Seiko 5K25 User manual

You are now the proud owner of a SEIKO Analogue Quartz Watch
Cal. 5K25. For best results, please read the instructions in this booklet
carefully before using your SEIKO Analogue Quartz Watch. Please
keep this manual handy for ready reference.
Usted es ahora un honrado poseedor del reloj SEIKO analógico de cuarzo
Cal. 5K25. Para obtener de él los mejores resultados, lea las instrucciones
del presente folleto con cuidado antes del uso de su reloj SEIKO
analógico de cuarzo. Guarde este manual para fácil referencia.

2
English
✩ For the care of your watch, see “TO PRESERVE THE QUALITY OF YOUR
WATCH” in the attached Limited Warranty and Instruction Booklet.
ENGLISH
CONTENTS
Page
FEATURES .................................................................................................................. 3
DISPLAY AND CROWN .............................................................................................. 4
HOW TO CHARGE AND START THE WATCH ........................................................... 5
ENERGY DEPLETION FOREWARNING FUNCTION ................................................... 7
NOTE ON POWER SUPPLY ....................................................................................... 7
TIME/CALENDAR SETTING ........................................................................................ 8
NOTES FOR USING THE WATCH .............................................................................. 9
SPECIFICATIONS........................................................................................................ 11

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English
CAL. 5K25
FEATURES
Time/calendar
● Three hands and date
Energy depletion forewarning function
● Second hand starts moving at 2-second
intervals to indicate that the watch needs
recharging.
Solar cell
● Converts light energy into electrical energy,
thus powering the watch.
Rechargeable battery
● Keeps the watch operating for 6 months after
full charge.
● No need for battery change
Instant-start function
● Even when the watch is left uncharged and
the rechargeable battery is completely
drained, the watch starts operating in a few
seconds once exposed to light.

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English
2
Hour hand Minute hand
a b c
Crown
✩ The solar cell is installed under the dial.
DISPLAY AND CROWN
a: Normal position b: First click c: Second click
Second hand
Date

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English
HOW TO CHARGE AND START THE WATCH
1
●When you start the watch or when the energy in the rechargeable battery is reduced
to an extremely low level, charge it sufficiently by exposing the watch to light.
●Instant-start function: When the watch is exposed to sunlight or strong artificial
light (of more than 1,000 lux), it will start operating immediately
with the second hand moving at 2-second intervals.
TO CHARGE THE WATCH
1Expose the watch
to sunlight or
strong artificial
light.
2Keep the watch
exposed to the light
until the second
hand moves at 1-
second intervals.
3Set the correct date
and time before
wearing the watch.
* See “CHARGING TIME
GUIDELINES” on page 6.
* When the watch has
stopped operating, the
second hand will start
moving at 2-second
intervals.

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English
CHARGING TIME GUIDELINES
Time required (approx.)
✩
60-watt incandescent
light
Distance of 60 cm
(2 ft.)
Illumination
(lux) CBA
Light source Environment
500 250 hours 15 hours 60 minutes
700 Fluorescent light Office, overhead 175 hours 11 hours 50 minutes
1,000
30-watt fluorescent
light
Distance of 70 cm
(2 ft. 4 in.) 120 hours 30 minutes
3,000
30-watt fluorescent
light
Distance of 20 cm
(8 in.) 10 minutes
5,000
30-watt fluorescent
light
Distance of 12 cm
(5 in.) 80 minutes
10,000
30-watt fluorescent
light
Distance of 3 cm
(1 in.) 30 minutes
10,000 Sun Cloudy weather 30 minutes
100,000 Sun Fair weather
A: for full charge B: for 1-second intervals C: to maintain 1-day usage
●
The above table provides only a general guideline.
● When the watch is fully charged, it will keep operating for approximately 6 months.
3 hours
40 hours
22 hours
10 hours
10 hours
6 hours
2 hours
8 minutes
6 minutes
3 minutes
3 minutes
1 minute

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English
✩ The values in column B represent the charging times required until the second hand moves constantly at
1-second intervals after the watch starts operating with the second hand moving at 2-second intervals. If
the watch is not charged for the time specified in the column, the second hand may temporarily move at
1-second intervals. However, as it will soon resume moving at 2-second intervals, you should charge the
watch for more than the specified period.
ENERGY DEPLETION FOREWARNING FUNCTION
●When the energy stored in the rechargeable battery is reduced to an extremely low
level, the second hand starts moving at 2-second intervals instead of the normal 1-
second intervals.
●In that case, recharge the watch as soon as possible by exposing it to light. Otherwise,
the watch may stop operating in about 3 days.
●Wear the watch so that it is not covered by your clothes.
●When the watch is not in use, leave it in a bright place as long as possible.
TO PREVENT THE ENERGY DEPLETION
●This watch is provided with a rechargeable battery. Unlike conventional battery-
powered watches, therefore, battery replacement is not necessary.
●The solar cell is an energy source that has less adverse effect on the natural
environment than conventional batteries.
NOTE ON POWER SUPPLY

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English
TIME/CALENDAR SETTING
1
Set the previous
day’s date.
Turn the hands
until the desired
date appears.
2
Set the hands to
the desired time.
3
Push back the
crown complete-
ly.
4
➠➠
1
3
2
➠
4
a b c
2

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English
NOTES FOR USING THE WATCH
HOW TO CHARGE AND START THE WATCH
CAUTION
Caution for charging
●When charging the watch, do not place it too close to a photoflash bulb, spotlight, incandescent
light or other light sources as the watch temperature may become extremely high, causing
damage to the parts inside the watch.
●When exposing the watch to sunlight to charge it, do not leave it on the dashboard of a car, etc.
for a long time, as the watch temperature may become extremely high.
●While charging the watch, make sure the watch temperature does not exceed 60 C.
●When the instant-start function is activated by exposing the watch to light, the second hand starts moving
at 2-second intervals immediately, but the energy stored in the rechargeable battery is not sufficient. If
the watch is turned away from the light source, it may stop operating. Therefore, please continue to
charge the watch.
●It is not necessary to charge the watch fully. It is important, however, to charge the watch sufficiently,
especially in case of initial charge.
CAUTION
●Never insert a conventional silver oxide battery in your watch as it may explode, generate an intense
heat or catch fire. The watch is so designed that even if a conventional battery is installed in the
watch, the watch will not operate.
NOTE ON POWER SUPPLY

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English
TIME/CALENDER SETTING
●Do not set the date between 9:00 p.m. and 1:00 a.m. Otherwise, it may not change properly.
If it is necessary to set the date during that time period, first change the time to any time outside it, set
the date and then reset the correct time.
●To set the exact time, pull out the crown to the second click when the second hand is at the 12 o’clock
position and push it back in to the normal position in accordance with a time signal.
●When setting the hour hand, check that AM/PM is correctly set.
The watch is so designed that the date changes once in 24 hours. Turn the hands past the 12 o’clock
marker to determine whether the watch is set for the A.M. or P.M. period. If the date changes, the time
is set for the A.M. period. If the date does not change, the time is set for the P.M. period.
●When setting the minute hand, first advance it 4 to 5 minutes ahead of the desired time and then turn it
back to the exact minute.
●It is necessary to adjust the date at the end of February and 30-day months.
●Please set the time and calendar after the second hand starts moving at one-second intervals.

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SPECIFICATIONS
1 Frequency of crystal oscillator .......................... 32,768 Hz (Hz = Hertz … Cycles per second)
2 Loss/gain (Monthly rate) ................................... Less than 15 seconds at normal temperature range (5
C ~ 35 C) (41 F ~ 95 F)
3 Operational temperature range ......................... –10 C ~ +60 C (14 F ~ 140 F)
4 Driving system .................................................. Step motor
5 Power supply .................................................... Titanium-lithium ion rechargeable battery
6 Duration of life
Full charge ..................................................... Approx. 6 months
2-second interval operation ............................ Approx. 3 days
7 Additional function ............................................ Instant-start function, energy depletion forewarning
function and overcharge prevention function
8 IC (Integrated Circuit) ........................................ C-MOS-IC, 1 piece
* The specifications are subject to change without prior notice for product improvement.