Citizen B51 Manuale utente

English

CONTENTS

1. Features .................................................................................................. 4

2. Explanation of Displays and Buttons ................................................... 5

3. Setting the Time and Date .................................................................... 6

4. Characteristic Functions of Solar-Powered Watches ......................... 8

5. General Reference for Charging Times ............................................. 10

6. Charging Procedure ............................................................................ 11

A. Charging by Exposing the Solar Cell to Light ................................. 11

B. Charging by Swinging the Watch ..................................................... 13

7. Warning Features ................................................................................ 15

8. Using the Chronograph ....................................................................... 17

9. Zeroing the Chronograph Second Hand ........................................... 19

10. Helpful Hints in Using your Watch .................................................. 21

11. Secondary Battery ............................................................................. 22

12. Using the Tachymeter (When Provided) ......................................... 23

13. Precautions ......................................................................................... 24

14. Specifications ..................................................................................... 30

Make Sure the Watch is Sufficiently Charged Before Use

Check that the second hand of the watch is moving correctly in 1-second interval

movement before use. If the second hand is moving in 2-second interval move-

ment or is stopped, this indicates that the watch is not fully charged. When this

happens, expose the solar cell to light to recharge or recharge the watch by swing-

ing.

When exposing the watch to light, do not place the watch too close to the light

source. This can cause the watch to overheat which can lead to a possible mal-

function.

2. Explanation of Displays and Buttons

Please refer to the illustration of the watch on the inside cover.

Name Time display

Hour display

Minute display

Second display

24 hour display

Setting the time and date

Chronograph display

Chronograph second (1/5

second) display

1: Hour hand

2: Minute hand

3: Second hand

4: 24 hour hand

5: Chronograph second hand

6: Chronograph minute hand

A: Button

B: Button

C: Crown

Chronograph minute display

Start/stop

Reset

1. Features

This analog quartz watch incorporates a solar cell in the watch face. In addition to being

equipped with a photoelectric power generation function that converts light energy to

electrical energy, it also is equipped with a self-winding power generation function that

converts "movement of the watch" produced by swinging the watch while wearing on

the wrist into electrical energy. Once fully charged, the watch will continue to run for

approximately 5 months without recharging. In addition, this watch is also provided

with a chronograph function (60 minute clock) that allows measurement of time in 0.2

second (1/5 second) units.

This watch also uses a secondary battery for storing the electrical energy that is gener-

ated. This battery is completely free of mercury and other hazardous substances. Since

this secondary battery is able to be repeatedly charged and discharged, it is not required

to be periodically replaced as in the case of ordinary watch batteries.

(1)Pull the crown out to the time correction position (2nd position) so that the second

hand stops at the 0 second position.

(2)Turn the crown to set the time.

*The date changes at 12:00 AM. Set the time while being careful not to mistake AM

and PM.

(3)Push the crown in to the normal position in synchronization with a telephone time

service or other official time service.

(1)Pull the crown out to the date correction position (1st position).

(2)Turn the crown to set the date.

Turning the crown towards you (counter-clockwise) advances the date by one day.

The date will not move if the crown is turned in the opposite direction (clockwise).

(3)Return the crown to the normal position.

*Do not attempt to set the date between the hours of 9:00 PM and 1:00 AM. Setting

the date during this time may not result in the date changing on the following day.

* If the crown is of the screw-tightened type, set the time and date after first loosening

the screw. Retighten the screw after the time and date have been set.

3. Setting the Time and Date

If the watch stops or the second hand moves at two second intervals when setting

the time, charge the watch by referring to Section 6 entitled, “Charging Procedure”

to return the watch to the normal 1-second interval movement before attempting to

set the time and date.

Hours

24 hour hand

Seconds

Minutes

Date correction (1st) position

Crown

Time correction (2nd) position

Normal position

[Time Setting Warning Feature]

When the time is set

while undercharged

Irregular 2-second

interval movement

When the watch is

charged either by

exposing to light or

swinging, the quick

start function is

activated causing the

hands of the watch to

start moving

Watch stops

4. Characteristic Functions of Solar-Powered Watches

When the watch becomes undercharged, the warning feature illustrated below is acti-

vated and the display of the watch (movement of the second hand) changes.

[Normal Time Display]

When undercharged

When charged

1-second interval movement

When fully charged and the time is set

[Insufficient Charge Warning Feature]

2-second interval

movement

When undercharging is allowed to continue

If the second hand of the watch is moving in 2-second interval movement or has stopped

due to undercharging, recharge the watch either by exposing the solar cell to light or by

swinging.

A. Charging by Exposing the Solar Cell to Light

* Expose the surface of the solar cell to a fluorescent lamp, incandescent light or sunlight

to recharge.

* If the watch is ordinarily concealed from the light as a result of wearing long sleeve

shirts and so on, the watch will be susceptible to becoming undercharged as a result of

not being exposed to light. Try to place the watch in as bright a location as possible

when it is not worn.

* When there are few opportunities for exposing the watch to light, the watch can also be

recharged by swinging in the manner described below.

[Precautions When Charging by Exposing to Light]

* Avoid charging the watch at high temperatures (approx. 60°C/140°F and above) since

allowing the watch to become overheated during charging can lead to a malfunction.

6. Charging Procedure

5. General Reference for Charging Times

(Case of Charging by Illuminating Solar Cell Only)

Charging times differ depending on the watch model (type of face, etc.). The charging

times shown in the table below are meant to only serve as a rough indicator of required

charging times.

*The charging

time indicated

refers to the

duration of

continuous

illumination.

Luminance

(Lux) Environment

Charging time

Charging

time for 1 day

of operation

Charging time from

stop until 1-second

interval movement

Full

charging

time

Typical office

Under a fluorescent

lamp (30 W) at a

distance of 60-70 cm

(24-28in.)

Under a fluorescent lamp

(30 W) at a distance of

20 cm(8 in.)

Cloudy day

Under direct sunlight

on a summer day

2 hours

45 minutes

15 minutes

4 minutes

2 minutes

37 hours, 30 minutes

15 hours

5 hours

1 hour, 30 minutes

30 minutes

335 hours

143 hours

45 hours

13 hours

2 hours, 30

minutes

Full charging time: Time from the state in which the watch is stopped until it is fully charged

Charging time for 1 day of operation: Time required for the watch to run for 1 day using the

normal time display (1-second interval movement)

500

1,000

3,000

10,000

100,000

B. Charging by Swinging the Watch

When there are few opportunities for charging the watch by exposing to light, occasion-

ally charge the watch by swinging. In addition, for those persons who only wear the

watch for short periods of time (several days) or when there is little movement while

wearing the watch, it is also recommended to charge the watch by swinging.

Swing the watch back and forth over a dis-

tance of about 20-25 cm (8-10 in.) at the rate

of about 2-2.5 strokes per second.

* Swing the watch for about 300-500 times

(strokes) when it has stopped.

Examples:

* Charging in close proximity to an incandescent lamp or halogen lamp which can

easily reach high temperatures.

* Charging in locations that can reach high temperatures such as on an automobile

dashboard.

* When charging with an incandescent lamp, always make sure to keep the watch at least

50 cm (20 in.) away from the lamp to prevent the watch from overheating.

7. Warning Features

When this watch becomes undercharged, a warning feature is activated and the display

of the watch changes.

2-second interval

movement

When the second hand is moving in 2 second intervals (moving once every 2 seconds),

this means that the watch is undercharged. Although the watch will continue to run

normally at this time, the watch will stop if 2-second interval movement is allowed to

continue for roughly 1 day. When this happens, charge the watch by referring to Sec-

tion 6 entitled, “Charging Procedure” so that it returns to normal 1-second interval

movement. Furthermore, the chronograph function cannot be

used when the insufficient charging warning feature has been

activated (during 2-second interval movement).

* If charging is only performed until the watch returns to 1-sec-

ond interval movement, it will again return to 2-second inter-

val movement within a few minutes. It is therefore recom-

mended to additionally charge the watch for at least one day’s

worth of charging by exposing to light or by swinging (200-

300 times) to ensure continuous operation.

* Charging will not proceed efficiently if the watch is swung too fast or too slow.

* When swinging the watch, although the sound of the generator turning can be

heard from inside, this is normal and does not indicate a malfunction.

* The watch should be swung approximately 200-300 times to ensure 1 full day’s

worth of charging when running normally (1-second interval movement).

* Charging can be performed even more efficiently by combining charging by ex-

posing the watch to light and charging by swinging.

* Since this watch is provided with an overcharging prevention feature, there is no

risk of damage to the watch due to excess charging.

8. Using the Chronograph

This chronograph is able to measure and display time in 0.2 second (1/5 second) units up

to a maximum of 59 minutes and 59 seconds. After completing measuring time for 60

minutes, it returns to the reset display and stops.

[Chronograph Reset Display]

* If the chronograph second hand

does not return to the zero second

position when the chronograph has

been reset, correct the second hand

position by referring to Section 9

entitled, "Zeroing the Chronograph

Second Hand".

Chronograph seconds

Chronograph

minutes

After the watch has been recharged after having stopped due to being undercharged,

although the watch hands will begin to move, the time will not be correct. The second

hand will begin irregular 2-second interval movement (moving irregularly once every 2

seconds) at this time indicating that the time is incorrect. Reset the time after suffi-

ciently charging the watch by referring to Section 6 entitled, "Charging Procedure”.

When the time has been reset, the second hand will no longer move irregularly in two

second intervals, and return to either 1-second or 2-second interval movement. In the

case of 2-second interval movement, the watch must be additionally charged.

Irregular 2-second

interval movement

9. Zeroing the Chronograph Second Hand

The zero position of the chronograph second hand may rarely shift out of position after

replacing the battery or after the watch has been subjected to a strong shock. When the

chronograph second hand does not return to the zero position when the chronograph has

been reset, correct the hand position using the following procedure.

Chronograph second hand Chronograph minute hand

Normal position

Crown

Correcting position

(2nd position)

(1) Pressing button starts and stops the chronograph.

(2) Pressing button when the chronograph is stopped returns the chronograph to the

reset display.

* If button is pressed by mistake during chronograph measurement, the chronograph

will return to the reset display. Be careful not to accidentally press button during

time measurement.

Reset Measurement Stop Reset

Can be repeated

A A

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