Citizen F158 User manual

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.
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.
Be sure to visit the Citizen website at http://www.citizenwatch-global.com/ .
Here you will find a variety of information such as electronic setting guides,
answers to frequently asked questions, Eco-Drive recharging information and
more.
Engraving position example
The engraving position may
differ depending on watch
model.
1

Safety precautions — IMPORTANT
This manual contains instructions that should be strictly followed at all times
not only for optimal use, but to prevent any injuries to yourself, other persons or
property. We encourage you to read the entire booklet (especially, pages
86 -
99 ) and understand the meaning of the following symbols:
■ Safety advisories are categorized and depicted in this manual as follows:
DANGER
Highly likely to cause death or serious injury
WARNING
Can cause serious injury or death
CAUTION
Can or will cause minor or moderate injury or damage
2

■ Important instructions are categorized and depicted in this manual as follows:
(Following symbols are examples of Pictograms.)
Warning (caution) symbol followed by prohibited matters.
Warning (caution) symbol followed by instructions that should be
followed or precautions that should be observed.
3
Safety precautions — IMPORTANT

4
Precautions to be taken when diving
PROHIBITED Do not use this watch while diving when...
• Do not use your watch while diving when the watch stops or exhibits any abnormal operation.
CAUTION Diving with the watch
• Persons using the diver’s watch are strongly recommended to receive proper instruction and
training pertaining to diving and observe those rules at all times.
• Please use this watch properly only after you fully understand the operating procedures and
cautions.
Using this watch other than as indicated in this instruction manual may result in failure of the
watch to function properly.
• Check the water-resistant indications on the watch face or the case back. Never dive beyond
the indicated depth.
CAUTION Before diving
• Check items below before diving
-Check to see if the watch is sufficiently charged and the insufficient charge warning
(2-second interval movement) is not activated.
-Make sure that the watch is running correctly (check the movements of the time/calendar/
second hand)
-Check to see if the crown is properly pushed in and the screw down push button is securely
locked.

5
Precautions to be taken when diving
-Make sure that the band is firmly anchored to the watch body.
-Make sure that there are no cracks or other damage to the watch band or the glass face.
-Make sure that the register ring rotates properly.
CAUTION During diving
• Do not push any push buttons or pull out the crown in the water. Operating any of them in
water may cause trouble including deterioration of water resistance.
• Be careful not to hit the watch against hard objects such as equipment or rocks.
CAUTION After diving
• Check to see if the crown is pushed in and the screw down push button is locked before
removing the sea water, dirt, and sand attached to the watch with fresh water. Then, wipe the
fresh water.

6
Features
 Satellite Wave-GPS
Receives location and time information sent from GPS
satellites and adjusts the time and calendar on the watch
automatically.
 200 m water resistant watch for diving
This watch has 200 m water resistance and can be used for
air diving with an air tank (SCUBA diving). (You cannot use
it for saturation diving using helium gas.)
It conforms with the standard of ISO 6425: 2018.
 Diving mode
It prevents wrong operation of the watch during diving; it also halts some
functions such as satellite signal reception to keep the current time indicated.
 Eco-Drive
No periodical battery replacement is needed. This watch is fueled by light.

7
Features
 Light-Level Indicator
Indicates current power generation amount.
It can be used as a reference for choosing a good charging place.
 World time
Indicates the time around the world by choosing one of 38 time zones.
 ±5-second average monthly accuracy
Keeps high accuracy without time signal reception.
 Perpetual calendar
No need for monthly and leap-year date correction until February 28, 2100.
* “Eco-Drive” is an original technology of Citizen.

8
CONTENTS
Precautions to be taken when diving ................
4
Before using this watch...........................
12
Band adjustment........................................
13
Protective stickers.......................................
13
How to use a specially designed crown/button...........
14
Component identification.........................
16
Checking the power reserve and power generation
amount .......................................
18
Checking the reception result of the satellite signal...
24

9
CONTENTS
Setting the world time ...........................
26
Checking the current time zone setting ..................
27
Obtaining location information from satellite signals .....
34
Setting the time zone manually. . . . . . . . . . . . . . . . . . . . . . . . . .
36
Receiving time information .......................
37
Switching summer time (DST) and standard time.....
44
Using the diving mode ...........................
46
Charging your watch .............................
48
Continued on the next page

10
CONTENTS
Information on satellite signal reception ............
54
Checking and adjusting the leap second setting .........
59
Checking and adjusting the rollover number setting .....
62
Adjusting the time and calendar manually ..........
66
Using the rotating bezel ..........................
72
Troubleshooting .................................
74
Checking and correcting the reference position..........
74
Symptom and remedies.................................
78

11
CONTENTS
Eco-Drive watch handling precautions ..............
86
Water resistance.................................
90
Precautionary items and usage limitations ..........
92
Specifications ..................................
100

12
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
48
-.
• Especially, satellite signal reception is power consuming.
Take care.
After unpacking, the following must be done before using the watch:
1Checking the current power reserve (page
20
)
2Setting the world time (page
26
)
3Receiving the satellite time signal (page
37
)
Before using this watch

13
Before using this 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 (excluding
products containing the band adjustment tool).
Consult 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.
Continued on the next page

14
Before using this watch
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.
Screw down crown/button
Unlock the crown/button prior to operate your watch.
Unlock Lock
Screw down
crown
Rotate the crown
counterclockwise
until it releases
from the case.
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.
Screw down
push button
Rotate the
locking screw
counterclockwise,
and loosen until it
stops.
Rotate the locking screw
clockwise, and tighten firmly.

15
Before using this watch
Recessed button
Press the button with a non-marring narrow-tipped object.
• Metal objects may cause marring or scratching of
the button.

16
Component identification
Button
B
Button
A
Crown
Minute handHour hand
Function hand
Second hand
Date indication
Rotating bezel
Hands and buttons
ON
S S
M F
T T
W
OFF
N
O
O
K
R
X
-
T
M
E
R
X
-
G
P
S
P
A
R
R
U
H
D
X
B
D
E
L
P
D
L
R
I
O
M
A
O
N
Y
C
D
E
N
G
A
L
A
P
A
G
O
S
F
E
R
N
A
N
D
O
D
E
N
O
R
O
N
H
A
L
O
N
S
H
A
R
M
E
L
S
H
E
I
K
H
M
A
L
D
I
V
E
S
D
A
C
S
J
B
L
D
A
U
O
N
Y
D
M
C
N
A
T
E
K
U
H
P
O
Y
T
I
J
I
F
U
B
T
X
A
L
I
I
A
W
A
H
F
E
E
R
R
E
I
R
R
A
B
T
A
E
R
G
7

17
Component identification
Indication
• The illustrations in this instruction manual may differ from the actual appearance
of your watch.
• A solar cell is placed under the dial.
Place name/time zone
ON
S S
M F
T T
W
OFF
N
O
O
K
R
X
-
T
M
E
R
X
-
G
P
S
P
A
R
R
U
H
D
X
B
D
E
L
P
D
L
R
I
O
M
A
O
N
Y
C
D
E
N
G
A
L
A
P
A
G
O
S
F
E
R
N
A
N
D
O
D
E
N
O
R
O
N
H
A
L
O
N
S
H
A
R
M
E
L
S
H
E
I
K
H
M
A
L
D
I
V
E
S
D
A
C
S
J
B
L
D
A
U
O
N
Y
D
M
C
N
A
T
E
K
U
H
P
O
Y
T
I
J
I
F
U
B
T
X
A
L
I
I
A
W
A
H
F
E
E
R
R
E
I
R
R
A
B
T
A
E
R
G
7
RX-TME:
Reception-in-progress indication
(time)
RX-GPS:
Reception-in-progress indication
(location information)
OK/NO:
Reception result indication
S/M/T/W/T/F/S:
Day-of-week indication
Power reserve indication (in five levels)
ON/OFF:
Summer time (DST) setting
DIVE:
Diving mode

18
Always care about the current power reserve and charging environment of the
watch and charge it sufficiently.
ON
S S
M F
T T
W
OFF
N
O
O
K
R
X
-
T
M
E
R
X
-
G
P
S
7
4
3
2
1
0
ON
S S
M F
T T
W
OFF
01
2
3
4
65
Indication of power reserve in
levels
Indication of power generation
amount in levels
Function hand Hour, minute and second
hands
Checking the power reserve and power generation amount

19
Checking the power reserve and power generation amount
Make sure that the watch is not wet before operating it.
1Push the crown in to position
0
.
2Press and release the upper right button B.
The power reserve and power generation amount at the
moment of pressing the button are indicated in level.
• Power reserve level (function hand): page
20
• Level of power generation amount (hour, minute and
second hands): page
22
3Press and release the upper right button Bto finish
the procedure.
The hands returns to current time indication.
• They return to current time indication automatically in
about 10 seconds.

20
Checking the power reserve and power generation amount
Indication of power reserve in levels
Level 43210
Indication
See “Indication of power reserve in levels” on page 18.
Duration
24 - 19
months
19 - 14
months 14 - 5 months 5 months - 5
days
5 days or
shorter
Meaning
Power reserve
is sufficient. Power reserve is OK. Power reserve
is getting low.
Insufficient
charge
warning has
started.
OK for normal use.
Charge immediately.