Casio QW-2812 Service Manual & Parts Manual Download Page 4

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2. OPERATION CHART: MODULE QW-2812

Getting Acquainted

Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to carefully read this manual and keep it on hand for later reference
when necessary.

Expose the watch to bright light to charge its battery before using it.
You can use this watch even as its battery is being charged by exposure to bright
light.

Be sure to read “Battery” of this manual for important information you need to
know when exposing the watch to bright light.

If the display of the watch is blank...

If the Power Saving indicator (PS) is on the display (either
flashing or steady), it means that the display is blank
because the watch’s Power Saving function has turned it
off to conserve power. Power Saving automatically turns
off the display and enters a sleep state whenever your
watch is left for a certain period in an area where it is
dark.

• 

The initial factory default setting is Power Saving on.

• 

The watch will recover from the sleep state if you move it
to a well-lit area or if you press any button.

• 

See “Power Saving Function” for more information.

Power saving indicator

About This Manual

• 

Button operations are indicated using the letters shown
in the illustration.

• 

Each section of this manual provides you with the
information you need to perform operations in each
mode. Further details and technical information can be
found in the “Reference” section.

General Guide

• 

Press 

C

 to change from mode to mode.

• 

In any mode, press 

B

 to illuminate the display.

Alarm Mode

Data Memory Mode

Stopwatch Mode

Timekeeping Mode

Press 

C

.

World Time Mode

▲ 

▲ 

▲ 

▲ 

▲ 

Radio-controlled Timekeeping

This watch receives a time calibration signal and updates
its time setting accordingly. The time calibration signal
includes both Standard Time and Daylight Saving Time
(summer time) data.

• 

This watch is designed to pick up the time calibration
signal transmitted from Mainflingen, Germany.

DST indicator

Hour : Minutes

Seconds

PM indicator

Day of week

Month – Day

Current Time Setting
This watch automatically adjusts its time setting in accordance with a time calibration
signal. You can also perform a manual procedure to set the time and date, when
necessary.

• 

The first thing you should do after purchasing this watch is to set your Home City,
which is the city where you will normally use the watch. For more information, see
“To set your Home City” below.

• 

When using the watch in an area that is outside of the range of the transmitter in
Mainflingen, you need to manually adjust the time as required. See “Timekeeping”
for information about manual settings.

To set your Home City

1. In the Timekeeping Mode, hold down 

A

 until the city

code starts to flash, which indicates the setting screen.

2. Use 

D

 (east) and 

B

 (west) to select the city code you

want to use as your Home City.

• 

The following are the city codes for major cities in the
Western Europe time zones.

LON

: London

PAR

 and 

BER

: Paris, Berlin, Milan, Rome,

Amsterdam, Hamburg, Frankfurt,
Vienna

3. Press 

A

 twice to exit the setting screen.

• 

The first press of 

A

 displays the 12/24-hour setting screen. Pressing 

A

 again exits

the setting screen.

• 

Normally, your watch should show the correct time as soon as you select your Home
City code. If it does not, it should adjust automatically after the next auto receive (in
the middle of the night). You can also perform manual receive or you can set the time
manually.

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City code

• 

If you are in an area that does not use Daylight Saving Time (summer time), turn off
the DST setting.

To display the last signal screen
In the Timekeeping Mode, press 

D

 to display the last signal screen (indicated by

GET

). The last signal screen shows the date and time of the last successful time

calibration signal reception.

Press 

D

.

PM indicator

DST indicator Hour : Minutes

Seconds

Day of week

Month – Day

Received time
(Hour : Minutes)

Received date (Month – Day)

Last Signal Screen

▲ 

▲ 

Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal:
auto receive and manual receive.

• 

Auto Receive
With auto receive, the watch automatically picks up the time calibration signal five
times a day at 0:00 a.m., 1:00 a.m., 2:00 a.m., 3:00 a.m., and 4:00 a.m. For more
information, see “About Auto Receive”.

• 

Manual Receive
Manual receive lets you start time calibration signal reception with the press of a
button. For more information, see “To perform manual receive”.

Important!

• 

When getting ready to receive the time calibration signal, position the watch as
shown in the nearby illustration, with its 12 o’clock side facing towards a window.
Make sure there are no metal objects nearby.

• 

The watch should not be on its side or facing the wrong way.

Resin Band

Metal Band

Inside or
among
buildings

Inside a
vehicle

Near
household
appliances,
office
equipment,
or a mobile
phone

Near a
construction
site, airport, or
other sources
of electrical
noise

Near high-
tension
power lines

Among or
behind
mountains

• 

Proper signal reception can be difficult or even impossible under the conditions listed
below.

Summary of Contents for QW-2812

Page 1: ...SERVICE MANUAL PARTS LIST WITHOUT PRICE QW 2812 MODULE NO R REF NO S M 848 FEB 2004 WVH 500D Ver 1 Apr 2004 ...

Page 2: ...GRAM 7 3 2 CIRCUIT DIAGRAM 8 3 3 CHECKING TERMINALS AND COMPONENTS 9 4 EXPLODED VIEW MODULE QW 2812 10 5 PARTS LIST MODULE QW 2812 11 6 PRECAUTIONS FOR REPAIR MODULE QW 2812 6 1 AC ALL CLEAR AND REMOVING OF MODULE 12 6 2 ACCURACY CHECKING 12 6 3 SOLAR CELL PCB ASS Y CONTACT CHECKING 13 7 TROUBLESHOOTING MODULE QW 2812 14 ...

Page 3: ...te time received display Time Calibration Signal Receivable Time Calibration Signals Mainflingen Germany Call Sign DCF77 Frequency 77 5kHz e DATE MEMORY Meomory capacity Up to 40 records for Internet access codes and other data when there are 7characters per record actual number of records depends on the number of characters per record World Time 29 time zones 30 cities daylight saving time on off...

Page 4: ... watch in an area that is outside of the range of the transmitter in Mainflingen you need to manually adjust the time as required See Timekeeping for information about manual settings To set your Home City 1 In the Timekeeping Mode hold down A until the city code starts to flash which indicates the setting screen 2 Use D east and B west to select the city code you want to use as your Home City The...

Page 5: ... ERR appears on the display for about one or two minutes After that the watch returns to the Timekeeping Mode You can also change from the last signal or ERR screen to the normal timekeeping screen by pressing D To turn auto receive on and off 1 In the Timekeeping Mode hold down A until the city code starts to flash which indicates the setting screen 2 Press C twice to move the flashing to the aut...

Page 6: ...e CLR appears to indicate that the record is being deleted After the record is deleted the cursor appears on the display ready for input 4 Input data or press A to return to the remaining memory screen Stopwatch The stopwatch lets you measure elapsed time split times and two finishes The display range of the stopwatch is 99 minutes 59 99 seconds The stopwatch continues to run restarting from zero ...

Page 7: ...this World Time Mode times will not be correct if you do not select the proper Home City code before setting the time and date in the Timekeeping Mode To set the current time and date manually 1 In the Timekeeping Mode hold down A until the city code starts to flash which indicates the setting screen 2 Use A or C to move the flashing in the sequence shown below to select other settings City code S...

Page 8: ... s built in full automatic calendar makes allowances for different month lengths and leap years Once you set the date there should be no reason to change it except after you have the watch s battery replaced or when battery power drops to Level 4 The current time for all city codes in the Timekeeping Mode and World Time Mode is calculated in accordance with the Greenwich Mean Time GMT differential...

Page 9: ...Y0 X5Y0 X6Y0 X7Y0 X8Y0 X14Y1 X13Y1 X12Y1 X11Y1 X10Y1 X9Y1 X0Y1 X1Y1 X2Y1 X3Y1 X4Y1 X5Y1 X6Y1 X7Y1 X8Y1 X14Y2 X13Y2 X12Y2 X11Y2 X10Y2 X9Y2 X0Y2 X1Y2 X2Y2 X3Y2 X4Y2 X5Y2 X6Y2 X7Y2 X8Y2 X14Y3 X13Y3 X12Y3 X11Y3 X10Y3 X9Y3 X0Y3 X1Y3 X2Y3 X3Y3 X4Y3 X5Y3 X6Y3 X7Y3 X8Y3 X14Y4 X13Y4 X12Y4 X11Y4 X10Y4 X9Y4 X0Y4 X1Y4 X2Y4 X3Y4 X4Y4 X5Y4 X6Y4 X7Y4 X8Y4 LC2 LC1 L38 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12 L13 L14 L15 ...

Page 10: ...sed in this module LSI TOTAL 106PINS BONDING 81PINS GND VDD2 BAT VCH VDD3 VC1 VC2 C3 C2 C5 XTB Xtal L3 L38 LC1 LC5 LCD 2 8V 1 3b 1 5d LD1 S1 VDD1 C1 BD C8 LL1 Tr1 XT T1 T2 T3 KI1 KI2 KI3 KI4 KI5 KI6 KI7 KI8 KI9 S2 SCR SCIN RP1 RP2 Cp PZ VDSP C4 VC3 VC4 Di1 VHF C6 AC T4 KC4 KC3 KC2 KC1 R1 R2 VSC C7 SC C9 R3 Z VPM Di2 R1 Rb GNDB S3 S4 SDO SCK CSB SDI N1 N2 Cxt Rxt2 Ccp Cbat Rbat Xtal2 ISB ANT Rcp Rx...

Page 11: ... CLF1 KI3 KI3 VOUT R2 LD1 VSC R3 KI9 KI2 KI3 VDSP SD0 VC1 P14 VCH R1 GND P2 P1 VDD2 KI1 KI4 FET S AC KC1 Transistor Tr1 Inverter INV Resistor Chip RP1 Resistor Chip RP2 Coil LL2 Coil LL1 Capacitor Chip Cel Xtal1 4 Oscillator Crystal 7110 6336 Xtal2 Oscillator Crystal Resistor Chip Rxt2 Varistor Z Resistor Chip R1 Capacitor Chip C8 Capacitor Chip C9 Capacitor Chip C1 Capacitor Chip C2 Capacitor Chi...

Page 12: ...1014 2487 19 1008 2129 9 1013 5138 13 7207 8349 14 7207 8470 16 1013 5139 20 1013 5135 17 1013 5134 12 7228 0364 15 1013 4221 11 1014 0782 14 7207 8470 14 7207 8470 5 1006 5657 Battery Storage CTL1616 2 1013 5055 21 1013 5136 8 1013 5052 18 1000 3815 7 1008 2184 6 1009 7687 ...

Page 13: ...LATOR CRYSTAL CFS 145LM07 QW 2812YC 01 1 B 5 1006 5657 BATTERY STORAGE CTL1616 QW 2812YC 01 1 B 6 1009 7687 CUSHION 2549 Q470646 1 QW 2812YC 01 1 C 7 1008 2184 CUSHION 2709 2 Q469841 1 QW 2812YC 01 1 C 8 1013 5052 CUSHION 2815 RJQ515128 001V01 QW 2812YC 01 1 C 9 1013 5138 HOLDER RJQ514979 001V01 QW 2812YC 01 1 C 10 1014 2487 INTERCONNECTOR RJQ517008 001V01 QW 2812YC 01 1 C 11 1014 0782 LABEL RJQ51...

Page 14: ... switching the module to ACCURACY CHECKING MODE The operations are shown below A SWITCHING TO ACCURACY CHECKING MODE While pressing the D button press A and C buttons at the normal timekeeping mode Then all the segments are displayed and the LCD drive signals are changed to the static drive signal of 32 Hz so that you can check the accuracy with the quartz timer B CANCELLATION OF THE ACCURACY CHEC...

Page 15: ...e the watch on the desk 2 Check the display indicates as figure 2 3 Display side down and place the watch on the desk more than two seconds Or go to a dark room and place the watch more than two seconds 4 Check the display indicates as figure 3 If 88 is not appeared on the display disassemble again the module and check the contact spring between the Solar cell and PCB 3 To exit from TEST mode Pres...

Page 16: ...Home City code is selected correctly To perform MANUAL time calibration signal reception OK There is a possibility of location bad To perform AUTO time calibration signal reception Replace the PCB ass y Signal reception OK Signal reception OK Signal reception OK Replace the Case center ass y with antenna Signal reception OK OK OK OK ...

Page 17: ...CASIO TECHNO CO LTD Overseas Service Division 6 2 Hon machi 1 Chome Shibuya ku Tokyo 151 8543 Japan Ver 1 Apr 2004 Addition of pages 2 3 4 5 and 6 ...

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