Manual Casio 2687 (page 4 of 5) (English)

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Operation Guide 2607 2637 2687

To turn the auto light switch on and off

In any mode, hold down L for about two seconds to toggle the auto light switch on

(auto light switch on indicator displayed) or off (auto light switch on indicator not

displayed).

• The auto light switch on indicator is on the display in all modes while the auto light

switch is turned on.

Battery

This watch is equipped with a solar cell and a rechargeable battery (secondary

battery) that is charged by the electrical power produced by the solar cell. The

illustration shown below shows how you should position the watch for charging.

Example: Orient the watch so its face

is pointing at a light source.

• Note that charging efficiency drops

when any part of the solar cell is

blocked by clothing, etc.

• The illustration shows how to position

a watch with a resin band.

Important!

• Storing the watch for long periods in an area where there is no light or wearing it in

such a way that it is blocked from exposure to light can cause rechargeable battery

power to run down. Be sure that the watch is normally exposed to bright light

whenever possible.

Solar cell

• This watch employs a solar cell that converts light into electricity that charges a built-

in rechargeable battery. Normally, the rechargeable battery should not need

replacement, but after very long use over a number of years, the rechargeable

battery may lose its ability to achieve a full charge. Should you notice problems with

getting the rechargeable battery to a full charge, contact your dealer or CASIO

distributor about having the rechargeable battery replaced.

• The rechargeable battery should be replaced with a CASIO-specified CTL1616

battery only. Other rechargeable batteries can cause damage to the watch.

• All data stored in memory is deleted, and the current time and all other settings

return to their initial factory defaults whenever battery power drops to Level 4 and

when you have the battery replaced.

• Turn on the watch’s Power Saving function and keep it in an area normally exposed

to bright light when storing it for long periods. This helps to keep the rechargeable

battery from going dead.

Battery Power Indicator

The battery power indicator on the display shows you the current status of the

rechargeable battery’s power.

Battery power

indicator

Recover

indicator

Level

Battery Power Indicator

Charge Soon Alert

Function Status

All functions enabled.

Beeper tone, backlight,

calibration signal

reception, display, and

buttons are disabled.

All functions, including

timekeeping, are

disabled.

Module 2607 2637 2687

• The Level 3 charge warning indicator tells you that battery power is very low, and

that exposure to bright light for charging is required as soon as possible.

• At Level 4, all functions are disabled and settings return to their initial factory

defaults. Functions are enabled once again after the rechargeable battery is

charged, but you need to set the time and date after the battery reaches Level 3

from Level 4. You will not be able to configure any of the other settings until the

battery reaches Level 2 after dropping to Level 4.

• Leaving the watch in direct sunlight or some other very strong light source can

cause the battery power indicator to temporarily show a reading that is actually

higher than the battery level. The correct battery power indicator should appear after

a few minutes.

• If you use the backlight or the alarms a number of times during a short period, the

recover indicator (R

/RECOVER ) appears on the display and the following

operations become disabled until battery power recovers.

Backlight

Beeper tone

Calibration reception

After some time, battery power will recover and the recover indicator (R /

RECOVER

) will disappear, indicating that the above functions are enabled again.

Charging Precautions

Certain charging conditions can cause the watch to become very hot. Avoid leaving

the watch in the areas described below whenever charging its rechargeable battery.

Also note that allowing the watch to become very hot can cause its liquid crystal

display to black out. The appearance of the LCD should become normal again when

the watch returns to a lower temperature.

Warning!

Leaving the watch in bright light to charge its rechargeable battery can cause it

to become quite hot. Take care when handling the watch to avoid burn injury.

The watch can become particularly hot when exposed to the following

conditions for long periods.

• On the dashboard of a car parked in direct sunlight

• Too close to an incandescent lamp

• Under direct sunlight

Charging Guide

After a full charge, timekeeping remains enabled for up to about six months, while the

watch is used under the conditions described below.

Operating Conditions

•

Watch is not exposed to light

•

Display on 18 hours per day, sleep state 6 hours per day

•

1 backlight operation (1.5 seconds) per day

•

10 seconds of alarm operation per day

•

4 times calibration reception per day

Charge Times

Exposing the watch to light for the periods shown below each day restores the power

used by the above operating conditions.

• Stable operation is promoted by frequent charging.

Recovery Times

The table below shows the amount exposure that is required to take the battery from

one level to the next.

Exposure Level (Brightness) Approximate

Exposure Time

Outdoor Sunlight (50,000 lux) 5 minutes

Sunlight Through a Window (10,000 lux) 24 minutes

Daylight Through a Window on a Cloudy Day (5,000 lux) 48 minutes

Indoor Fluorescent Lighting (500 lux) 8 hours

Exposure Level

(Brightness)

Outdoor Sunlight

(50,000 lux)

Sunlight Through a

Window (10,000 lux)

Daylight Through a

Window on a Cloudy

Day (5,000 lux)

Indoor Fluorescent

Lighting (500 lux)

Approximate Exposure Time

Level 4 Level 3 Level 2 Level 1

1 hour 14 hours 3 hours

3 hours 70 hours 14 hours

5 hours 143 hours 28 hours

57 hours ------------ ------------

▲

• The above exposure time values are all for reference only. Actual required exposure

times depend on lighting conditions.

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 Time Recorder Mode or Alarm Mode for two or three

minutes without performing any operation, it automatically returns to the

Timekeeping Mode.

• If you leave a screen with flashing digits on the display for two or three minutes

without performing any operation, the watch automatically saves anything you have

input up to that point and exits the setting screen.

Data and Setting Scrolling

The B and D buttons are used in various modes and setting screens to scroll

through data on the display. In most cases, holding down these buttons during a scroll

operation scrolls through the data at high speed.

Initial Screens

When you enter the Alarm or World Time Mode, the data you were viewing when you

last exited the mode appears first.

Time Calibration Signal Reception Precautions

• Reception is best when the antenna built into the 12 o'clock edge of the watch is

facing in the general direction of the signal transmitter. Note, however, that moving

the watch while the time calibration signal receive operation is taking place will make

stable reception impossible.

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

below.

• Radio interference can make signal reception impossible.

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

• Even when the watch is within the reception range of the transmitter, signal

reception is impossible if the signal is blocked by mountains or other geological

formations between the watch and signal source.

Inside or

among

buildings

Inside a

vehicle

Near

household

appliances or

office

equipment

Near a

construction

site, airport, or

other sources

of electrical

noise

Near high-

tension

power lines

Among or

behind

mountains

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

changes.

• The time calibration signal is bounced 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.

• The watch is designed to automatically update the date and day of the week for the

period January 1, 2000 to December 31, 2099. Setting of the date by the time

calibration signal cannot be performed starting from January 1, 2100.

• This watch can receive signals that differentiate between leap years and non-leap

years.

• If you are in an area where proper time calibration signal reception is impossible, the

watch keeps time within ±15 seconds a month at normal temperature.

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Casio 2687 User Manual - German - 6 pages

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Casio 2687 Manual

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