Casio 2168 Watch User Manual

MA0905-EC

Operation Guide 668 2168 2505

About This Manual

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

General Guide

••••• Press B to change from mode to mode.

••••• Pressing B after performing some operations in any mode returns to the

Timekeeping Mode.

••••• If you do not perform any operation for a few minutes in the Alarm Mode or

Setting Screen, the watch automatically reverts to the Timekeeping Mode.

Timekeeping Mode Alarm Mode

Press B.

Stopwatch Mode Setting Screen

Timekeeping Mode

Minutes

Hour Seconds

In the Timekeeping Mode, press C to switch between the 12-hour and 24-hour formats.

••••• When the 12-hour format is selected, the indicator PM appears on the display to indicate “P.M.” times. There is no indicator for “A.M.” times.

••••• When the 24-hour format is selected, the indicator

24H appears on the display.

••••• A charge indicator appears on the display of this watch when charging is required.

Day

Day of week

Charge indicator

PM indicator

Flashing

To set the time and date

1. Press B three times in the Timekeeping Mode to display the setting screen.

2. Press A to move the selection (flashing) in the following sequence.

Seconds Hour Minutes

Day of week Day Month

3. While the seconds setting is selected (flashing), press C to reset it to 00. If you press C while the seconds setting is in the range of 30 to 59, the seconds are reset to 00 and 1 is added to the minutes. If the seconds setting is in the range of 00 to 29, the minutes count is unchanged.

4. While any other setting is selected (flashing), press C to increase the number.

••••• Holding down C changes the setting at high speed.

5. After you set the time and date, press B to return to the Timekeeping Mode.

Alarm Mode

Minutes

Hour

When the Daily Alarm is turned on, the alarm sounds for

20 seconds at the preset time each day. When the

Hourly Time Signal is turned on, the watch beeps every hour on the hour.

To set the alarm time

1. Press A while in the Alarm Mode. The hour digits flash because they are selected.

••••• At this time the alarm is automatically turned on.

Mode indicator

Hourly time signal on indicator

Alarm on indicator

2. Press A to change the selection in the following sequence.

Daily Alarm and

Hourly Time Signal on and off

Hour Minutes

3. Press C to increase the selected digits. Holding down C changes the number at high speed.

••••• The format (12-hour and 24-hour) of the alarm time matches the format you select for normal timekeeping.

••••• When setting the alarm time using the 12-hour format, take care to set the time correctly as morning or afternoon.

To stop the alarm

••••• Press A to stop the alarm after it starts to sound.

To turn the Daily Alarm and Hourly Time Signal on and off

Press C while in the Alarm Mode to change the status of the Daily Alarm and

Hourly Time Signal in the sequence shown below.

Both ON Both OFF Daily Alarm

Only

Hourly Time

Signal Only

••••• The alarm and hourly time signal indicator is displayed in all modes.

To test the alarm

Hold down C while in the Alarm Mode to sound the alarm.

Stopwatch Mode

1/100 second

Seconds

Minutes

The Stopwatch Mode lets you measure elapsed time, split times, and two finishes. The range of the stopwatch is 59 minutes, 59.99 seconds.

Mode indicator

Elapsed time measurement

Start Stop

Split time measurement

Re-start

Start Split

Split time and 1st-2nd place times

Split release

Start

Stop

Stop

Clear

Clear

Split

First runner finishes.

Display time of first runner.

Stop

Second runner finishes.

Split release

Display time of second runner.

Clear

Power Requirements

This watch works by light energy, so no battery is necessary. Light energy is converted into electric energy by solar cells and stored into the capacitor. Once fully charged, the watch can continue to run for a number of days (Modules 668 and 2168: 4 days, Module 2505: 14 days) without being exposed to light.

■ Charging light

••••• The watch will start to work within about two seconds after it is exposed to light

(such as general office illumination). Set the time and calendar at this time.

••••• You can put on the watch after the “charge indicator ( )” disappears from the display.

••••• The beeper sound may be weak and the display may be dim while the charge indicator is on the display.

••••• Use the information in the table below as a reference how long you need to expose the watch to light when charging it.

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Operation Guide 668 2168 2505

Charging Time

Conditions

Charging Time

(until charge indicator disappears)

Modules Module

668, 2168 2505

Minimum Daily

Charge

Maximum Charging

Time

Modules Modules Module

668, 2168, 2505 668, 2168 2505

Direct sunlight

(100,000 lux.)

At a sunny window

(20,000 lux.)

Fluorescent light

(5,000 lux.)

General office illumination (700 lux.)

15 min

50 min

4 hrs

—

45 min

3 hrs

12 hrs

—

4 min

12 min

50 min

6 hrs

40 min

2 hrs

—

—

••••• Note the following to ensure that your watch remains charged and running.

* Wear the watch outside your sleeve.

* Place the watch in a well-lit location when you are not wearing it.

2 hrs

6 hrs

—

—

Specifications

Accuracy at normal temperature:

±30 seconds a month

Timekeeping Mode: Hour, minutes, seconds, p.m. (PM), day of the week, day

Time system: Switchable between 12-hour and 24-hour formats

Calendar system: Auto-calendar set at 28 days for February

Alarm Mode: Daily alarm, hourly time signal

Stopwatch Mode: Measuring unit: 1/100 of a second

Measuring capacity: 59 minutes, 59.99 seconds

Measuring modes: Elapsed time, split time and two finishes

Charge Storage: Coin type capacitor

Days to Discharge: Modules 668 and 2168: 4 days

Module 2505: 14 days

(Above values are from full charge to stopping of watch operation, based on 20 seconds of alarm and 24 Hourly

Time Signals per day.)

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