Casio 3281 Manual De Usuario

Operation Guide 3261 3281

The face of the watch is a solar cell that generates power from light. The generated 
power charges a built-in rechargeable battery, which powers watch operations. The 
watch charges whenever it is exposed to light.

Whenever you are not 
wearing the watch, leave it in 
a location where it is exposed 
to light.

•

 Best charging performance 

is achieved by exposing the 
watch to the strongest light 
available.

When wearing the watch, 
make sure that its face is not 
blocked from light by the 
sleeve of your clothing.

•

 The watch may enter a 

sleep state (page E-18) if its 
face is blocked by your 
sleeve even only partially.

•

 On the dashboard of a car parked in direct sunlight

•

 Too close to an incandescent lamp

•

 Under direct sunlight

•

 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.

•

 Turn on the watch’s Power Saving function (page E-18) and keep it in an area 

normally exposed to bright light when storing it for long periods. This helps to 
ensure that power does not run down.

•

 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 power to run down. 
Expose the watch to bright light whenever possible.

Power Levels
You can get an idea of the watch’s power level by observing the battery power 
indicator on the display.

1

(H)

All functions enabled.

2

(M)

All functions enabled.

3

(L)

Illumination, beeper, and sensor 
operation disabled.

4

(C)

Except for the CHG (charge) 
indicator, all functions and display 
indicators disabled.

5

All functions disabled.

•

 The flashing LOW indicator at Level 3 (L) 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 or Level 5, all functions are disabled and settings return to their initial 

factory defaults. Once the battery reaches Level 2 (M) after falling to Level 4 or 
Level 5, reconfigure the current time, date, and other settings.

•

 If charging starts from Level 5, CHG will start flashing on the display when Level 4 

is reached. Note, however, that watch functions are not restored at this time. Leave 
the watch exposed to sufficiently strong light until the battery level reaches Level 2 
or Level 1 before using it.

•

 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.

•

 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 or 
Level 5, and when you have the battery replaced.

•

 Performing multiple sensor, illumination, or beeper operations during a short period 

may cause all of the battery power indicators (H, M, and L) to start flashing on the 
display. This indicates that the watch is in the power recovery mode. Illumination, 
alarm, countdown timer alarm, hourly time signal, and sensor operations will be 
disabled until battery power recovers.

•

 Battery power will recover in about 15 minutes. At this time, the battery power 

indicators (H, M, L) will stop flashing. This indicates that the functions listed above 
are enabled again.

•

 If all of the battery power indicators (H, M, L) are flashing and the CHG (charge) 

indicator also is flashing, it means the battery level is very low. Expose the watch to 
bright light as soon as possible.

•

 Even if battery power is at Level 1 (H) or Level 2 (M), the Digital Compass/

Thermometer Mode sensor may be disabled if there is not enough voltage available 
to power it sufficiently. This is indicated when all of the battery power indicators (H,
M, L) are flashing.

•

 Frequent flashing of all of the battery power indicators (H, M, L) probably means 

that remaining battery power is low. Leave the watch in bright light to allow it to 
charge.

Outdoor sunlight 
(50,000 lux)

5 min.

2 hours

16 hours 5 hours

Sunlight through a window 
(10,000 lux)

24 min.

6 hours

79 hours 21 hours

Daylight through a window 
on a cloudy day (5,000 lux)

48 min.

12 hours

159 hours 43 hours

Indoor fluorescent lighting 
(500 lux)

8 hours

168 hours

– – –

– – –

•

 The above exposure times all are for reference only. Actual exposure times depend 

on lighting conditions.

•

 For details about the operating time and daily operating conditions, see the “Power 

Supply” section of the Specifications (page E-101).

Power Saving
When turned on, Power Saving enters a sleep state automatically whenever the watch 
is left for a certain period in an area where it is dark. The table below shows how 
watch functions are affected by Power Saving.

•

 There actually are two sleep state levels: “display sleep” and “function sleep”.

60 to 70 minutes 
(display sleep)

Blank, with PS flashing

Display is off, but all functions are 
enabled.

6 or 7 days 
(function sleep)

Blank, with PS not flashing

All functions are disabled, but 
timekeeping is maintained.

•

 The watch will not enter a sleep state between 6:00 AM and 9:59 PM. If the watch is 

already in a sleep state when 6:00 AM arrives, however, it will remain in the sleep 
state.

•

 The watch will not enter a sleep state while it is in the Stopwatch Mode or 

Countdown Timer Mode.

To recover from the sleep state
Move the watch to a well-lit area, press any button, or angle the watch towards your 
face for reading (page E-86).