corrosion of
the metal parts.

How to use a specially designed crown/button

Some models are equipped with a specially designed crown and/or push button to
prevent accidental operation.

4 5

Screw down crown/button

Unlock the crown/button prior to operate your watch.

Unlock Lock

Screw down
crown

Screw down
push button

Rotate the crown
counterclockwise until it
releases from the case.

Rotate the locking screw
counterclockwise, and
loosen until it stops.

Recessed buttons

Press the button with a non-marring narrow-tipped
object such as a wooden toothpick.

• Metal objects may cause marring or scratching of the
button.

Push the crown in to the
case. With gentle pressure
towards the case, rotate the
crown clockwise to secure
it to the case. Be sure to
tighten firmly.

Rotate the locking screw
clockwise, and tighten
fi rml y.

Table of contents

Before using the watch ...............

Component identification ...........

Recharging your watch................

Checking the power reserve .......

Checking the time signal

reception ...............................

Setting the World Time .............

6

3

Notes on the time signal

reception ...............................

8

Receiving the time signal manually

9

(On demand reception) ...........

16

Switching Summer Time and

standard time ........................

17

Adjusting the time/calendar

18

manually ................................

26

34

36

42

Checking and correcting the current

reference position ..................

46

Precautions and usage

limitations .............................

63

Troubleshooting .......................

Resetting the watch

—All Reset ............................

Eco-Drive Watch Handling

Precautions ............................

Water resistance .......................

50

Specifications ............................

54

56

60

70

Component identification

Signal reception indication

• OK/NO: Reception result

• RX: Reception in progress

Minute hand

Crown

Hour hand

Summer Time indication
(ON/OFF)

Second hand

Crown position

Date indication

Lower right button ( )

City or time difference
indication

The illustrations in this instruction manual may differ from the actual appearance of your
watch.

8

Recharging your watch

This watch has a rechargeable cell which is charged by
exposing the dial to light, such as direct sunlight or
fluorescent lamps.
After taking off the watch, put it in a location where the dial
is exposed to bright light, such as by a window.

Recharging your watch Recharging your watch

The charge of the watch is low if the second
hand rotates counterclockwise when you

check the power reserve (page 16) or the
time signal reception (page 17).
You can operate the watch as usual.
However, the watch needs to be charged.

After rotating
counterclockwise ...

Indicates the
reception result

10 11

In addition, for optimal performance, perform the following:

• Expose the watch with the dial facing towards direct sunlight for five to six hours
at least once a month.

• Avoid leaving the watch in a dark place for long periods of time.

Caution

• When the watch is regularly covered with long sleeves, it may not be charged
sufficiently. Try to keep the watch exposed to light sufficient for charging.

• Do not charge the watch at a high temperature (about 60˚C (140˚F) or higher).

Recharging your watch Recharging your watch

Charging time by environment

Below are the approximate times required for charging when exposing the watch dial
to light continuously. Please use this table as a reference only.

Environment

Outdoors (sunny) 100,000

Outdoors (cloudy) 10,000

20 cm (7-7/8
inches) away from
a fluorescent lamp

(30W)

Interior lighting 500

Illuminance

(lx)

3,000

To work for

one day

4 minutes 1.5 hours 25 hours

14 minutes 4 hour 60 hours

40 minutes 12 hours 150 hours

4 hours 80 hours

Charging time (approx.)

To start working

normally when the cell is

discharged

To become fully charged

when the cell is discharged

12 13

To charge the rechargeable cell fully, it is recommended to expose the dial to

direct sunlight. A fluorescent lamp or interior lighting does not have sufficient

illumination to charge the rechargeable cell fully.

• When fully charged, the overcharging prevention function works automatically.

The accuracy or parts of the watch will not be affected by extra charging.

Run time

Fully charged to fully discharged:

Approximately six months (at normal operation)
Approximately three years (with power save feature)

Recharging your watch Recharging your watch

When the watch reaches a low charge state—insufficient charge warning
function

When the power reserve becomes low, the second hand
moves once every two seconds—This is the insufficient
charge warning function. Charge the watch by exposing
the dial to light.

• When the watch is sufficiently charged, the second hand
will move normally.

• If you have not charged the watch for several days since
the insufficient charge warning movement began, the
watch will run out of power and stop.

Caution

Even when the second hand moves once every two seconds, the current time and
date are indicated. However, operations and signal reception are not possible.

14 15

Power save feature

When the watch is not exposed to light for a long period of time, such as when you
store it in the dark, the minute hand and second hand automatically stop to save
power. However, the watch still keeps the time.

• When the crown is in position or , the power save feature will not activate.

• The power save feature can not be activated manually.

To cancel the power save feature

When the watch is exposed to light sufficient for charging, the power save feature is
automatically canceled and normal time indication will resume.
After the power save feature is canceled, you should receive the time signal manually.
See pages 34 and 35.

• The power save feature cannot be canceled by operating the crown or buttons.

Checking the power reserve

1. Ensure that the crown is in position .

2. Press the lower right button briefly.

The second hand moves to indicate the power reserve.

The second hand
indicates “OK” or “NO”

The second hand rotates
counterclockwise, then
indicates “OK” or “NO”

• “OK” and “NO” indicate the reception result of the
time signal and no relationship to the power reserve.

3. Press the lower right button briefly to finish the
procedure.

The current time is indicated.

• The current time will be indicated automatically after

10 seconds even without pressing the button.

16

The watch is sufficiently
charged.

The charge of the watch is low.
Charge the watch. See pages 9
to 15.

Checking the time signal reception

1. Ensure that the crown is in position .

2. Press the lower right button briefly.

The second hand indicates the
reception result.

Reception has succeeded.

OK

Reception has failed.

NO

When reception has failed, see
page 32.

3. Press the lower right button
briefly to finish the procedure.

The current time is indicated.

• The current time will be indicated automatically after
10 seconds even without pressing the button.

When reception
has succeeded

Setting the World Time

By setting the city or time difference from UTC, the local time and date is shown.
Select the city or time difference to indicate the current time and date.

• Whether you select the city or time difference depends on the appearance of your
watch.

Watch appearance for setting the city Watch appearance for setting the time difference

City indication

See pages 19 and 22 to 25. See pages 20 to 25.

Time difference indication

18 19

Setting the World Time

Setting the city

Select the city for which you want to indicate the time and date.

1. Pull the crown out to position .

The second hand moves and indicates the city currently
selected.

2. Rotate the crown to select
the city for which you want to
indicate the time and date.

• For details of the selection of

cities, see pages 23 to 25.

• Each time you select a city, the

time and date of the city you have
selected will be indicated.

3. Push the crown in to position

When “New York” (47
seconds position) is
selected

to finish the procedure.

After setting the World Time, check the displayed time—Summer Time or standard
time. (See pages 36 to 41.)

Setting the World Time Setting the World Time

Setting the time difference

1. Pull the crown out to position .

The second hand moves and indicates the time
difference currently selected.

2. Rotate the crown to select the time difference.

• You can select

the time
difference from
UTC in the
range of –11
hours to +12
hours, in 1hour
increments.

– +

When setting to –5 hours (New York)

20 21

3. Push the crown in to position to finish the procedure.

• Be sure to set the time difference from UTC. To show the summer time, change the
display after setting the time difference. (See pages 36 to 41.)

• See the tables on pages 23 to 25 for the time differences for typical cities.

Setting the World Time Setting the World Time

Table of selectable cities/time differences

• The signal station changes depending on the selected city/time difference.

• Cities out of receivable range cannot receive the signal though a signal station is
assigned in the list.

• For cities indicated by *, the watch shows Summer Time/standard time in common.

• For cities indicated by **, the watch shows Summer Time/standard time in
common.

• The time difference in the table below is based on UTC.

• The standard time for each area or country may change according to their situation.

<When your watch has city indication>

• The indications in the table below are written differently on some models.

• When you use the watch in a place which is not shown in the table below, select the
city in the same time zone as the city you want to indicate.

• The city of ◆ is outside the reception range and signals cannot be received. (The
watch will attempt to receive signals from each station at the appointed time.)
If necessary, summer time setting can be done manually.

22 23

Typical city Time zone

London 0 London LON 0

*

Paris +1 Paris PAR 3

*

Athe ns +2 Athens AT H 5

*

City indication or second hand

position

◆

Dubai +4 Dubai DXB 10
Karachi +5 Karachi KHI 13

Bangkok +7 Bangkok BKK 17
Beijing +8 Beijing BJS 20 China

Continued on the next page

Signal

station

Germany

GermanyRiyadh +3 Riyadh RUH 8

ChinaDhaka +6 Dhaka DAC 15

◆

Setting the World Time Setting the World Time

Typical city Time zone

Tok yo +9 To kyo TYO 22 Japan

Sydney +10 Sydney SYD 25

Noumea +11 Noumea NOU 27

Auck land +12 Auckland AKL 30
Midway Island –11 Midway MDY 33
Honolulu –10 Honolulu HNL 35

Anchorage –9 Anchorage ANC 38

**

Los Angeles –8 L.Angeles LAX 40

**

Denver –7 Denver DEN 43

**

Chicago –6 Chicago CHI 45

**

Ne w Yor k –5 New York NYC 47

**

City indication or second hand

position

Signal

station

Japan

◆

USA

◆

USA

USA

◆

24 25

Typical city Time zone

Santiago -4 Santiago SCL 50

Rio de Janeiro -3 R.Janeiro RIO 52

Fernando de
Noronha

Azores

*

(Ponta Delgada)

• Please refer to page 22.

• The city of ◆ is outside the reception range and signals cannot be received.
(The watch will attempt to receive signals from each station at the appointed time.)
If necessary, summer time setting can be done manually.

City indication or second hand

-2 F.Noronha FEN 55

-1 Azores PDL 57

position

Signal

station

USA

◆

Germany

◆

Notes on the time signal reception

Receiving the time signal

There are three ways to receive the time signal:

• The second hand indicates the reception result (OK/NO). (See page 17.)

Methods Explanations

Automatic reception Receives the signal every night.

On demand reception

Recovery automatic

reception

* These reception methods are possible only when the crown is in position .

• The watch will not receive the time signal when in a low charge state as indicated
by the second hand moving in two second increments (the insufficient charge
warning). Charge the watch before reception.

Receives the signal when you want to adjust the time and
date. See page 34.

Automatically receives the signal once after charging
when the watch stops due to insufficient charge.

26 27

Notes on the time signal reception

• The automatic reception function and recovery automatic reception function cannot
be deactivated.

• Even when this watch receives the time signal successfully, the accuracy of the
displayed time will be dependent on the reception environment and internal
processing.

• If the watch is not able to receive the signal, it will operate normally within an
accuracy range of ±15 seconds per month.

When receiving the time signal

Remove the watch and place it on a stable surface
where it can receive the signal better, such as next
to a window.

• The reception antenna is located at the 9:00
position of the watch. Place the watch with the
9:00 position facing toward the station.

• Do not move the watch during time signal
reception.

Notes on the time signal reception Notes on the time signal reception

Note on the time signal

This watch receives the time signal from one of the five signal stations located in four
regions. The receivable signal stations are listed as follows:

Signal stations Kind of the time signal

Fukushima station, Japan

Kyushu station, Japan

Fort Collins station, Denver, Colorado, USA WWVB

Mainflingen station, Southeast Frankfurt, Germany DCF77

Shangqiu station, Henan, China BPC

Refer to the maps on pages 29 to 31 to see the locations of the signal stations and their
receivable area roughly.

• Either signal station in Japan is automatically selected for receiving the JJY signal
(Automatic selection of time signal stations).

The time signal has no effect on the human body or medical equipment.

JJY

28 29

Approximate receivable area

The distance of receivable range is only used as an approximate value. It is often affected
by the receiving environment and weather. The receivable range is often affected by the
following conditions: receiving environment, time, weather (lightning), and so on.

JJY (Japan):

Approx. 1000 km
Kyushu station

JJY (Japan):

Approx. 1000 km
Fukushima station

Continued on the next page

Notes on the time signal reception Notes on the time signal reception

The distance of receivable range is only used as an approximate value. It is often affected
by the receiving environment and weather. The receivable range is often affected by the
following conditions: receiving environment, time, weather (lightning), and so on.

WWVB (USA):

Approx. 1500 km
Fort Collins station

30 31

The distance of receivable range is only used as an approximate value. It is often affected
by the receiving environment and weather. The receivable range is often affected by the
following conditions: receiving environment, time, weather (lightning), and so on.

BPC (China):

Approx. 1400 km
Shangqiu station

DCF77 (Germany):

Approx. 1000 km
Mainflingen station

Notes on the time signal reception Notes on the time signal reception

When signal reception is poor

High-tension electrical lines or other structures near your house may block the path to
the signal station. This may result in a poor environment for receiving the time signal.
With reference to pages 29 to 31, search for a better place for reception. Then, attempt
to receive the time signal following the procedure on pages

• If the window contains a wire netting in it, the signal reception may become poor.

34

and

35

.

32 33

Poor reception areas

It may be difficult to receive the time signal properly under certain environmental
conditions or in areas susceptible to radio noise.

• Extremely hot or cold
locations

• Near high-tension electrical
lines, railway overhead wires or
communication facilities

• Inside vehicles

• Near electrical equipment or
office appliances

• Inside reinforced concrete
buildings, between tall buildings,
mountains, or underground

• Near mobile phones that are in
use

Receiving the time signal manually (On demand reception)

You can adjust the watch by receiving the time signal any
time when the time and date are not correct or the reception
result is “NO.”

• The watch will not start to receive if the second hand is
moving once every two seconds (this is the insufficient
charge warning). Charge the watch beforehand.

• Before starting reception, confirm that the appropriate
city or time difference is selected for receiving the signal.
See pages 18 to 25.

34 35

Receiving the time signal manually (On demand reception)

1. Ensure that the crown is in position .

2. Press and hold the lower right button for two or more seconds.

The second hand moves to “RX” and the watch starts
receiving.
After receiving the time signal, the second hand will move
normally.

• It takes from two to fifteen minutes to complete the time
signal reception.

Successful signal
reception

Failed signal
reception

The time will be updated and the
watch will resume normal operation.

Normal operation resumes with the
previously set time.

While receiving the
signal

To cancel the reception

Press and hold the lower right button for two or more seconds.

Cancel the reception and the current time will be indicated.

Switching Summer Time and standard time

Summer Time is a system adopted in some countries/areas to gain an extra hour of
daylight during summer by advancing clocks by one hour.

• The summer time rules may change depending on the country or area.

• While the summer time is in effect, some time signals include the summer time
check signal.

• By receiving the time signal, the watch automatically switches between Summer
Time and standard time in accordance with the summer time check signal (automatic
switching function).

• Before and after the summer time season, confirm the watch shows Summer Time
or standard time correctly.

36 37

Switching Summer Time and standard time

Checking the time currently shown

Check whether the watch shows Summer Time or standard time.

1. Pull the crown out to position .

The second hand moves and
indicates which time is currently
shown.

SummerTime is shown

ON

The standard time is

OFF

shown

2. Push the crown in to position
to finish the procedure.

To change the time to show, see page 38.

When Summer Time is
shown

Switching Summer Time and standard time Switching Summer Time and standard time

Changing the time to show

1. Pull the crown out to position .

2. Rotate the crown to change the time to show.

To show Summer Time:

Rotate the crown to the right to select “ON.”

To show the standard time:

Rotate the crown to the left to select “OFF.”

• If you show the standard time manually, the watch
will not show Summer Time when receiving the
time signal. See page 40.

3. Push the crown in to position to finish the
procedure.

38 39

<The time shown for each city>

The watch shows and memorizes Summer Time/standard time in common for the
following cities/time differences in each area so you do not need to change them for
each city/time differences.

• If you show the standard time manually for a city/time differences, the watch always
shows the standard time for that city/time difference regardless of the time shown
for others in the same area.

Areas receiving the signal from USA Areas receiving the signal from Germany

City Time

Anchorage/ANC (Anchorage),
L. Angeles/LAX (Los Angeles),
Denver/DEN (Denver),
Chicago/CHI (Chicago),
New York/NYC (New York)

For cities/time differences other than those listed above, the time shown last is
memorized for each.

difference

−9

−8

−7

−6

−5

London/LON (London),
Paris/PAR (Paris),
Athens/ATH (Athens),
Azores/PDL
(Azores/Ponta Delgada)

City Time

difference

0
+1
+2
–1

Switching Summer Time and standard time Switching Summer Time and standard time

To cancel the automatic switching function

If you manually show the standard time in step 2 on page 38, the automatic switching
function is deactivated and the watch will not show Summer Time by signal reception.
If you are in an area that receives the summer time check signal but does not adopt
Summer Time, deactivate the automatic switching function.

40 41

To activate the automatic switching function again

Select “ON” in step 2 on page 38 to show Summer Time.

• This operation also activates the automatic switching function.

• If you activate the automatic switching function when Summer Time season is not
in effect, receive the time signal to show the standard time.

Adjusting the time/calendar manually

1. Pull the crown out to position .

2. Press the lower right button briefly.

The second hand moves to the 0 second position.

3. Rotate the crown to adjust the minute.

• The second hand rotates around once and the minute
hand moves one minute.

• When it passes “0:00:00,” the date advances by one
da y.
Be aware of the AM/PM status when you adjust the
time.

• If you spin the crown quickly a few times, the hand
will move continuously. To stop it, rotate the crown in
either direction.

4. Press the lower right button briefly.

The hour hand moves slightly.

42 43

Adjusting the time/calendar manually

5. Rotate the crown to adjust the hour and date.

• The hour hand and the date indication work together.

• If you spin the crown quickly a few times, the hand will move continuously. To
stop it, rotate the crown in either direction.

6. Press the lower right button briefly.

The second hand indicates the current setting of the month and year.

7. Rotate the crown to adjust the month and year.

• See pages 44 and 45 for how to read the month and year.

8. Push the crown in to position to finish the procedure.

The time and date are indicated.

Adjusting the time/calendar manually Adjusting the time/calendar manually

Month and year indications

The year and month are indicated by the second hand when you adjust the time and
calendar manually. The date is corrected automatically at the end of each month if the
number of years passed since the last leap year and month are set correctly.

Dec.

Nov.

Oct.

Sept.

Aug.

Jul.

The position of the second hand shows
the month.

Jan.

Feb.

Ma r.

e.g.

Apr.

MayJun.

When it is April in the second year since the last
leap year.

Each minute mark denotes the number of years
since the last leap year.

3rd year since leap year

Leap year

1st year since leap
year

2nd year since leap
year

44 45

The figure shows February
in the 3rd year since the last
leap year.

The figure shows September
in the 2nd year since the last
leap year.

Quick reference chart for the number of years passed since the last leap year

Indication of the second hand Passed year Year

Hour marker Leap year 2016, 2020, 2024

1st min. marker 1st year 2017, 2021, 2025

2nd min. marker 2nd year 2018, 2022, 2026

3rd min. marker 3rd year 2019, 2023, 2027

Checking and correcting the current reference position

If the time or date is not shown correctly even after proper reception of the time
signal, check whether the reference position is correct or not.

What is the reference position?

The base position for all the hands to
indicate the time and date.

• For the time indication: “0:00:00”

• For the date indication: Between “31”
and “1”

If the time and date indications are off from
the correct reference position, the watch will
not indicate the time and date correctly.

Correct reference position

46 47

Checking and correcting the current reference position

1. Pull the crown out to position .

2. Press and hold the lower right button for five or

more seconds.

All hands and the date indication move to indicate the
current reference position.

• No operations are available while the hands and date
indication are moving.

Reference position Next operation

Correct

Incorrect Correct the reference position.

Push the crown in to position
to finish the procedure.
(You do not need to correct the
reference position.)

(Proceed to step 3 on page 48.)

Continued on the next page

Checking and correcting the current reference position Checking and correcting the current reference position

3. Pull the crown out to position .

The hour hand moves slightly.

4. Rotate the crown to adjust the hour hand to the
“0:00:00” position and the date indication to the
halfway between “31” and “1.”

• The hour hand and the date

indication work together.

• If you spin the crown quickly a

few times, the hand will move
continuously. To stop it, rotate the
crown in either direction.

48 49

5. Press the lower right button briefly.

The minute hand and second hand move slightly.

• The hands may not move when they are already set to the correct position.

6. Rotate the crown to adjust the minute hand and second hand to the
“0:00:00” position.

• When the hands are already set to the correct position, you cannot make

adjustments. If they are not set to the correct position, make adjustments
manually. If you cannot make adjustments manually, contact our customer
service center.

7. Push the crown in to position to finish the procedure.

Correction of the reference position is finished and the time is indicated.

Troubleshooting

If you have a problem with your watch, check the table below.

Symptoms Remedies Page

Problems with time signal reception.

Reception is
unsuccessful in a
receivable area.

Push the crown in to position .

Check the World Time setting.

Avoid things likely to interfere with the time signal and
place the watch with the 9:00 position facing toward the
station.

Do not move the watch until the reception has finished.

When the second hand moves once every two seconds,
the watch cannot receive the time signal. Charge the
watch.

27

18

9

−

to

and

27

to

25

32

15

50 5150 51

Troubleshooting

Symptoms Remedies Page

The correct time and date
are not indicated after
successful reception.

The hands do not work properly.

The second hand rotates
counterclockwise when
you check the reception
result.

The second hand moves
once every two seconds.

All hands stop moving.

Check the World Time setting.

Check and correct the current reference position.

Charge the watch.

Charge the watch.

Push the crown in to position .

Charge the watch by exposing it to direct sunlight for
five to six hours.

18

46 to 49

to

9

to

9

to

9

Continued on the next page

to

25

15

15

−

15

Troubleshooting Troubleshooting

Symptoms Remedies Page

The hands do not work properly.

The hands start turning
rapidly as you take the
watch out of the case.

The time and/or date is incorrect.

The time and/or date is
incorrect.

Summer Time is not
shown.

The watch is canceling the power save feature. Wait
until the rapid movement stops.

Check the World Time setting.

Check and correct the current reference position.

Receive the time signal manually to adjust the time
and date.

Set the time and date manually.

Select “ON” manually or receive the time signal.

15

to

18

46 to 49

and

34

42 to 45

36 to 41

25

35

52 5352 53

Symptoms Remedies Page

The time is incorrect even
though the Wold Time
setting is correct and
the signal reception was
successful.

The date changes at around
12:00 p.m.

Others

The hands do not move
even if the watch is
charged.

Check the displayed time—Summer Time or the
standard time—and change it if necessary.

Check and correct the current reference position.

Receive the time signal manually to adjust the time
and date.

Adjust the time by 12 hours manually.

Charge the watch by exposing it to direct sunlight
for five to six hours.
If the problem is not solved after charging, consult
an authorized service center or the store where you
purchased your watch.

36 to 41

46 to 49

and

34

42 to 45

to

9

35

15

Troubleshooting Troubleshooting

Resetting the watch—All Reset

The watch may not work properly if it is affected by strong
shock or static electricity; the hands do not stop or the watch
does not work though the watch is sufficiently charged. In
this case, perform All Reset.

Caution

• Be sure to charge the watch fully before performing All
Reset. (Pages 9 to 15)

• After performing All Reset, the settings change
as follows. You must correct the current reference
position, then World Time setting and time before
using the watch.

• Calendar: January (leap year)

• World Time City: London

• Summer time: “OFF” for all cities/time differences

Time difference: ±0 hours (UTC)

(automatic switching)

54 5554 55

1.

Pull the crown out to position .

2.

Press the button for seven or more seconds, then release it.
When all the hands have stopped moving, the watch has been reset.

• It may take up to approximately 6 minutes until all the hands stop. This is not a
malfunction.

• If the hands do not move, perform step 2 again.

After performing All Reset

You must set the watch again following the procedure below.

1. Correct the current reference
position.

After performing All Reset, the watch
is in reference position correction
mode.
See from step 4 on page 48.

2. Set the World Time.

See pages

18 to 25

.

3. Adjust the time/calendar.

• When adjusting by receiving the
time signal manually:

See pages 34 and 35.

• When adjusting manually:

See pages 42 to 45.

Eco-Drive Watch Handling Precautions

<Always Make Sure to Recharge Frequently>

• For optimal performance, your watch should remain fully charged.

• Long sleeves may inhibit light transmission to your watch. This may
result in your watch loosing charge. In these cases supplemental
charging may be necessary.

• When you take off the watch, place it in a bright location to ensure
optimal performance.

56 57

Eco-Drive Watch Handling Precautions

CAUTION

• Do not charge the watch at a high temperature (about 60 °C

(140 °F) or higher) as doing so may cause the movement to
malfunction.

Examples:

• Charging the watch too close to a light source which
generates a large amount of heat such as an incandescent
lamp or halogen lamp.
* When charging under an incandescent lamp, be sure to

leave 50 cm (20 inches) or more between the lamp and the
watch to avoid exposing the watch to excessive heat.

• Charging the watch in a location where the temperature
may become extremely high such as on the dashboard of a
vehicle.

Recharging Precautions

Eco-Drive Watch Handling Precautions Eco-Drive Watch Handling Precautions

<Replacement of Rechargeable Cell>

• This watch utilizes a special rechargeable cell that does not require periodical replacement.
However power consumption may increase after using the watch for a number of years due to wear
of internal components and deterioration of oils. This may cause stored power to be depleted at a
faster rate. For optimal performance, we recommend having your watch inspected every 2-3 years
for proper operation and condition check.

WARNING

• The rechargeable cell should never be removed from the watch.
If for any reason it becomes necessary to remove the rechargeable cell from the watch, keep out of
the reach of children to prevent accidental swallowing.
If the rechargeable cell is accidentally swallowed, consult a doctor immediately.

• Do not dispose of the rechargeable cell with ordinary garbage. Please follow the instructions of
your municipality regarding collection of batteries to prevent the risk of fire or environmental
contamination.

Handling of Rechargeable Cell

58 59

WARNING

• Never use a battery other than the rechargeable cell specified for use in this watch.
Although the watch structure is designed so that it will not operate when another type of battery is
installed, if a conventional watch battery or other type of battery is installed in the watch and the
watch is recharged, there is the risk of overcharging which may cause the battery to rupture.
This can cause damage to the watch and injury to the wearer.
When replacing the rechargeable cell, always make sure to use the designated rechargeable cell.

Use Only the Specified Battery

Water resistance

WARNING

• Refer to the watch dial and/or the case back for the indication of the water resistance of your
watch. The following chart provides examples of use for reference to ensure that your watch is used
properly. (The unit “1 bar” is roughly equal to 1 atmosphere.)

• WATER RESIST(ANT) ×× bar may also be indicated as W. R. ×× bar.

Water Resistance

Name

Non-water resistant — Non-water resistant

Everyday-use water resistant

watch

Upgraded everyday use water-

resistant watch

Indication

Dial or Case back

WATER RESIST

W. R. 5 bar

W. R. 10/20 bar

Specification

Water-resistant to 3

atmospheres

Water-resistant to 5

atmospheres

Water-resistant to 10 or 20

atmospheres

60 61

Water-related use

Water resistance

Minor exposure

to water (washing

face, rain, etc.)

Swimming and

general washing

work

Skin diving,

marine sports

Scuba diving using

an air tank

NO NO NO NO NO

OK NO NO NO NO

OK OK NO NO NO

OK OK OK NO NO

Operate the crown

or button when
the watch is wet

Water resistance

• Non-water resistant models are not designed to come into contact with any moisture. Take care not
to expose a watch with this rating to any type of moisture.

• Water resistance for daily use (to 3 atmospheres) means the watch is water resistant for occasional
accidental splashing.

• Upgraded water-resistance for daily use (to 5 atmospheres) means that the watch may be worn
while swimming, but is not to worn while skin diving.

• Upgraded water-resistance for daily use (to 10/20 atmospheres) means that the watch may be worn
while skin diving, but not while scuba or saturated diving using helium gas.

62

Precautions and usage limitations

CAUTION

• Be particularly careful when wearing your watch while holding a small child, to avoid injury.

• Be particularly careful when engaged in strenuous exercise or work, to avoid injury to yourself and
others.

• Do not wear your watch while in a sauna or other location where your watch may become
excessively hot, since there is the risk of burns.

• Be careful when putting on and taking off your watch, since there is a risk of damaging your
fingernails, depending on the manner in which the band is fastened.

• Take off your watch before going to bed.

To Avoid Injury

Precautions and usage limitations Precautions and usage limitations

CAUTION

• Always use the watch with the crown pushed in (normal position). If the crown is of the screw
lock-type, make sure it is securely locked.

• Do not operate the crown or any push buttons when the watch is wet. Water may enter the watch
causing damage to vital components.

• If water enters the watch or the watch fogs up and does not clear up even after a long time, consult
your dealer or an authorized service center for inspection and/or repair.

• Even if your watch has a high level of water resistance, please be careful of the following.

• If your watch is immersed in sea water, rinse thoroughly with fresh water and wipe with a dry
cloth.

• Do not pour water from a tap directly onto your watch.

• Take off your watch before taking a bath.

• If seawater enters the watch, place the watch in a box or plastic bag and immediately take it in for
repair. Otherwise, pressure inside the watch will increase, and parts (crystal, crown, push button,
etc.) may come off.

Precautions

64 65

CAUTION

<Band>

• Leather bands and rubber (urethane) bands will deteriorate over time due to perspiration dirt.
Because of the natural materials, leather band will be worn, deformed, and discolored over time. It
is recommended to replace the band periodically.

• The durability of a leather band may be affected when wet (fading, peeling of adhesive), owing to
the properties of the material. Moreover, wet leather may cause a rash.

• Do not stain a leather band with substances containing volatile materials, bleach, alcohol
(including cosmetics). Discoloration and premature aging may be occurred. Ultraviolet light such
as direct sunlight may cause discoloration or deformation.

• It is recommended to take off the watch if it gets wet, even if the watch itself is water-resistant.

• Do not wear the band too tightly. Try to leave enough space between the band and your skin to
allow adequate ventilation.

• The rubber (urethane) band may be stained by dyes or soil present in or on clothing or other
accessories. Since these stains may not be removable, caution is required when wearing your watch
with items that tend to easily transfer color (articles of clothing, purses, etc.). In addition, the band
may be deteriorated by solvents or moisture in the air. Replace with a new one when it has lost
elasticity or become cracked.

When Wearing Your Watch

Precautions and usage limitations Precautions and usage limitations

CAUTION

• Please request adjustment or repair of the band in the following cases:

• You notice an abnormality with the band due to corrosion.

• The pin of the band is protruding.

• We recommend seeking the assistance of an experienced watch technician for sizing of your watch.
If adjustment is not done correctly, the bracelet may unexpectedly become detached leading to loss
of your watch or injury.
Consult an authorized service center.

<Temperature>

• The watch may stop or the function of the watch may be impaired in extremely high or low
temperature. Do not use the watch in places where the temperature is outside the operating

temperature range as stated in the specifications.

<Magnetism>

• Analog quartz watches are powered by a step motor that uses a magnet. Subjecting the watch to
strong magnetism from the outside can cause the motor to operate improperly and prevent the
watch from keeping time accurately.
Do not allow the watch to come into close proximity to magnetic health devices (magnetic
necklaces, magnetic elastic bands, etc.) or the magnets used in the latches of refrigerator doors,
clasps used in handbags, the speaker of a cell phone, electromagnetic cooking devices and so on.

When Wearing Your Watch (continued)

66 67

<Strong Shock>

• Avoid dropping the watch or subjecting it to other strong impact. It may cause malfunctions and/
or performance deterioration as well as damage to the case and bracelet.

<Static Electricity>

• The integrated circuits (IC) used in quartz watches are sensitive to static electricity. Please note the
watch may operate erratically or not at all if exposed to intense static electricity.

<Chemicals, Corrosive Gasses and Mercury>

• If paint thinner, benzene or other solvents or products containing these solvents (including
gasoline, nail-polish remover, cresol, bathroom cleaners and adhesives, water repellent, etc.) are
allowed to come into contact with the watch, they may discolor, dissolve or crack the materials. Be
careful when handling these chemicals. Contact with mercury such as that used in thermometers
may also cause discoloration of the band and case.

<Protective Stickers>

• Be sure to remove any protective stickers that may be on your watch (case back, band, clasp, etc.).
Otherwise, perspiration or moisture may enter the gaps between the protective stickers and the
parts, which may result in a skin rash and/or corrosion of the metal parts.

Precautions and usage limitations Precautions and usage limitations

CAUTION

• Rotate the crown while it is pressed in fully and press the buttons periodically so they do not
become stuck due to accumulations of foreign matter.

• The case and band of the watch come into direct contact with the skin. Corrosion of the metal or
accumulated foreign matter may result in black residue coming from the bracelet when exposed to
moisture or perspiration. Be sure to keep your watch clean at all times.

• Be sure to periodically clean the bracelet and case of your watch to remove accumulated dirt and
foreign matter. In rare circumstances, accumulated dirt, foreign matter may cause irritation with
the skin. If you notice this, discontinue wearing the watch and consult your physician.

• Be sure to periodically clean foreign matter and accumulated materials from the metal band,
synthetic rubber strap (polyurethane) and/or metal case using a soft brush and mild soap. Be
careful not to allow moisture on the case if your watch is not water resistant.

• Leather bands may become discolored by perspiration or dirt. Always keep your leather band clean
by wiping with a dry cloth.

Always Keep Your Watch Clean

68 69

Caring for Your Watch

• Wipe any dirt or moisture such as perspiration from the case and crystal with a soft cloth.

• For metallic, plastic or synthetic rubber (polyurethane) band, clean it with soap and a soft
toothbrush. Be sure to thoroughly rinse the band after cleaning to remove any soap residue.

• For a leather band, wipe off dirt using a dry cloth.

• If you will not be using your watch for an extended period of time, carefully wipe off any
perspiration, dirt or moisture and store in a proper location, avoiding locations subject to
excessively high or low temperatures and high humidity.

<When Luminous Paint is used for your watch>

The paint on the dial and hands helps you with reading the time in a dark place. The luminous
paint stores light (daylight or artificial light) and glows in a dark place.
It is free from any radioactive substance or any other material harmful to a human body or
environment.

• The light emission will appear bright at first and then diminish as time passes.

• The duration of the light (“glow”) will vary depending on the brightness, types of and distance
from a light source, exposure time, and the amount of the paint.

• The paint may not glow and/or may dissipate quickly if exposure to light was not sufficient.

Specifications

Model

Timekeeping accuracy
(without the time signal
reception)

H24*

Within ±15 seconds per month when worn at normal operation
temperatures (between +5˚C (41˚F) and +35˚C (95˚F))

Analog solar-powered watch

Type

Operating temperature
range

Display functions

Maximum run time from full
charge

Battery

−10˚C (14˚F) to +60˚C (140˚F)

• Time: Hours, minutes, seconds

• Calendar: Date

• Fully charged to fully discharged:
Approximately six months (at normal operation)
Approximately three years (with power save feature)

• Power reserve upon insufficient charge warning function:
Approximately three days

Rechargeable cell (lithium button cell), 1pc.

70 71

Additional
functions

• Solar power function

• Indicating charge of the watch remaining (The charge level is not
displayed)

• O vercharging prevention function

• Insufficient charge warning function (two-second interval movement)

• Energy saving function (power save feature)

• Receiving time signal (automatic, on demand, recovery automatic)

• Signal stations: Japan (East/West)/USA/Germany/China

* When the time difference is corrected, the signal station is switched.

• C onfirming reception status (RX)

• Indicating the result of the last reception (OK/NO)

• Summer Time (ON/OFF)

• City setting (24 cities) or correcting the time difference

• Perpetual calendar (until February 28th, 2100)

Specifications are subject to change without prior notice.

Specifications

European Union directives conformance statement

Hereby, CITIZEN WATCH CO.,LTD. declares that
this product is in compliance with the essential requirements
and other relevant provisions of directive 2014/53/EU and all
other relevant EU directives.
You can find your product’s Declaration of Conformity at
“http://www.citizenwatch-global.com/ ”.

Model No.

Cal.H24

CTZ-B8155

EC1＊

＊

4