Citizen H57 User Manual
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CONTENTS
1. Features ..................................................................................................................... 3
2. Before Using ............................................................................................................. 4
3. Names of Components ............................................................................................. 5
4. Functions Unique to Solar-Powered Watches ....................................................... 6
• Insufficient Charge Warning Feature
• Quick Start Feature
• When Watch has Stopped due to Insufficient Charging
• Over Charge Prevention Feature
5. General Reference for Charging Times ............................................................... 11
6. Solar-Powered Watch Handling Precautions ...................................................... 12
• Try to keep the watch charged at all times
7. Replacing the Secondary Battery ......................................................................... 15
8. Setting the Time and Date ..................................................................................... 16
• Setting the Time
• Setting the Date
9. Using the Chronograph ......................................................................................... 19
10. Zeroing the Chronograph Second Hand .............................................................. 21
11. Using the Tachymeter (When Provided) ............................................................. 23
12. Precautions ............................................................................................................. 24
13. Specifications .......................................................................................................... 30
1. Features
This watch is a solar-powered watch that contains a solar cell in its face that drives the
watch by converting light energy into electrical energy. It is also equipped with
numerous functions including a 24 hour display and a chronograph function capable of
timing for up to 30 minutes in 1 second units.
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English
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2. Before Using
This watch is a solar-powered watch. Please fully charge the watch before using by
exposing it to light by referring to “5. General Reference for Charging Times”.
A secondary battery is used in this watch to store electrical energy. This secondary
battery is a clean energy battery that does not contain mercury or other toxic substances.
Once fully charged, the watch will continue to run for about 5 months without additional
charging.
<Proper Use of this Watch>
To use this watch comfortably, make sure to charge it before it stops running
completely. Since there is no risk of overcharging no matter how much the watch is
charged (Over Charge Prevention Feature), it is recommended that the watch be charged
every day.
3. Names of Components
Chronograph
second hand
Hour hand
Chronograph
minute hand
Date
Button (B)
Crown
24 hour hand
Button (A)
Minute hand
The design may vary depending on the model.
Second hand
When the watch becomes
insufficiently charged, the watch
display changes as shown below.
When the watch has changed from
normal hand movement to the
insufficient charge warning
feature, this indicates that that the
watch is insufficiently charged.
Allow light to shine on the solar
cell until the watch returns to 1-second
interval movement. Even after the watch has
returned to 1-second interval movement,
sufficiently charge the watch by exposing it to
light by referring to “5. General Reference for
Charging Times” to ensure that the watch is
used comfortably.
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4. Functions Unique to Solar-Powered Watches
[Normal Time Display]
[Insufficient Charge Warning Display]
The second hand switches from 1-second interval
movement to 2-second interval movement
[Stopped]
All of the hands
stop moving
When the watch
becomes insufficiently
charged as a result of
not being exposed to
light
If the watch is
continued to be used
without charging
The second hand begins 2-second interval movement when the watch is charged by
allowing light to shine on the solar cell. However, since the watch has stopped as a result
of being insufficiently charged, the time is incorrect. Sufficiently charge the watch until the
second hand begins 1-second interval movement and then reset the time before using.
When the watch is
charged by exposing to
light
2-second interval
movement continues
if the watch is
insufficiently charged
2 seconds
2 seconds
[Insufficient Charge Warning Feature]
Switches from 1-second interval movement (normal movement) to 2-second interval
movement
When the capacity of the secondary battery becomes low
as a result of light not shining on the solar cell, the
second hand switches from 1-second interval movement
(normal movement) to 2-second interval movement.
Although the watch continues to run normally at this
time, the watch ends up stopping if it remains
insufficiently charged for about 5 days after the start of
2-second interval movement. Sufficiently charge the
watch by exposing to light so that the second hand
returns to 1-second interval movement.
Notes:
• When chronograph timing is in progress, timing is interrupted and the chronograph
second hand is reset to the 0 seconds position.
• The chronograph minute hand stops at any arbitrary position. Press button (B) to
return to the 0 minutes position.
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[Quick Start Feature]
When light (approx. 500 lx) shines on the solar cell after the watch has stopped as a
result of being insufficiently charged, the second hand begins 2-second interval
movement and the watch starts to run after about 10 seconds (the time until the watch
starts to run varies according to the model). However, please note that the watch will
end up stopping again if the solar cell is blocked from the light since the watch will
again become insufficiently charged.
[When Watch has Stopped due to Insufficient Charging]
When the capacity of the secondary battery has been depleted as a result of light not
shining on the solar cell, the watch becomes insufficiently charged and stops. When
light shines on the solar cell, the Quick Start Feature is activated and the second hand
begins 2-second interval movement. Sufficiently charge the watch by exposing to light
until the second hand returns to 1-second interval movement.
Note:
• Even though the watch starts to run, since the watch has previously stopped as a
result of being insufficiently charged, the time is incorrect. Reset the time before
using the watch.
2 seconds
2 seconds
5. General Reference for Charging Times
The time required for charging varies according to the model of the watch (color of the
dial, etc.). The following times are shown below to serve only as a reference.
* Charging time refers to the amount of time the watch is continuously exposed to light.
Illuminance
(lux)
500
Environment
Inside an ordinary office
Charging time
3 hours 25 hours
Approx. charging
time from the
stopped state until
1-second interval
movement
Approx. charging
time from the
stopped state until
fully charged
-----
1,000
60-70 cm (24-28 in) under a
fluorescent lamp (30 W)
1.5 hours 12 hours
-----
3,000
20 cm (8 in) under a
fluorescent lamp (30 W)
30 minutes 4.5 hours 80 hours
10,000
Outdoors, cloudy weather
9 minutes 2 hours 25 hours
100,000
Outdoors, summer, under
direct sunlight
3 minutes 45 minutes 11 hours
Approx. charging
time for 1 day of
operation
Full charging time: Time required for charging the watch from the stopped state to fully charged.
Charging time for 1 day of operation: Time required for charging the watch to run for 1 day at 1-second
interval movement.
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[Over Charge Prevention Feature]
When the secondary battery becomes fully charged as result of light shining into the
watch dial (solar cell), the over charge prevention feature is activated automatically to
prevent the battery from being charged further. This prevents the performance of the
solar cell and secondary battery from deteriorating no matter how much the watch is
charged, and lets you expose the watch to light without worrying about overcharging.
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