Citizen Eco-Drive ES4 Series User manual

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* Notice
All repairs performed on this watch are to be performed
at the CITIZEN.
When desiring to have your watch repaired or inspected,
please contact the Citizen Service Center.

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English
<This radio controlled watch receives standard radio signals broadcast from
Germany>
This is a radio controlled watch; it has the Automatic reception function and On demand
reception function. Every day at 3 a.m. or 4 a.m., the watch automatically receives a
radio signal and adjusts the time (Automatic reception), or the signal can be received and
the time adjusted at any desired time (On demand reception).
The radio controlled watch has no effect on the human body or medical equipment.
<Fully charge your watch before use by exposing it to sufficient light>
The second hand will move at 2-second intervals when the watch is insufficiently
charged. Charge your watch as indicated in “Guide to Charging Time” (p. 40).
• Charge the watch in direct sunlight for a long
time once a month.

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[Part Names]
Hour hand
Second hand
Button (B)
Minute hand
Crown
Button (A)
Reception status: OK Receiving: RX
* The illustrations shown in this manual may differ from the actual watch you have purchased.
Reception status: NO
Reception status
Summer time setting

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• Depending on the particular watch model, some indicate the reception status and
daylight saving setting with the long side of the second hand, while others indicate
with the short side of the second hand.
* Depending on the particular watch model,
some do not have an “S” indication.
Reception status
Long side of the hand
Short side of the hand
Long side of the hand
Short side of the hand
Summer time setting

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Table of Contents
1. Your Watch .................................................................................................. 8
2. Operating the Crown .................................................................................. 9
3. Before Use ................................................................................................. 10
• Checking the Reference Position ............................................................ 12
4. Functions List ............................................................................................ 14
Radio Signal Reception
5. For Best Reception .................................................................................... 16
6. Poor Reception Areas ................................................................................ 17
7. Receiving the Radio Signals ...................................................................... 18
• Automatic Reception .............................................................................. 18
• On Demand Reception ............................................................................ 18
• Recovery Automatic Reception ............................................................... 19
• Confirming the Reception Status ............................................................ 20
• Reception Area Guidelines ...................................................................... 22
8. Setting the Summer Time ......................................................................... 24

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Setting the Time Manually
9. Setting the Time ........................................................................................ 26
10. Correcting the Time Difference ................................................................. 28
11. Correcting the Reference Position ............................................................ 30
Eco-Drive
12. Solar Power Function ................................................................................ 32
13. Characteristics of the Eco-Drive Watch ..................................................... 34
• Power Saving Function ........................................................................... 36
• Insufficient Charge Warning Function .................................................... 38
• Overcharging Prevention Function ......................................................... 39
• Guide to Charging Time .......................................................................... 40
• Handling Your Eco-Drive Watch .............................................................. 42
Troubleshooting ............................................................................................. 44
Precautions ..................................................................................................... 48
14. Specifications ........................................................................................... 54

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1. Your Watch
◎Automatic reception function: Every morning at 3 a.m. and 4 a.m. the watch will
automatically receive a signal and adjust the time.
However, if reception is successful at 3 a.m., automatic reception will not be
performed at 4 a.m.
◎On demand reception function: The radio signals can be received at any time of
the day to adjust the time.
◎Eco-Drive function: This solar powered Eco-Drive watch is equipped with a solar
power function for powering the watch by converting light energy into electric
energy. The watch incorporates a power saving function that reduces the electrical
power consumption when the watch face is not exposed to light.
◎Time zone adjustment function: The watch incorporates a convenient time zone
adjustment function (±27 hours).
A simple method is available for changing to the local time if you are going to an area
in a different time zone.
◎Daylight saving function: Summer time can easily be set.