Seiko | Cal. V137 | User guide | Seiko Cal. V137 User guide

READ FIRST
CONTENTS
Complete User Guide
7X52 GPS SOLAR WATCH
CONTENTS
ASTRON 7X52 GPS SOLAR
Thank you very much for choosing a SEIKO watch.
For proper and safe use of your SEIKO watch,
please read carefully the instructions in this
Complete User Guide before using it.
Keep this Complete User Guide handy for easy reference.
Length adjustment service for metallic bands is available at the retailer from whom the watch
was purchased. If you cannot have your watch repaired by the retailer from whom the watch was
purchased because you received the watch as a gift, or you moved to a distant place, please contact
SEIKO WORLDWIDE SERVICE NETWORK. The service may also be available on a chargeable basis at
other retailers, however, some retailers may not undertake the service.
If your watch has a protective film for preventing scratches, make sure to peel it off before using the
watch. If the watch is used with the film on it, dirt, sweat, dust, or moisture may be attached under
the film and may cause rust.
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READ FIRST
ASTRON 7X52 GPS SOLAR
CONTENTS
1
HANDLING CAUTIONS
CAUTIONS
WARNING
To indicate the risks of serious consequences such as severe injuries
unless the following safety regulations are strictly observed.
To indicate the risks of light injuries or material damages unless the
following safety regulations are strictly observed.
• Immediately stop wearing the watch in the following cases.
• Avoid wearing or storing the watch in the following places.
If the watch body or band becomes edged by corrosion etc.

• Keep the watch and accessories out of the reach of babies and children.
Places where volatile agents

(cosmetics such as polish remover,
bug repellent, thinners etc.) are
vaporizing
Places where the temperature

drops below 5 ºC or rises above 35
ºC for a long time
Care should be taken to prevent a baby or a child accidentally swallowing
the accessories.
• If you observe any allergic symptoms or skin irritation
If a baby or child swallows the battery or accessories, immediately consult a
doctor, as it will be harmful to the health of the baby or child.
Stop wearing the watch immediately and consult a specialist such as a
dermatologist or an allergist.
If the pins protrude from the band.

Immediately consult the retailer from whom the watch was purchased or

SEIKO WORLDWIDE SERVICE NETWORK.
Places of high humidity

Places affected by strong

magnetism or static electricity
Dusty places

Places affected by strong vibrations

• Other cautions
• Do not remove the secondary battery from the watch.
Replacement of the metal band requires professional knowledge and

skill. Please ask the retailer from whom the watch was purchased for
replacement of the metal band, as there is a risk of hand or finger injury
and fear of losing parts.
About the secondary battery  Power Source P. 40

Replacement of the secondary battery requires professional knowledge
and skill. Please ask the retailer from whom the watch was purchased for
replacement of the secondary battery.
Do not disassemble or tamper with the watch.

Installation of an ordinary silver oxide battery can generate heat that can
cause bursting and ignition.
Keep the watch out of the reach of babies and children. Extra care should

be taken to avoid risks of any injury or allergic rash or itching that may be
caused when they touch the watch.
When disposing of used batteries, follow the instructions of your local authorities.

If your watch is of the fob or pendant type, the strap or chain attached to the

watch may damage your clothes, or injure the hand, neck, or other parts of
your body.
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ASTRON 7X52 GPS SOLAR
CONTENTS
1
CAUTIONS
WARNING
Do not use the watch in scuba diving or
saturation diving.
Do not turn or pull out the crown when the
watch is wet.
The various tightened inspections under simulated harsh
environment, which are usually required for watches
designed for scuba diving or saturation diving, have not
been conducted on the water-resistant watch with the
BAR (barometric pressure) display. For diving, use special
watches for diving.
Water may get inside of the watch.

If the inner surface of the glass is clouded with condensation or
water droplets appear inside of the watch for a long time, the water
resistant performance of the watch is deteriorated. Immediately
consult the retailer from whom the watch was purchased or SEIKO
WORLDWIDE SERVICE NETWORK.
Do not leave moisture, sweat and dirt on the
watch for a long time.
CAUTIONS
Be aware of a risk that a water resistant watch may lessen
its water resistant performance because of deterioration
of the adhesive on the glass or gasket, or the development
of rust on stainless steel.
Do not pour running water directly from faucet.
The water pressure of tap water from a faucet is high
enough to degrade the water resistant performance of a
water resistant watch for everyday life.
Do not wear the watch while taking a bath or a
sauna.
Steam, soap or some components of a hot spring
may accelerate the deterioration of water resistant
performance of the watch.
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ASTRON 7X52 GPS SOLAR
CONTENTS
1
Features
This is a GPS* solar watch.
 GPS is an abbreviation for Global Positioning System.
 For details, see P. 27
This watch has the following features.
This watch can be set to the precise local time
by just one button operation anywhere in the
world.
This watch quickly adjusts the time by receiving GPS
signals from GPS satellites.
 Place where GPS signals can be easily received/
cannot be received P. 13
This watch responds to a total of 39 time zones around
the world
 Time Zone P. 28
This watch operates by solar charging.
Expose the dial to light to charge the watch.
Once fully charged, the watch runs for approximately
6 months.
When the energy stored in the watch runs out
completely, it takes time to fully charge the watch, so
please keep in mind to charge the watch regularly.
 How to charge the watch P. 11
 Standard charging time P. 11
When the region or time zone where the watch is used
is changed, please carry out operation of “time zone
adjustment.”
 How to adjust the time zone P. 14 ~ 16
This watch automatically adjusts the time in
accordance with action patterns during use.
When the watch has sensed sufficient brightness
under an open sky, it automatically receives GPS
signals from GPS satellites. This function enables the
watch to automatically adjust the time precisely even
while you are using the watch.
 Automatic time adjustment P. 23

This watch is unable to receive GPS signals when the energy
stored in the watch is low.
 Check the Charging Status P. 10
7th
6th

Unlike navigation equipment, this GPS solar watch is not designed to constantly receive GPS signals from GPS satellites without any operation.
This watch receives GPS signals only in the time zone adjustment mode, automatic or manual time adjustment mode.
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ASTRON 7X52 GPS SOLAR
The following functions are included
When the region or time zone where the watch is used is
changed
To set only the time
The watch displays the precise time of the time zone that is set by
operation of “manual time adjustment.”
Adjust the time zone.
The watch displays the precise local time.
 How to manually adjust the time P. 21 ~ 22
 Check the time zone setting P. 16
 Time zone adjustment P. 14 ~ 16
 Time Zone P. 28
 Time zone display and list of time zones around the world P. 9
Los Angeles 7:00 pm on 6th
London
1:00 pm on 7th
5
CONTENTS
1
CONTENTS
ASTRON 7X52 GPS SOLAR
CONTENTS
2
CONTENTS
1. READ FIRST… ……………………………………………………………………
2
2. CONTENTS…………………………………………………………………………
6
5. DETAILED INFORMATION………………………………………………………
Mechanism by which the GPS watch sets time and date………………
Time zone… ……………………………………………………………………
GPS signal reception… ………………………………………………………
Leap second (Automatic leap second reception function)… …………
3. BEFORE USE……………………………………………………………………… 7
Names of the parts… ………………………………………………………… 7
Indicator hand display and reception result display… ………………… 8
Time zone display and list of time zones around the world… ……… 9
Check the charging status… ………………………………………………… 10
About charging………………………………………………………………… 11
4. BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS
SIGNALS, ETC.)……………………………………………………………………
Basic operation flow………………………………………………………………
Place where GPS signals can be easily received/cannot be
received……………………………………………………………………………
Time Zone Adjustment (When the region or time zone where the
watch is used is changed )……………………………………………………
Check the time zone setting… ………………………………………………
Set Daylight Saving Time (DST)… …………………………………………
In-flight mode ( ) (When boarding)…………………………………………
Manual time zone setting (To set the watch to the local time of the
destination in an airplane, etc. )… …………………………………………
manual time adjustment (To set only the time)… ………………………
Automatic time adjustment… ………………………………………………
Reception result display (Check that reception was
successful)…………………………………………………………………………
Dual time display… ……………………………………………………………
How to set the sub-dial… ……………………………………………………
27
27
28
29
30
6. IN CASE OF AN UNUSUAL MOVEMENT OF THE SECOND HAND………… 31
Energy depletion forewarning function (second hand movement
and watch state )… …………………………………………………………… 31
12
12
13
14
16
18
19
20
21
23
24
25
26
7. TO PRESERVE THE QUALITY OF YOUR WATCH……………………………
Daily care… ……………………………………………………………………
Performance and caliber / case number……………………………………
Screw-lock type crown… ……………………………………………………
Water resistance… ……………………………………………………………
Magnetic resistance (Magnetic influence)…………………………………
Band………………………………………………………………………………
How to use an adjustable three-fold clasp… ……………………………
Lumibrite…………………………………………………………………………
Power source……………………………………………………………………
After-sale service………………………………………………………………
33
33
33
34
35
36
37
38
39
40
41
8. TROUBLESHOOTING… …………………………………………………………
When the watch is unable to receive GPS signals… ……………………
When the time/date or indicator hand position is misaligned…………
In case of an abnormal movement (resetting the built-in IC )… ………
Troubleshooting… ……………………………………………………………
42
42
45
48
51
9. FUNCTION LIST/SPECIFICATIONS… ………………………………………… 56
6
BEFORE USE
ASTRON 7X52 GPS SOLAR
CONTENTS
3
Names of the parts
Main-Dial
Hour hand Minute hand Second hand
Date
Button B
Button A
Crown (Screw lock type)
Indicator hand
 P. 34
 P. 8

Keep the crown locked while you are
wearing the watch.
Sub-dial
 P. 25 ~ 26
Button C
7
Continued on the
following page
BEFORE USE
ASTRON 7X52 GPS SOLAR
CONTENTS
3
Indicator hand display and reception result display
Display of charging status
Hand
position
F (full)
Level position
(middle)
Display of receiving process
Receiving
process
E (low)
1 (time
adjustment)
4+ (time zone
adjustment)
Receiving leap
second data
Display
Display
Check the reception result  P. 24
Automatic time adjustment  P. 23
Manual time adjustment  P. 21 ~ 22
Check the charging status.  P. 10
How to charge the watch  P. 11
Receive leap second data  P. 30
Time zone adjustment  P. 14 ~ 16
Display of in-flight mode ( )
Hand
position
In-flight mode
( ) status
Display
Display of
reception result
Reset in-flight mode
 It is displayed only
while the in-flight
mode is set.
Y … Reception successful
(12-second position)
Display of Daylight Saving
Time (DST)
Hand
position
ON
N … Reception failed
(18-second position)
[Checking the reception
result]  P. 24
OFF
In-flight mode ( )  P. 19
Display
Check Daylight Saving Time (DST)  P. 17
Set Daylight Saving Time (DST)  P. 18
8
 Position of each display may differ depending
on the model (design).
Continued on the
following page
BEFORE USE
ASTRON 7X52 GPS SOLAR
CONTENTS
3
Time zone display and list of time zones around the world
The following lists show the relationship between displays of the bezel and dial ring and time difference from the UTC.
Please refer to the second hand positions below to set the time zone or to check the time zone setting.
The time zone of each region is as of January 2012.
Daylight Saving Time (DST) is in effect in time zones with a  mark.
In the Lord Howe Island time zone in Australia with a  mark, the time is advanced by 30 minutes while Daylight Saving Time (Summer Time) is in effect.
This watch corresponds to DST in the Lord Howe Island time zone.
Display of time zone
Representative city names…26
cities among the total of 39 time
zones around the world
Time difference…+14 hours ~ –12
hours
[Check the time zone]  P. 16
[Time Zone Adjustment]  P. 14 ~ 15
City
code
Position of
the second
hand
0
UTC/LON second
City name
London
City
code
Position of
the second
hand
0
BJS
17
second
Beijing
UTC
± hours
City name
City
code
Position of
the second
hand
+8
HNL
37
second
Honolulu
+9
—
39
second
Marquesas Islands
+9.5
ANC
41
second
Anchorage
–9
+10
LAX
43
second
Los Angeles
–8
+10.5
DEN
45
second
Denver
–7
+11
CHI
47
second
Chicago
–6
NYC
49
second
New York
–5
—
50
second
Caracas
SCL
51
second
Santiago
UTC
± hours
City name
UTC
± hours
–10
PAR
2
second
Paris/Berlin
+1
TYO
19
second
Tokyo
CAI
4
second
Cairo
+2
—
20
second
Adelaide
JED
6
second
Jeddah
+3
SYD
21
second
Sydney
—
7
second
Tehran
—
22
second
 Lord Howe Island
DXB
8
second
Dubai
+4
NOU
23
second
Nouméa
—
9
second
Kabul
+4.5
—
24
second
Norfolk Island
+11.5
KHI
10
second
Karachi
WLG
25
second
Wellington
+12
DEL
11
second
Delhi
+5.5
—
27
second
Chatham Islands +12.75
—
12
second
Kathmandu
+5.75
TBU
28
second
Nuku'alofa
+13
—
52
second
St. John's
DAC
13
second
Dhaka
+6
—
30
second
Kiritimati
+14
RIO
53
second
Rio de Janeiro
–3
—
14
second
Yangon
+6.5
—
33
second
Baker Island
–12
Bangkok
MDY
35
second
Midway islands
–11
55
second
Fernando de
Noronha
–2
BKK
15
second
FEN
PDL
57
second
Azores
–1
+3.5
+5
+7
9
–9.5
–4.5
–4
–3.5
BEFORE USE
ASTRON 7X52 GPS SOLAR
CONTENTS
3
Check the charging status
The indicator hand position shows whether this watch is able or unable to receive GPS signals.
In addition, for the low charging state, the movement of the second hand shows the energy depletion state in further detail.
 GPS signal reception requires a lot of energy. Keep in mind to regularly charge the watch by expose to light.  About charging P. 11
Reception is
allowed
Indicator display
Charging status
F (full)
Solution
Reception is Indicator display Movement of second hand
not allowed
1-second
interval
movement
Reception is
allowed.
 Proceed to P. 12
2-second
interval
movement
5-second
interval
movement
Reception is
allowed, but keep
Level position in mind to charge
(middle)
the watch.
About charging 
P. 11
—
10
Charging status
The watch
is unable to
receive GPS
signals, but
has energy to
operate.
Solution
Charge the watch at least until
the indicator hand points to the
level position so that the watch
is able to receive GPS signals.
About charging  P. 11
E The watch is
unable to receive Continue to charge the watch
(low) GPS signals,
at least until the indicator hand
and does not
have energy to
operate. (The
energy depletion
forewarning
function is
activated. P. 31)
points to the level position
so that the watch is able to
continuously operate and
receive GPS signals.
About charging  P. 11
Reset the in-flight mode ( ) as
long as possible.
The charging status is  Reset the in-flight mode
not displayed for the ( ) P. 19
When the indicator hand
in-flight mode ( ).
points to “E,” charge the watch
following the above.
BEFORE USE
ASTRON 7X52 GPS SOLAR
CONTENTS
3
About charging
How to charge the watch
Standard Charging Time
Expose the dial to light to charge the watch.
For an approximate time required to charge the watch, refer to the
table below.
GPS signal reception consumes a lot of energy. Keep in mind to charge
the watch by expose to light so that the indicator hand points to the “level
position (middle)” or “F (full).” (If the charging status is displayed as
“E (low),” the reception will not start even with operation of GPS signal
reception.)
 Check the charging status. P.10
To ensure optimal performance
of the watch, make sure that
the watch is kept sufficiently
charged at all time.
Illumination
lx (LUX)
Under the following situations, the energy of
the watch is likely to be depleted, resulting in
stoppage of the watch.
• The watch is concealed under a sleeve.
700
• The watch is used or stored under conditions
where it cannot be exposed to light for a long
time.
 When charging the watch, make sure that the watch is not heated to a high
temperature. (The operational temperature range is between –10 °C and +60 °C.)
 When first using the watch or starting to use the watch after it has stopped
because of the energy depletion, sufficiently charge the watch referring to the
table on the page at the right.
Light
source
Condition
(Example)
Fluorescent light General offices
3,000
Fluorescent light
10,000
Fluorescent light
Sunlight
100,000
Sunlight
30W 20cm
Cloudy day
30W 5 cm
Sunny day
(Under the direct sunlight
on a summer day)
From the state where the watch is
stopped (not charged)
To fully charged
—
In the state where
the hand moves
(the watch is
charged)
To one-second interval
To move for one day
movement is secured
—
6.5 hours
530 hours
32 hours
1.4 hours
135 hours
5 hours
22 minutes
65 hours
1.5 hours
6 minutes
The figures of “Time required for charging the watch to start moving at onesecond intervals” are estimations of time required to charge the stopped watch by
exposing it to light until it moves at steady one-second intervals. Even if the watch
is partially charged for a shorter period, the watch will resume one-second- interval
movement. However, it may shortly return to two-second-interval movement. Use
the charging time in this column as a rough guide for sufficient charging time.
 The required charging time slightly varies depending on the design and the dial color of
the watch.
11
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
Basic operation flow
1. Check the place where GPS
signals can be easily received
2.Set the time zone and set the time and date
 Place where GPS signals can be
easily received/Place where GPS
signals cannot be received P. 13
< Setting by GPS signal reception >
Place where GPS signals can be
easily received
• When the
region or time
zone where the
watch is used
is changed
Outdoors under an open sky with
good visibility
• To set only the
time
Place where GPS signals cannot
be received
• Receive GPS signals,
set the time zone and
set the time and date
 How to adjust the time
zone P. 14 ~ 16
• Set Daylight Saving
Time (DST) as
necessary
 Set Daylight Saving
Time (DST) P. 17 ~ 18
Set only the time
 How to manually
adjust the time
P. 21 ~ 22
< Manual setting >
Time zone setting is
not correct
 How to manually set the
time zone P. 20
Time zone setting is
correct
 How to manually set the
time and date P. 42 ~ 44
 Check the time zone
setting P. 16
Example: Within a subway station
12
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
Place where GPS signals can be easily received/Place where GPS signals cannot be received
There are places where GPS signals can be easily received and places where GPS signals cannot be received.
Easy to receive
•Outdoors under an open sky with good
visibility
Difficult to receive
• The smaller the sky, the more difficult it is to
receive GPS signals. In addition, it will also
be difficult to receive GPS signals, if there
is something that obstructs the GPS signals
during reception (in particular, during time
zone adjustment).
Examples:
• Between tall buildings
• Near wooded area
• Station/Airport
• Indoors with windows

GPS signals cannot be received
depending on window glass type.
Refer to the “× Cannot receive.”
13
Cannot receive
•The sky cannot be seen or only part of the sky
can be seen.
•There is something hindering the reception.
Examples:
•Indoors without windows
•Underground
•During passage of a tunnel
•Through special glass with thermal
emission shield effect, etc.
•Close to equipment generating noise or
performing wireless communications
CONTENTS
4
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
When the region or time zone where the watch is used is changed (Time Zone Adjustment)
Time zone adjustment
The time zone where you are is localized to adjust the watch to
the precise current time by receiving GPS signals.
The watch can be arbitrarily set to the local time by just one
button operation at any time.
 How to adjust the time zone P. 15
Failure or success of reception depends on the reception environment.
 Place where GPS signals can be easily received/Place where GPS signals
cannot be received P. 13
Even when the reception is successful, Daylight Saving Time (DST) cannot be
automatically set. Set DST manually.
 Set Daylight Saving Time (DST) P. 17 ~ 18
GPS signal reception consumes a lot of energy.
Keep in mind to regularly charge the watch by expose to light so that the
indicator hand points to the “level position (middle)” or “F (full).”
 How to charge the watch P. 11
If the charging status is displayed as “E (low),” the reception will not start
even with operation of GPS signal reception.
 Check the charging status. P. 10
14
Precautions on time zone adjustment
If the time zone is adjusted near a time zone boundary, the time
of the adjacent time zone may be displayed.
In some areas the boundaries observed by the watch may not
exactly correlate to the actual time zone markers on the land.
This does not indicate a malfunction.
In this case, set the time zone in the manual time zone setting
mode.
 How to manually set the time zone P. 20
When the time zone is adjusted while traveling on land, avoid
time zone boundaries to carry out time zone adjustment in the
representative cities in the time zone whenever possible.
In addition, when the watch is used near time zone boundaries,
make sure to check the time zone setting, and manually set the
time zone as necessary.
Continued on the
following page
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
How to adjust the time zone
1
Go to a place where
GPS signals can be
easily received
Move to the outdoors under
an open sky with good
visibility.
2
Continue to press Button B (6 seconds),
and then release it when the second
hand moves to the 30-second position.
Although the second hand moves to the
0-second position 3 seconds after pressing
Button B, continue to press it.
3
Direct the watch face upward and wait
Please note that it may be difficult to receive GPS
signals while you are in motion.
It takes a maximum of
2 minutes to complete
reception.
When the second hand has reached the
30-second position, reception is started.
The indicator hand points to “4+.”
Press for
6 seconds.
It depends on the receiving
conditions.
< Display during reception (= satellites acquisition
status) >
The second hand indicates ease of receiving
(= number of GPS satellites from which GPS
signals are received).
 Place where GPS signals
can be easily received/Place
where GPS signals cannot
be received P. 13
Check whether the watch is able/unable to
receive GPS signals
 Check the charging status P. 10
When the hand points to , reset the in-flight
mode ( ).
 How to reset in-flight mode ( ) P. 19
4 units
eiv
e
5 units
・・
・ 6 units
ec
r
When the hand points to “E,” charge the watch
by expose to light.
 How to charge the watch P. 11
3 units
May receive
to
Second hand
position
25-second
Number of
satellites
5 units
Even when the hand
points to 4 units or more,
reception may not be
allowed.
To cancel the reception,
press Button A.
15
e
eiv
JJ
&
% 3 -<
-
E as y
While the indicator hand points to “E” or ,
reception is not started even with operation for
reception.
0 units
・
Cannot ・・
rec
2 units
The larger the number
of acquired satellites
there are, the easier
it is to receive GPS
signals.
Press
Button A.
4
When the second hand points
to “Y” or “N,” reception is
completed.
The reception result is displayed for 5
seconds.
Then, the hour and minute hands move,
and the time and date are adjusted.
(The time zone is also adjusted to the
local time zone.)
Reception
result Y: Successful
display
Display
State
C
BP JY
J
Use the
watch as it is.
N: Failed
C
BP JY
J
 When the reception
result is displayed as
“N” P. 42
Check that the reception is successful
after the watch returns to the time
display mode.
Check that the reception was
successful P. 24
Check the time zone setting P. 16
During movement of the date, the buttons
and crown cannot be operated.
Manually set Daylight Saving Time (DST).
Set Daylight Saving Time (DST)
P. 17 ~ 18
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
Check the time zone setting.
The currently set time zone is displayed for 5 seconds.
Button C once and
1 Press
then release it
the time zone setting (within 5
2 Check
seconds)
The second hand indicates the currently
set time zone.
[Example] Time zone setting: +2 hours CAIRO
The indicator hand
indicates the ON/OFF
setting of Daylight
Saving Time (DST).
Press
once and
release it
By continuing to press Button
C, the watch enters operation of
the manual time zone setting.
After 5 seconds
have elapsed or
when Button A is
pressed, the watch
returns to the time
display mode.
To change the time zone setting
• When you are in a place where GPS signals
can be easily received (P. 13)
How to adjust the time zone P. 14 ~ 15
• When you are in a place where GPS signals
cannot be received
How to manually set the time zone P. 20
16
Press
Button A.
For the relationship between the second hand
position and time zone
Refer to the “Time zone display and list of time
zones around the world P. 9.”
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
Check Daylight Saving Time (DST) setting
Daylight Saving Time (DST)
Daylight Saving Time (DST) setting is displayed for 5 seconds.
1 then release it
Press Button A once and
2 (within 5 seconds)
Check Daylight Saving Time (DST) setting
The indicator hand indicates Daylight
Saving Time (DST) setting.
Press
once and
release it
Depending on the area, Daylight Saving Time (DST) is individually
set.
Daylight Saving Time means summer time, which is a system to
lengthen daylight time by advancing 1 hour when daylight time is
long in summer. Daylight saving time has been adopted in about 80
countries, mainly in Europe and North America. The adoption and
duration of daylight saving time vary depending on the country.
 Daylight Saving Time is subject to change owing to circumstances of the country or
region.
[Example]
Daylight Saving
Time setting: ON
 Set Daylight Saving Time (DST) P. 18
 After 5 seconds have
Press
elapsed or when
Button A.
Button A is pressed,
the watch returns to
the time display mode.
17
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
Set Daylight Saving Time (DST)
 Daylight Saving Time (DST) is not automatically changed.
 ON/OFF of the DST is not automatically changed over even with operation of time
zone adjustment/manual time zone setting.
When traveling to a region where Daylight Saving Time (DST) is not adopted from
a region where it is adopted, turn off the DST setting.
Turn ON Daylight Saving Time (DST)
Daylight Saving Time (DST) can be manually set.
Start operation of 2 within approximately 5 seconds after operation of 1.
 When the state of 1 continues for approximately 5 seconds or longer, the watch automatically returns to the time display mode. When the watch has returned to the time display mode, restart operation from 1.
When the hour and minute hands stop
1 Press Button A
to press Button C (3 seconds) within 5 seconds
2 Continue
after operation of 1
the DST setting mode is automatically
3 moving,
completed after approximately 5 seconds.
The indicator hand moves to indicate
the current Daylight Saving Time
(DST) setting.
The indicator hand moves to point to “ON,” and the hour and
minute hands advance by one hour.
The watch returns to the time display mode.
< When Daylight Saving Time (DST) setting
is OFF >
The indicator hand returns to display the charging
status.
 The time at which the
watch returns to the time
display mode varies
depending on the position
of the indicator hand.
Press
Button A
Press for
3 seconds
Turn OFF Daylight Saving Time (DST)
Carry out operation of 1 to 3 in the state where Daylight Saving Time (DST) setting is ON.
In operation of 2, adjust the indicator hand to the “OFF” position as shown in the figure at the right.
The hour and minute hands return by one hour.
18
Press
 The watch returns to
Button A.
the time display mode
even by pressing button
A within five seconds
after the hour and minute
hands stop moving.
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
When boarding (in-flight mode ( ))
In-flight mode ( )
Set to the in-flight mode ( ).
Set to the in-flight mode ( )
Start operation of 2 within 5 seconds after operation of 1.
where the reception may influence
 When 5 seconds or longer have elapsed after operation of 1, the watch automatically returns to the
time display mode. When the watch returned to the time display mode, restart operation from 1.
operation of other electronics devices
in an airplane, etc.
Continue to press Button C (3 seconds)
Press Button B and then release
within approximately 5 seconds after
In the in-flight mode ( ), the
it.
operation of 1.
GPS signal reception (time zone
The second hand indicates the
The second hand stops at the 40-second
adjustment, manual time adjustment,
reception
result
(Y
or
N),
and
the
position, and the indicator hand points to .
and automatic time adjustment) does
indicator hand points to the type
not work.
of reception (1 or 4+).
< In-flight mode ( ) state >
1
< In-flight mode ( ) >
The indicator hand points to
2
The indicator hand points to
.
.
Press
once and
release it.
Press for
3 seconds.
 When the in-flight mode ( ) is reset, the
indicator hand indicates the charging status.
In-flight mode ( ) setting
3 automatically
ends after 5 seconds
The watch returns to the time display
mode.
When the in-flight mode ( ) is
brought about, the indicator
hand points to even after
the watch has returned to the
time display mode.
 To set the watch to the local time of the
destination in an airplane, etc. (Manual
time zone setting) P. 20
Reset the in-flight mode ( ).
Carry out operation of 1 to 3.
In 2, when the indicator hand points to “● ON” in the figure at
the right, the in-flight mode ( ) can be reset.
ボタンC
3秒押し
19
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
To set the watch to the local time of the destination in an airplane, etc. (Manual time zone setting)
Manual time zone setting
In places where the time zone cannot be adjusted, the time zone can be set manually.
 Place where GPS signals can be easily received/Place where GPS signals cannot be received P. 13
Set the time zone with reference to the “Time zone display and list of time zones around the
world P. 9,” to set the watch to the local time and date.
Refer to “Set Daylight Saving Time (DST) P. 17 ~ 18,”
to set Daylight Saving Time (DST).
How to manually set the time zone
1
Continue to press Button C ( 3
seconds ), and when the second
hand has stopped, release it.
The second hand moves
to display the currently set
time zone.
2
Press Button B or Button C to adjust the second
hand to the time zone of the destination
When the button is pressed once, the
second hand moves to the next zone.
For the relationship between the position
of the second hand and the time zone,
refer to the “Time zone display and list of
time zones around the world P. 9.”
3
< Display of the indicator hand >
Displays ON/OFF setting of Daylight
Saving Time (DST).
DST
ON
If the time for pressing is short,
the watch will enter operation
for checking the time zone
setting (P. 16), so make certain
to press the button for 3
seconds.
Button B
clockwise
Button C
counterclockwise
If Daylight Saving Time (DST) is not
correct, change over ON/OFF with
reference to “Set Daylight Saving Time
(DST) P. 17 ~ 18” after operation of 3.
If the second hand is stopped for one minute or longer, the watch will automatically return to the time display mode.
20
The second hand starts moving.
During movement of the date, the
buttons and crown cannot be operated.
OFF
Display
Press for
3 seconds
When the hour and minute
hands stop moving, press
Button A
Press
Button A.
CONTENTS
4
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
To set only the time (manual time adjustment)
Manual time adjustment
The watch can be set to the precise current time of the currently set time zone.
(The time zone is not changed.)
 How to manually adjust the time P. 22
 Check the time zone setting P. 16
In the manual time adjustment, the precise time of the currently set time zone is displayed.
When the region or time zone where the watch is used is changed, adjust the time zone.  How to adjust the time zone P. 14 ~ 16
(If the time zone is adjusted, the time zone setting, time and date will be adjusted, so it is not necessary to manually adjust the
time immediately thereafter.)
Daylight Saving Time (DST) is not automatically set. Carry out the setting manually.  Set Daylight Saving Time (DST) P. 17 ~ 18
Failure or success of reception depends on the reception environment.  Place where GPS signals can be easily received/Place
where GPS signals cannot be received P. 13
At the time when the reception was successful by manually adjusting the time, automatic time adjustment may be performed. For
details, refer to “Automatic time adjustment P. 23 <When it is difficult to exposure to light>.”
GPS signal reception consumes a lot of energy.
Keep in mind to charge the watch regularly by expose to light so that the indicator hand points to the “level position (middle)” or
“F (full).”  How to charge the watch P. 11
(When the charging status becomes “E (low),” the reception will not start even with operation of GPS signal reception.)
 Check the charging status. P. 10
21
Continued on the
following page
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
How to manually adjust the time
1
Go to a place where
GPS signals can be
easily received
Move to the outdoors under
an open sky with good
visibility.
2
Continue to press Button B (3 seconds),
and then release it when the second hand
moves to the 0-second position.
3
4
Direct the watch face
upward and wait
When the second hand has reached the
0-second position, reception is started.
The indicator hand points to “1.”
It takes up to one
minute to complete
reception.
The reception time
depends on the
reception conditions.
Press for
3 seconds.
< Display during reception (= satellites
acquisition status) >
The second hand indicates ease of receiving
(= number of GPS satellites from which GPS
signals are received).
 Place where GPS signals
can be easily received/Place
where GPS signals cannot
be received P. 13
To acquire only time information, the number
of satellites necessary for reception is one.
While the indicator hand points to “E” or ,
reception is not started even with operation for
reception.
When the hand points to “E,” charge the watch
by expose to light.
How to charge the watch P. 11

Check the charging status. P. 10
Number of
acquired
satellites
1
Display
When the hand points to , reset the in-flight
mode ( ).
How to reset in-flight mode ( ) P. 19
State
C
BP JY
J
The reception result is displayed for 5
seconds.
Then, the hour and minute hands move,
and the time and date are adjusted.
Reception
result
display
Display
State
Y: Successful
N: Failed
C
BP JY
J
Use the
watch as it is.
C
BP JY
J
 When the
reception result
is displayed as
“N” P. 42
Check that the reception is successful after
the watch returns to the time display mode.
C
BP JY
J
Easy to
receive
To cancel the
reception, press
Button A.
22
0
When the second hand points
to “Y” or “N,” reception is
completed.
Cannot
receive
Check that the reception was successful
P. 24
When the time is not correct even if
“Y” is displayed, the time zone may not
correspond to the region where you are.
Check the time zone setting.
Set the time zone P. 14 ~ 16
Press
Button A.
During movement of the date, the buttons
and crown cannot be operated.
Manually set Daylight Saving Time (DST).
Set Daylight Saving Time (DST) P. 17 ~ 18
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
Automatic time adjustment
This watch can be set to the precise current time by automatically receiving GPS signals by exposure to bright light
outdoors under an open sky to adjust the time.
In addition, when the watch is concealed under a sleeve and the dial is not exposed to sufficient light even if outdoors
under an open sky, the watch stores the time of the previous successful manual time adjustment (or time zone
adjustment), and automatically starts time adjustment at the same time.
In a place without good visibility, GPS signals cannot be received.  Place where GPS signals can be easily received/Place where GPS signals cannot be
received P. 13
If the energy is sufficiently charged, automatic reception will be performed every day.
The automatic time adjustment is performed at most once per day. Therefore, even if automatic time adjustment has failed, the next automatic time
adjustment will be performed the next day or thereafter.
During reception, the hands move in the same manner as the manual time adjustment.
 How to manually adjust the time P. 21 ~ 22
The time zone is not adjusted in the automatic time adjustment.
When the region where the watch is used is changed, please carry out time zone adjustment. How to adjust the time zone P. 14 ~ 16
< When it is difficult to expose to light sufficiently >
Even if outdoors under an open sky, when the watch is concealed under a sleeve in winter time, etc., in an area where the
daylight hours are short, or when the watch is not likely to be exposed to sufficient light for a long time due to bad weather,
the watch is designed to allow for automatic time reception at the time when the manual time adjustment was successful
the last time.
When the watch is exposed to the operating environment above, automatic time adjustment is likely to be successful by
making manual time adjustment successful in time periods where the watch is frequently used in a place where GPS signals
can be easily received under an open sky.
 How to manually adjust the time P. 22
However, as the watch judges to start automatic time adjustment taking into consideration the following conditions,
the watch does not necessarily start automatic time adjustment by exposure to bright light.
•Charging status
•Past reception status
When the indicator hand points to “E (low),” or in the in-flight mode ( ), automatic time adjustment does not work.
When the indicator hand points to “E,” charge the watch by expose to light.  How to charge the watch P. 11
 Check the charging status P. 10
When the energy is reduced, the period for which automatic time adjustment is not performed becomes longer. Keep in mind to charge the watch regularly.
If the time zone adjustment or manual time adjustment is performed before the automatic time adjustment is started, the automatic time adjustment is not
performed on that day.
23
7th
6th
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
Check that reception was successful (reception result display)
The type of reception and reception result (success or failure) of the last GPS signal reception is displayed for 5 seconds.
1
Press Button B once and
then release it
The second hand and indicator hand
display the reception result.
Press
once and
release it
When the reception result
is Y
2 Check that reception was successful (within 5 seconds)
The second hand displays the reception
result (success/failure).
The indicator hand displays which of the
last GPS signal reception was performed
for time adjustment or time zone
adjustment.
When Button B
is kept pressed,
the watch enters
the Manual
time adjustment
operation.
Second hand: Reception result
(success/failure)
Result
Display
Position
Successful
C
BP JY
J
Y 12-second
position
Failed
C
BP JY
J
N 18-second
position
Indicator hand: Reception method (manual
time adjustment or time zone adjustment)
Type
Press
Button A.
1 (Manual time
adjustment)
4+ (Time zone
adjustment)
Display
 The time at which the watch returns to the time
After 5 seconds have elapsed or
when Button A is pressed, the watch
display mode varies depending on the position of the
indicator hand.
returns to the time display mode.
•The reception was successful.
Use the watch as it is.
When the reception result
is N
•Move to the outdoors where
GPS signals can be easily
received as necessary to receive
GPS signals.
 Place where GPS signals can be easily
received/Place where GPS signals cannot
be received P. 13
When approximately five days have
elapsed after successful reception, the
reception result display becomes “N.”
Even under a state where GPS signal
cannot be received, the watch operates
with quartz accuracy (at loss/gain ±15
seconds per month).
When the reception has failed in
any way, manually set the time
and date.
 How to manually set the time P. 43
 How to manually set the date P. 44
24
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
Dual time display
Respective times of two regions can be displayed by the dial and sub-dial.
Example: Honolulu time and Japan time are respectively displayed by the dial and sub-dial.
Dial: Local time (Honolulu)
Honolulu time (UTC -10 hours): 15:10:42
Date: Day of 6th
Sub-dial: Home time (Japan)
Japan time: 10:10 (UTC +9 hours)
 How to set the sub-dial P. 26
25
Continued on the
following page
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
ASTRON 7X52 GPS SOLAR
CONTENTS
4
How to set the sub-dial
• The sub-dial displays the time in a
24-hour system.
• Even when the time zone of the
dial is changed, the time of the
sub-dial is not changed.
The sub-dial moves independently
from the dial.
1 Unlock the crown
Unlock the crown
Turn the crown counterclockwise
(downward) to unscrew it. Now
the crown can be operated.
Unscrew
Crown locked
out the crown to
2 Pull
the first click
Button B or Button C
3 Press
to set the time
The watch enters the time setting
mode of the sub-dial.
4 Push the crown back in
Operation has been completed.
(Hands on the main-dial keep
moving.)
Press
once to
advance
1 minute
0 1 2
0 1
2
Press
once to
set back
1 minute
Pull out
to the first
click
When the button is kept
pressed for 2 seconds or
longer, the sub-dial hour/
minute hands will start to
move continuously, and
when it is pressed again,
they stop moving.
Crown unlocked
Push
back in
Lock the crown
Turn the crown clockwise (upward)
while gently pressing it in toward
the watch body until it stops.
While pressing the crown in
Screw
Screw-lock type crown P.34
26
DETAILED INFORMATION
ASTRON 7X52 GPS SOLAR
CONTENTS
5
Mechanism by which the GPS watch sets time and date
What GPS is
GPS stands for Global Positioning System, a satellite positioning system
for determining the current position on the earth.
24 satellites cover the earth, and at present, the system is operated by
approximately 30 GPS satellites.
Wherever you are in the world, the position can be determined
(positioned) by information from more than 4 GPS satellites.
GPS satellite
This is a satellite operated by the United States
Department of Defense (official name is NAVSTAR), and
orbits the earth at an altitude of 20,000 km.
Initially, this was a military satellite, but at present,
information is partially disclosed to the public and used in
various equipment including car navigation systems and
cellular phones.
The GPS satellite is mounted with a high-accuracy atomic
clock with an accuracy deviation of 1 second per 100,000
years.
27
Mechanism by which this watch sets the time
and date
This watch receives GPS signals from GPS satellites to set the
time and date based on the following information.
• Precise time and date based on the atomic clock
• Information about a time zone where you are
(The current location is basically positioned by more
than 4 GPS satellites, and which zone of the total of 39
time zones around the world you are in is identified.)
 To receive information about a time zone where you
are, it is necessary to adjust the time zone.
 How to adjust the time zone P. 14 ~ 16
 Unlike navigation equipment, this GPS solar watch is
not designed to constantly receive GPS signals from
GPS satellites without any operation.
This watch receives GPS signals from GPS satellites
only in the time zone adjustment mode, automatic or
manual time adjustment mode.
DETAILED INFORMATION
ASTRON 7X52 GPS SOLAR
CONTENTS
5
Time zone
Time zone
Based on Coordinated Universal Time (UTC), the standard time
commonly used is adopted by countries and regions around the world.
The standard time is determined by each country or region, and the
region where the same standard time is adopted is referred to as the
time zone, and presently, the time zone is divided into 39 zones.
Further, Daylight Saving Time (DST) is individually adopted in countries
and regions.
Coordinated Universal Time (UTC)
UTC is the universal standard time coordinated through an
international agreement. This is used as the official time for recording
time around the world. The time obtained by adding a leap second
to the “International Atomic Time (TAI)” determined based on the
atomic clock around the world and coordinated in order to compensate
for deviations from universal time (UT) which is astronomically
determined is the UTC.
 Each time zone is based on data as of January 2012.
 Please be advised that regions for which the time zone is changed thereafter cannot be
reflected.
28
 The time differences and use of daylight saving time in each city are subject to
change according to the governments of the respective countries or regions.
DETAILED INFORMATION
ASTRON 7X52 GPS SOLAR
CONTENTS
5
GPS signal reception
GPS signal reception includes three types. Features for each type are as follows.
Reception
method
Display
Time adjustment
How to manually
adjust the time
 P. 21 ~ 22
Automatic time
adjustment  P. 23
Time adjustment
Features
Precise current time of the set
time zone is displayed
 Check the set time zone  P. 16
GPS signal reception Q & A
Leap second data
reception
Time zone adjustment
How to adjust the time
zone  P. 14 ~ 16
Time zone identification and
time adjustment
Time zone where you are is identified,
and the precise current time is
displayed
Leap second
reception
Ready for leap second
data reception and
receiving lead second
data  P. 30
Number of
acquired satellites
necessary for
reception
One unit (to obtain only time
information)
Basically more than 4 units (to obtain
time information and time zone
information)
Time taken for
reception
6 seconds to 1 minute
30 seconds to 2 minutes
Up to 18 minutes
When the watch is used in a different
time zone
This is automatically
displayed after time
zone adjustment or
time adjustment is
performed around
June or December
What kind of
situation
To set the watch to the precise
time while it is used in the same
time zone
29
Q:When the watch is moved to a different time zone, does the
watch automatically display the local time?
A:The watch does not automatically display the local time just
by being moved. If you are in a place where GPS signals
can be easily received, adjust the time zone. The watch
automatically displays the local time.
When you are in a place where GPS signals cannot be
received, manually set the time zone.
 Manual time zone setting P. 20
(The watch can be set to a total of 39 time zones around the
world.)
Q:Is Daylight Saving Time (DST) automatically changed by
receiving GPS signals?
A:Manually set Daylight Saving Time (DST).
 Set Daylight Saving Time (DST) P. 17 ~ 18
(GPS signals from GPS satellites do not include information
about Daylight Saving Time (DST).)
Even in the same time zone, some countries and regions do
not adopt Daylight Saving Time (DST).
 Daylight Saving Time (DST) P. 17
Q:Is it necessary to carry out special operation for years in which
a leap second is added?
A:No special operation is necessary.
Since the watch receives leap second data at the same time
of receiving GPS signals around June or December, a leap
second is automatically added by periodically receiving GPS
signals. For details, refer to “Leap second (automatic leap
second reception function)  P. 30.”
DETAILED INFORMATION
ASTRON 7X52 GPS SOLAR
CONTENTS
5
Leap second (Automatic leap second reception function)
Leap second
The leap second is to
compensate for deviations from
the universal time (UT) which is
astronomically determined and
the “International Atomic Time
(TAI).
“1 second” may be added
(deleted) once a year or every
few years.
Automatic leap second
reception function
A leap second is automatically
added by receiving “leap
second data” from GPS signals
at the time of leap second
addition.
Reception of leap second data
The indicator hand displays as shown at the right when GPS signals are received (time
zone adjustment or time adjustment) around June or December (display of being ready
for leap second data reception or receiving leap second data). At this time, the second
hand points to any of the 0 to 18-second positions to indicate the waiting time until
the leap second data reception by minutes. The waiting time is subtracted for each
minute, and when the second hand points to the 0-second position, the leap second data
reception is started. It is recommended you move to a place where GPS signals can be
easily received.
 Place where GPS signals can be easily received/Place where GPS signals cannot be received P. 13
The position of the second hand is an indication of the time until the leap second data reception is started.
(When the second hand points to the 6-second position, it means that the reception will be started approximately 6 minutes later.)
At this time, the second hand does not move at one-second intervals, however, it does not mean a failure.
The second hand moves in the same manner as the manual time adjustment during the leap second data reception.
 How to manually adjust the time P. 21 ~ 22
When the leap second data reception is completed, after the reception result is displayed, the second hand starts
moving at 1-second intervals.
The indicator hand also returns to display the charging status. Use the watch as it is.
The leap second data reception is performed every half a year regardless of leap second addition.
“Leap second data” includes
information about future leap second
addition and current leap second data.
When GPS signals are received under the following conditions, the leap second data reception is also started.
• GPS signals are received after the system reset
• GPS signals have not been received for a long time
• Leap second data reception has failed
(Leap second data reception is performed again during the next GPS signal reception. It is repeated until the leap second data reception is successful.)
30
IN CASE OF AN UNUSUAL MOVEMENT OF THE SECOND HAND
ASTRON 7X52 GPS SOLAR
CONTENTS
6
Second hand movement and watch state (energy depletion forewarning function)
Movement of the second hand shows the state of the watch (working functions).
2-second interval movement/5-second interval movement are brought about
When the energy stored in the watch runs low, the energy depletion forewarning function will work.
When the energy stored in the watch runs low, charge the watch by expose to light.  How to charge the watch
P. 11
When the energy depletion forewarning function works, the watch does not operate even with operation of the buttons and crown.
(Be assured that it does not mean a failure)
2-second interval movement
5-second interval movement
The second hand moves at 2-second intervals.
The second hand moves at 5-second intervals.
• Reception is not started even with operation of GPS signal
reception.
• Automatic time adjustment does not work.
• The hour hand, minute hand, date, and sub-dial stop.
• Reception is not started even with operation of GPS signal
reception.
• Automatic time adjustment does not work.
(1) First, charge the watch by expose to light until the second hand
moves at 1-second intervals.
 How to charge the watch P. 11
(2) Keep in mind to charge the watch until the indicator hand points
to the “level position (middle)” or “F (full).” (If the indicator hand
points to “E,” GPS signals cannot be received.)
 Check the charging status P. 10
(1) Charge the watch until the indicator hand points to the “level
position (middle)” or “F (full).”
 Check the charging status P. 10
(2) Carry out time zone adjustment to set the time.
 How to adjust the time zone P. 14 ~ 16
State
Restriction on function/
display
Solution
31
Continued on the
following page
IN CASE OF AN UNUSUAL MOVEMENT OF THE SECOND HAND
ASTRON 7X52 GPS SOLAR
The second hand stops at the 15-second position/45second position (Power save function)
When the watch is not exposed to light for a long time, the power save function will work.
Power Save 1
The second hand stops pointing
at the 15-second position.
Power Save 2
The second hand stops at the 0-second or
5-second position (automatic time adjustment)
Automatic time adjustment is being performed.
 Automatic time adjustment P. 23
The indicator hand points to “1.”
The second hand stops pointing at
the 45-second position.
It takes up to 1 minute to complete reception.
Use the watch with reference to the “Place
where GPS signals can be easily received P. 13.”
State
The second hand is stopped between the 0-second to
18-second positions (Ready for leap second data reception)
Restriction • The hour hand, minute hand,
on
date, and sub-dial stop.
function/ • Automatic time adjustment is
not performed.
display
Cause
Solution
• The hour hand, minute hand, date,
and sub-dial stop.
(Date displays “1.”)
• Reception is not started even with
operation of GPS signal reception.
• Automatic time adjustment is not
performed.
• The indicator hand points to “E.”
When the watch is exposed to
a state without receiving an
adequate light source for 72
hours or longer.
When the watch is in an insufficient
charging state for a long time.
When the watch is exposed
to an adequate light source
for more than 5 seconds, or
when any button is pressed, it
displays the current time again
after the second hand is rapidly
advanced.
(1)Charge the watch sufficiently until
the charging status is displayed
as the “level position (middle)” or
“F (full).”  P. 10 ~ 11
(2)Carry out time zone adjustment
to set the time.  P. 14 ~ 16
Power Save 2
 While the watch is being charged, the second hand moves at “ 5-second Intervals.”
During the “5-second Interval Movement,” neither the buttons nor the crown can be operated.
 If the “ Power Save 2” mode is prolonged, the stored power amount drops and the internal
current time information stored will be lost.
Displays the watch ready for leap second data reception.
At this time, the second hand is stopped between the
0-second to 18-second positions to indicate the waiting
time until the leap second data reception by minutes.
The waiting time is subtracted for each minute,
and when the second hand points to the 0-second
position, the leap second data reception is started.
It is recommended that you move to a place where
GPS signals can be easily received.
 Place where GPS signals can be easily received/Place where GPS signals cannot be received P. 13
 The position of the second hand is an indication of the time when the leap second data is started.
(When the second hand points to the 6-second position, it means that the reception will be started
approximately 6 minutes later.)
 At this time, the second hand does not move at 1-second intervals, however, it does not mean a failure.
 Automatic leap second reception function P. 30
The display of being ready for leap second data reception continues up to 18
minutes, and then the watch starts receiving the leap second data.
During the reception, the second hand moves in the same manner as the manual
time adjustment.  How to manually adjust the time P. 21 ~ 22
When the leap second data reception is completed, the second hand moves at
one-second intervals.
Use the watch as it is.
 The leap second data reception is performed every half a year regardless of leap second addition.
32
CONTENTS
6
TO PRESERVE THE QUALITY OF YOUR WATCH
ASTRON 7X52 GPS SOLAR
CONTENTS
7
Daily care
Performance and caliber / case number
The case back shows the performance and
caliber / case number of your watch
●The watch requires good daily care
• Do not wash the watch when its crown is at the extended position.
• Wipe away moisture, sweat or dirt with a soft cloth
• After soaking the watch in seawater, be sure to wash the watch in clean
pure water and wipe it dry carefully.
Water resistance
Refer to P. 35
 If your watch is rated as “non-water resistant” or “water resistant for daily use,” do not
wash the watch.
Performance and caliber / case number  P. 33
Water resistance  P. 35
Magnetic resistance
Refer to page P. 36
●Turn the crown from time to time
• In order to prevent corrosion of the crown, turn the crown from time to
time.
• The same practice should be applied to a screw lock type crown.  P. 34
Caliber/case number
The number to identify
the type of your watch
●Press the buttons once in a while.
• Press the buttons once in a while to prevent corrosion of the buttons.
 If the display is changed by pressing any button, wait and leave it as is.
 The above figures are examples. Both of them may be different
from the figure on the case back of your watch.
33
TO PRESERVE THE QUALITY OF YOUR WATCH
ASTRON 7X52 GPS SOLAR
CONTENTS
7
Screw-lock type crown
The screw-lock type crown features a mechanism that can securely lock the crown when they are not
being operated in order to prevent any operational errors and to improve its water resistant property.
●It is necessary to unlock the screw-lock type crown before operating it.
●Once you have finished operating the crown, make sure to relock it.
[ To unlock the crown ]
[ To lock the crown ]
Turn the crown counterclockwise
(downward) to unscrew it. Now the
crown can be operated.
Turn the crown clockwise (upward)
while gently pressing it in toward
the watch body until it stops.
Unlock the crown
before operating it. Crown locked
Crown unlocked
Unscrew
After operating the
crown, lock it.
While pressing
the crown in
Screw
 When locking the crown, turn it slowly with care, ensuring that the screw is properly engaged.
Be careful not to forcibly push it in, as doing so may damage the screw hole in the case.
34
TO PRESERVE THE QUALITY OF YOUR WATCH
ASTRON 7X52 GPS SOLAR
CONTENTS
7
Water resistance
Refer to the table below for the description of each degree of water resistant performance of your watch before using.
Indication on the case back
No indication
Water Resistant
Water Resistant 5 BAR
Water Resistant 10 (20) Bar
Water resistant performance
Conditions of Use
Non-water resistance
Water resistance for everyday life
Avoid drops of water or sweat
The watch withstands accidental
contact with water in everyday life
Water resistance for everyday life at 5 barometric
pressures
Not suitable for
WARNING swimming
The watch is suitable for swimming.
Water resistance for everyday life at 10 (20)
barometric pressures
The watch is suitable for diving not using an air cylinder.
35
TO PRESERVE THE QUALITY OF YOUR WATCH
ASTRON 7X52 GPS SOLAR
CONTENTS
7
Magnetic resistance (Magnetic influence)
Examples of common magnetic products that may affect watches
This watch may be affected by nearby magnetism and temporarily
gain or lose time or stop operating.
 Even when the watch gains or loses time due to magnetic influence, the hand positions
are automatically adjusted by the “automatic hand position adjustment function.” (P. 50)
This watch has magnetic resistance which complies with ISO
“Magnetic resistant watches” .
Smartphone, cellular phone,
tablet terminal (speaker)
AC adapter
Bag
(with magnet
buckle)
Caution
Keep the watch more than 5cm away from magnetic products.
AC-powered
shaver
If the watch becomes magnetized and its accuracy deteriorates to
an extent exceeding the specified rate under normal use, there will
be a charge for demagnetization and accuracy readjustment even if
it occurs within the guarantee period.
The reason why this watch is affected by magnetism
The built-in motor is provided with a magnet, which may be
influenced by a strong external magnetic field.
36
Magnetic
cooking device
Portable radio
(speaker)
Magnetic
necklace
Magnetic
healt pillow
TO PRESERVE THE QUALITY OF YOUR WATCH
ASTRON 7X52 GPS SOLAR
CONTENTS
7
Band
The band touches the skin directly and becomes dirty with sweat or dust.
Therefore, lack of care may accelerate deterioration of the band or cause skin
irritation or stain on the sleeve edge. The watch requires a lot of attention for
long usage.
●Metallic band
●Polyurethane band
• Moisture, sweat or soil will cause rust even on a stainless steel band if they
are left for a long time.
• Lack of care may cause a yellowish or gold stain on the lower sleeve edge of
shirts.
• Wipe off moisture, sweat or soil with a soft cloth as soon as possible
• To clean the soil around the joint gaps of the band, wipe it out in water and
then brush it off with a soft toothbrush (Protect the watch body from water
splashes by wrapping it up in plastic wrap etc.)
• Because some titan bracelets use pins made of stainless steel, which has
outstanding strength, rust may form in the stainless steel parts.
• If rust advances, pins may poke out or drop out, and the watch case may fall
off the bracelet, or the clasp may not open.
• If a pin is poking out, personal injury may result. In such a case, refrain from
using the watch and request repair.
●Leather band
• A leather band is susceptible to discoloration and deterioration from
moisture, sweat and direct sunlight.
• Wipe off moisture and sweat as soon as possible by gently blotting them up
with a dry cloth.
• Do not expose the watch to direct sunlight for a long time.
• Please take care when wearing a watch with light-colored band, as dirt is
likely to show up.
• Refrain from wearing a leather band watch other than Aqua Free bands while
bathing, swimming, and when working with water even if the watch itself is
water-resistant enforced for daily use (10-BAR/20-BAR water resistant).
37
• A polyurethane band is susceptible to discoloration from light, and may be
deteriorated by solvent or atmospheric humidity.
• Especially a translucent, white, or pale colored band easily adsorbs other
colors, resulting in color smears or discoloration.
• Wash out dirt in water and clean it off with a dry cloth. (Protect the watch
body from water splashes by wrapping it up in plastic wrap etc.)
• When the band becomes less flexible, have the band replaced with a new
one. If you continue to use the band as it is, the band may develop cracks or
become brittle over time.
●Silicone band
• As for material characteristics, the band is easily dirtied, and may be stained
and discolored. Wipe off dirt with a wet cloth or cleaning tissue.
• Unlike bands of other materials, cracks may result in the band being cut.
Take care not to damage the band with an edged tool.
Notes on skin
irritation and
allergy
Skin irritation caused by a band has various reasons
such as allergy to metals or leathers, or skin reactions
against friction on dust or the band itself.
Notes on the
length of the
band
Adjust the band to allow a little clearance with
your wrist to ensure proper airflow. When
wearing the watch, leave enough room to insert
a finger between the band and your wrist.
TO PRESERVE THE QUALITY OF YOUR WATCH
ASTRON 7X52 GPS SOLAR
CONTENTS
7
How to use an adjustable three-fold clasp
●How to adjust the length of the leather band
Some bands are provided with an
adjustable three-fold clasp.
If the clasp of the watch you purchased is
as follows, please refer to the following
instructions.
1
With pressing buttons on both
sides of the flap, pull the leather
band out of the moveable loop and
fixed loop. Then open the clasp.
●How to wear or take off the watch
1
Press the button on both sides of
the flap ; pull the buckle up.
The band will automatically come
out of the loop.
2
Buckle
Place the tip of the band into the
moveable loop and fixed loop, and
fasten the clasp by pressing the
frame of the buckle.
Buckle
Fixed loop
Moveable loop
the push buttons again to
2 Press
unfasten the flap.
3
Push button
Flap
Push button
Fixed loop
Moveable loop
Flap
Pull the pin out of a adjustment
hole of the band.
Slide the band to adjust its length
and find an appropriate hole. Place
the pin into the hole.
Pin
4 Fasten the flap.
Adjustment hole
The above illustrations are provided as examples.
Some details may differ depending on the model.
38
TO PRESERVE THE QUALITY OF YOUR WATCH
ASTRON 7X52 GPS SOLAR
CONTENTS
7
Lumibrite
If your watch has Lumibrite
Lumibrite is a luminous paint that is completely harmless to human beings and natural environment, containing no
noxious materials such as radioactive substance. Lumibrite is a newly-developed luminous paint that absorbs the light
energy of the sunlight and lighting apparatus in a short time and stores it to emit light in the dark. For example, if
exposed to a light of more than 500 lux for approximately 10 minutes, Lumibrite can emit light for 3 to 5 hours.
Please note, however, that, as Lumibrite emits the light it stores, the luminance level of the light decreases gradually
over time. The duration of the emitted light may also differ slightly depending on such factors as the brightness of the
place where the watch is exposed to light and the distance from the light source to the watch.
 In general, when you enter a dark place from a bright environment, your eye cannot adapt to the change in light levels quickly. At first, you can hardly see anything,
but as time passes, your vision gradually improves. (Dark adaptation of the human eye)
< Reference data on the luminance >
Condition
Illumination
Fine weather
100,000 lux
Cloudy weather
10,000 lux
Sunlight
Fine weather
Indoor (Window-side
during daytime)
Lighting apparatus
(Distance from 40-watt
daylight fluorescent
light)
more than 3,000 lux
Cloudy weather
1,000 to 3,000 lux
Rainy weather
less than 1,000 lux
1m
1,000 lux
3m
500 lux (average room luminance)
4m
250 lux
39
TO PRESERVE THE QUALITY OF YOUR WATCH
ASTRON 7X52 GPS SOLAR
CONTENTS
7
Power Source
The battery used in this watch is a special secondary battery,
which is different from ordinary batteries. Unlike an ordinary silver
oxide battery, the secondary battery does not require periodic
replacement.
Overcharge prevention function
When the secondary battery is fully charged, the overcharge
prevention function is automatically activated to avoid further
charging. There is no need to worry about damage caused by
overcharging no matter how much the secondary battery is charged
in excess of the "time required for fully charging the watch".
The capacity or charging efficiency may gradually lower due to
long-term use or operating environment. In addition, long-term
use may shorten the charge duration due to wear, contamination,
lubricant deterioration of mechanical parts, etc. Request repair
when the performance lowers.
 Refer to "Standard charging time" on page 11 to check the time required for fully
charging the watch.
WARNING
Notes on charging the watch
WARNING
• When charging the watch, do not place the watch in close
proximity to an intense light source such as lighting equipment
for photography, spotlights or incandescent lights, as the
watch may be excessively heated resulting in damage to its
internal parts.
• When charging the watch by exposure to direct sunlight,
avoid places that easily reach high temperatures, such as a car
dashboard.
• Always keep the watch temperature under 60°C.
Notes on replacing the second battery
• Do not remove the secondary battery from the watch.
Replacement of the secondary battery requires professional
knowledge and skill. Please ask the retailer from whom the
watch was purchased for replacement of the secondary battery.
• Installation of an ordinary silver oxide battery can generate
heat that can cause bursting and ignition.
When the watch has not been charged for a long time
If the watch has not been charged for a long time, the watch will be
completely discharged and no longer able to be charged.
In this case, consult the retailer from whom the watch was
purchased.
40
TO PRESERVE THE QUALITY OF YOUR WATCH
ASTRON 7X52 GPS SOLAR
CONTENTS
7
標準化
After-sale service
●Notes on guarantee and repair
●Inspection and adjustment by disassembly and
cleaning (overhaul)
• Contact the retailer from whom the watch was purchased or SEIKO
WORLWIDE SERVICE NETWORK for repair or overhaul.
• Within the guarantee period, present the certificate of guarantee to
receive repair services.
• Guarantee coverage is provided in the certificate of guarantee. Read
carefully and retain it.
• For repair services after the guarantee period has expired, if the
functions of the watch can be restored by repair work, we will
undertake repair services upon request and payment.
• Periodic inspection and adjustment by disassembly and cleaning
(overhaul) is recommended approximately once every 3 to 4 years
in order to maintain optimal performance of the watch for a long
time. According to use conditions, the oil retaining condition of your
watch mechanical parts may deteriorate, abrasion of the parts may
occur due to contamination of oil, which may ultimately lead the
watch itself to stop. As the parts such as gasket may deteriorate,
water-resistant performance may be impaired due to intrusion
of perspiration and moisture. Please contact the retailer from
whom the watch was purchased for inspection and adjustment by
disassembly and cleaning (overhaul). For replacement of parts,
please specify “SEIKO GENUINE PARTS.” When asking for inspection
and adjustment by disassembly and cleaning (overhaul), make sure
that the gasket and push pin are also replaced with new ones.
• When your watch is inspected and adjusted by disassembly and
cleaning (overhauled), the movement of your watch may be
replaced.
●Replacement parts
• SEIKO makes it a policy to typically keep a stock of replacement
parts for this watch for 7 years. Replacement parts are those which
are essential to maintaining the functional integrity of the watch.
• Please keep in mind that if original parts are not available, they may
be replaced with substitutes whose outward appearance may differ
from the originals.
41
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
When the watch is unable to receive GPS signals
● The second hand stops at the 45-second position before the reception is
completed (The watch enters the power save 2 state)
Points to be checked
When the watch does not start receiving or is unable to receive GPS
signals even with operation of GPS signal reception, the following can
be considered.
• If GPS signal reception is performed under low temperatures (0°C or less) in a
state where the charging capacity and/or charging efficiency are lowered, the
reception will be stopped, and the watch may enter the power save 2 state.
If this occurs frequently, consult the retailer from whom the watch was
purchased.
GPS signal reception consumes a significant amount of energy. Keep in mind to
charge the watch regularly by expose to light.
● Reception is not started even with operation of GPS signal
reception (time zone adjustment/manual time adjustment).
• Check the indicator hand position.
Reception is
not allowed
Indicator
display
How to charge the watch P. 11
Charging status
E (low)
In-flight mode ( )
Adjust the time under a condition in which the watch is
unable to receive GPS signals (Manual time/date setting)
Display
Manual time/date setting
Solution
Charge the watch by
expose to light until the
indicator hand points
to the “level position
(middle)” or “F (full).” (P.11)
When a problem cannot be solved even by carrying out the “ Points
to be checked,” or time is gained or lost under a condition in which
the watch is unable to receive GPS signals and the watch is unable to
receive GPS signals continuously, set the time and date manually.
Reset the in-flight
mode ( ).  P. 19
● Reception is not possible even with operation of GPS signal
reception (time zone adjustment/manual time adjustment) (The
reception result is displayed as “N.”)
• Move to a place where GPS signals can be easily received.
 Place where GPS signals can be easily received/Place where
GPS signals cannot be received P. 13
42
Continued on the
following page
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
How to manually set the time
• When using the watch again under a condition in which the watch is able to receive GPS signals, receive GPS signals to set the time.
• When adjusting the time, the date will be accordingly adjusted.
1
3
Unlock the crown
Unlock the crown
Screw-lock type crown P.34
Unscrew
out the crown to the
2 Pull
second click
Continue to press Button A (3 seconds)
and then release it when the hand
moves to the 0-second position
The second hand moves to stop
at the 0-second position.
The watch enters the manual
time setting mode.
4
Press Button B or Button C to set
the time
Press
once to
advance
1 minute
5
Push the crown back (in
simultaneously with a time
signal)
Operation has been completed.
The watch resumes its normal
movement.
When the button is kept pressed
for 2 seconds or longer, the hour/
minute hands will start to move
continuously, and when it is
pressed again, they stop moving.
Press for
3 seconds
0 1 2
Press
once to
set back
1 minute
Push
back in
The second hand moves to the
13-second position and stops.
0 1 2
The hands will not move by turning the
crown.
When the watch enters the manual
time setting mode, the reception
result will be displayed as “N,” since
the reception results data will be lost.
Lock the crown.
While pressing the crown in
 The point in which the date changes is at
0:00 AM (12:00 PM). Set the time taking
into consideration AM or PM.
Pull out the
crown to
the second
click
Screw
Even if GPS signals cannot be received, the watch can be used with the same accuracy as a
normal quartz watch. (at loss/gain ±15 seconds per month on average)
If the watch receives GPS signals after manual time setting, it displays the received time.
43
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
How to manually set the date
When the date is not automatically
changed under a condition in which the
watch is unable to receive GPS signals
(when changing from months with 30
days or less to months with 31 days),
set the date manually.
• The date can be set independently
regardless of the time.
• When using the watch again under a
condition in which the watch is able
to receive GPS signals, receive GPS
signals to set the time and date.
out the crown to the
2 Pull
second click
Button B or Button C
3 Press
to set the date
The second hand moves to the
13-second position and stops.
Operation has been completed.
Press
once to
advance
the date
1 day.
0 1 2
When the button is kept
pressed for 2 seconds or
longer, the date will start to
move continuously.
Press the button again to stop.
0 1 2
How to adjust the time zone P. 14 ~ 16
When the date is not correct even when the
watch has successfully received GPS signals,
the preliminary position of the date may be
misaligned.
 Adjust the preliminary positions of the
date, indicator hand and hour/minute
hands P. 45 ~ P. 47
4 Push the crown back in
Pull out
to the
second
click
Press
once to
return
the date
1 day.
1 Unlock the crown
Push
back in
Lock the crown.
When the watch enters the manual time
setting mode, the reception result will
be displayed as “N,” since the reception
results data will be lost.
Unlock the crown
Screw-lock type crown P. 34
The date will not move by turning the
crown.
Unscrew
During movement of the date, the
buttons cannot be operated.
44
While pressing the crown in
Screw
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
When the time/date or indicator hand position is misaligned
The preliminary position is misaligned due to the following reasons.
Points to be checked
●Reception was successful (the reception result is displayed as “Y”),
but time has gained or lost.
•Check the time zone setting.
Check the time zone setting P. 16
Strong impact such as dropping
or hitting
If the currently set time zone does not correspond to the region where you are, set the
time zone by either of the following operations.
Place where GPS signals can be easily received  How to adjust the time zone P. 14 ~ 16
Place where GPS signals cannot be received  How to manually set the time zone P. 20
Things around you which generate magnetism
Examples of common magnetic products that may
affect watches P. 36
When comparing the state of “Misaligned Preliminary Hand Position” to that of a weight scale, it is
like “a scale which is unable to display the correct weight because its needle is not set to the zero
position before weighing.”
•Check Daylight Saving Time (DST) setting
Check Daylight Saving Time (DST) setting P. 17
If Daylight Saving Time (DST) setting does not correspond to the addition conditions of
Daylight Saving Time (DST) of the region where you are, set Daylight Saving Time (DST)
with reference to “Set Daylight Saving Time (DST) P. 18.”
•Automatic time adjustment function may not have been activated
for a few days.
Automatic time adjustment P. 23
Automatic hand position alignment function
The hour, minute, and second hands have an “automatic hand position adjustment
function,” which automatically corrects an incorrect preliminary position.
The automatic hand position adjustment function is activated once a minute for the
second hand and at 12:00 both for the AM and PM for the hour and minute hands.
This function works when the preliminary hand position is misaligned due to external
factors such as strong impact or magnetic influence. It does not work to adjust accuracy of
the watch or slight misalignment which may occur during the manufacturing process.
The automatic time adjustment function is unlikely to be activated due to low energy
stored in the watch or depending on the environment.
To immediately adjust the time, refer to the “How to adjust the time zone P. 14 ~ 16.”
The preliminary positions of the hour/minute hands can be manually adjusted.  Adjust the
preliminary position of the date, indicator hand, and hour/minute hands P.46 ~ 47
Adjusting the preliminary position of the date and indicator hand
Preliminary position
Since the preliminary position of the date and indicator hand is not
automatically adjusted, it must be adjusted manually.
When the watch is unable to display the precise time or date even when
it has successfully received GPS signals, the preliminary position may be
misaligned.
 Adjust the preliminary position of the date, indicator hand, and hour/minute hands P.46 ~ 47
45
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
Preliminary position of
this watch
The preliminary position of the
date is “1” (1st).
The preliminary position of the
indicator hand is between “E”
(low) and .
The preliminary position of the
hour/minute hands is “00:00 am.”
Adjust the preliminary position of the date, indicator hand, and hour/minute hands
1
Continue to press Button B and C
simultaneously (3 seconds), and then
release it when the second hand moves
to the 13-second position
2
The watch enters the mode to adjust
the preliminary position of the date.
The date moves, and stops at the
preliminary position.
Press Button B or C to
set the date to “1.”
Adjust the date so that the position
of “1” will locate at the center of
the window.
3
Continue to press Button A (2 seconds)
and release it when the second hand
moves to the 55-second position
The watch enters the mode to
adjust the preliminary position of
the indicator hand.
 If “1” is displayed, go to operation of 3.
Button B
Pressing
once
advances
the date
slightly
Press
simultaneously
for 3 seconds
Button C
Pressing
once
returns
the date
slightly
 Never pull the crown out.
 When the date is continuously stopped
for 1 minute or longer, the watch returns
to the time display mode.
When the watch has automatically
returned to the time display mode,
restart operation.
Press for
2 seconds
If the button is kept
pressed for two
seconds or longer,
the date will move
continuously.
Press the button again
to stop the date.
 During movement of the date, the
buttons cannot be operated.
 If no operation is performed for more than 1 minute or when Button A is pressed once, the
watch returns to the time display mode.
When the watch has returned to the time display mode, restart operation.
46
Continued on the
following page
CONTENTS
8
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
4
Press Button B or C to adjust the
indicator hand as shown in the figure
Adjust the indicator hand to the position
as shown in the figure.
The preliminary position of the indicator
hand is between “E” (low) and .
If the indicator hand points as shown in the
figure, go to operation of 5.
Slightly
moves the
hand
clockwise
5
Continue to press Button A (2 seconds)
and release it when the second hand
moves to the 0-second position.
The watch enters the mode to adjust
the preliminary position of the hour/
minute hands.
Button B once and then
6 Press
release it
The hour/minute hands move,
and stop at “00:00 am.”
If the watch displays the precise time, go to
operation of 7.
Press for
2 seconds
Button B
If the button is kept pressed
for 2 seconds or longer, the
hand will move continuously.
Press the button again to
stop the hand.
Slightly
moves the
hand
counterclockwise
The indicator hand makes one complete turn,
but this does not mean a failure.
If no operation is performed for more than 1 minute or when Button A is pressed once, the
watch returns to the time display mode.
When the watch has returned to the time display mode, restart operation.
47
operation is completed,
7 When
press Button A and release it
The mode to adjust the
preliminary position is
completed, and the second hand
and the hour/minute hands start
moving.
Button A
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
In case of an abnormal movement (resetting the built-in IC)
In the case that the watch
moves abnormally or that
the watch does not move at
1-second intervals even after
fully charging the battery,
perform the procedures from
1 to 9 to re-establish normal
function.
Reset the system (2 ~ 4)
2
3
Pull out the crown
to the second click
The second hand stops at the
13-second position.
When the buttons are released, the
second hand makes one complete
turn, and stops at the 0-second
position.
After that, the hour/minute hands
move and stops at 00:00.
The watch can be recovered to the initial
state by the system reset when trouble
occurs. (2 ~ 4)
After that, adjust the preliminary
position of the date and indicator hand
(5 ~ 0) and set the time (0) before use.
1 Unlock the crown
0
1
Continue to press Button A and C
simultaneously for 2 seconds, and
then release them
the hands stop at 00:00:00,
4 When
push the crown back in
The second hand moves from
00:00:00.
Push
back in
2
0 1 2
Press for
2 seconds
Pull out to
the second
click
Lock the crown.
 P.34
While pressing the crown in
Unlock the crown
Screw-lock type crown P.34
Press for
2 seconds
Screw
Unscrew
After the system reset, the time zone
is set to UTC/LON.
48
Continued on the
following page
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
Set the date to “1” (1st) (5, 6)
Set the indicator hand to “E” (7 ~ 9)
If the date is stopped continuously for 1 minute or longer, the
watch automatically returns to the time display mode. When the
watch has returned to the time display mode, restart operation.
5
Continue to press Button B and C simultaneously
(3 seconds) and release them when the second
hand moves to the 13-second position
The watch enters the mode to adjust the
preliminary position of the date.
6
Press Button B or C to
set the date to “1”
Adjust the date so that the position
of “1” will locate at the center of the
window.
7
Continue to press Button A (2 seconds),
and release it when the second hand
moves to the 55-second position
The watch enters the mode to adjust
the preliminary position of the
indicator hand.
If “1” is displayed, go to operation of 7.
Button B
Never pull the
crown out.
Pressing
once
advances
the date
slightly
Press for
3 seconds
simultaneously
Button C
Press for
2 seconds
If the button is kept
pressed for 2 seconds,
the date moves
continuously. Press
the button again to
stop the date.
Pressing
once
returns
the date
slightly
During movement of the date, the buttons cannot
be operated.
If no operation is performed for more than 1 minute or when Button A is
pressed once, the watch returns to the time display mode.
When the watch has returned to the time display mode, restart operation.
49
Continued on the
following page
CONTENTS
8
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
Set the time (0)
8
Press Button B or C to adjust the
indicator hand as shown in the figure
Adjust the indicator hand to the
position as shown in the figure.
If the indicator hand points as shown in the
figure, go to operation of 9.
Slightly
moves the
hand
clockwise
9
When operation is
completed, press Button A
and then release it
The mode to adjust the
preliminary position is completed,
and the second hand and hour/
minute hands start moving.
After operation of 1 to 9 is
completed, make sure to set the
time.
When you are in a place where GPS signals can be easily
received (P. 13), adjust the time zone.
How to adjust the time zone P. 14 ~ 16
If GPS signals are received after the system
reset, leap second data are also received.
 P. 30
Button A
When you are in a place where GPS signals cannot be received
1 Carry out manual time zone setting
 How to manually set the time zone P. 20
2 Manually set the time  How to manually set the time P. 43
3 Manually set the date  How to manually set the date P. 44
If the button is kept pressed
for 2 seconds, the hand
moves continuously.
Press the button again to
stop the hand.
Slightly
moves the
hand
counterclockwise
When the time and date are set, operation is completed.
The indicator hand makes one complete turn,
but this does not mean a failure.
If no operation is performed for more than 1 minute or when Button A is
pressed once, the watch returns to the time display mode.
When the watch has returned to the time display mode, restart operation.
10
Set the time by
receiving GPS signals
50
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
Troubleshooting
At trouble
The second hand moves
at 2-second intervals.
The second hand moves
at 5-second intervals.
Hand
Movement
Possible causes
Reference
pages
Solutions
The energy depletion forewarning function is activated. (P. 31)
If the second hand moves at 2 or 5-second intervals while you
wear the watch everyday, the watch is in a condition where
it cannot acquire sufficient light, for instance, the watch is
concealed under a long sleeve shirt.
Charge the watch sufficiently until the second hand
moves at 1-second intervals and the indicator hand
points to the “level position (middle)” or “F (full).”
level position
(middle)
Be careful not to conceal the watch under a sleeve, etc., while wearing it.
When taking off the watch, place it in as bright a location as possible.
P. 10
P. 11
The stopped second hand
pointing to the 15-second
position started operating.
The power save function 1 has been activated (P. 32)
When the watch has not been exposed to sufficient light
continuously, the power save function 1 to limit energy
consumption is automatically activated.
When the watch is exposed to light, the hand will rapidly advance and return to the current
time.
When the watch returns to the current time, use it as is. (This is not an abnormal movement.)
The stopped second hand
pointing to the 45-second
position started operating.
The power save function 2 has been activated (P. 32)
When the watch is not sufficiently charged for a certain period of
time, the power save function 2 is automatically activated.
1 Charge the watch until the indicator hand points to the “level position (middle)” or “F (full).”
2 After that, when the time is incorrect, adjust the time zone as necessary.
The watch hands advance
rapidly unless a button
is pressed. After the
rapid advancement is
completed, the watch
resumes its normal
1-second interval
movement.
The power save function has been activated. (P. 32)
The automatic hand position alignment function was activated.
When the hand positions deviate to display incorrect time as a
result of external influences, etc., the
watch automatically corrects the hand misalignment by the
automatic hand position alignment function.
No operation is needed (this is not an abnormal movement).
The second hand has
stopped at the 0-second or
5-second position
Automatic time adjustment is being performed (P. 23)
The indicator hand points to “1.”
It takes up to 1 minute to complete reception.
Use the watch with reference to the “Place where GPS signals can be easily received P. 13.”
P. 23
The second hand has
stopped between the
0-second to 18-second
positions.
The automatic leap second reception function
has been activated (P. 30)
The indicator hand has pointed to the right side
of “4+.”
It takes up to 18 minutes to complete reception.
Use the watch with reference to the “Place where GPS signals can be easily received P. 13.”
P. 30
51
—
P. 10
P. 11
P. 14 ~ 16
—
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
At trouble
Reference
pages
Solutions
The charging status has been
displayed as “E (low).” (P. 10)
Charge the watch sufficiently until the charging status is
displayed as the “level position (middle)” or “F (full).”
The in-flight mode (
(P. 19)
After relocation from a place under restriction on use of GPS signals (in an airplane, etc.),
reset the in-flight mode ( ).
P. 19
You are in a place where GPS signals cannot be received. (P. 13)
Receive GPS signals in a place where GPS signals can be easily received.
P. 13
The time zone that does not correspond to the region where you
are has been set.
Check the time zone setting.
If the time zone does not correspond to the region where you are, adjust the time zone.
• When you are in a place where GPS signals can be easily received  How to adjust the time
zone
• When you are in a place where GPS signals cannot be received  How to manually set the
time zone
Daylight Saving Time (DST) setting does not correspond to the
addition conditions of Daylight Saving Time (DST).
Check Daylight Saving Time (DST) setting.
P. 17
Daylight Saving Time (DST) setting does not correspond to the
addition conditions of Daylight Saving Time (DST).
Check Daylight Saving Time (DST) setting.
P. 17
The position of the hands is misaligned due to external factors.
The preliminary position of the hands is misaligned.
 Preliminary position P. 45 ~ 46
1 <Hour/minute hand misalignment> The automatic hand position adjustment function is
activated to automatically adjust the positions. Please use the watch as it is. The automatic
hand position alignment function is activated once a minute for the second hand and at
12:00 AM and PM for the hour and minute hands.
<Date misalignment> Since the preliminary position is not automatically adjusted,
manually adjust the position.
2 When misalignment of the hand is not adjusted, refer to the “In case of an abnormal
movement” to carry out operation.
3 When misalignment of the hand is not adjusted even with operation of 2, consult the
retailer from whom the watch was purchased.
The reception result is
displayed as “Y,” but the
time is gained or lost by
one to two seconds.
The automatic time adjustment function has not been activated
for a few days.
If the energy stored in the watch is insufficient, the automatic time adjustment function may be
activated once in 3 days.
P. 23
The automatic time
adjustment function is not
activated every day
Conditions to activate the automatic time adjustment function are
not prepared.
Sufficient energy is necessary to activate the automatic time adjustment function. The time
adjustment function is automatically activated by exposure to bright light.
P. 23
Reception is not started
even with operation of
time zone adjustment/
manual time adjustment
GPS signals cannot be
received even by carrying
out GPS signal reception
(The reception result is
displayed as “N.”)
GPS signal
reception
Possible causes
GPS signals have been
received successfully
(the reception result is
displayed as “Y,”) but
the time and date are
gained or lost (when the
reception result of time
adjustment is displayed)
The reception result is
displayed as “Y,” but
the time and date are
gained or lost (when
the reception result of
time zone adjustment is
displayed)
) has been set.
52
level position
(middle)
P. 11
P. 16
P. 14 ~ 15
P. 20
P. 46
P. 48
CONTENTS
8
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
At trouble
The position of the second
hand showing “reception
result” and “number of
acquired satellites from
which GPS signals are
received” is misaligned.
Misalignment
of time and
hands
The watch temporarily
gains or loses time.
The time is gained (lost)
1 hour
Possible causes
Solutions
Reference
pages
The preliminary position of the second hand is misaligned.
(This occurs when the position of the second hand is misaligned
due to external factors.)
 Preliminary position P. 45 ~ 46
1 The automatic hand position alignment function is activated to automatically adjust the
position. Please use the watch as it is. The automatic hand position alignment function is
activated once a minute for the second hand.
2 When misalignment of the hand is not adjusted, refer to the “In case of an abnormal
movement” to carry out operation.
3 When misalignment of the hand is not adjusted even with operation of 2, consult the
retailer from whom the watch was purchased.
The automatic time adjustment function has not been activated
for a few days. (P. 23)
If the energy stored in the watch is insufficient, the automatic time adjustment function may
be activated once in 3 days.
To adjust the time immediately, carry out “manual time adjustment.”
P. 23
P. 14 ~ 16
The watch received an incorrect time due to external factors
(erroneous reception).
1 Receive GPS signals in a place where GPS signals can be more easily received.
2 Adjust the time zone as necessary.
P. 13
P. 14 ~ 16
The watch is left in an extremely high or low temperature place
for a long time.
1 If the watch is returned to a normal temperature place, the accuracy will be recovered.
2 If the time is incorrect after that, manually adjust the time as necessary.
3 If the watch is not recovered, consult the retailer from whom the watch was purchased.
P. 14 ~ 16
Daylight Saving Time (DST) is ON (or OFF).
Check Daylight Saving Time (DST) setting.
53
P. 43
P. 48
P. 17
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
Solutions
Reference
pages
The amount of exposed light is too weak.
The time for charging the watch is not sufficient.
The time required for charging the watch depends entirely on the amount of exposed light the
watch receives.
Refer to“ Standard charging time” to charge the watch.
P. 11
The built-in IC of the watch has fallen into an unstable condition.
Refer to “In case of an abnormal movement” to reset the built-in IC.
P. 48
The second hand is
stopped even when the
watch is charged for
longer than the time
required to fully charge
the watch (P. 9).
The watch was not charged for a long time and has been
discharged completely.
Contact the retailer from whom the watch was purchased.
After successful reception,
the time is correct but the
date is incorrect
The preliminary position of the date is misaligned.
This occurs when the preliminary position of the date is
misaligned due to external factors or system reset.
Adjust the preliminary position of the date to the correct position “1” (1st).
P. 46
The sub-dial has been
adjusted to the dial, but
the time is incorrect.
The sub-dial is not provided with the preliminary position
adjustment function.
This occurs when the time is gained or lost due to external
factors.
Adjust the sub-dial.
P. 26
GPS signal reception has
been performed, but the
sub-dial does not display
the current time.
The time of the sub-dial is not changed even when the watch has
received GPS signals.
The sub-dial operates independently from the dial.
Manually adjust the sub-dial with reference to P. 26.
At trouble
Charging the
solar battery
Misalignment
of the date
Sub-dial
misalignment
The stopped watch
was exposed to an
adequate light for
longer than the time
required to fully charge
the watch, however,
it does not resume its
normal 1-second interval
movements.
Possible causes
54
—
—
TROUBLESHOOTING
ASTRON 7X52 GPS SOLAR
CONTENTS
8
At trouble
Indicator hand
misalignment
The position of the hand
showing the reception
type, charging status, inflight mode ( ), and DST
is misaligned
The crown or buttons
cannot be operated.
Possible causes
Solutions
The automatic leap second reception
function has been activated.
(The second hand is stopped between
the 0-second to 18-second positions.)
It takes up to 18 minutes to complete the leap second reception.
Use the watch with reference to the “Place where GPS signals can be easily received P. 13.”
The preliminary position of the indicator hand is misaligned.
This occurs when the preliminary position of the indicator hand
is misaligned due to external factors or system reset.
Adjust the preliminary position of the indicator hand to the correct position.
The stored electric power is running short
Sufficiently charge the watch until it starts moving at 1-second intervals.
Date is moving right after a setting is carried out by the crown or
button operation.
Wait without doing anything.
After the date stops, the crown and buttons can be operated.
—
When the crown is pulled out
1 Push the crown back in.
2 The second hand will start to move within 9 minutes.
3 After that, restart operation.
—
When the crown is not pulled out
1 Press Button A.
2 The second hand will start to move within 2 minutes.
3 After that, restart operation.
—
Contact the retailer from whom the watch was purchased.
—
Operation
You get lost in the middle
of the operation.
Other
trouble
Blur on the dial glass
persists.
Reference
pages
P. 30
P. 46 ~ 47
P. 11
—
—
—
Small amount of water has got inside the watch due to
deterioration of the gasket, etc.
55
FUNCTION LIST/SPECIFICATIONS
ASTRON 7X52 GPS SOLAR
CONTENTS
9
Index
Functions to adjust the time
Solar Charging Function… ………………… A solar cell underneath the dial converts any form
 P. 11
of light into electrical energy to power the watch
and the power is stored in a secondary battery.
Once fully charged, the watch continues to run for
approximately 6 months.
GPS signal reception  P. 29
Time zone adjustment function…………… Identifies the time zone corresponding to the
 P. 14 ~ 16
region where you are by button operation by
receiving GPS signals from GPS satellites to
display the precise current time.
Use this function when you travel to a region
corresponding to another time zone.
Charging status display function… ……… Roughly displays the energy charged in the watch.
 P. 10
Also shows whether the watch is able to receive
GPS signals.
Manual time adjustment function………… Displays the precise current time of the currently
 P. 21 ~ 22
set time zone by receiving GPS signals from GPS
satellites.
Use this function to adjust the time to the precise
time during normal use.
Power Save Function………………………… The Power Save mode can be activated in order
 P. 32
to reduce unnecessary energy consumption when
the watch is left without an adequate light source.
Automatic time adjustment function… … Judges inside the watch the timing suitable for
 P. 23
GPS signal reception from GPS satellites and
automatically starts reception.
Displays the precise current time of the currently
set time zone.
Manual time zone setting…………………… The time zone can be changed manually in a place
 P. 20
where the time zone adjustment is not allowed.
Daylight Saving Time (DST) setting… …… Daylight Saving Time (DST) can be set manually.
 P. 17 ~ 18
56
FUNCTION LIST/SPECIFICATIONS
ASTRON 7X52 GPS SOLAR
CONTENTS
9
Function for reception
SPECIFICATIONS
In-flight mode ( )… ………………………… Function to prevent the GPS signal reception
function from working. Set this mode when
 P. 19
boarding an airplane, etc.
1. Basic function………………………… Main-dial; three hands (hour/minute/second hands),
date display, indicator hand, sub-dial; two hands (hour/
minute hands)
Satellites acquisition status display function… … Displays by the second hand the number of GPS
 P. 15
satellites from which GPS signals are received
during GPS signal reception.
2. Frequency of crystal oscillator… … 32,768 Hz (Hz = Hertz ... Cycles per second)
Reception result display function… ……… Displays the latest reception result (success/
 P. 24
failure).
3. Loss/gain (monthly rate)…………… Loss / gain ±15 seconds on a monthly rate (Except the
case when the watch is used without an automatic time
setting by receiving GPS signal and when it is worn on
the wrist within a normal temperature range between
5°C and 35°C ).
Time zone setting check function………… Displays the currently set time zone
 P. 16
4. Operational temperature range…… Between −10°C and +60°C
5. Driving system… …………………… Step motor (hour/minute/second hands of main-dial,
date, indicator hand, hour/minute hands of sub-dial)
Other functions
6. Power source… ……………………… Secondary battery, 1 piece
Dual time display… ………………………… Displays at the sub-dial located on the 6:00
 P. 25
position (in 24-hour display) the time of a region
different from the time of the dial.
7. Duration of operation… …………… Approximately 6 months (Fully charged, and the Power
Save is not activated).
 If the Power Save is activated after it is fully charged,
the watch
continues to run for approximately 2 years at maximum.
Automatic hand position alignment function… … Automatically corrects misalignment when the
 P. 52
hands are misaligned due to external factors such
as magnetic influence.
8. GPS signal reception function… … Time zone adjustment, manual time adjustment,
automatic time adjustment
Automatic leap second reception function…… Automatically receives leap second data when
 P. 30
leap second data reception is necessary.
9. IC (Integrated Circuit)… …………… Oscillator, frequency divider and driving circuit C-MOSIC, 4 pieces
The specifications are subject to change without prior notice for product improvement.
Declaration of Conformity
57
Copyright ©2012 by SEIKO WATCH CORPORATION
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