- TECHNICAL INFORMATION CITIZEN QUARTZ ` Cal. No.` C820

- TECHNICAL INFORMATION CITIZEN QUARTZ ` Cal. No.` C820
TECHNICAL INFORMATION
CITIZEN QUARTZ
~ Cal. No. C820
CITIZEN IS A REGISTERED TRADEMARK OF CITIZEN WATCH CQ, JAPAN.
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Contents
OUTLINE ....................riieereesooreeeicen ee reee.
SPECIFICATIONS
NAME OF PARTS ...................................—.
HOW TO SWITCH THE DIGITAL DISPLAY
SETTING THE ANALOG TIME
BAS AA ARRAN ETES
D. Chronograph Mode
E. Timer Mode
ALL RESET FUNCTION
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DISASSEMBLY AND ASSEMBLY OF MOVEMENT/
TROUBLE SHOOTING AND ADJUSTMENT
AEE PRS FASE RENNES NET
§1. OUTLINE
This is a combination quartz watch with a full range of features such as Time, Calendar, Alarm,
Chronograph, and Timer, plus the taplight function, which illuminates the face when you tap the
watch face gently. The display can be switched easily, so that the entire digital display is cleared,
leaving only the time and calendar characters, or the entire digital display appears, or some
other configuration. An EL light is included, which can be switched on using the tap switch.
§2. SPECIFICATION
CaliberNo. ~~. C820
Type о Combination quartz watch
Movement size (mm) a a 230.8 x 6.41t
Time accuracy (At normal temperature) Within +20 sec/month (+5%C ~ +35°C / 41% - 95°F)
IC | a 1 unit of C/MOS-LSI
Operating temperature 0°C ~ +55°C (32°F ~ 131°F)
Converter
Bipolar step motor |
Time adjustment No adjustment terminal for in the market
Measurement gate
10 sec.
Analog time - o Hour, Minute, Second
- a Hours, Minutes, Seconds, Normal time/switch to summertime
5 Time (daylight saving time), AM/PM
£ — | Calendar Month, Date, Day, (Year)
“+ q. — -
& | > |. Alarm Hours, Minutes, ON/OFF, Alarm Monitor
CL -
‚© | 24-hour measurement (in 1/100 second units), Split time
Q Chronograph Measurement | a.
Timer 60-minute countdown (in 1 minute increments)
Tap switch function
EL light function
Parts No. / Code 280-74/SR936W
About 2 years. (Based on assumed use of alarm buzzer 20 sec-
onds/day, timer buzzer 5 seconds/week and EL light 18 sec-
onds/day.)
Additinal function
Battery
Life time
* These specifications are subject to change, for product improvement, without prior notice.
§3. NAME OF PARTS
Second graphic NN
Hour hand /? Minute hand
: Button € < : > 5/1 second
Mode display
graphic display
O0; 5
rs; Po Эй 7
Second hand - LS Я. A
Button NN N < > 7 / ution @
Digital display
§4. HOW TO SWITCH THE DIGITAL DISPLAY
* Use the tap switch or button to switch the time and calendar modes between three digital dis-
plays. Set the time and calendar displays according to their respective adjustment methods.
(1) How to switch the display by tap switch
(by tapping the watch gently)
* When the tap switch is on, tap the face of
the watch (the glass or somewhere else)
gently with your fingernail to light the EL
light and switch the display.
* Do not tap on the glass face with any
sharp or metallic object as these could
scratch or break the glass.
. ww If the watch is strapped tightly to your
wrist, it may become difficult to switch the
tap switch on. For best results, adjust the
strap to deep some slack.
<How to Switch the Tap Switch “ON” and “OFF”
| | * When the watch is in time adjustment mode,
— Tap switch ON/OFF mark press button @ to switch the tap switch ON
| and OFF alternately. When the tap switch is
ON, “ON” appears next to the TAP mark.
(1) Press button M to switch to time mode.
(2) Press button ® for 2 seconds or longer to
put the watch in time adjustment mode.
(3) Press button ® while both “TAP” and “TME”
are flashing to switch ON and OFF.
(Note) Each time you press button ®, the
adjustment position shifts through
summertime, seconds, minutes,
hours, 12H/24H.
(4) Press button W to return to normal Time display.
(2) How to switch the display by pressing buttons
* Regardless of whether the tap switch is ON or OFF, the display changes each time you
press button ® during normal Time or Calendar display.
(3) Switching the digital display
Full display of time Alphanumeric display only No display of time
or calendar of time or calendar or calendar
Button — Button (8)
or Tap Switch or Tap Switch
Button (8) or Tap Switch |
§5. SETTING THE ANALOG TIME
You may also set the analog and digital displays | (1) Pull the crown out SO that the second hand
| for different times as a dual time display. stops at the "0" position.
(2) Turn the crown and set the hands to the cor-
rect time.
(3) After setting the time, press the crown back I
in to start the watch.
w Stop the second hand at the “0” position and
then press the crown when the digital display
reaches zero seconds. The second hand will
start moving in synchronization with the digi-
Time Adjustment Position — tal display. |
86. SWITCHING DIGITAL FUNCTIONS (MODES)
In addition to Time mode, this watch has 4 other modes; Calendar, Alarm, Chronograph and
— Timer. Each time you press button W, mode changes. |
TME > CAL _ > ALM
Time Mode Calendar Mode Alarm Mode
TMR CHR
Timer Mode Chronograph Mode
Auto-Return
* When the watch is left in Alarm mode (normal display) for more than 2 minutes without any
button operation, the display will automatically return to Time mode.
§7. USING DIGITAL FUNCTIONS (MODES)
A. TIME MODE
* Press the button (A) (or kept pressing) while the watch is in normal Time display to switch the
EL light on.
<To Set Time>
(1) Press button (B) for 2 seconds or longer dur- .
ing Time mode (normal display) to change to
adjustment mode. The time display and
graphic display will disappear and “TAP” and
“TME" will flash.
(2) Press button @ while “TAP” and “TME” are
flashing to switch the tap switch ON and
OFF.
(3) Press button ® while “TAP” and “TME” are
flashing to change the area of the display
that is flashing. Press button ® until the posi-
tion you want to adjsut is flashing. |
(4) Press button (9) to adjust flashing section.
* Press and hold button @ for rapid advancement. Summertime and 12H/24H change each
time the button is pressed. There is no rapid advancement for these functions.
(5) Press button ® while seconds are flashing, seconds will return to “00” and restart.
e |f seconds show 30 through 59, minutes display will advance one minute.
(6) Press button ® to return to normal Time display.
Time Mode | O
>| Switching ON/OFF | Switching
Normal Display . | for Tap Switch | Summertime
( Full Time Display ) < | le
| Swiching 12H/24H Seconds
| | У - —
Alphanumeric Time | | 6] le
Display ) — — —
- Hours —2 | Minutes
v
0 No Time Display ) <Button Make>
| © : Press button ®) for 2 seconds or longer
: Press button B) once
7
* Auto-Return to the normal Time display (Full Time Display) will be activated when the
watch is left in the adjustment mode for about 2 minutes.
* Make sure that the AM/PM indication is correct when setting the time in the 12-hour dis-
play system.
* Instant Manual Return to normal Time display (Full Time Display) can be made by press-
ing button W in Time adjustment mode.
\.
B. CALENDAR MODE
e |f you press button @ (or kept pressing) while the watch is in normal Calendar mode, the EL
light will flash.
<To Set Calendar>
(1) If you press and hold button (8) for 2 seconds
or longer while the watch is in Calendar
mode (normal display), the “Month” will start
flashing, indicating that the watch is in
adjustment mode.
(2) Each time you press button ®), flashing posi-
you want to adjust.
(3) Press button (A) to adjust flashing position.
(Press and hold button (A) for rapid advance-
ment.)
(4) Press button Мю return to normal Calendar
display. |
* Day of the week is automatically set with
adjustment of Year, Month and Date.
Calendar Mode Normal Display
Full Calendar | _® | Alphanumeric | 8 ¿| No Calendar
Display Calendar Display Display
— 1 — le
[o
Year фен Date — Month
r | | | - — | |
* Calenda can be set from 1999 through 2099.
* Auto-Return to normal Calendar display will be activated when the watch is left in
Calendar adjustment mode (flashing display) for about 2 minutes.
* When Calendar is set to a non-existent date (e.g., February 30), display will automatically
show the first day of next month when returned to normal mode.
Month-end adjustments are not necessary since calendar is programmed to set automati-
cally.
e Instant Manual Return to normal Calendar display (Full Calendar Display) can be made by
pressing button W in Calendar adjustment mode.
J
tion changes as shown below. Flash the part
C. ALARM MODE
* When the tap switch is ON, tap the watch gently to light the EL light.
[Normal Alarm Display] <To Set Alarm>
(1) Press and hold button ® in Alarm mode (nor-
mal display) for 2 seconds or longer, “Hour”
starts flashing and may be adjusted.
(2) Each time you press button ®, flashing posi-
tion changes. Flash the part you want to
adjust.
(3) Press button ® to set the time you want the
alarm to sound. (Press and hold button (A) for
rapid advancement.) |
(4) Press button ® to return to Alarm mode (normal display).
Note) If the watch is set to 12-hour display (AM-PM) in Time mode, Alarm will also be set to |
12-hour display. |
— Normal Alarm Display “ON” “Normal Alarm Display “OFF”
>
««
Button (A)
Switching ON/OFF
O
| Minutes |< - { Hours. |
<To Switch Alarm ON/OFF>
e Press button (A) in Alarm mode (normal display) to switch the alarm ON or OFF.
<Duration of Alarm Sounding and How to Stop the Alarm Sound>
* Alarm will sound for 15 seconds. ;
e Press any button to stop Alarm sound.
<Alarm Sound Monitor>
e Press and hold button @ in Alarm mode to make the alarm monitor sound.
<Auto-Return>
e The display will return to normal Alarm display “ON” in Alarm adjustment mode if no buttons
are pressed for 2 minutes or longer. The display will return to normal Time mode if no buttons
are pressed for 2 minutes or longer in normal Alarm display.
<Instant Manual Return> -
o Press button W in Alarm adjustment mode to return to Alarm mode (normal display).
D. CHRONOGRAPH MODE
a: e Chronograph measures in units of 1/100 of a
[Chronograph Reset Position] second, up to “23 hours, 59 minutes 59 sec-
Minutes onds”. On reaching 24 hours of elapsed time,
0 toa) it resets to “00 minutes 00 seconds and 00”
Seconds hundredths and stops.
Cm after * When the tap switch is ÓN, tap the watch gen-
u
tly to light the EL light.
1/100 second
(“seconds” after
- 60 minutes)
Display of Time Measurement
*e Chronograph shows “Minutes”, “Seconds” and “1/100 second” and will change to
“Hours”, “Minutes” and “Seconds” after 60 minutes. |
<Elapsed Time Measurement>
(1) Press button @® to start/stop Chronograph.
@ Each time you press button (A) while in time measurement, start/stop is repeated.
O EL light is turned ON for 3 seconds when counting is stopped.
(2) Press button ® when counting is stopped reset Chronograph.
<Split Time Measurement>
(1) Press button @ to start/stop Chronograph.
(2) Press button ® while in time measurement. Split time will appear for 10 seconds.
@ “SPL” will flash while split time is displayed.
@ EL Light is turned on for 3 seconds at the time of split time operation.
(3) Press button ® when counting is stopped reset Chronograph.
[Initial Chronograph Setting]
- Auto-Retum after 24 hours -
' Chronograph ®_ Ä
"Measuring |<- Stop
Auto-Return after 10 seconds
Gum aer 24h Split Time ®
uto-neturn after ours
L 4
Split Time
1
Y If switched to another mode while Chronograph is running and then returned to
Chronograph mode again, the watch will return to countdown counting at the time of
switching. (If switched while Split Time is shown, the watch will return to Chronograph run-
ning mode.)
However, if Chronograph counting has exceeded 24 hours, the watch will return to initial
| Chronograph reset display.
E. TIME MODE
Initial Timer Settin * Timer can be set in units of 1 minute up to 60
gl | minutes. When Timer countdown is finished,
Remaining Time — buzzer will sound for about 5 seconds and
(Minutes, Seconds) return to the Timer set time.
* When the tap switch is ON, tap the watch gen-
tly to light the EL light.
Timer Setting Time
<To Set Timer>
(1) If you press button ® while the set time is flashing in timer mode, the set time will be reduced
by one minute for each time you press and release the button. Continue until you reach the
set time you want.
(Press and hold button ® to make rapid adjustment to the set time.)
<To Use Timer>
(1) Press button ®. Timer starts countdown from set time.
(2) Press button @ to stop Timer during in the measurement. Press button (A) to start it again
while in the “Stop” position.
* Press button ®, while Timer is in operation, to return to the initial set time, and start the
countdwon again.
(3) If you press button ® while Timer is stopped, Timer will return to the initial set time.
* The confirmation tone will sound when you press the button.
- Timer Running | | Stop
Time up
Timer Countdown
Auto-Return in about 5 seconds Finished
after time up
w If the watch is switched to another mode while Timer is in operation and then returned to
Timer mode again, the watch will return to countdown continuing at the time of switching,
However, if countdown has been completed, the watch will return to initial Timer setting.
§8. ALL RESET FUNCTION
Use All Reset function to reset the watch after replacing the battery or if the watch is showing
abnormal operation or display. All Reset function can be performed as follows:
(1) Pull crown out.
(2) Press buttons ®, ® and M simultaneously. (All digital displays will disappear while pressing)
(3) Release three buttons. (All digital displays are shown.) |
(4) Push crown in. (At this point, buzzer sounds in confirmation.)
This completes the All-Reset operation. Set each mode correctly before using the watch.
59. DISASSEMBLY AND ASSEMBLY OF MOVEMENT/
‘TROUBLESHOOTING AND ADJUSTMENT
Basic structure of movement is same to CAL. C810.
Refer to. CAL. C810 Technical Information for disassembly and assembly of movement trou-
bleshooting and adjustment. |
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