Citizen | C720 | . CITIZEN

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TECHNICAL INFORMATION
INFORMACION
TECNICA
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CITIZEN QUARTZ
Cal. No. C720
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. CITIZEN
cmZEN
"
IS A REGISTERED TRADEMARK OF CmZEN WATCH 00, JAPAN
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Contents
§1. OUTLlNE
1
§2. SPECIFICATIONS
1
,
§3. NAME OF PARTS
,
2
§4. SETTING THE HANDS
,
2
§5. CHANGING MODES (FUNCTIONS)
2
§6. USING EACH FUNCTION (MODE)
A. TIME/CALENDAR MODE ...,
B. ZONE SET MODE
...
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3
3
..5
C. ALARM 1 & 2 MODES
D. TIMER MODE
E. CHRONOGRAPHMODE
6
7
8
§7. THERMOMETER
...
A. METHODSOF MEASUREMENT
B. TEMPERATUREMEASUREMENTRANGEAND ACCURACY
C. SWITCHINGBETWEENCELSIUS/FAHRENHEIT
DISPLAY
§8. LOW BATTERYINDICATOR
§9. ALL RESET
§10. PRECAUTIONSFOR HANDLINGTEMPERATURESENSOR
§11. TROUBLESHOOTINGAND ADJUSTMENT
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Indice
§1. DESCRIPCION GENERAL
13
§2. ESPECIFICACIONES
13
§3. NOMENCLATURA DE PARTES
14
§4. AJUSTE ANALOGICO
§5. CAMBIO DE MODOS(FUNCIONES)
14
,
14
§6. UTILIZAR CADA FUNCION (MODO)
15
A. MODO DEHORA/CALENDARIO
B. MODODE AJUSTEDE ZONA
C. MODOSDE ALARMA1 Y 2
D. MODODE TEMPORIZADOR
E. MODODECRONOMETRO
§7.
15
17
18
19
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20
TERMOMETRO
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A. METODOSDE MEDICION
B. ALCANCEY PRECISIONDE LA MEDICIONDE TEMPERATURA
C. CONMUTACION
DE LA INDICACION
ENTRE
CENTIGRADOS/FAHRENHEIT..
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21
§8. INDICADOR DE PILA CON CARGA BAJA
22
§9. REAJUSTE TOTAL
22
§10. PRECAUCIONES PARA EL MANEJO
DEL SENSOR DE TEMPERATURA
23
§11. SOLUCION DE PROBLEMAS Y AJUSTE
23
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§1. OUTLINE
This watch is a combination quartz watch with a world time function, which displays the time in
30 world cities and the UTC (Coordinated Universal Time), and a thermometer function. It also
includes an EL (electroluminescence) light function.
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§2. SPECIFICATIONS
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CaliberNo.
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C720
Type
Combination quartz watch
'" 30.8 x 5.45t
Movement size (mm)
Accuracy (At normal temperature)
~20 sec/month (+5°C to +35°C /41 of to 95°F)
IC
2 units of C/MOS-LSI
Operating temperature
-10°C to +60°C (14°F to 140°F)
Converter
Bipolar step motor
Time adjustment
No adjustment terminal for in the market
Measurement gate
10 sec.
Analog,time
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Hour, Minute, Second, Month, Day, Day of the week, City,
Temperature
SET/OFF settings, and summer time settings
Alarm 1/Alarm 2
Timer
Ch
Hour, Minute, ON/OFF, City
100-minute timer (1 minute unit)
h
ronograp
24-hour measurement
(1/1000 second unit),
S I. .
P It time measurement
. World time function
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Ime a en ar
Zone set
c5:"2>
if
Hour, Minute, Second
. .,
Additional functions
. EL light function
. Thermometerf unction
.
. Low battery indicator function
Parts No. / Code
?:-
280-44/
Normal voltage / Capacity
SR927W
1.55V /60mAH
Q)
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Life time
Approx. 2 years.
(Alarm sound: 30 sec./day, Timer sound: 5 sec./day,
EL illuminate: 3 sec,/day)
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1
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§3. NAME OF PARTS
Mode mark display
Digital display [2]
Bu
Minute hand
Hour hand
Thermo sensor
Crown
@
Bu
Digital display [1]
Second hand
Graphic display
§4. SETTING THE HANDS
(1) ~~~Id~he crown out to stop the second
nd
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(2) Turn the crown to set the correct time.
(3) Press the crown back in to restart.
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Setting position
Analog and digital time can be set individually as a dual-time watch.
§5. CHANGING MODES (FUNCTIONS)
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This watch has the modes (functions) listed below.
Each time button @ is pressed, the mode changes. The current mode is indicated by the mode
mark. For details on how to use each mode, see the appropriated section.
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Mode mark
(blinking)
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Mode mark
Mode (function)
TME
Time/Calendar
SET
Zone Set*1
AL-1
Alarm 1
AL-2
Alarm 2
TMR
Timer
CHR
Chronograph
* 1: Zone Set mode
This mode abies to set, for each of 30 world cities and the UTC (Coordinated Universal Time), a
display (SET)/non-display (OFF) setting and a summer time setting.
* If the watch is left in the Zone Set mode, Alarm 1 or Alarm 2 mode for approximately 2 minutes,
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it will automatically return to Time/Calendar mode.
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§6. USING EACH FUNCTION (MODE)
A. TIME/CALENDARMODE
[Time display]
[Calendar,
temperature
nd
display]
[City selection
ature
ity (bli
-.
@
City
display]
ond
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Month, day
Day of the week
ure
1. Changing the display
. The "time display" changes to "calendar, temperature display" when button@ispressed.
.
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.
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.
The "calendar, temperature display" changes to "city selection display" when button @ is
pressed.
The "city selection display" changes to "time display" when button @ is pressed.
When you change to "calendar, temperature display", the temperature will be measured and
displayed at 2-second intervals for approximately 2 minutes. (Temperature measurement by
button operation)
The graphic display in "time display" and "city selection display" is an approximate indication
of the latest measured temperature.
In each of the displays, the EL light goes on when button @ is pressed.
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2. Change the displayed city
.
During the "city selection display" (city name blinks), every time button @ is pressed, the dis-
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.
played city will change according to the sequence shown in the chart on the next page.
If button @ is pressed while button @ is being pressed, the displayed city will change in the
f
opposite order.
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* After changing the displayed city, press button @ to return to time display.
* A city for which OFF has been selected in the Zone Set mode will not be displayed.
* In the charg, cities (regions) with summer time system are indicated by 0, X without summer
time system.
* Time difference and summer time for cities, are subject to change. (The chart shows the situation
in 1997.)
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<The time difference between the cities and UTCtime>
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Time Summer. .
No. IndIcatIon
CIty
difference time
No. IndIcation
.
CIty
Time Summer-
difference time
:to
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17
TYO
Tokyo
+9
X
London
Paris
Rome
Cairo
:to
+1
+1
+2
0
0
0
0
18
19
20
21
SYD
NOU
AKL
HNL
Sydney
Noumea
Auckland
Honolulu
+10
+11
+ 12
-10
0
X
0
X
1ST
MOW
KWI
Istanbul
Moscow
Kuwait
+2
+3
+3
0
0
X
22
23
24
ANC
LAX
DEN
Anchorage
Los Angeles
Denver
-9
-8
-7
0
0
0
9
10
DXB
KHI
Dubai
Karachi
+4
+5
X
X
25
26
CHI
MEX
Chicago
MexicoCity
-6
-6
0
X
11
12
13
DEL
DAC
BKK
New Delhi
Dacca
Bangkok
+5.5
+6
+7
X
X
X
27
28
29
NYC
YUL
CCS
New York
Montreal
Caracas
-5
-5
-4
0
0
X
1
UTC
2
3
4
5
LON
PAR
ROM
GAl
6
7
8
Universal
timecoordinated
14
SIN
+8
X
30
RIO
15
HKG
Hong Kong
Singapore
+8
X
31
BUE
16
PEK
Beijing
+8
X
Rro de Janeiro
BuenosAires
-3
0
-3
X
,
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3. Adjusting the time and calendar
If the time and calendar settings for any of the 30 cities or the UTC are adjusted, those for all of
the other cities will automatically be adjusted.
(1) Display the adjusting city.
(2) Press button @ continuously for more than 2
seconds in time or calendar/temperature display. It will then become possible to adjust
the figures. The blinking figures can be
adjusted.
[Normal time display]
d
.
City
(3) Each time button @ is pressed, the blinking
figures
will change
to the~following
sequence:
summer according
time ~ second
minute
Hour,minute
.
.
.
~
hour ~
~
year.
12-hour/24-hour
Temperature
~
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month
~
day
(4) Press button @ to adjust the figures. By continuously pressing button @, the figures
change quickly.
Each time button @ is pressed when SUMMER is blinking, the summer time setting will alternatively switch on (ON) or OFF.
The seconds will return to 00 and start again if button @ is pressed. (Moreover, if the seconds
are between 30 and 59, the minutes will increase by 1.)
12-hour/24-hour system will alternately switch, each time button @ is pressed.
(5) Press button @ to return to normal display.
* After the summer time setting is switched ON, "SUMMER" and a time one hour ahead of the
regular time (the time when the summer time setting was OFF) will be displayed. (This only
applies to cities with summer time settings ON.)
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* Be careful to set AM and PM correctly in 12-hour system.
* The year can be set from 2000 to 2099. (The year is only displayed at time of adjustment.)
* Setting the year, month and day automatically sets the day of the week.
* If a non-existent date (for example, February 30) is set, the first day of the next month is displayed automatically be returning to the normal display.
* This watch has an automatic calendar, so it is not necessary to make adjustments for the ends
of months, even in leap years.
* When the watch is left for approximately 2 minutes in the adjustment mode (blinking display), it
will automatically return to normal display.
* If button @ is pressed in the adjustment mode, the watch will immediately return to normal display.
B. ZONE SET MODE
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[Zone setting display]
Timedifference
TC
When button @ is pressed during the normal
display, the EL light goes on.
City
(blinking)
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For each of the 30 cities and the UTC this watch displays, it is possible to set a display/non-display setting, as well as a summer time setting (except for UTC).
Only cities with a SET setting will be displayed in Time/Calendar mode and Alarm modes.
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Hour,minute
SET
1. How to set the zone
(1) Press button @ to display the zone setting city.
(2) Press button @ continuously for more than 2 seconds. In the graphic display, SET (display) or
.OFF (non-display) will blink.
(3) Press button @ and select SET or OFF for the displayed city.
(4) Press button @. "SUMMER" and ON or OFF will blink.
(5) Press button @ and select ON or OFF for the summer time setting.
. If you wish to input settings for other cities, press button @ again. The watch will enter the
adjustment mode for the next city. Then carry out in order, the same steps, selecting SET
(display) or OFF (non-display) and a summer time setting.
(6) After completing the settings, press button @ to return to normal display
* If the watch is left in the adjustment mode for approximately 2 minutes, it will automatically
return to normal display (the city blinks).
* If button @ is pressed in adjustment mode, the watch will immediately return to normal display.
5
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C. ALARM 1 & 2 MODES
Alarm 1 and Alarm 2 differ only in the sounds they make. They are used and set in exactly the
same way. When the alarm is set (ON) once, it sounds for 20 seconds same time everyday. The
alarm sounds stop by pressing any button.
[Normal alarm
tt" d" I (ON)]
se 1"9 ISp ay
ONorOFF
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1. How to set the alarms
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When you set an alarm time or one City, the
same alarm time will automatically be set for
every other city.
(1) Press button @ to display the alarm setting
Ctiy
city.
(blinking)
(2) Press button @ continuously for more than 2
seconds. The "Hours" will blink.
Alarmtime(Hour,
minute)
(3) Press button @ to set the "Hours". By continuously pressing button @, the figures change
quickly.
(4) Press button @. The "Minutes" figure will
blink.
(5) Press button @ to set the "Minutes".
(6) Press button @ to return to normal display.
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* When Time/Calendar mode is on 12-hour system, alarms operate on the same system. Please
pay attention to AM/PM when setting alarm times.
* After alarm is set, the alarm time will not change even if Time/Calendar mode is set to summer
time.
* If the watch is left in adjustment mode for approximately 2 minutes, it will automatically return to
normal display (the city blinks).
* If button @ is pressed in adjustment mode, the watch will immediately return to normal display.
2. Alarm ON/OFF and alarm monitor
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0" ~
N
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@
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O FF
Each time button @ is pressed during the normal alarm display, alarm setting switches alter-
nately between O~ and OFF. ~Iso, the alarm
sound can be confirmed
ingbutton
@.
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by continuously
press-
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D. TIMER MODE
The timer can be set, in increments of 1 minute, for up to 100 hours. After a set time elapses, a
time-up signal sounds for approximately 5 seconds. The timer then returns to the set time and
stops.
[Timer setting display]
1. How to set the timer
(1) Press button @. The "Minutes"will blink.
ature
(2) Press button @ to set the "Minutes". By continuously pressing button @ the figures
changes quickly.
(3) Press button @. The "Hours" will blink.
(4) Press button @ to set the "Hours".
(5) Press button @ to return to the timer setting
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display.
Timertime
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2. Timer countdown
(1) Press button @ to start the timer at the set time.
(2) If button @ is pressed during timer countdown, the timer stops. If button @ is pressed again,
the timer restarts.
(3) If button @ is pressed when the timer stops, the display returns to the timer set time.
~~~~~=>
Automatically
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Set time)
@
B
returns to the set time.
*1
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Countdown
.
:
,
:
(=~~;~~:)
@
@
Stop
~
*1: Timer restart function
If button @ is pressed during timer countdown, the mode immediately changes to timer set time
display and restarts.
<Confirmation sound>
At the time of start, stop, reset or timer restart operation in timer mode, a confirmation sound is
heard.
<Changing modes during timer countdown>
If button @ is pressed in timer mode to change the mode, the time countdown is continued internally. If the mode is changed again to timer mode, the time continuously counted down by the
timer is displayed. However, if the timer time is up, the display returns to timer set time.
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E. CHRONOGRAPH MODE
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[Chronograph reset display]
The chronograph is capable of measuring and
indicating a maximum of 23 hours, 59 minutes,
59 seconds and 999 milliseconds in increments
of 1/1000
After 24 hours, it stops with a
t d . second.
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f "00 °00 '00 "000 " . Th e c h ronorese
ISp ay 0
M
d t'
easure Ime
(milliseconds)
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can also measure
tgraph
.
Ime ) .
Measured
time
(hours,
.
mlnu tes,
seconds)
split time (elapsed
@
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1. Total elapsed time measurement
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(1) The chronograph starts or stops each time button @ is pressed.
(2) To reset the chronograph, press button @ after it is stopped.
1\"'1
2. Split time measurement
(1) The chronograph starts or stops each time button @ is pressed.
(2) Pressbutton @ during a time measurement,and the watch shows a split time for 10 seconds.
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While a split time is shown, "SPLIT" will blink.
Each time button @ is pressed, the chronograph shows the latest split time.
(3) To reset chronograph, press button @ after it is stopped.
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Reset
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@ ~ C
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Measurement
(~=~~~=~~>=JBt.
*1
Split time
) ~(==~~:~~:
~ @ ~
Stop~B
-
@
B
*1:Automaticallyreturns
to measurementmode
after 10 seconds.
P
<Changing the mode during time measurement in chronograph mode>
Even if button @ is pressed during a time measurement in chronograph mode and mode is
changed, time measurement is continued internally. The measured time is shown when the mode
is returned to chronograph again. However, if the time measurement is continued for more than
24 hours, the chronograph stops at the reset state.
* Confirmation sound and EL light
At the time of start, stop, split time check or reset operation in chronograph mode, a confirmation sound is heard.
At the time of stop or a split time measurement, the EL light is turned on with the sound.
Split time: Elapsed time from start point
Split time
~~~II
Startpoint
Goal
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§7. THERMOMETER
A. METHODS OF MEASUREMENT
As described below, there are two methodsof measuringtemperature.
The most
recentlydisplayed
measuredin
temperature
is displayed
in the
(approximate
temperature
is graphically
both the "time
display" and
theTime
"citymode
selection
display") and
in the
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Time mode. Also switching between Celsius display (OC)and Fahrenheit (OF)display is possible.
<Automatic temperature measurement>
Temperature is automatically measured every hour on the hour, with the temperature display then
being updated. However, measurement will not be carried out if the Chronograph mode or
Time/Calendar mode is in the adjustment mode (blinking display) at measurement time.
<Temperature measurement by button operation>
If you change to the "calendar, temperature display" in the Time/Calendar mode, the temperature
will be measured at 2-second intervals for 2 minutes.
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B. TEMPERATURE MEASUREMENT RANGE AND ACCURACY
In Celsius (OC)
If Fahrenheit (OF)
Temperature display range
-9.9°C to +S9.9°C
14°F to 139°F
Measurement unit
0.1°C
1°F
Measurement accuracy
20°C to 30°C: :t 1°C
-SaC to +40°C: :t2°C
68°F to 86°F: :t2°F
23°F to 104°F: :t4°F
(Note>
. If the watch is worn on the wrist durning temperature measurement, the body temperature
affects measurement.
For accurate temperature measurement, take the watch off and leave it in the measuring
evnironment at least for 20 to 30 minutes. The influence of body temperature depends on environmental conditions such as difference between atmospheric temperature and body temperature before taking the watcfh off, etc.
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Do not use the termometer out of the display range. Extremely hot or cold temperature may
cause malfunction of the watch.
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while button @ is pressed, the temperature
OF
~Iay wil~switch from Celsius (OC)to Fahrenheit
( F) or vice versa.
If button @ is pressed first, however,the display
C. SWITCHING BETWEEN CELSIUS/FAHRENHEIT DISPLAY
W
23S.
°C
(A'\
@
Celsius
Fahrenheit
display
display
In the Time mode's "Date, calendar display", by
pressing
button
@ for more than 2 seconds
dis-
will not change.
<About the graphic display of approximate temperature>
Approximate temperature is graphicaliy displayed in the Time mode's "time display" and "city
selection display."
The graphic display always shows Celsius temperature, even when the numerical display has
been set to Fahrenheit.
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§8.
LOW
BATTERY
INDICATOR
When the battery gets weak, the low battery indicator function appears in the display as shown
below.
. The second hand moves at 2-second intervals (moves by 2 increments every seconds).
.
The temperature display starts to blink "- - _" continuously.
Even when the watch falls into such condition, it still displays the time but the EL light, thermometer and alarm will not function.
Immediately replace the battery with new one.
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Blinking
p
2 seconds
§9. ALL RESET
After replacement of the battery, be sure to perform the all reset operation as shown below.
If the watch melfunctions or shows an abnormal display as a result of an excessive shock or static electricity (for example, the watch indicates nothing, continuously sounds alarm, etc.). Perform
the all reset operation.
(1) Pull the crown out.
M
rown
(2) Simultaneously press buttons @, @ and @.
(3) Release the three buttons.
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(4) ~ress the crown back. (A confirmation sound
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IS heard.)
All reset Operation is com plete.
B
Before use, reset the watch for the correct time
in all modes.
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§10.
PRECAUTIONS
FOR
HANDLING
TEMPERATURE
SENSOR
When disassembling and reassembling the
watch or when removing and installing the
movement, take care not to bend the terminals
of the temperature sensor sharply. If those terminals are bent badly, the temperature sensor may
have a trouble in measurement or may be broken.
Since the temperature sensor is sensitive to static electricity, too, handle it with special care.
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Temperature
sensor
'"
<Note>
The temperature sensor and electronic circuit unit are adjusted as a set for high accuracy.
Accordingly, when either of them needs to be replaced, do not replace only that one but
replace them with a set of a new temperature sensor and a electronic circuit unit.
§11.
TROUBLE
SHOOTING
AND
ADJUSTMENT
Basic structure of movement is same to CAL. ClOD.
Refer to CAL. ClOD Technical Information for disassembly and assembly of movement, troubleshooting and adjustment.
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