Citizen BTOSeries User manual

1
English
The date window—
large and highly visible
The calendar—no date correction
at the end of months (→page 13)
Solar-powered and no battery
replacement (→page 9)
Features

2
Table of contents
Part names and their main functions .............................................................. 4
How to use the screw down crown ...................................................................... 5
When leaving the watch unused for an extended period of time .................... 5
Charging the battery .......................................................................................... 6
Charging the battery .............................................................................................. 6
When the battery becomes short of power
—Insufficient charge warning function ........................................................... 7
Charging time......................................................................................................... 8
After the battery is fully charged
—Overcharge prevention function................................................................... 9
Eco-Drive ................................................................................................................ 9
Setting the time ................................................................................................. 10
Checking the date, month, and year ............................................................. 12
Perpetual calendar................................................................................................ 13
Setting the year, month, and date ................................................................. 14
Precautions......................................................................................................... 22

3
English
• The second hand moves only once every two seconds.
• All hands stop moving.
• The figures are not displayed upright.
• The date is wrong.
• The date changes to the following day at around noon.
• The watch does not work properly.
• The watch does not move even if the battery is fully charged.
Troubleshooting..............................................................................................30
Checking and correcting the reference position......................................... 32
Resetting the watch .......................................................................................... 36
Maintenance....................................................................................................... 38
Specifications ..................................................................................................... 39

4
Button A:
For setting the date etc.
Part names and their main functions
The illustrations in this instruction manual may differ from the actual appearance of your watch.
Hour hand
Minute hand
Button B:
For setting the
calendar-related functions
Crown:
For setting the time, checking
the date, etc.
Press HERE.
Example of a button
Date
24-hour hand:
Goes around once
a day
Second hand

5
English
7How to use the screw down crown
To release the crown
7When leaving the watch unused for an extended period of time
Pull out the crown to position .
All hands stop moving and the battery power is
saved.
• The date will change to the following day every
24 hours once you have pulled out the crown to
position .
Turn the crown to the left until it pops out slightly.
To lock again
Tighten the crown completely by pressing and turning
it to right.

6
Charging the battery
7Charging the battery
This watch has a battery which is charged by exposing the dial to light such as
direct sunlight or fluorescent lamps.
To obtain the best performance:
• Expose the dial to direct sunlight at least once a month.
• After taking off the watch, put it where the dial is exposed to bright light,
such as by a window.
• Before storing the watch in a dark place for an extended period of time, fully
charge the battery.
When the watch is covered with long sleeves, for example, the battery may not
be charged sufficiently. Try to keep the watch exposed to light.
Do not charge the battery at a high temperature (about 60˚C/140˚F or
higher).

7
English
7When the battery becomes short of power—Insufficient charge
warning function
• After the battery is charged for a while, the
second hand will move normally.
• If you have not charged the battery for three
days or more since the warning movement
began, the battery will run out and the watch
will stop.
When the battery becomes short of power, the second hand moves once
every two seconds—insufficient charge warning function. Charge the
battery by exposing the dial to light.
NOTICE:
You c an not check or adjust the settings while
the warning movement continues, though
you can see the time.
The two-second
interval movement

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7Charging time
Below are the approximate values when exposing to the light continuously.
The charging time differs depending on the color of dial or other conditions.
Use the table below only for your reference.
Illuminance
(Lx) Environment
Charging time to
work for one day
(approx.)
Charging time to start
working normally when the
battery is empty (approx.)
500 Interior lighting 4 hours 60 hours
1,000 60-70 cm (24-28 in.) under a
fluorescent lamp (30 W) 2 hours 25 hours
3,000 20 cm (8 in.) under a fluorescent
lamp (30 W) 40 minutes 7.5 hours
10,000 Under cloudy weather 11 minutes 2.5 hours
100,000 Under direct sunlight in summer 2 minutes 45 minutes
Battery duration after full charging (without further charging) About 12 months
Charging the battery

9
English
This watch has the ”Eco-Drive” system, which
converts light into electrical energy with the solar cell
beneath the dial.
The system makes you free from care of battery
replacement and is environment-friendly because of
no battery disposal.
Time for charging fully
when the battery is
empty (approx.)
—
—
—
70 hours
35 hours
7After the battery is fully charged—
Overcharge prevention function
After the battery is fully charged, charging
automatically stops to prevent overcharging, which
may damage to the battery, or affect the accuracy,
functions, and performance of the watch.
Eco-Drive

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1. Pull out the crown to position .
All hands stop moving.
• To set the time accurately, pull out the
crown when the second hand is at the
0-second position.
Setting the time
Date window
24-hour hand
Second hand

11
English
2. Turn the crown to set the time.
All hands other than the second hand will move.
• Take care of the position of the 24-hour hand to set A.M. or
P.M. correctly.
• When you set the hands to around midnight, the date will
change to the following day. To return to the previous day, set
the hands to any position before 23:30.
Go to step 3after the date has completely stopped.
3. Push in the crown to position .
The watch starts moving.
• To set the time accurately, push in the crown by the time signal.

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The crown
position
The button
operation
To check a
date —
To check a
month —
To check an
year
Pressing
button A*2
Checking the date, month, and year
Button A
*1This watch shows the number of years passed since the last leap year.
*2Each time you press button Awhile the crown is set to position , you can display
the month and year alternately.
Date window
Yo u c a n check the date, month, and year*1.

13
English
Display examples of the date window
When checking a date
Ex. 5th day
When checking a month
Ex. February
• “M” stands for Month.
When checking an year
Ex. Next year of a leap year
• “L.Y.” stands for Leap Year.
The date is automatically adjusted until February 28, 2100.
So you do not need to correct it at the end of months.
Perpetual calendar
The figures in the date window change slowly.

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The calendar setting has the following stages:
Enter the setting mode
(→page 15)
Set the year
(→page 16)
Set the month
(→page 18)
Set the date
(→page 20)
Setting the year, month, and date
Before setting:
• You cannot go back to the previous setting.
• You cannot go to the next step while the figures in the date window are moving.
• To stop setting, change the position of the crown. In this case, the settings you have
made are cleared.
NOTICE:
Do not operate between 23:00 and 0:30; otherwise, the date may not change even if the
24-hour hand moves past midnight.

15
English
1. Enter the setting mode
1-1. Pull out the crown to position .
The month appears in the date window.
1-2. Press and hold button Buntil the
figures in the date window start
moving.
The figures in the date window change slowly.
Go to the next page
The figures in the date window move slightly
up and down or right and left, or change to
tell you that you can do the next operation.
Date window Button B

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2. Set the year
Button A
Quick reference chart for number of years
passed since leap year
Year Passed year Year Passed year
2004 Leap year 2008 Leap year
2005 One year 2009 One year
2006 Two years 2010 Two years
2007 Three years 2011 Three years
Date window
Setting the year, month, and date
Button B
Set the number of years passed since the last leap year.

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English
Go to the next page
Ex. Setting value Window
When the current
year is a leap year 0
When two years
have passed 2
2-1. Press button Arepeatedly to set
the year.
2-2. Press button B.
Now you can set the month.

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3. Set the month
Button B
Button A
Date window
Setting the year, month, and date
Set the month—tens digit, then ones digit.

19
English
3-2. Press button B.
Now you can set the ones digit.
3-3. Press button Arepeatedly to set
the ones digit of the month.
3-1. Press button Ato set the tens digit
of the month. Month Setting value Window
From January
to September M0
From October
to December M1
Ex. Setting value Window
September 9
November 1
Go to the next page
3-4. Press button B.
Now you can set the date.