Casio 2931 Operation Manual

MA0509-EA
Keep your watch exposed to light!
Your watch runs on electrical power generated from light and stored by a rechargeable battery.
To ensure stable operation, make sure that the solar cell of the watch is exposed to light as much as possible.
1.
How the solar cell and battery work
When exposed to light
Light
Solar cell
Electrical energy
Charge
Rechargea-
ble battery
Power supplied to watch
When not exposed to light
Discharge
Rechargea-
ble battery
Power supplied to watch
Your watch continues to operate, even when it is not exposed to
light. Leaving the watch in the dark can run down its battery and
cause functions to become disabled.
Modes and Display Screens
Each press of the C C C C C button sounds a confirmation tone and cycles through available modes in the sequence shown below.
• The watch will revert to the Timekeeping Mode automatically if you leave it in the Tide/Moon Graph Mode or Alarm Mode for about two or
three minutes without performing any operation.
Timekeeping Mode
Graphic Area
Day of the Week
(Light)
(Display switching)
button button
Month, Day
Moon Graph
Receive
indicator Battery
Indicator
button button
(Mode switching)
PM indicator
Hour, Minute, Second
(no display for AM)
• For details about the Moon Graph, see "Using the Moon
Graph (Moon Phase)".
• For details about the battery indicator, see "Battery
Indicator".
• For details about the receive indicator, see "Receive
Indicator".
• Elements in the graphic area appear and disappear to
indicate the passage of seconds.
Operation Guide 2931
2.
Avoid overuse of display illumination.
• Over use of display illumination can run down the battery.
Discharge
Rechargea-
ble battery
Power supplied to watch
The following shows approximately how much exposure to light is
required to recharge the battery by the amount used by one
display illumination operation.
• Sunlight through a window: 5 minutes
• Indoor fluorescent lighting: 50 minutes
Care is required when using the full auto light switch, which
can cause frequent display illumination.
Switching between Display Screens
Each press of the cycles screen contents as shown below.
Temperature Tide Graph
• For information about temperature sensor calibration, see
"Setting the Home City Time and Date".
• For information about the Tide Graph, see "Using the Tide Graph".
Temperature Measurements
While the temperature screen is displayed, the watch takes
temperature measurements every two minutes.
• When measuring outdoor temperatures, remove the watch
from your wrist and place it in a location where its readings will
not be affected by body temperature, sweat (water droplets),
direct sunlight, etc.
• After removing the watch from your wrist, it takes about 20 to
30 minutes before the temperature of the watch becomes the
same as the outside temperature.
• When you enter the Timekeeping
Mode from the Alarm Mode, the area
name (see the "Area List") appears
first. After a short while, the display
changes to the date display.
3.
Tips on how to keep the battery charged.
• Try to ensure that the watch is always exposed to enough light to
keep its battery indicator at LEVEL 1 or LEVEL 2. Some of the
watch's functions are disabled when battery power drops to
LEVEL 3.
Light
Battery Indicator
Level 1
All functions
enabled
Level 2
Some
Level 3
Rechargea-
functions
ble battery
Level 4 disabled
• Whenever you are not wearing the watch on your wrist, position it
so the face (solar cell) is pointed in the direction of a source of
bright light.
Solar Cell
Light
Leave the watch under
fluorescent lighting, near a
window, etc.
Tide/Moon Graph Mode
Mode Name Year
Month, Day PM indicator
(A for AM)
Alarm Mode
Alarm Number
Alarm Time
• When wearing the watch, try to keep your sleeve from blocking its
face (solar cell).
Charging efficiency is significantly
reduced even if the face of the
watch is only partially covered by
your sleeve.
Timer Mode
Tide Graph Mode Name
Moon Graph
Timer Time
World Time Mode Stopwatch Mode
City Code
Mode Name
World Time
Time
1