Citizen CTZ-B6902 User Manual

CITIZEN QUARTZ

Eco-Drive

Model No. BJ1XXX

Cal. No. A16❈

Model No. EP2XXX

Cal. No. A27❈

•INSTRUCTION MANUAL

CTZ-B6902

A. BEFORE USING

This watch is powered not by an ordinary battery,
but by converting photo energy to electrical energy.

Before using, expose to light and make sure
the watch is sufficiently charged.
See “F. TIME FOR CHARGING” for charging
time reference.

A secondary battery is used in this watch to store
electrical energy. This secondary battery is a clean

battery which doesn’t use any toxic substances
such as mercury. Once fully charged, the watch
will continue to run for about 16 months without
further charging.

To use this watch comfortably, make sure that the
watch is always recharged before it stops.

There is no concern for overcharging this watch
(Overcharging Prevention Function is included).

We recommend that you recharge the watch
everyday.

B. SETTING THE TIME AND CALENDAR

1. Models without date supply

 Setting the time

1. Stop the second hand at the 0 second position
by pulling out the crown.

2. Turn the crown to set the time.

3. After setting the time, firmly push the crown back
into its normal position.

2. Models with date display

 Setting the time

1. Stop the second hand at 0 second position by
pulling the crown out to the 2nd click.

2. Turn the crown to the time.

3. After setting the time firmly push the crown back
to its normal position.

 Setting the calendar
Adjusting the date

1. Pull the crown out to the first click.

2. Set the desired date by turning the crown.

• Do not adjust the date when the watch display is
reading between 9:00pm and 1:00am, otherwise
the date might not change on the following day.

3. After you have set the calendar, be sure to firmly
return the crown to its normal position.

C. FUNCTIONS OF SOLAR POWERED WATCH

If the charge becomes insufficient, a warning function will operate and the display changes,
as below.

C. FUNCTIONS OF SOLAR POWERED WATCH

■ Insufficient Charge Warning Function
The second hand changes to a
two second interval movement to
indicate insufficient charging.

Even in such a case, the watch
keeps correct time, but about 20
days after the two second
movement begins, the watch will
stop. After exposing the watch to
light, recharging takes place and the
watch returns to one second interval movement.

■ Quick Start Function

The watch will stop if it is completely discharged.

It will begin to operate soon after it is exposed
to light. (However, the time to start may vary

according to the brightness of the light.)

■ Time Setting Warning Function

If the watch stops, subsequent
exposure to light allows the Quick
Start Function to start again, and the

second hand moves with a hitch to
indicate that the time is incorrect.

■ Overcharge Prevention Function
You can recharge without worry.

Once the secondary battery is fully recharged, the
overcharging prevention feature comes into
operation and prevents over-recharging.

D. CARE AND HANDLING DURING CHARGING

■ Notes on use
Take care to charge your watch during use.

Please note that if you wear long sleeves, the watch
can easily become insufficiently charged because it
is hidden and not exposed to light.

• When you take the watch off, place it in as bright
a place as possible, and it will always continue to
run properly.

■ Notes on recharging

• Avoid recharging at high temperatures (over
about 60˚C/140˚F), otherwise the watch will be
damaged during recharging.
(eg) Charging the watch near a light source that

easily becomes hot, such as an incandescent
lamp or halogen lamp.
Charging in a place that easily becomes hot,
such as a dashboard.

When you charge the watch by an incandescent
lamp, take a distance about 50cm (20in.) from the
light source to prevent extremely high temperature,

E. REPLACING THE SECONDARY BATTERY
Unlike ordinary batteries, the secondary battery
used in this watch doesn’t have to be periodically
replaced due to repeated charging and discharging.

CAUTION

Never use another battery different from the
secondary battery used in this watch.
The watch structure is so designed that a different
kind of battery other than that specified cannot be
used to operate it. In case a different kind of battery
such as a silver battery is used by some chance,
there is a danger that it will be overcharged to
burst, causing damage to the watch and even to
the human body.

F. TIME REQUIRED FOR CHARGING

The time required for charging may vary according
to the caliber number, design (colour of the dial,
etc) and operating environment. The following table
will serve as a rough reference.

*The recharging time is the time when the watch is

continuously exposed to radiation.

Please check the caliber number on the caseback

Full recharging time (Empty to full)...
The time for fully recharge from stopped.
One day usage...
The time required for the watch to run for one day
with one second interval movement.

500

Illuminance

(lux)

Environment

Inside and ordinary

office

12 days 2 hours

55 days

From the stop state to

one second movement

One day usage Empty to full

1000

60-70cm under a

fluorescent light

6 days 1 hour

27 days

3000

20cm under a

fluorescent light 30W

46 hours

20 minutes 9 days

10000

Exterior, cloudy

14 hours

6 minutes 64 hours

100000

Exterior, summer,

sunny

4 hours 30

minutes

2 minutes 22 hours

Cal No. A160

Time required

500

Illuminance

(lux)

Environment

Inside and ordinary

office

19 days 3 hours

85 days

From the stop state to

one second movement

One day usage Empty to full

1000

60-70cm under a

fluorescent light 30W

9 days 1.5 hour

41 days

3000

20cm under a

fluorescent light 30W

70 hours

30 minutes 14 days

10000

Exterior, cloudy

21 hours

9 minutes 96 hours

100000

Exterior, summer,

sunny

7 hours

3 minutes 32 hours

Cal No. A270

Time required