Seiko ASTRON Assembly instructions

8X53
HANDY MANUAL
Printed in Japan
BSN 8X53-A1604
<
English
>

1 2
For details, please read the
“8X53 (GPS Solar) Complete User Guide”
(http://www.seikowatches.com/support/ib/index.html).
Please carefully read the
instructions in this Complete User
Guide before using the watch.
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 perform 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 corrosion.
1. Features���������������3
2. Names of the parts ���������5
3. Check the charging status ������7
4. Time zone �������������� 9
5. Time zone display and list of
time zones around the world���� 11
6. Time Zone Adjustment������� 13
7. Manual time zone selection of the
main-dial ������������� 15
8. Manual time zone selection of the
sub-dial �������������� 17
9. DST setting of the main-dial ���� 19
10. DST setting of the sub-dial����� 21
11. How to manually adjust the time �� 23
12. When boarding (in-flight mode ( ))� 25
13. Leap second (Automatic leap second
reception function) �������� 27
14. Reception result display ������ 29
15. How to check when the time zone
information was configured for your
watch ��������������� 31
CONTENTS

3 4
GPS signal reception
Features
This is a GPS solar watch.
Standard Charging Time
This watch can be set to the precise
local time by just one button
operation

anywhere in the world.
 DST (Daylight Saving Time) can be set manually.
This watch quickly adjusts the time by
receiving GPS signals
from GPS satellites.
This watch responds to
a total of 40 time zones
around the world.
When the region or time
zone where the watch is
used is changed, please
carry out operation of
“time zone adjustment.”
1
GPS signal reception consumes a lot of energy. It is necessary to charge the watch by exposing it to light so
that the indicator hand points to the “middle” or “full” position. (If the charging status is displayed as “low,” the
reception will not start even with manual GPS signal reception.)
The figures of “Time required for charging the watch to start moving at one- second 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.
Illumination
lx (LUX)
Light
source
Condition
(Example)
From the state where the watch is
stopped (not charged)
In the state where the hand
moves (the watch is charged)
To fully charged
To one-second interval
movement is secured
To move for one day
700 Fluorescent light General offices － － 3.5 hours
3,000 Fluorescent light 30W 20cm 420 hours 12 hours 1 hours
10,000
Fluorescent light Sunlight Cloudy day 30W 5cm 11 5 hours 4 hours 15 minutes
100,000 Sunlight
Sunny day (Under the direct sunlight on a summer day)
50 hours 1.5 hours 10 minutes
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.
Solar charging Function
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.
Automatic time adjustment function
This watch automatically adjusts the time in
accordance with action pat terns 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.
This watch is
unable to receive
GPS signals
when the energy
stored in the
watch is low.

5 6
Names of the parts
2
Crown
Minute hand
Sub-dial
AM/PM hand
Date
Button B
Hour hand
Button A
Second hand
Indicator hand
Sub-dial
(12-hour system)
Day hand (day of the week)

Position of each display may differ depending on the
model (design).

7 8
Check the charging status
Indicator
display
Charging
status Solution
full Reception is
allowed.
middle Reception is
allowed.
Indicator display Movement of second hand Charging status Solution
1-second
interval
movement
low
The watch
is unable to
receive GPS
signals, but
has energy
to operate.
Charge the watch at least until
the indicator hand points to
“middle” so that the watch is
able to receive GPS signals.
2-second
interval
movement
The watch
is unable to
receive GPS
signals, and
does not
have energy
to operate.
(The energy
depletion
forewarning
function is
activated.)
Continue to charge the watch
at least until the indicator hand
points to “middle” so that the
watch is able to continuously
operate and receive GPS signals.
5-second
interval
movement
The charging status is
not displayed for the
in-flight mode ( ).
Reset the in-flight mode ( ) as
long as possible.
When the indicator hand points
to “low,” charge the watch.
3
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. It is necessary to regularly charge the watch by exposing it to light.
Reception is
allowed
Reception is
not allowed

910
Time zone
4
Time zone
Based on Coordinated UniversalTime (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 40 zones as of March 2015.
Further, DST (Daylight SavingTime) is individually
adopted in countries and regions.
DST (Daylight SavingTime)
Depending on the area, DST (Daylight Saving Time) is
individually set.
Daylight SavingTime, or summer time, is a system
to lengthen daylight time by advancing 1 hour when
daylight time is longer during 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 varies depending on
the country.
Daylight SavingTime is subject to change due to circumstances
of the country or region.
Coordinated UniversalTime
(UTC)
UTC is the universal standard time coordinated
through an international agreement. UTC is the
primary time standard for recording time around the
world. The time obtained by adding a leap second to
the “International AtomicTime (TAI)” is determined
based on the atomic clock around the world. It is
coordinated in order to compensate for deviations
from universal time (UT) which is astronomically
determined by the UTC.

11 12
Time zone display and list of time zones around the world
5
The displays of city code and the time difference from
UTC are Subject to change depending on model.
“·” between figures of the display of time difference
shows that there is a time zone in that place.
Display of
time difference
The following list shows 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.
DST (Daylight SavingTime) is used 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 SavingTime (SummerTime) is in effect.
This watch corresponds to DST in the Lord Howe Island time zone.
The time zone of each region and DST (Daylight SavingTime) are as of
March 2015.
Display of time zone
Representative city names…28 cities
among the total of 40 time zones
around the world
Time difference…+14 hours ~ –12 hours
City
code
Display of time
difference
City name UTC
± hours
BJS 8 Beijing +8
— • Eucla +8.75
TYO 9 Tokyo +9
ADL • Adelaide +9.5
SYD 10 Sydney +10
— • 
Lord Howe
Island
+10.5
NOU 11 Nouméa + 11
— • Norfolk
Island +11.5
WLG 12 Wellington +12
— • 
Chatham
Islands +12.75
TBU 13 Nuku’alofa +13
CXI 14 Kiritimati +14
—–12 Baker Island –12
MDY – 11
Midway
islands
–11
City
code
Display of time
difference
City name UTC
± hours
LON UTC London 0
PAR 1
Paris/Berlin
+1
CAI 2 Cairo +2
JED 3 Jeddah +3
— • Tehran +3.5
DXB 4 Dubai +4
— • Kabul +4.5
KHI 5 Karachi +5
DEL • Delhi +5.5
— • Kathmandu +5.75
DAC 6 Dhaka +6
— • Yangon +6.5
BKK 7 Bangkok +7
City
code
Display of time
difference
City name UTC
± hours
HNL –10 Honolulu –10
— •
Marquesas
Islands
–9.5
ANC –9 Anchorage –9
LAX –8 Los Angeles –8
DEN –7 Denver –7
CHI –6 Chicago –6
NYC –5 NewYork –5
— • Caracas –4.5
SDQ –4 Santo
Domingo –4
— • St. John’s –3.5
RIO –3  Rio de Janeiro –3
FEN –2 Fernando de
Noronha –2
PDL –1 Azores –1

13 14
Time Zone Adjustment
Go to a place where
GPS signals can be
easily received
1
Move to the outdoors
under an open sky
with good visibility.
The time zone where you are is localized to adjust the watch to the precise current time
by just one button operationanywhere in the world.
DST (Daylight Saving Time) can be set manually.
6
How to adjust the time zone
Time zone adjustment
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.
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.
Continue to press Button A (6 seconds),
and then release it when the second hand
moves to the 30-second position.
2
Although the second hand moves to the
0-second position 3 seconds after pressing
Button A, continue to press it.
When the second hand has reached
the 30-second position, reception is
started.
The indicator hand points to “4+.”
While the indicator hand points to “low” or ,
reception is not started even with operation
for reception.
When the hand points to “low,” charge the
watch by exposing it to light.
Check whether the watch is able/unable to
receive GPS signals
When the hand points to , reset the in-
flight mode ( ).
Press for
6 seconds
3Direct the watch face upward and
wait
<
Display during reception (= satellites
acquisition status)
>
The second hand indicates ease of
receiving (= number of GPS satellites
from which GPS signals are received).
Even when the hand points to 4
units or more, reception may not be
allowed.
 Please note that it may be difficult to receive
GPS signals while you are in motion.
To cancel the
reception, press
Button B.
It takes a maximum
of 2 minutes to
complete reception.
It depends on the
receiving conditions.
Second hand
position
25-second
Number of
satellites
5 units
The larger
the number
of acquired
satellites there
are, the easier
it is to receive
GPS signals.
B
P
C
JJY
May receive
C
a
n
n
o
t
r
e
c
e
i
v
e
3 units
4 units
5 units
6 units
・
・
・
・
・
・
2 units
0 units
E
a
s
y
t
o
r
e
c
e
i
v
e
Press
When the second hand
points to “Y” or “N,”
reception is completed.
4
During movement of the
date, the buttons cannot be
operated.
Manually set Daylight Saving
Time (DST).
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
display
Y: Successful N: Failed
Display
Check that the reception
is successful after the
watch returns to the
time display mode.

0 1 2
Pull out
to the
1st click
0 1 2
Push
back in
15 16
Manual time zone selection of the main-dial
In places where the time zone cannot be adjusted, the time zone can be set manually.
Pull out the crown to the first
click
1
The second hand moves
to display the currently set
time zone.
Push the crown back in
3
The second hand returns
to the time display mode.
The indicator hand returns
to the display of charging
status.
Turn the crown and set the second hand to the time zone of the destination
2
When the crown is turned,
the second hand moves to
the next zone.
During movement of the
date, the buttons and crown
cannot be operated.
How to manually set the time zone
Turn the crown
clockwise to
advance 1 time
zone.
Turn the
crown counter
clockwise to
set back 1 time
zone.
< Display of the indicator
hand >
Displays ON/OFF setting of
DST (Daylight SavingTime).
7
Manual time zone selection
DST OFF ON
Display
Hand
position •DST

17 18
8
Manual time zone selection of the sub-dial
Adjust the sub-dial by selecting the time of the time zone.
The sub-dial cannot be adjusted to a time outside the time zone.
Manual time zone selection of the sub-dial
How to select the manual time zone of the sub-dial
Pull out the crown to the first
click
1
The second hand moves
to display the currently set
time zone.
0 1 2
Pull out
to the
1st click
Push the crown back in
4
The second hand returns
to the time display mode.
The indicator hand returns
to the display of charging
status.
During movement of the
date, the buttons and crown
cannot be operated.
0 1 2
Push
back in
Press Button B
2
The second hand moves
to display the currently set
time zone of the sub-dial.
The day hand points to ∆.
0 1 2
Press
Turn the crown and set the second
hand to the time zone of the
destination
3
When the crown is turned,
the second hand moves to
the next zone.
Turn the crown
clockwise to
advance 1 time
zone.
Turn the
crown counter
clockwise to
set back 1 time
zone.
< Display of the indicator
hand >
Displays ON/OFF setting of
DST (Daylight SavingTime).
DST OFF ON
Display
Hand
position •DST