Casio LWQ-160DE, LWQ-160LE Service Manual & Parts List

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Page 1

ERVICE

ANUAL

& PARTS LIST

MODULE NO.

QW-4791

REF. NO. S/M-998

AUG. 2007

LWQ-160DE

LWQ-160LE

Ver.1 : May. 2008

(WITHOUT PRICE)

Page 2

CONTENTS

Page

1. SPECIFICATIONS: MODULE QW-4791 ..................................................... 1

2. DRAWINGS: MODULE QW-4791

2-1. CHECKING TERMINALS AND COMPONENTS ............................................ 2

3. EXPLODED VIEW: MODULE QW-4791 ..................................................... 3

4. PARTS LIST: MODULE QW-4791 ............................................................... 4

5. PRECAUTIONS FOR REPAIR: MODULE QW-4791

5-1. AC (ALL CLEAR) AND REMOVING OF MODULE ....................................... 6

5-2. MEASURING CURRENT CONSUMPTION ................................................... 6

5-3. ACCURACY CHECKING ............................................................................... 7

5-4. TIME CALIBRATION SIGNAL TEST MODE .................................................. 8

APPENDIX

Operation Guide 4791

Page 3

1. SPECIFICATIONS: MODULE QW-4791

Item Detail

Battery

Battery life

Current consumption

Alarm system

Accuracy

Accuracy setting system

Accuracy checking

Functions:

ESR920W

Approx. 2 years

0.24 µA maximum:µA maximum

See page 6

±20 sec./month

Chip capacitor selection

See page 7

• Time calibration signal reception

Auto receive

Manual receive

• Time Calibration Signal

Receivable Time Calibration Signals

Fort Collins, Colorado (Call Sign: WWVD, Frequency : 60kHz)

Rugby, England (Call Sign: MSF, Frequency: 60kHz)

Mainﬂingen, Germany (Call Sign: DCF77, Frequency: 77.5kHz)

Fukushima, Japan (Call Sign: JJY, Frequency: 40kHz)

Fukuoka/Saga, Japan (Call Sign: JJY, Frequency: 60kHz)

• Regular timekeeping:

Analog: 3 hands (Hour, minutes, seconds)

— 1 —

Page 4

2. DRAWINGS: MODULE QW-4791

DIO13

DIO7

DIO6

VOSC

GND

XTB

VCH GND

VOSC

GND

VDD2

GND

PM_RES

DIO4

VDD2

VCH

DIO3

DIO13

DIO7

SCR

GND

DIO5

VSC

DIO2

DIO1

SCIN

VCC

GND

VSC

GND

DIO14

GND

GNDB

P2'

FET-D

GNDB

GND

VOSC

VDD2

DIO4

P2'

P1' P1'

FET-S'

P1'

P2'

FET-S

VCC

VSC

P1'

FET-S'

VDD2

DIO1

SCIN

GND

SCR

DIO2

GND

Ccp

VSC

VDD2

DIO12

DIO3

VCH

PM_RES

GND

SCIN

SCI

OSCILLATOR/CRYSTAL

2. PCB ASS'Y (76410798)

TAPE/ADHESIVE 2306

Short pad for switching modules D1014-GND: Open (No Soldering) D1013-GND: Short (Soldering)

2-1. CHECKING TERMINALS AND COMPONENTS

— 2 —

Page 5

3. EXPLODED VIEW: MODULE QW-4791

17 (72270294)

2 (76410798) PCB ass'y

8 (10212747)

9 (10209123)

18 (10209118)

1 (76409228)

12 (10209124)

11 (10009244)

15 (10212751)

13 (10234346)

6 (10212752)

3 (19101199)

Battery storage (ESR920W)

5 (10209109)

16 (10212748)

13 (10234346)

7 (10237097)

14 (10212750)

10 (10140782)

4 (10209108)

11 (10009244)

— 3 —

Page 6

4. PARTS LIST: MODULE QW-4791

pply

(

)

(+)

W-4791A

1QW-4791AT-01

Note: 1. Prices and specifications are subject to change without prior notice.

2. S

are parts are classified as follows according to their importance in after-sales service.

Rank -----------------------------------------Important

C Rank ----------------------------------------

3. Batteries in Bulk Batteries in Blister

4. As for order/su

ttention to order

1. The most of normal re

2. Minor

3. Main similar models.

MAIN PARTS

Item Code No. Parts Name S

arts should be ordered carefully in consideration of the actual usage of your repair and your technical skills.

arts should be ordered and stocked appropriately in consideration of your parts usage anre repair usage for

76410781 MODULE/WITH MOVEMENT QW-4791AT-01TK 1

1 76409228ANALOG BLOCK QW-4323MV-82TK 1

ack on the tray will be supplied from our Overseas Spare Parts Section under charge basis.

ack will be supplied from our Sales Department.

of spare parts, refer to the separate publication "GUIDE BOOK for spare parts supply".

air or initial repair within 1year since released month can be done by main parts.

RJQ528359*001V01

Not Important

ecification Q'TY R

2 76410798 PCB ASS'

MINOR PARTS

Item Code No. Parts Name S

3 19101199 BATTERY/STORAGE ESR920W 1 C

4 10209108 COIL ASS'Y 4323-1 RJQ526939*001V02 1 C

5 10209109 COIL ASS'Y 4323-2 RJQ526940*001V02 1 C

6 10212752 CUSHION 4323-1 RJQ527451-001V01 1 C

7 10237097 CUSHION 4323-2 RJQ527452-001V02 1 C

8 10212747 HOLDER 4323 RJQ527417-001V01 1 C

9 10209123 HOLDER RJQ526931-001V01 1 C

/HOUR WHEEL 4323

10 10140782 LABEL 2815 RJQ517198-001V02 1 C

11 10009244 SCREW 2323 Q465649-1 3 C

12 10209124 SCREW 4323 RJQ526942-001V01 2 C

RJQ538072*001V01TK 1

ecification Q'TY R

13 10234346 SCREW 4329 RJQ532242-001V01 2 C

14 10212750 SHEET/INSULATION 4323-2 RJQ527449-001V01 1 C

15 10212751 TAPE/ADHESIVE 4323 RJQ527454-001V01 1 C

16 10212748 TERMINAL/BATTERY

Notes: R - Rank

A: Important C: Not Im

ortant

4323 RJQ527422-001V01 1 C

— 4 —

Page 7

Item Code No. Parts Name Specification Q'TY R

17 72270294 WASHER 745 Q436294A-1 1 C

18 10209118 WHEEL/HOUR 4323 RJQ527219-001V01 1 C

For the prices and minimum order/supply quantities of the above parts, refer to the Parts Price List P.P.L.-645.

Notes: R - Rank

A: Important C: Not Im

ortant

— 5 —

Page 8

5. PRECAUTIONS FOR REPAIR: MODULE QW-4791

5-1. AC (ALL CLEAR) AND REMOVING OF MODULE

1. Perform AC (ALL CLEAR) when inserting a new battery, or else the memories and/ or counters may give erratic displays.

Touch the AC contact and the main plate with the metallic tweezers.

The contact should be made for about two seconds.

2. On removing of the module from the case, please insert the precision screw driver between the

module and the case pointed by an arrows.

Note: hand home position adjustment mode at the home position adjustment mode.

After performing AC(ALL CLEAR), the mode is switched to the second hand and the indicator

Metallic tweezers

5-2. MEASURING CURRENT CONSUMPTION

This model starts correct positioning of the second hand in the H-SET mode immediately after AC.

When it is functioning, the value of consumption current would be a little higher as the internal circuit operation would be different from the usual status.

To measure a correct consumption current value, operate as follows.

Hold down  and turn on the AC, and then let  go. * After the operation above is ﬁnished, measure within one minute.

* Supply voltage is 1.5V.

— 6 —

Page 9

5-3. ACCURACY CHECKING

Timekeeping Mode

Press A once, and then press B twice while holding down A.

TEST MODE

Accuracy Checking Mode

4 o'clock

position

4 o'clock

position

Indicated the last

receiving stationis

Signal Receiving

st Mode

* While displaying the reception result in the test mode, press the A button.

Module confirmation Mode

(units digit)

Module confirmation Mode

(tens place digit)

Indicated with the second hand.

× 2

1. Module conﬁrmation mode

1) Press the  button in the Normal Timekeeping Mode to display the result of the signal receiving test.

2) In the Signal Receiving Test Result Mode, press the  button twice while holding down the  button to display the version of the Accuracy Checking Mode.

3) The version is indicated with the second hand. Press the  button once to display the tens place digit of the version; press it once more to display the units digits of the version.

QW-4791: “44”

1) Press  button at the module conﬁrmation mode to enter the accuracy checking mode.

2) Second hand shows performing to test the rate of clock.

3) Press  button at the Accuracy checking mode to go back to the normal timekeeping mode.

2. Accuracy checking mode

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Page 10

5-4. TIME CALIBRATION SIGNAL TEST MODE

1) In the Accuracy Checking Mode, press the  button twice to switch to the signal receiving standby state.

(The last receiving station is indicated with the second hand.)

If the last receiving station is reset with the [All Clear] function, the station to ﬁrst receive the signal

is indicated.

(JJY40:4sec, JJY60:6sec, WWVB:8sec, MSF:14sec, DCFF:16sec)

2) Press the  button to switch to the Signal Receiving Sensitivity Test Mode.

3) Press the  button to select the receiving station, and then press the  button to start receiving the signal.

The second hand will move to the READY (33-second) position.

4) The result of the signal reception will be indicated after a while.

Signal recieving department

JJY40 1 o’clock 11 o’clock JJY60 2 o’clock 10 o’clock

WWVD 3 o’clock 9 o’clock

DCF77 4 o’clock 8 o’clock

MSF 5 o’clock 7 o’clock

The result of the signal reception

Success failure

— 8 —

Page 11

Operation Guide 4791

MO0705-EA

Getting Acquainted

Congratulations upon your selection of this CASIO watch. To get the most out of your purchase, be sure to read this manual carefully.

If all the analog hands are stopped at 12 o’clock...

To conserve battery power, the watch is shipped from the factory with its functions disabled. All the watch’s analog hands are stopped at 12 o’clock. To activate the watch’s functions, press either of the two buttons. This will cause the analog hands to move to the current time setting.

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.

Hour hand

Minute hand

Second hand

General Guide

• This watch is designed so the function of a button is executed when you release the button, not when you press it.

• Use A and B to change from mode to mode as shown below.

Press A.

▲

Timekeeping Mode

Receive Result Mode

Home Position

Adjustment Mode

▲

Press A twice.

Hold down A and B for about five seconds.

Manual Receive

Press any button.

▲

Hold down A for about two seconds.

▲

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 switches automatically between Standard Time and Daylight Saving Time in accordance with the time calibration signal it receives. There is no indicator showing whether the time currently shown by the watch is Standard Time or Daylight Saving Time.

• This watch is designed to pick up the time calibration signal transmitted in Germany (Mainflingen) and England (Rugby).

• See the information under “Signal Reception Troubleshooting” if you experience problems with time calibration signal reception.

Current Time Setting

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

• The first thing you should do after purchasing this watch is to specify a GMT differential, which is the time differential between GMT and the location where you normally will use the watch. For more information, see “To specify a GMT differential” below.

• When using the watch outside the range of the Germany and England time signal transmitters, you have to adjust the current time setting manually as required. See “Timekeeping” for more infor mation about manual time settings.

To specify a GMT differential

1. In the Timekeeping Mode, hold down B for about five

seconds until the second hand moves to the currently selected GMT differential setting and stops. This is the setting mode.

• The GMT differential value indicates the time difference in hours from Greenwich Mean Time.

2. Use A to move the second hand to the GMT

differential setting you want to use.

GMT +0 (12 o’clock): London GMT +1 (1 o’clock): Paris, Berlin, Milan, Rome,

Amsterdam, Hamburg, Frankfurt, Vienna, Barcelona, Madrid

GMT +2 (2 o’clock): Athens

3. Press B to exit the setting mode.

• The watch also will return to the Timekeeping Mode if you do not perform any operation for about two or three minutes.

GMT differential value (+0)

GMT differential value (+1)

GMT differential value (+2)

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

• Even if the time calibration signal is received correctly, there are some times when the analog hands may not indicate the correct time. If this happens, use the procedures under “Adjusting the Home Positions” to check the home positions of the hands, and make adjustments as required.

• The watch will receive the time calibration signal automatically from the applicable transmitter (in the middle of the night) and update its settings accordingly. For information about the relationship between GMT differential values and transmitters, see “Transmitters”.

• See the maps under “Reception Ranges” for infor mation about the reception ranges of the watch.

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 receives the time calibration signal automatically up to six times a day. When any auto receive is successful, the remaining auto receive operations are not performed. For more infor mation, see “About Auto Receive”.

• Manual Receive

Manual receive lets you start a time calibration receive operation with the press of a button. For more infor mation, 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.

12 o’clock

• Make sure the watch is facing the right way.

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

below.

• Signal reception normally is better at night than during the day.

• Time calibration signal reception takes from two to seven minutes, but in some

cases it can take as long as 14 minutes. Take care that you do not perform any button operations or move the watch during this time.

Inside or among buildings

Inside a vehicle

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

Near hightension power lines

Among or behind mountains

Near household appliances, office equipment, or a mobile phone

• When within range of the applicable transmitter, this watch can receive either the Germany (Mainflingen) or England (Rugby) time calibration signals. See “Transmitters” for more information.

Reception Ranges

Rugby

Mainflingen

1,500 kilometers

500 kilometers

• At distances further than about 500 kilometers from a transmitter, signal reception may not be possible during certain times of year or times of day. Radio interference also may cause problems with reception.

• Even when the watch is within the reception range of the transmitter, signal reception will be impossible if the signal is blocked by mountains or other geological formations between the watch and signal source.

• Signal reception is affected by weather, atmospheric conditions, and seasonal changes.

Page 12

Operation Guide 4791

About Auto Receive

The watch receives the time calibration signal automatically up to six times a day. When any auto receive is successful, the remaining auto receive operations are not performed. The reception schedule (calibration times) depends on the currently selected GMT differential, and whether standard time or Daylight Saving Time is selected for it.

GMT Differential Auto Receive Start Times

123456

GMT +0 Standard Time 1:00 am 2:00 am 3:00 am 4:00 am 5:00 am Midnight

Daylight 2:00 am 3:00 am 4:00 am 5:00 am Midnight 1:00 am Saving Time next day

GMT +1 Standard Time 2:00 am 3:00 am 4:00 am 5:00 am Midnight 1:00 am

next day

Daylight 3:00 am 4:00 am 5:00 am Midnight 1:00 am 2:00 am Saving Time next day next day

GMT +2 Standard Time 3:00 am 4:00 am 5:00 am Midnight 1:00 am 2:00 am

next day next day

Daylight 4:00 am 5:00 am Midnight 1:00 am 2:00 am 3:00 am Saving Time next day next day next day

Note

• The auto receive operation is performed only if the watch is in the Timekeeping Mode when one of the calibration times is reached. It is not performed if a calibration time is reached while you are configuring settings.

• Auto receipt of the calibration signal is designed to be performed early in the morning, while you sleep (provided that the Timekeeping Mode time is set correctly). Before going to bed for the night, remove the watch from your wr ist, and put it in a location where it can receive the signal easily.

• The watch receives the calibration signal for two to seven minutes everyday when the time in the Timekeeping Mode reaches each of the calibration times. Do not perform any button operation within seven minutes before or after any one of the calibration times. Doing so can interfere with correct calibration.

• Remember that reception of the calibration signal depends on the current time in the Timekeeping Mode. The receive operation will be performed whenever the display shows any one of the calibration times, regardless of whether or not the displayed time actually is the correct time.

To perform manual receive

1. Place the watch on a stable surface so its 12 o’clock side is facing towards a window.

2. In any mode, hold down A for about two seconds until the second hand moves to READY (R).

• This indicates that the watch is getting ready to receive

the time calibration signal.

• The second hand will move to WORK (W) and stay there

while actual reception is in progress.

• The hour and minute hands continue to keep time

normally.

• Time calibration signal reception takes from two to

seven minutes, but in some cases it can take up to 14 minutes. Take care that you do not perform any button operations or move the watch during this time.

• If reception is successful, the second hand will move to

Y (YES). One or two minutes later, the hands will move to the correct time.

WORK

READY

Note

• To interrupt a receive operation and return to the Timekeeping Mode, press any button.

• If reception is not successful, the second hand will move to N (NO). One or two minutes later, the second hand will resume normal operation, without any adjustment of the hand setting.

• If the second hand is pointing to Y (YES) or N (NO), you can return to the Timekeeping Mode by pressing any button.

Viewing the Latest Signal Reception Results

You can use the Receive Result Mode to check if signal reception was performed correctly.

To check the latest signal reception results

Enter the Receive Result Mode.

• If the watch was able to perform a successful signal receive operation since midnight, the second hand will move to Y (YES). If the watch has been unable to receive any signal successfully, the second hand will move to N (NO).

• To return to the Timekeeping Mode, press A.

• The current receive result is cleared when the first auto

receive operation is performed on the following day. This means Y (YES) indicates successful signal reception since the start of the current day.

• If you have adjusted the time setting manually, the second hand will indicate N (NO) here.

Signal Reception Troubleshooting

Check the following points whenever you experience problems with signal reception.

•

You changed the time setting manually.

•

Manual signal reception failed for some reason.

•

The watch was not in the Timekeeping Mode, or you performed some button operation during the auto receive operation.

•

Signal reception results are reset at midnight each day.

• The GMT differential setting is not correct for the area where you are using the watch.

The second hand is pointing at N (NO).

Time setting is incorrect following signal reception.

• Perform manual signal receive or wait until the next auto signal receive operation is performed.

• Check to make sure the watch is in a location where it can receive the signal.

• Select the correct GMT differential.

What you should doProblem Probable Cause

• For further information, see “Important!” under “Time Calibration Signal Reception” and “Radio-controlled Timekeeping Precautions”.

Adjusting the Home Positions

If the time settings are wrong even after the time calibration signal is received normally, use the following procedure to adjust their home positions.

To adjust the home positions

1. Enter the Home Position Adjustment Mode.

• If the home position of the second hand currently is correct, it will move to the 12 o’clock position.

• The analog hands do not keep time during home position adjustment.

2. Check the position of the second hand.

• The second hand home position is correct if it is pointing at 12 o’clock.

• If the second hand is not pointing at 12 o’clock, it means that its home position is off. If this happens, press B to move the second hand clockwise in onesecond steps, until it points at 12 o’clock.

3. Press A to advance to hour and minute hand home

position adjustment.

12 o’clock

Correct second hand home position

• If current hour and minute hand alignment is correct, they will both move to 12 o’clock.

4. Check the position of the hour and minute hands.

• If the hour and minute hands are not pointing at 12 o’clock, it means that their home position is off. If this happens, press B to move the hour and minute hands clockwise in 10-second steps, until they point at 12 o’clock.

5. Press A to exit home position adjustment.

• This will cause the watch to return to the Timekeeping Mode. The hour, minute and second hands will indicate the current time.

• Note that all button operations are disabled while the hour and minute hands are moving.

• After you complete the home position adjustment procedure, place the watch in a location that allows good time calibration signal reception, and then perform a manual receive operation. See “To perform manual receive” for more infor mation.

Correct hour and minute hand home position

12 o’clock

Timekeeping

Use the Timekeeping Mode to set and view the current time. This section also explains how to set the current time manually.

• If you become confused and lose your way during the following procedures, simply put the watch down and do not perform any button operation for two or three minutes. This will cause the watch to enter the Timekeeping Mode (indicated by normal one-second movement of the second hand) automatically. After that, you can try performing the manual setting procedure again from the beginning.

Hour hand

Minute hand

Second hand

To adjust the time setting manually

1. In the Timekeeping Mode, hold down A for about five

seconds.

• This operation causes the second hand to move to AM or PM in accordance with the current time setting. This is the

setting mode.

• The hour and minute hands do not move in the setting mode.

2. Press B to move the time setting forward by one minute.

• Holding down B for about two seconds starts high-speed hand movement. High-speed hand movement will continue until the hands complete a 12-hour cycle, or until you stop them by pressing B.

• If you exit the setting mode after changing the time setting, the second hand will restart timing from 12 o’clock (0 seconds) automatically.

• The AM/PM setting will not change even if you move the hour hand past 12 o’clock in step 2. Use step 3 below to switch between AM and PM.

3. Press A to advance to AM/PM switching.

• This will cause the second hand to perform one full rotation starting from its current position (either AM or PM), and then stop at its original current position.

4. Press B to toggle the second hand between AM and PM.

5. Coordinating with a time signal on the radio or TV, press A to restart nor mal

timekeeping. The second hand will move to 12 o’clock (zero seconds) at the start of timekeeping.

• If you press A without changing the time setting (hour, minute, AM/PM), the second

hand will move to the current time position and timekeeping will resume from there.

• This watch normally receives a time calibration signal late at night. However, if you configure the wrong AM/PM setting in step 3 of the above procedure, the watch will start signal reception automatically during the afternoon. Signal reception during the day is not as good as nighttime reception, so a wrong AM/PM setting can cause signal reception problems.

Reference

This section contains more detailed and technical information about watch operation. It also contains important precautions and notes about the various features and functions of this watch.

Auto Return Features

• If you leave the watch in the Home Position Adjustment Mode and Receive Result Mode for two or three minutes without performing any operation, it will return to the Timekeeping Mode automatically.

• If you do not perform any operation for about two or three minutes while a setting mode is selected, the watch will exit the setting mode automatically.

High-speed Hand Movement

• The B button is used to change the hand setting in various setting modes. In most cases, holding down the B button will start high-speed movement of the applicable hand(s).

• High-speed movement of the hands will continue until it completes a 12-hour cycle, or until you press any button to stop it.

Page 13

Operation Guide 4791

Radio-controlled Timekeeping Precautions

• Strong electrostatic charge can result in the wrong time being set.

• The time calibration signal bounces off the ionosphere. Because of this, such factors

as changes in the reflectivity of the ionosphere, as well as movement of the ionosphere to higher altitudes due to seasonal atmospheric changes or the time of day may change the reception range of the signal and make reception temporarily impossible.

• Even if the time calibration signal is received properly, cer tain conditions can cause the time setting to be off by up to one second.

• The current time setting in accordance with the time calibration signal takes priority over any time settings you make manually.

• If you are in an area where proper time calibration signal reception is impossible, the watch keeps time within ±20 seconds a month at normal temperature.

• If you have problems with proper time calibration signal reception or if the time setting is wrong after signal reception, check the GMT differential setting. The initial factory default GMT differential setting is GMT +1.

Transmitters

This watch is able to receive time calibration signals transmitted in Germany (Mainflingen) and England (Rugby). The following explains how the watch determines which transmitter it should check first.

When GMT differential GMT+1 or GMT+2 is selected:

In this case:

The first signal search operation after the GMT differential setting has been changed

The second and subsequent signal searches

The watch does this:

1. Checks the Mainflingen signal first.

2. If the Mainflingen signal cannot be received, checks the Rugby signal.

1. Checks the signal of the transmitter of the first receive operation (Rugby or Mainflingen).

2. If the checked signal cannot be received, checks the other signal.

In this case:

The first signal search operation after the GMT differential setting has been changed

The second and subsequent signal searches

The watch does this:

1. Checks the Rugby signal first.

2. If the Rugby signal cannot be received, checks the Mainflingen signal.

1. Checks the signal of the transmitter of the first receive operation (Rugby or Mainflingen).

2. If the checked signal cannot be received, checks the other signal.

When GMT differential GMT+0 is selected:

Timekeeping

• The current time in the Timekeeping Mode is calculated in accordance with the current Greenwich Mean Time (GMT) differential setting.

• GMT differential is calculated by this watch based on Universal Time Coordinated (UTC*) data.

* UTC is the world-wide scientific standard of timekeeping. It is based upon

carefully maintained atomic (cesium) clocks that keep time accurately to within microseconds. Leap seconds are added or subtracted as necessary to keep UTC in sync with the Earth’s rotation. The reference point for UTC is Greenwich, England.

Page 14

Ver. 1 : May. 2008

Correction of pages 1 and 6

CASIO COMPUTER CO.,LTD.

Overseas Service Division

Shibuya-ku, Tokyo 151-8543, Japan

6-2, Hon-machi 1-Chome