Citizen G910 User manual

1
Table of contents
Thank you for your purchase of this Citizen watch.
Before using the watch, read this instruction manual carefully to ensure correct use.
Parts identification . . . . . . . . . . . . . . . 2
Notes on modes of this watch. . . . . . . 4
Checking the reference position
of the hands . . . . . . . . . . . . . . . . . . 6
Adjusting the watch. . . . . . . . . . . . . . . 8
Adjusting the date . . . . . . . . . . . . . . .13
Adjusting the year/month. . . . . . . . .14
Using the chronograph . . . . . . . . . . .16
Checking the time by sounds
(Minutes repeater). . . . . . . . . . . .18
Adjusting the reference position . . .20
Using the tachymeter . . . . . . . . . . . .22
Notes on charging your watch . . . . .24
Troubleshooting . . . . . . . . . . . . . . . . .27
Precautions . . . . . . . . . . . . . . . . . . . . .30
Maintenance . . . . . . . . . . . . . . . . . . . .38
Information. . . . . . . . . . . . . . . . . . . . .39
Specifications . . . . . . . . . . . . . . . . . . .40

2
60
400
300
250
120
130
140
150
160
180
200
220
80
85
90
95
100
110
65
70
75
T
A
C
H
Y
M
E
T
E
R
DEC
MON
TUE
WED
THU
FRI
SAT SUN
60
60
30
25
20
35
40
55
50
45
05
10
15
30
45
L.Y
1
2
3
12
6
10 2
84
15
60
24
12
618
30
20
10
40
50
JUN
AUG
APR
OCT
FEB
Parts identification
• The illustrations in this instruction manual may differ from the actual appearance of your watch.
Day indicator
Day indication
Hour hand
Passed year indication
Lower left button (C)
Month hand/Chronograph
minute hand
Chronograph second
hand
Minute hand
Upper right button (B)
24-hour hand
Crown
Second hand
Lower right button (A)
Date indication
Tachymeter
Year hand/
Chronograph hour hand

3
How to use the screw down crown and screw down push button
Some models feature a screw down crown and screw down push button.
Locking the crown and button prevents accidental operation. Unlock them when you
want to operate the watch.
Unlock Lock
Screw down
crown
Rotate the crown
counterclockwise until it
releases from the case.
After pushing the
crown in to the position
0, rotate the crown
clockwise while pushing
it in, and tighten firmly.
Screw down
push button
Rotate the locking screw
counterclockwise, and
loosen until it stops.
Rotate the locking screw
clockwise, and tighten
firmly.
• Unlocking is not required when a standard crown and button are equipped.

4
60
400
300
250
120
130
140
150
160
180
200
220
80
85
90
95
100
110
65
70
75
T
A
C
H
Y
M
E
T
E
R
DEC
MON
TUE
WED
THU
FRI
SAT SUN
60
60
30
25
20
35
40
55
50
45
05
10
15
30
45
L.Y
1
2
3
12
6
10 2
84
15
60
24
12
618
30
20
10
40
50
JUN
AUG
APR
OCT
FEB
Notes on modes of this watch
There are two modes for hand indications in this watch; one is for checking the
calendar and the other is for using the chronograph.
For checking the calendar—Normal indication mode
Day indicator and indication
(common)
Hour hand (common)
Year hand and indication
Lower left button (C)
Pressing and holding this
button for two or more
seconds will engage the
chronograph indication
mode.
Minute hand (common)
24-hour hand (common)
Second hand (common)
Date indication
(common)
Month hand

5
60
400
300
250
120
130
140
150
160
180
200
220
80
85
90
95
100
110
65
70
75
T
A
C
H
Y
M
E
T
E
R
DEC
MON
TUE
WED
THU
FRI
SAT SUN
60
60
30
25
20
35
40
55
50
45
05
10
15
30
45
L.Y
1
2
3
12
6
10 2
84
15
60
24
12
618
30
20
10
40
50
JUN
AUG
APR
OCT
FEB
For using the chronograph—Chronograph indication mode
Day indicator and indication
(common)
Hour hand (common)
Chronograph hour hand
Lower left button (C)
Pressing and holding this
button for two or more
seconds will return the
normal indication mode.
Minute hand (common)
24-hour hand (common)
Second hand (common)
Date indication
(common)
Chronograph second
hand
Chronograph minute
hand
• In this manual, all the explanations start from the normal indication mode of this watch.

6
Checking the reference position of the hands
If the reference position is incorrect, the time and calendar are not indicated properly.
See the next page to confirm the correct reference position.
1. Ensure that the crown is in position 0when
the watch is in the normal indication mode.
2. Press and hold the lower right button (A)
for two or more seconds.
The current time of sub-watch is shown. For in-
depth information on the sub-watch, see page 8.
• Sub-watch is working though the hands do not move.
3. Press the lower right button (A) again.
The current reference positions of the following
items are shown: year hand, month hand,
chronograph second hand, and date indication.
4. Press any button to finish the checking.
• The normal indication mode resumes in two minutes
when no operation is done.
A
60
180
200
2
20
A
60
180
200
2
20
012
Crown position

7
60
400
300
250
120
130
140
150
160
180
200
220
80
85
90
95
100
110
65
70
75
T
A
C
H
Y
M
E
T
E
R
DEC
MON
TUE
WED
THU
FRI
SAT SUN
60
60
30
25
20
35
40
55
50
45
05
10
15
30
45
L.Y
1
2
3
12
6
10 2
84
15
60
24
12
618
30
20
10
40
50
JUN
AUG
APR
OCT
FEB
60
400
300
2
5
0
12
0
13
0
140
150
160
180
200
22
0
80
85
90
95
100
11
0
65
70
75
T
A
T
T
C
H
Y
H
M
E
T
E
R
D
E
C
60
60
30
25
20
35
40
55
50
45
05
10
1
5
30
45
4
L.Y
1
2
3
12
6
10
2
8
4
15
J
UN
AUG
APR
OCT
FEB
60
24
12
6
18
30
20
10
40
50
M
O
N
TUE
WED
TH
U
FRI
S
A
T
S
U
N
1
Notes on the correct reference position
The correct reference position for all the items is shown below. If items are not in the
correct reference position, refer to page 20 for the adjustment.
Year hand
(indicating 12:00)
Date indication
(indicating 1)
Month hand
(indicating 12:00)
Chronograph second
position
(indicating 12:00)

8
Adjusting the watch
This watch consists of two built-in clocks—the main-watch and the sub-watch.
Each controls the functions of the hands in a different manner.
For details on the assignment of the
functions to the main-watch and
the sub-watch, refer to the table to
the right.
The main-watch and sub watch are
adjusted separately.
If the sub-watch is not synchronized
to the main-watch, the tones of
the minutes repeater will not
synchronize with the time on the
main-watch (large hour and minute
hands).
Hands and indications Main-watch Sub-watch
Year/Minute/Second hands √
Day indication √
24-hour hand √
Year hand and indication √
Month hand √
Date indication √
Minutes repeater √
• This watch shows the year indication as the number of years passed since leap year. It is not the actual
year.

9
For the most accurate setting, first adjust the sub-watch and then synchronize the
main-watch with the time on the sub-watch.
1. Pull the crown out to position 2when the
second hand indicates 12:00.
Both the main-watch and the sub-watch stop,
and the current time of the sub-watch is shown.
012
Crown position
Continued to the next page
0
120
130
140
150
160
180
200
220
8
0
85
90
95
100
110
DEC
60
30
25
20
35
40
4
5
1
5
30
45
L.Y
1
2
3
12
6
10 2
84
15
12
618
30
2040
JUN
AUG
APR
OCT
FEB
0
120
13
0
140
150
160
180
200
22
0
80
85
90
95
100
11
0
DEC
60
30
25
20
35
40
45
15
30
45
4
L.Y
1
2
3
12
6
10
2
8
4
1
5
12
6
18
30
20
40
J
UN
AUG
APR
OCT
FEB
e.g. When it is 10:09.
Minute hand of the
sub-watch
Hour hand of the
sub-watch

10
2. Adjust the hour and minute hands by
pressing the lower or upper right button (A
or B).
• Each time you press the lower or upper right button
(Aor B), the minute hand moves counterclockwise or
clockwise. The movement of the hour hand is linked
with the minute hand.
• If you press and hold the button, the minute and hour
hands move continuously.
• The chronograph second hand indicates the a.m. or
p.m. reference. When the hand points to 12, a.m. time
is indicated. When the hand points to 1, p.m. time is
indicated.
• While adjusting, year/month/date are not changed.
A
60
180
200
2
20
B
400
300
10
012
Crown position
60
65
T
A
C
H
Y
M
E
T
E
R
WED
THU
FRI
SAT SUN
60
55
0
05
1
60
65
T
A
T
T
C
H
Y
H
M
E
T
E
R
WED
T
H
U
FRI
S
AT SU
N
60
55
0
05
1
60
65
T
A
C
H
Y
M
E
T
E
R
WED
THU
FRI
SAT SUN
60
55
0
05
1
60
65
T
A
T
T
C
H
Y
H
M
E
T
E
R
WED
T
HU
FRI
S
AT SU
N
60
55
0
05
1
In the morning
(a.m.) In the afternoon
(p.m.)

11
3. Adjust the time and the day of the main-
watch by rotating the crown.
• The movement of the hour hand/24-hour hand/day
indicator is linked with the minute hand.
• You may rapidly advance the day by repeatedly rotating
the crown to move the hour and minute hands between
10:00 p.m. and 1:00 a.m.
60
400
300
250
00
220
80
8
5
65
70
75
T
A
C
H
Y
M
E
T
E
R
DEC
MON
TUE
WED
THU
FRI
SAT SUN
60
55
50
45
05
10
15
L.Y
1
2
3
12
6
10 2
84
60
24
12
618
30
20
10
40
50
60
400
300
2
5
0
00
22
0
80
85
65
70
75
T
A
T
T
C
H
Y
H
M
E
T
E
R
DEC
60
55
50
45
05
10
15
L.Y
M
O
N
T
U
E
WED
THU
FRI
S
A
T
S
U
N
1
2
3
12
6
10
2
8
4
60
24
12
6
18
30
20
10
40
50
Hour hand
Continued to the next page
Second hand
24-hour hand
Minute hand
Day indicator
Crown
012
Crown position

12
4. Push the crown in to position 0to start the
watch.
Both the main-watch and the sub-watch start
simultaneously, and the second hand starts to
move.
• The second of the sub-watch starts from 0-seconds
when the crown is pushed in to position 0.
012
Crown position

13
Adjusting the date
1. Pull the crown out to position 1.
The watch does not stop.
2. Adjust the date by pressing the lower or
upper right button (Aor B).
• Each time you press the lower or upper right button (A
or B), the date goes backward or forward day by day.
• The date will change continuously by pressing and
holding either button. To stop the movement, press the
lower or upper right button (Aor B).
3. Push the crown in to position 0.
012
012
B
400
300
10
A
60
180
200
2
20
Crown position
Crown position
• If the date changes at noon, adjust the time of the sub-watch referring to page 8.

14
Adjusting the year/month
1. Pull the crown out to position 1.
The watch does not stop.
2. Adjust the year and month by pressing the
lower left button (C).
• If you press and hold the button, the year and month
change continuously.
• The movement of the year hand is linked with the
month hand.
• See the next page about the year/month indications.
3. Push the crown in to position 0.
012
012
00
DEC
60
35
30
45
.Y
1
2
3
12
6
10 2
84
15
JUN
AUG
A
OCT
F
C
85
90
9
40
Crown position
Crown position

15
About the month hand
June is indicated on the illustration
above.
About the year hand
The year hand indicates the year as the
number of years passed since leap year.
The first year passed since from leap
year is shown on the illustration above.
L.Y
1
2
3
12
10 2
12
10
2
DEC
60
30
45 15
JUN
AUG
APR
OCT
FEB
60
3
0
45
4
1
5
Jan.
Feb.
Mar.
Apr.
MayJun.
Dec.
Nov.
Oct.
Sep.
Aug.
Jul.
Indication Passed year Year
L.Y Leap year 2012, 2016
1 1st year 2009, 2013
2 2nd year 2010, 2014
3 3rd year 2011, 2015

16
Using the chronograph
You can record up to 12 hours in increments of 0.25 seconds.
1. Ensure that the crown is in position 0.
2. Press and hold the lower left button (C)
for two or more seconds to change to the
chronograph indication mode.
The chronograph second hand turns around.
3. Press the upper right button (B) to start
timing.
The chronograph second hand starts timing.
• The chronograph second hand stops after timing 12
hours.
4. Press the upper right button (B) to stop
timing.
The recorded time is shown.
• Pressing the upper right button (B) restarts timing
from the recorded time.
C
85
90
B
400
300
10
012
A
60
180
200
2
20
Crown position

17
To record lap times
The lap time is shown by pressing the lower right button (A) while timing.
The timing goes on though the hands are paused.
The indication for the current timing is shown by pressing the button again.
To record the best time and the second best time
The best time is shown by pressing the lower right button (A) while timing.
The second best time is shown by pressing the upper right button (B) after pressing
the lower right button (A).
To reset the chronograph to zero
After stopping the chronograph timing by pressing the upper right button (B), press
the lower right button (A).
The chronograph second hand moves to 12:00 when the chronograph is reset.
To change to the normal indication mode, press and hold the lower left button (C) for
two or more seconds.

18
Checking the time by sounds (Minutes repeater)
The chime tells the current time by the tones and the number of times.
• Minutes repeater operates from the sub-watch time. It does not distinguish from
morning (a.m.) or afternoon (p.m.) time.
• You cannot use the minutes repeater when using the chronograph.
1. Ensure that the crown is in position 0.
2. Press the upper right button (B) for two or
more seconds.
The minutes repeater sounds the chime for the
current time.
B
400
300
10
012
Crown position
Tones Meanings
High Hour
Low Minute
Combinations of high tone and
low tone
15 minutes

19
About the sounds of the minutes repeater
The minutes repeater, for example, tells 8:36 in the following way:
To stop the sound
Press any button.
♩
1
♩
2
♩
3
♩
4
♩
5
♩
♩♩♩♩♩♩
6 123456
♩
7
♩
8
♩
♩
1
♩
♩
2
+
6 minutes
High tone Combinations of high tone
and low tone Low tone
8 hours
15 minutes x 2
36 minutes

20
Adjusting the reference position
• See page 11 to check the correct position for each item.
1. Pull the crown out to position 2.
All the hands and indications stop.
2. Press and hold the lower left button (C) for
five or more seconds.
The hands start to move rapidly to show the
current reference position.
• Each time you press the lower left button (C), the item
selection changes in the following order:
Year/Month hands → Chronograph second hand →
Date → To the beginning
• The selected item moves a little to indicate the
selection item is active for adjustment.
012
C
85
90
Crown position