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

8
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