Manual Casio 3185 - GF-1000 (page 6 of 8) (English)

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Operation Guide 3185

E-50

About the Auto Light Switch

Turning on the auto light switch causes illumination to turn on, whenever you position

your wrist as described below in any mode. Note that this watch features a “Full Auto

EL Light,” so the auto light switch operates only when available light is below a certain

level. It does not turn on the backlight under bright light.

Moving the watch to a position that is parallel to the ground and then tilting it towards

you more than 40 degrees causes illumination to turn on.

• Wear the watch on the outside of your wrist.

Parallel to

ground

More than 40°

E-51

Warning!

••

• Always make sure you are in a safe place whenever you are reading the

display of the watch using the auto light switch. Be especially careful when

running or engaged in any other activity that can result in accident or injury.

Also take care that sudden illumination by the auto light switch does not

startle or distract others around you.

••

• When you are wearing the watch, make sure that its auto light switch is turned

off before riding a bicycle or operating a motorcycle or any other motor

vehicle. Sudden and unintended operation of the auto light switch can create a

distraction, which can result in a traffic accident and serious personal injury.

To turn the auto light switch on and off

In the Timekeeping Mode, hold down B for about three seconds to toggle the auto

light switch on (auto light switch on indicator displayed) and 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.

E-52

Power Supply

This watch is equipped with a solar cell and a rechargeable 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.

• The illustration shows how to position a

watch with a resin band.

• Note that charging efficiency drops when

any part of the solar cell is blocked by

clothing, etc.

• You should try to keep the watch outside of

your sleeve as much as possible. Charging

is reduced significantly even if the face is

covered only partially.

Solar cell

E-53

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. Make sure that the watch is exposed to bright light whenever

possible.

• This watch uses a rechargeable battery to store power produced by the solar cell, so

regular battery replacement is not required. However, after very long use, the

rechargeable battery may lose its ability to achieve a full charge. If you experience

problems getting the rechargeable battery to charge fully, contact your dealer or

CASIO distributor about having it replaced.

• Never try to remove or replace the watch’s rechargeable battery yourself. Use of the

wrong type of battery can damage 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 5 (page

E-54) and when you have the battery replaced.

• Turn on the watch’s Power Saving function (page E-66) 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.

E-54

Level

Battery Power Indicator

(Charge Soon Alert)

Function Status

All functions enabled.

Illumination, beeper, and

Diving Mode access

disabled.

Except for timekeeping and

the CHG (charge) indicator,

all functions and display

indicators disabled.

All functions disabled.

Battery Power Indicator and Recover Indicator

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

rechargeable battery’s power.

Battery power

indicator

E-55

• At Level 5, all functions are disabled and settings return to their initial factory

defaults. Once the battery reaches Level 2 after falling to Level 5, reconfigure the

current time, date, and other settings.

• The watch’s Home City code setting will change automatically to TYO (Tokyo)

whenever the battery drops to Level 5.

•

Display indicators reappear as soon as the battery is charged from Level 5 to Level 2.

• Leaving the watch exposed to direct sunlight or some other very strong light source

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

than the actual battery level. The correct battery level should be indicated after a few

minutes.

E-56

• If you use the light or alarms a number of times during a

short period, all segments of the battery power indicator

flash and the following operations become temporarily

disabled as battery power recovers.

- Display illumination

- Alarm and hourly time signal

- Access to Diving Mode

After some time, the battery power indicator should stop

flashing to indicate that battery power is back to normal.

At this time the watch should return to normal operation.

• If the battery power indicator frequently flashes, it

means that battery power is low. Leave the watch in

bright light to allow it to charge.

E-57

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

E-58

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

5 minutes

24 minutes

48 minutes

8 hours

Charging Guide

The following table shows the amount of time the watch needs to be exposed to light

each day in order to generate enough power for normal daily operations.

• For details about the battery operating time and daily operating conditions, see the

“Power Supply” section of the Specifications (page E-75).

• Stable operation is promoted by frequent exposure to light.

E-59

Recovery Times

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

one level to the next.

Approximate Exposure Time

Level 5 Level 4 Level 3 Level 2 Level 1

2 hours 17 hours 5 hours

7 hours 84 hours 23 hours

13 hours 171 hours 46 hours

145 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)

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

times depend on lighting conditions.

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Casio 3185 - GF-1000 Manual

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