Citizen Nighthawk BJ7000-52E Bedienungsanleitung

CONTENTS

A. BEFORE USING .......................................................................................2

B. SETTING THE TIME AND DATE .............................................................3

C. USING AS A DUAL TIME WATCH ...........................................................6

D. FUNCTIONS OF SOLAR POWERED WATCH ........................................8

Insufficient Charge Warning Function......................................................10

Quick Start Function.................................................................................10

Time Setting Warning Function ...............................................................11

Overcharge Prevention Function ............................................................11

E. CARE AND HANDLING DURING CHARGING ......................................12

F. REPLACING THE SECONDARY BATTERY..........................................13

G. TIME REQUIRED FOR CHARGING ......................................................14

H. USING THE SLIDE RULE .......................................................................16

l. PRECAUTIONS ......................................................................................28

J. SPECIFICATIONS ...................................................................................34

English

B. SETTING THE TIME AND DATE

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

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

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 "G. TIME REQUIRED FOR CHARGING" for charging time reference.

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

secondary battery is a clean energy battery which doesn't use any toxic

substances such as mercury. Once fully charged, the watch will continue

to run for about 6 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. (Overcharge Prevention

Function is included)

We recommend that you recharge the watch everyday.

2 3

Minute hand

Date

Date and Hour hand

correction position

Local time

hours hand

Time (24hour,

minute,second)

correction position

Crown

Second hand Solar cell 24 hour hand

Normal position

WWSetting the Date

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

(2) Turn the crown to the left (counter-clockwise direction) and set the date.

(3) Securely return the crown to the normal position.

* Since the date is linked to movement of the hour hand, the date changes

when the hour hand approaches 12:00 midnight. Please note this

operation when using as a dual time watch.

* Do not attempt to correct the calendar when the hour hand is between the

hours of 9:00 PM and 1:00 AM. Setting the calendar during this time may

result in the date not changing on the following day.

WWSetting the Time

(1) Pull the crown out to the time correction position. (The second hand stops

when the crown is pulled out.)

(2) Turn the crown to set the 24 hour hand and minute hand to the current

time. At this time, the movement of the hour hand is linked with the

movement of the 24 hour hand.

(3) Push the crown back in to the normal position. (The second hand begins

to move when the crown is pushed in.)

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

(5) Turn the crown to the right (clockwise direction) and set the hour hand to the

current time. Pay attention to AM and PM since the location of the hour hand

where the date changes is approximately 12:00 midnight.

(6) Securely return the crown to the normal position.

Reading the Time Based on a 24-Hour Clock

Read the time on the inside (1:00 to 12:00) with the short hand of the 24 hour

hand, and the time on the outside (13:00 to 24:00) with the long hand.

WWCorrecting the Local Time Hours

(1) Pull the crown out to the local time correction position. (1st click position)

(2) Turn the crown to the right (clockwise direction) and set the hour hand to the

desired time. The hour hand can be corrected in +1 hour increments in the

clockwise direction. Set the time while paying attention to AM and PM.

(3) Securely return the crown to the normal position.

* The hour hand cannot be corrected in the counter-clockwise direction. The

date changes when the crown is turned to the left (counter-clockwise). In

addition, since the calendar is linked with the operation of the hour hand, it

may be necessary to correct the calendar after correcting the hour hand

depending on the time to which the hour hand was set.

C. USING AS A DUAL TIME WATCH

This watch allows the hour hand only to be corrected independently without

stopping the watch. It can be used as a dual time watch by setting the 24 hour

hand and hour hand to different times. After correcting the time, the hour hand

is used to indicate the "local time hours".

Hour (local time hour) hand

Minute hand

Crown

Normal position

24 hour hand

Local time

correction position

If the charge becomes insufficient, a warning function will operate and the

display changes, as below.

D. FUNCTIONS OF SOLAR POWERED WATCH

If insufficiently

charged and

time is set

If insufficient charge continues

Hitch movement

Stop

The watch will begin to operate

soon after it is exposed to light due

to Quick Start Function

Time setting

warning display

If insufficiently

charged

If sufficiently charged and time is set

Normal time

display

Insufficient charge

warning display

One second

interval movement

Two second

interval movement

If sufficiently

charged

WWInsufficient Charge Warning Function

The second hand changes to a two second

interval movement to indicate insufficient

recharging.

Even in such a case, the watch keeps correct

time, but about 3 days after the two second

interval movement begins, the watch will stop.

After exposing the watch to light, recharging takes

place and the watch returns to one second

interval movement.

WWQuick 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.)

WWTime 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 incorrect.

In this case, quickly recharge the watch and reset

the time.

Otherwise, the hitch movement will continue.

WWOvercharge 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.

10 11

Two second interval

movement Hitch movement

2sec.

E. CARE AND HANDLING DURING CHARGING

WWNotes 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.

WWNotes 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 a halogen lamp.

Charging in a place that easily becomes hot, such as a dashboard.

When you charge the watch with an incandescent lamp, halogen lamp or other

light source that generates heat, take a distance about 50cm (20in.) from the

light source to prevent extremely high temperature.

F. 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.

12 13

G. TIME REQUIRED FOR CHARGING

Time required for recharging may vary according to the design (color of the dial,

etc.) and operating environment. The following table will serve you as rough

reference.

* The recharging time is the time when the watch is continuously exposed to

radiation.

Full recharging time ... The time for fully recharge from stopped.

(Empty to full)

One day usage .......... The time required for the watch to run for one day with

one second interval movement

14 15

Illuminance

(lux)

500

1000

3000

10000

100000

Environment

inside an ordinary

office

Time required

22 hours

11 hours

3 hours

30 minutes

1 hour

14 minutes

One day

usage

1 hour

30 minutes

45 minutes

15 minutes

5 minutes

2 minutes

Empty to full

320 hours

158 hours

53 hours

17 hours

6 hours

60-70cm (24-28in.) under

a fluorescent light (30W)

20cm (8in.) under a

fluorescent light (30W)

Exterior, cloudy

Exterior, summer,

sunny

From the stop state

to the one second

movement

1716

H. USING THE SLIDE RULE

Flying distance and other navigation

calculations as well as general

calculations can be performed using

the slide rule located around the

outside of the dial. This slide rule is

not able to display decimal places for

calculation results, and should only

be used as a general reference as an

alternative to more accurate

calculations. Turning the crown at

the 8:00 position allows the slide rule

around the dial (Outside Scale) to be

rotated.

A. Navigation Calculator

1. Calculation of time required

Question: How long does it take an airplane flying at 180 knots to fly a

distance of 450 nautical miles?

Solution: Set the 18 mark on the outside scale to the SPEED INDEX (Y). At

this time, the point on the inside scale that is aligned with 45 on the

outside scale indicates (2:30), and the answer is 2 hours and 30

minutes.

Inside scale

Outside

scale

Crown for turning the outer scale

2. Speed (Ground Speed) Calculation

Question: What is the speed (ground speed) of an airplane when it takes 1

hour and 20 minutes to fly a distance of 240 nautical miles?

Solution: Align the 24 on the outside scale with 1:20 (80) on the inside scale.

At this time, 18 is aligned with the SPEED INDEX (Y) on the inside

scale, and the answer is 180 Kt.

18 19

3. Flying distance calculation

Question: What is the flying distance traveled in 40 minutes at a speed of 210

knots?

Solution: Align the 21 on the outside scale with the SPEED INDEX (Y) of the

inside scale. The 40 of the inside scale is now pointing to 14, and

the answer is 140 nautical miles.

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